Cambridge Air Solutions M Series Technical Manual Download

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Cambridge Air Solutions.

M-Series Technical Manual

OPERATING INSTRUCTIONS

BACNET CONTROLLER

The BACnet Controller is a native BACnet®, fully programmable, direct digital controller. It provides a

communication link between a BAS (Building Automation System) and the Cambridge heater. The controller

provides precise monitoring and control of connected points.

• BACnet

MS/TP compliant operating at up to 76.8 kilobaud

• BTL-certified controller

• Standard input points for fan status, burner status, discharge temperature, zone

temperature, outdoor temperature and unit lockout status

• Standard output points for fan control, burner control and discharge temperature control

• Selectable operating modes (unit heater / makeup air / summer ventilation)

• Removable screw terminal blocks

• Onboard USB port for firmware upgrades

• Local user interface display for commissioning and monitoring

POWER

FAULT

SA BUS

FC BUS

MODBUS

Summary of Contents for M Series

Page 1: ...d maintenance instructions thoroughly before installing or servicing this equipment FOR YOUR SAFETY The use and storage of gasoline or other flammable vapors and liquids in open containers in the vicinity of this appliance is hazardous FOR YOUR SAFETY If you smell gas 1 Open windows 2 Don t touch electrical switches 3 Extinguish any open flame 4 Immediately call your gas supplier Made in the USA 9...

Page 2: ...r Acknowledgement For questions regarding Limited Warranty contact Cambridge Air Solutions Customer Service Group at 1 800 473 4569 Copyright 2019 Cambridge Air Solutions All Rights Reserved Cambridge Air Solutions 760 Long Road Crossing Dr Chesterfield MO 63005 Phone 636 532 2233 800 899 1989 Fax 636 530 6133 www cambridgeair com ...

Page 3: ...l Mount Outdoor Stand Mount Configuration 15 Horizontal Mount Thru Wall Configuration 18 Vertical Mount Outdoor Configuration 21 Vertical Mount Indoor Configuration 25 Gas Piping 28 Electrical 29 START UP INSTRUCTIONS 30 VFD Start Up Instructions 37 OPERATING INSTRUCTIONS Operating Sequence 44 Electronic Thermostat 45 TSS Controller 47 BACnet Controller 56 MAINTENANCE INSTRUCTIONS Bearing Lubricat...

Page 4: ... Piping for Autodrain with Freeze Protection 70 Fill Valve Schematic 70 Electrical Panel Wiring 71 Media Cooling Pads Operating Installation 72 Munters CELdek 72 Initial Start Up 73 Procedure 73 Normal Operations 74 Sequence of Operations 74 Maintenance 74 Procedure 74 REFERENCE Heater Roof and Wall Openings 75 Heater Discharge Dimensions 75 Gas Train Drawings 76 Electrical Control Enclosure Isome...

Page 5: ...f Controls Operating Thermostat 84 Series 44 Temperature Setback System Temperature Averaging 85 Series 44 Tamperproof Controls Variable Frequency Drive Room Pressure 86 Connection Diagram 87 Gas Control Systems 88 Remote Control Station Components 89 Individual Heater Component Descriptions 91 Damper Motor Replacement Adjustment 95 Troubleshooting Guide 97 ANSI ASHRAE IESNA STANDARD 90 1 103 MAIN...

Page 6: ...ler room the heater is to be interlocked to open inlet air dampers or other such devices If the heater is installed such that an inlet duct is utilized the duct system must be purged with at least four air changes prior to an ignition attempt IMPORTANT Installation in Aircraft Hangars Refer to the Standard for Aircraft Hangars ANSI NFPA 409 for specific information on the installation requirements...

Page 7: ...he Remote Heat Adjust control face based on the setting of the override temperature dial which is visible from the top of the control MAXITROL SERIES 44 The Maxitrol Series 44 modulation controls maintain a constant space temperature by increasing or decreasing the discharge temperature The Space Temperature Selector is set to maintain the space temperature of the heated space by controlling the h...

Page 8: ...S UNIT DP Vertical Mount Indoor Configuration Vertical Mount Outdoor Configuration DD Discharge Duct DE Discharge Elbow DP Discharge Plenum DRH Dual Rainhood w Inlet Screen Filter Rack FS Filter Section V Bank FSID V Bank Filter Section Inlet Damper Combo HBDD Horizontal Blast Discharge Diffuser IC Inlet Collar IE Inlet Elbow MC Mounting Curb MDD Motorized Discharge Damper MID Motorized Inlet Damp...

Page 9: ... 72 70 85 95 125 150 180 220 250 280 Discharge Damper internal N A N A N A 30 30 35 45 55 75 Discharge Plenum 4 way 100 150 200 250 300 400 470 930 1480 Discharge Plenum 3 way 80 130 175 220 260 360 430 500 795 Discharge Splash Pan 40 40 40 60 60 60 80 80 80 Curb 14 60 70 80 100 120 180 210 230 270 Curb 24 100 120 140 170 200 270 310 340 445 Model M118 M120 M125 M130 M136 Base Heater 1800 2300 290...

Page 10: ...th mechanical exhaust fans manually operated switches programmable timers or other process control systems The discharge temperature of heaters with fixed discharge temperature controls is typically set 10 F to 20 F above the desired space temperature The entering air thermostat acts as an economizer by deactivating burner operation during mild weather TYPICAL SYSTEM OVERVIEW HEATER OPERATION MANU...

Page 11: ...bution pattern of the heater If upon review of the proposed installation a problem is discovered which may be considered detrimental to the performance of the heater or restricts its serviceability or deviates from the instructions or drawings which may be provided it is the responsibility of the installer to communicate that information to the person or persons responsible for providing the insta...

Page 12: ...T PENETRATE UNIT BASE OR MOUNTING CURB PITCH POCKETS OR ROOF BOOTS BY OTHERS RECOMMENDED INSTALLATION INSTRUCTIONS HORIZONTAL ROOF MOUNT MOUNTING CURB M110 M136 Shown for Roof Top Configuration Downblast Application Model A B C M110 30 26 7 8 48 M112 30 26 7 8 48 M115 30 41 1 8 60 M118 31 48 5 8 60 M120 31 54 5 8 72 M125 31 66 5 8 84 M130 37 3 8 88 3 8 96 M136 37 88 3 8 96 M140 N A N A N A Note Th...

Page 13: ...mensions for your specific heater The gas and electrical connections must not penetrate the unit base or mounting curb Cambridge Air Solutions recommends using pitch pockets or roof boots to seal the penetrations IMPORTANT Accurate measurements are critical and will affect installation process 2 Assemble and secure the roof curb to the support structure per the recommendations of the structural en...

Page 14: ...al Manual TYPICAL INSTALLATION HORIZONTAL MOUNT ROOF TOP CONFIGURATION M110 M115 Typical Curb and Discharge Duct Model W L M110 17 17 M112 19 19 M115 22 22 Roof Opening Typical Curb and Discharge Duct DIMENSIONS ALLOW FOR CLEARANCE ON EACH SIDE ...

Page 15: ...GE PLENUM MOUNTING CURB REMOTE CONTROL STATION BURNER VIEWPORT CONTROL WIRING BY OTHERS INCOMING POWER BY OTHERS SEDIMENT TRAP BY OTHERS HIGH PRESSURE REGULATOR HPR HIGH PRESSURE SUPPLY TAP HIGH PRESSURE SHUT OFF VALVE VENT WITH SCREEN LOCATE MIN 10FT FROM INTAKE HPR OPTION ELECTRICAL GAS CONTROL ENCLOSURE HANGER BRACKET VENT PIPE BY OTHERS RAINHOODS DISCHARGE DUCT MOUNTING CURB TYPICAL INSTALLATI...

Page 16: ...Solutions 14 M Series Technical Manual Typical Curb and Discharge Duct Model W L M140 55 55 Roof Opening TYPICAL INSTALLATION HORIZONTAL MOUNT ROOF TOP CONFIGURATION M140 DIMENSIONS ALLOW FOR 1 CLEARANCE ON EACH SIDE ...

Page 17: ...should be installed such that the heater will sit level 3 Use a crane or comparable lifting device to raise and position the equipment Use a spreader bar to prevent damage and connect slings to the lifting brackets IMPORTANT Cambridge Air Solutions recommends mounting the heater a minimum of 24 off the mounting surface in areas where snow accumulation could impact heater operation 4 Caulk all join...

Page 18: ...STALLATION HORIZONTAL MOUNT OUTDOOR STAND MOUNT CONFIGURATION M118 M136 Typical Duct Interface Model W L M118 26 26 M120 30 30 M125 36 36 M130 43 43 M136 49 49 Wall Opening DIMENSIONS ALLOW FOR 1 CLEARANCE ON EACH SIDE DIMENSIONS ALLOW FOR 2 CLEARANCE ON EACH SIDE ...

Page 19: ...cal Manual 17 Cambridge Air Solutions TYPICAL INSTALLATION HORIZONTAL MOUNT OUTDOOR STAND MOUNT CONFIGURATION M140 Model W L M140 56 56 Wall Opening Typical Duct Interface DIMENSIONS ALLOW FOR 2 CLEARANCE ON EACH SIDE ...

Page 20: ...y Use a spreader bar to prevent damage and connect slings to the lifting brackets IMPORTANT Cambridge Air Solutions recommends mounting the heater s rainhood a minimum of 24 off the ground or other surfaces 4 Apply washers and double lock nuts to secure equipment on hanging rods Note The discharge end of the heater should be raised slightly 1 8 above level to allow ingested moisture to drain from ...

Page 21: ...hnical Manual 19 Cambridge Air Solutions TYPICAL INSTALLATION HORIZONTAL MOUNT THRU WALL CONFIGURATION M110 M115 Model W H M110 32 35 M112 32 35 M115 46 35 Wall Opening DIMENSIONS ALLOW FOR 1 CLEARANCE ON EACH SIDE ...

Page 22: ... TYPICAL INSTALLATION HORIZONTAL MOUNT THRU WALL CONFIGURATION M118 M136 Model W H M118 51 55 M120 57 55 M125 69 72 M130 92 73 M136 92 98 M140 121 97 Wall Opening DIMENSIONS ALLOW FOR 1 CLEARANCE ON EACH SIDE DIMENSIONS ALLOW FOR 2 CLEARANCE ON EACH SIDE ...

Page 23: ...revent damage and connect slings to the lifting eyes The Vertical Mount heaters may be shipped in sections due to shipping constraints Review the Accessory Identification drawings see page 4 to identify the locations of these sections IMPORTANT Cambridge Air Solutions recommends mounting the heater a minimum of 60 off the mounting surface in areas where snow accumulation could impact the heater op...

Page 24: ...ling supports to the plenum s support brackets 12 For M136 Inlet Elbow and Rain Hoods assembly see field assembly instructions provided with components 13 Mounting Leg and Filter Section Inlet Damper Combo attachment instructions are provided with components 14 Adjust internal vibration isolation if applicable per the setup instructions provided with this manual DETAIL A DETAIL B Note If supplied ...

Page 25: ...TYPICAL INSTALLATION VERTICAL MOUNT OUTDOOR CONFIGURATION HORIZONTAL BLAST M118 M136 Model W H M118 26 26 M120 30 30 M125 36 36 M130 43 43 M136 49 49 Wall Opening DIMENSIONS ALLOW FOR 1 CLEARANCE ON EACH SIDE DIMENSIONS ALLOW FOR 2 CLEARANCE ON EACH SIDE ...

Page 26: ...ual Model W H M118 26 26 M120 30 30 M125 36 36 M130 43 43 M136 49 49 Wall Opening TYPICAL INSTALLATION VERTICAL MOUNT OUTDOOR CONFIGURATION UP BLAST M118 M136 DIMENSIONS ALLOW FOR 1 CLEARANCE ON EACH SIDE DIMENSIONS ALLOW FOR 2 CLEARANCE ON EACH SIDE ...

Page 27: ... these sections IMPORTANT Cambridge Air Solutions recommends mounting the heater s rain hood a minimum of 60 off the ground or other surfaces in areas where snow accumulation could impact operation 4 Attach each Mounting Leg to the inlet elbow using the 1 2 13 x 1 1 2 bolts The bolts install downward through a clearance hole in the accessory into a threaded insert in the Mounting Leg Install all f...

Page 28: ... the entire width of the collar Caulk all other exposed joints 11 Install the discharge accessory by screwing the accessory to the heater Install hanging rods from the ceiling supports to the accessory s support brackets 12 For drain trough installation see the field installation detail provided with the component 13 For M140 installations see the field assembly drawings provided with the componen...

Page 29: ...Model W H M118 51 56 M120 57 56 M125 69 72 M130 92 73 M136 104 83 Wall Opening TYPICAL INSTALLATION VERTICAL MOUNT INDOOR CONFIGURATION HORIZONTAL BLAST M118 M136 DIMENSIONS ALLOW FOR 1 CLEARANCE ON EACH SIDE DIMENSIONS ALLOW FOR 2 CLEARANCE ON EACH SIDE ...

Page 30: ...that the gas piping when installed will not restrict or block the access door from fully opening 5 Install gas piping to the make up air heater in accordance with local codes or in their absence in accordance with the National Fuel Gas Code NFPA 54 ANSI Standard Z223 1 or the CAN CGA B149 Installation Codes IMPORTANT A 1 8 NPT tap is supplied with the heater for measuring the gas supply pressure T...

Page 31: ...he door is closed and may not adequately sense the temperature when the door is open In dock areas the sensor should be located on the first column in from the outside wall IMPORTANT Observe the special notes and instructions on the wiring diagrams including the following The wiring for the space temperature sensors must be shielded twisted pair wiring and must be run separately from the other lin...

Page 32: ...IPMENT a Check for any physical damage from shipping or installation that could render the heater inoperable b Verify all heater accessories and filters if applicable have been properly installed c Check for loose components belts plugs terminal screws etc d Verify the access doors and controls enclosure are free from obstructions such that they can be fully opened e Verify the field wiring both p...

Page 33: ... Then turn the blower service switch to the OFF position and verify the blower is rotating in the proper direction See the directional arrow on the blower housing IMPORTANT On a three phase system the rotation direction of the blower may be reversed by switching any two wires located on the downstream side of the service disconnect The electrical supply to the heater must be turned off prior to sw...

Page 34: ...for this test a Check the motor current at the overload relay on all three legs b Turn the blower service switch to the OFF position IMPORTANT The average amps must not exceed the motor nameplate FLA High amperage may indicate excessive blower RPM Call the Cambridge Air Solutions Customer Service Group at 800 473 4569 if unable to obtain acceptable amperage readings 7 CALCULATING AND ADJUSTING BUR...

Page 35: ...ight j Observe the manometer reading and compare to the Calculated Manifold Pressure above If the manifold pressure reading does not equal this value adjust the manifold pressure regulator until the proper manifold pressure is obtained See page 76 for gas train drawings IMPORTANT The pressure drop across the burner profile damper that was adjusted in Step 5 page 31 must not fall below 0 51 inches ...

Page 36: ...With the burner operating spray the complete gas train with leak detector solution checking all pipe connections and plugs c Turn the blower and burner service switches to the OFF position WARNING Do not use flame to leak check piping WARNING Any gas leak detected must be repaired before the make up air heater is placed into service 10 MINIMUM FIRE SETTING IMPORTANT All access doors must be closed...

Page 37: ...ive initial firing rate that equates to the following for most burner applications 20 F to 30 F temperature rise 0 10 to 0 30 inches WC manifold differential pressure above blower pressure Voltage to the modulating valve of 9 to 11 Volts DC for the Maxitrol M511 or M611 valve and 10 to 13 Volts DC for the Maxitrol MR212 valve Flame length of 3 to 5 The Low Fire Start function lasts for 15 seconds ...

Page 38: ...ble turn the Remote Control Station mode selector switch to the HEATING position c 1 If the Remote Control Station utilizes a thermostat refer to the Operating Instructions for the Electronic Thermostat page 45 or the TSS Controller page 47 to set the thermostat at its highest setting c 2 If another device in the Remote Control Station controls the operation of the heater activate this device c 3 ...

Page 39: ...ff cock is installed external to the heater and downstream of the high pressure regulator if applicable i Verify that the gas piping unions are tight j Verify that the burner union is tight 2 ELECTRICAL SUPPLY VOLTAGE VERIFICATION For model M110 M115 heaters remove electrical control enclosure access door and check the electrical supply voltage at the terminal block which is adjacent to the discon...

Page 40: ...g 60 Hz on the display If the Hz are not at 60 press the UP arrow on the VFD keypad until the Hz reach 60 Verify the pressure reading on the photohelic gauge black needle is between the two orange needles Verify the photohelic settings orange needles comply with the settings below Profile Plate Pressure Drop Blower Only inches WC Natural Gas The left orange needle on the photohelic should be set t...

Page 41: ... Service Group at 1 800 473 4569 If the low speed pressure measured on the photohelic is too low the low speed airflow is inadequate and may cause equipment resets or burner short cycling 8 LOW FIRE START ADJUSTMENT The Low Fire Start control setting is preset at the factory to provide a fixed repetitive initial firing rate that equates to the following for most burner applications 20 F to 30 F te...

Page 42: ...l Pressure ___________ WC Manifold Static Pressure Blower Only ___________ WC Should Be A Negative Pressure Calculated Manifold Pressure ___________ WC NOTE A negative manifold static pressure blower only will cause the calculated manifold pressure reading to be lower than the nameplate manifold differential pressure IMPORTANT The high limit may trip on warm or mild temperature days A jumper acros...

Page 43: ...equal this value adjust the low speed kit LSK until the proper manifold pressure is obtained The LSK is a resistor that limits the voltage from the amplifier to the modulating valve If adjustment is required the LSK adjustment screw is located on the LSK under the brass cylindrical cap as shown in the drawing below Remove the cap make the necessary adjustment and replace the cap Only minor adjustm...

Page 44: ... rated less than 400 000 Btu hr close the manual burner shut off valve and wait 30 seconds to read the manometer If the reading is greater than 0 inch WC replace the gas valve and retest If the reading is 0 inch WC remove the manometer and reinstall the pipe plug b 2 On heaters with separate redundant valves close the manual burner shutoff valve hold the momentary leak test switch in the closed po...

Page 45: ... Verify the blower operates 15 FINAL HEATER PREPARATION a Turn the disconnect switch off NOTE Be sure to wait 3 minutes before re energizing a VFD once the disconnect is turned to the OFF position Re energizing a VFD before an off time of three minutes could result in a VFD failure b Set the Entering Air Thermostat EAT to the specified temperature setting Refer to the Individual Component Descript...

Page 46: ... to run until turned off HEATING MODE 1 Mode switch in HEATING position 2 Thermostat or interlock calls for heat 3 Optional motorized inlet or discharge damper opens 4 Blower motor starts 5 Low airflow switch closes 6 Entering air thermostat closes when inlet temperature is below setpoint after the prepurge delay 7 Igniter warm up timing 8 Gas valve opens 9 Burner lights 10 Igniter is de energized...

Page 47: ...output relay Separate settings for HEAT ON and HEAT OFF settings Temperature Calibration for accurate temperature control EEPROM storage maintains temperature settings indefinitely in case of power loss The thermistor enclosure SH 1 is packed inside the Remote Control Station for shipment It can be mounted on the exterior sides or bottom of the Remote Control Station or a remote location within 50...

Page 48: ...l the desired temperature for the heater to turn ON is displayed 2 Press and hold the HEAT OFF button while pressing the UP or the DOWN button until the desired temperature for the heater to turn OFF is displayed TEMPERATURE CALIBRATION To compensate for lead wire resistance it may be necessary to make an adjustment to the displayed temperature to correct it to the temperature measured at the ther...

Page 49: ...ic adjustment for Daylight Saving Time Nine Holiday Setback Periods for temporary setback operation Temperature Calibration for accurate temperature control Capacitor backup maintains current time and day of week for power loss of up to 96 hours EEPROM storage maintains schedules and temperature settings indefinitely The thermistor enclosure SH 1 is packed inside the Remote Control Station for shi...

Page 50: ... the DAY OF WEEK button while pressing the UP or the DOWN button until the light for the current day is illuminated 2 Press and hold the TIME button while pressing the UP or the DOWN button until the current time is displayed 3 Press and hold the MONTH DAY button while pressing the UP or the DOWN button until the current date is displayed 4 Press and hold the YEAR button while pressing the UP or t...

Page 51: ...he OFF time schedule is in effect See SETTING SCHEDULES for instructions on setting the ON and OFF schedules With the keyswitch in the SUMMER VENTILATION position the heater fan will run based on the time schedule with no temperature control HEATING MODE ON Time Schedule The HEATING mode requires two temperature settings When the temperature drops below the HEAT ON setting the heater will turn on ...

Page 52: ...y the VENT MODE light on the TSS Controller being illuminated Before attempting to program the schedule determine the planned time periods for HEAT ON and SETBACK OFF for the HEATING mode and the planned ON and OFF time periods for the Ventilation mode The time that it takes to recover from the SETBACK temperature to the HEAT temperature must also be taken into consideration for the ON time in the...

Page 53: ...4 On 5 Off 5 On 6 Off 6 On 7 Off 7 On 8 Off 8 On 9 Off 9 On 10 Off 10 On 11 Off 11 On 12 Off 12 On 13 Off 13 On 14 Off 14 SUMMER VENTILATION SCHEDULE Cycle Time AM PM Day On M F Off M F On 1 Off 1 On 2 Off 2 On 3 Off 3 On 4 Off 4 On 5 Off 5 On 6 Off 6 On 7 Off 7 On 8 Off 8 On 9 Off 9 On 10 Off 10 On 11 Off 11 On 12 Off 12 On 13 Off 13 On 14 Off 14 ...

Page 54: ...s and bold the TIME button while pressing the UP or the DOWN button to scroll to the desired OFF time for Monday through Friday 6 If Monday through Friday is the only schedule required proceed to Step 14 If any additional programming is required proceed with the following steps Remember that subsequent program cycles must not overlap with the ON and OFF times set above 7 Press the UP button once t...

Page 55: ...red program cycles have been entered 14 Press the SETBACK SCHEDULE EXIT button to exit the scheduling program 15 Verify that the correct current time and light for day of the week are still displayed HOLIDAY SETBACK SCHEDULE The Holiday Setback Schedule overrides the normal schedule and holds the space at the SETBACK temperature The TSS Controller allows up to nine holiday periods Holiday Start Da...

Page 56: ...the UP or the DOWN button to scroll to the desired holiday start date 4 Press the UP button once to step to the first holiday end date cycle HEd1 5 Press and hold the MONTH DAY button while pressing the UP or the DOWN button to scroll to the desired holiday end date NOTE Holiday end date must be at least one day after holiday start date 6 Repeat steps 2 5 until all required holiday cycles have bee...

Page 57: ...lows the displayed temperature to be offset either above or below the actual sensed temperature Be sure to use an accurate temperature meter for making this correction 1 Press and hold the HEAT ON and HEAT OFF buttons while pressing the UP or the DOWN button until the correct temperature is displayed A period after the F will indicate the Calibration Mode 2 Pressing the UP or the DOWN button will ...

Page 58: ...d points BACnet MS TP compliant operating at up to 76 8 kilobaud BTL certified controller Standard input points for fan status burner status discharge temperature zone temperature outdoor temperature and unit lockout status Standard output points for fan control burner control and discharge temperature control Selectable operating modes unit heater makeup air summer ventilation Removable screw ter...

Page 59: ...nals BLU WHT WHT FIG_EOLT_WRNG BLK BLU REF WHT Isolate and insulate the REF lead when connecting the EOL to third party devices with only and terminals 24V FC Bus NETWORK PARAMETERS Before operating controllers on a bus you must set a valid and unique device address for each controller on the bus through the local display or MAP gateway Device addresses 4 through 127 are the valid addresses for th...

Page 60: ...d Burner start 2 Discharge Temperature modulates to Discharge Set Point based on PID loop 3 If Zone Temperature is above Zone Set Point plus Differential then Supply Fan and Burner stop 4 Burner will not operate if Outdoor Temperature is above Heating Lockout Set Point SUMMER VENTILATION MODE 1 If Zone Temperature AI8 is above Zone Set Point AV4 then Supply Fan BO1 starts 2 If Zone Temperature AI8...

Page 61: ... No Faults On Steady Device Fault no application loaded Main Code download required if controller is in Boot mode or a firmware mismatch exists between the PEAK controllers and the ZRF1811 Wireless Field Bus Router Blink 2 Hz Download or Startup in progress not ready for normal operation SA Bus Green Blink 2 Hz Blink 2 Hz Data Transmission normal communication Off Steady No Data Transmission Auto ...

Page 62: ...ntinuous Operation Standard Service 2 years 1 year Seasonal Service Motor is idle for 6 months or more 1 year 1 year Continuous Operation Severe Service High ambient dirty or moist location high vibration 6 months 6 months BELT TENSIONING Using a Browning Belt Tension Checker and a straight edge verify proper belt tension exists according to the following table Periodic belt adjustments may be req...

Page 63: ...xidation 5 Remove the fasteners that secure the burner to the housing The burner will then be free to slide out CAUTION Be sure to take necessary safety precautions such as wearing eye protection etc before attempting this step 6 Clean the burner by back flushing using high pressure air 40 80 PSI Continue back flushing until dust particles are completely expelled from the burner 7 Re install the b...

Page 64: ...assembly and the diaphragm assembly when lubricating the pilot disc 6 Replace the body gasket and the core diaphragm sub assembly with the closing spring attached Locate the bleed hole in the core diaphragm sub assembly approximately 30 CCW from the valve inlet 7 Replace the valve bonnet and the bonnet screws 6 Torque the screws in a crisscross manner to 100 10 in lbs Replace the solenoid and make...

Page 65: ...idge Air Solutions BONNET SCREW Indicates parts supplied in ASCO Rebuild Kit CAUTION Do not damage valve seat Locate bleed hole in core diaphragm sub assembly approximately 30 from valve inlet BLEED HOLE Disassembled View of ASCO Valve ...

Page 66: ...gainst the filter tracks These filters are unaffected by moisture and may be installed in the rainhoods or in the V bank filter section CLEANING AND REPLACEMENT Shut down the heater and turn off the blower before servicing the filters Remove the filters from the rainhood or filter section Handle carefully to prevent debris from being dislodged from the filter into the heater Permanent filters can ...

Page 67: ... Lower 4 2 4 2x2 2 1x2 M125 Upper 12 12 4x3 Lower 8 8 4x2 M130 Upper 12 4 12 3x4 4 1x4 Lower 9 3 9 3x3 3 1x3 M136 Upper 15 5 15 3x5 5 1x5 Lower 12 4 12 3x4 4 1x4 M140 Upper 5 25 5 1x5 25 5x5 Lower 4 20 4 1x4 20 5x4 Filter Section M110 3 3 3x1 M112 3 3 3x1 M115 6 6 3x2 M118 8 8 4x2 M120 10 10 5x2 M125 20 20 5x4 M130 24 24 6x4 M136 28 28 7x4 M140 56 56 8x7 Filter Type Permanent or Disposable Panel C...

Page 68: ...t could result in equipment or property damage or provides important information on installation considerations WARNING Proper Field Wiring and Grounding Required All field wiring MUST be performed by qualified personnel Ensure all field wiring and grounding is accomplished in full accordance with National Electrical Code NEC and local state electrical codes Failure to do so may pose FIRE or ELECT...

Page 69: ...oss members and minimize deflection of unit base frame to no more than 1 16th 1 6mm over the length and width of unit WARNING To prevent injury or death disconnect electrical power source before completing connection to the unit All wiring must comply with National Electrical Code NEC and state and local requirements Outside the United States the national and or local electrical requirements of ot...

Page 70: ... Drain with Freeze Protection Optional Install two way drain valve supplied by Cambridge Air Solutions as an option and installed by Contractor on the sump s drain connection Install three way fill valve supplied by Cambridge Air Solutions as an option and installed by Contractor under the roof line with port AB piped to the make up water connection from the sump Port A is piped to city water supp...

Page 71: ...NAL TO UNIT ARE TO BE FURNISHED AND INSTALLED BY OTHERS UNLESS OTHERWISE INDICATED S SUPPLIED BY CAMBRIDGE AIR SOLUTIONS S SUPPLIED BY CAMBRIDGE AIR SOLUTIONS C SUPPLIED BY CONTRACTOR C SUPPLIED BY CONTRACTOR PROVIDED BY INSTALLER FLOAT VALVE BY CAMBRIDGE AIR SOLUTIONS PROVIDED BY INSTALLER FLOAT VALVE BY CAMBRIDGE AIR SOLUTIONS VALVE SUPPLIED BY VALVE SUPPLIED BY CAMBRIDGE ENGINEERING OPTIONAL CA...

Page 72: ... VALVE 3 WAY VALVE DRAIN OVERFLOW 1 DRAIN WATER SUPPLY LINE VIEW Scale None A A Evap Pump Bleed Tube Manifold Supply Tube Service Valve by others Pressure Regulator by others Three Way Drain Fill Valve Water Supply Refer to manual pressure guide End B End A Roof Line UNIT MUST BE LEVEL A A Two Way Drain Valve Normally Open End A End B 1 Drain Drain Overflow All wiring must comply with local and na...

Page 73: ... the Electrical Control Enclosure for termination in the field Factory supplied power and control wiring are to be field connected to the terminal strip located in the J box mounted on the DEC NOTE Power supplied and installed by others All installations should be performed in accordance to local and state codes and with proper permits Wire unit according to approved submittals and wiring diagram ...

Page 74: ...EDIA COOLING PADS OPERATING INSTALLATION NOTE SEE ADDITIONAL INFORMATION ON CARE OF MUNTERS MEDIA IN SUPPLEMENTAL INFORMATION 10 MEDIA COOLING PADS OPERATING INST ALLATION NOTE See additional information on care of Munters media in Supplemental Information ...

Page 75: ...ing carried over into the airstream from the media pads or sump Check fan rotation Cycle damper actuators to ensure they open and close freely If there is water carryover from the media pads perform the following procedure 13 Check for proper positioning of media pads the sides of pads are arrows marking the direction or air flow If media pads are correctly positioned then check for air bypassing ...

Page 76: ...o prevent algae and scale formation on the media pads MAINTENANCE Procedure Spring Start Up 1 Clean sump tank and sump pump 2 Remove distribution header and clean out distribution holes that supply water flow to media pads 3 Inspect all wire connections for discolored and or burned wires Replace where necessary 4 Inspect media pads and replace per manufacturer s recommendations 5 Follow Initial St...

Page 77: ...7 8 20 20 M118 21 7 8 18 23 23 M120 24 24 27 27 M125 31 31 33 33 M130 36 5 8 36 5 8 39 39 M136 42 42 45 45 M140 50 50 52 52 HEATER DISCHARGE DIMENSIONS Wall Opening Discharge Inlet Model W H W H M118 26 26 51 56 M120 30 30 57 56 M125 36 36 69 72 M130 43 43 92 73 M136 49 49 104 83 Horizontal Mount Vertical Mount DIMENSIONS ALLOW FOR CLEARANCE ON EACH SIDE DIMENSIONS ALLOW FOR 1 CLEARANCE ON EACH SI...

Page 78: ...RAWINGS Horizontal Mount 400 MBH CSA Certified Vertical Mount 400 MBH Low Pressure CSA Certified Horizontal Mount 400 MBH High Pressure CSA Certified ELECTRIC SHUT OFF VALVE SOV ELECTRIC SAFETY SHUT OFF VALVE SSV ELECTRIC SHUT OFF VALVE SOV ELECTRIC SAFETY SHUT OFF VALVE SSV ...

Page 79: ...ertical Mount 2500 MBH Factory Mutual FM Compliant CSA Certified ELECTRIC SHUT OFF VALVE SOV ELECTRIC SAFETY SHUT OFF VALVE SSV Horizontal Mount 400 MBH XL GAPS Compliant formerly Industrial Risk Insurers IRI CSA Certified ELECTRIC SHUT OFF VALVE SOV ELECTRIC SAFETY SHUT OFF VALVE SSV ...

Page 80: ...Cambridge Air Solutions 78 M Series Technical Manual REFERENCE ELECTRICAL CONTROL ENCLOSURE ISOMETRIC DRAWING M110 M115 ...

Page 81: ...M Series Technical Manual 79 Cambridge Air Solutions REFERENCE ELECTRICAL CONTROL ENCLOSURE ISOMETRIC DRAWING M118 M136 ...

Page 82: ...Cambridge Air Solutions 80 M Series Technical Manual ELECTRICAL CONTROL ENCLOSURE ISOMETRIC DRAWING M140 ...

Page 83: ...me Safeguard Relay SYMBOL DESCRIPTION FU1 Fuse 24 Volt Control FU2 Fuse 120 Volt Control HGP High Gas Pressure Switch HL High Limit IG Igniter L1 Light Alarm L2 Light Fan L3 Light Heat LFS Low Fire Start LTC Low Temperature Cutout M Motor MS Motor Starter MV Modulating Valve SYMBOL DESCRIPTION OL Overload Relay PT Purge Timer RA Remote Adjust R1A R1B Relay Gas Valve SOV Shut Off Valve Gas SSV Safe...

Page 84: ...U1 Fuse 24 Volt Control FU2 Fuse 120 Volt Control HL High Limit IG Igniter L1 Light Alarm L2 Light Fan L3 Light Heat LFS Low Fire Start LTC Low Temperature Cutout M Motor Supply Fan MS1 Motor Starter Supply Fan MS2 Motor Starter Exhaust Fan MV Modulating Valve SYMBOL DESCRIPTION OL1 Overload Relay Supply Fan OL2 Overload Relay Exhaust Fan PT Purge Timer RA Remote Heat Adjust R1A R1B Relay Gas Valv...

Page 85: ...SCRIPTION FU2 Fuse 120 Volt Control HGP High Gas Pressure Switch HL High Limit IG Igniter L1 Light Alarm L2 Light Fan L3 Light Heat LFS Low Fire Start LTC Low Temperature Cutout M Motor MS Motor Starter MV Modulating Valve OL Overload Relay SYMBOL DESCRIPTION PT Purge Timer R1A R1B Relay Gas Valve RC Resistor Calibration SOV Shut Off Valve Gas SSV Safety Shut Off Valve Gas STS Space Temperature Se...

Page 86: ...iter L1 Light Alarm L2 Light Fan L3 Light Heat LFS Low Fire Start LTC Low Temperature Cutout M Motor MS Motor Starter MV Modulating Valve OET Operating Electronic Thermostat OL Overload Relay PT Purge Timer R1A R1B Relay Gas Valve R2 Relay Intermittent Continuous SYMBOL DESCRIPTION RC Resistor Calibration RTS Remote Temperature Sensor SOV Shut Off Valve Gas SSV Safety Shut Off Valve Gas STS Space ...

Page 87: ... Heat LFS Low Fire Start LTC Low Temperature Cutout M Motor MS Motor Starter MV Modulating Valve OTS Override Timer Switch OL Overload Relay PT Purge Timer R1A R1B Relay Gas Valve SYMBOL DESCRIPTION R2 Relay Intermittent Continuous RC Resistor Calibration RTS Remote Temperature Sensor SOV Shut Off Valve Gas SSV Safety Shut Off Valve Gas STS Space Temperature Selector SW1 Service Switch Fan SW2 Ser...

Page 88: ...t Alarm L2 Light Fan L3 Light Heat LFS Low Fire Start LPR Relay Low Pressure LSK Low Speed Kit LSR Relay Low Speed LTC Low Temperature Cutout M Motor MV Modulating Valve PDA Profile Damper Adjustment PDM Profile Damper Motor PT Purge Timer SYMBOL DESCRIPTION PXR Pressure Transducer R1A R1B Relay Gas Valve SOV Shut Off Valve Gas SSV Safety Shut Off Valve Gas STS Space Temperature Selector SW1 Servi...

Page 89: ... MAXITROL SERIES 44 SYSTEMS AND SERIES 14 SYSTEMS WITH OPTIONAL RHA CONTROL FOR MAXITROL SERIES 44 SYSTEMS AND SERIES 14 SYSTEMS WITH RHA CONTROL USE 2 WIRE SHIELDED TWISTED PAIR 18 AWG MINIMUM RUN SEPARATE FROM ALL OTHER AC WIRING GROUND SHIELD AT REMOTE CONTROL STATION ONLY Typical ...

Page 90: ...charge temperature for make up air see Maxitrol 44 above or operated intermittently based on a thermostat at maximum discharge temperature for space heating Requires Maxitrol 44 controls and a signal to switch between modes Exhaust Fan Interlock Temperature Setback System Manual Make Up Air Switch etc Signal Conditioner SC25S The SC25S analog signal conditioner converts a 0 10 VDC or 4 20 mA contr...

Page 91: ...increase the discharge temperature Maxitrol Series 44 Tamperproof The Maxitrol Series 44 Tamperproof controls function identically to the Maxitrol Series 44 controls see gas control system except the space temperature selector T244A is replaced with two devices The adjustable portion the space temperature selector TD244A is mounted inside the Remote Control Station and the non adjustable tamperpro...

Page 92: ...to the TEMP SENSOR terminal block on the thermostat THERMISTOR INSTALLATION See Figure 2 1 Insert the star bushing through the opening in the enclosure 2 Run the thermistor leads through the star bushing 3 Attach the cover to the enclosure over the thermistor sensor 4 Separate and strip the ends of the lead wires 3 8 5 Open the terminal blocks for the sensor connections 6 Insert the lead wires and...

Page 93: ...mper motor operates on 24 Volts AC and transmits power to the motor starter when the damper blades are fully open by the closure of the damper end switch The damper end switch is an adjustable internal auxiliary switch which has been factory set to operate when the damper is fully open The damper motor will power closed when the heater cycles off The damper motor will not close unless the blower s...

Page 94: ...ressure switch should be set at 25 above manifold gas pressure The adjustment screw is located under the top plate HIGH PRESSURE REGULATOR HPR The high pressure regulator is required when the gas supply pressure exceeds the nameplate rating for the heater The high pressure regulator assembly is also furnished with a high gas pressure manual shut off valve and a tap for measuring the upstream gas p...

Page 95: ...611 valve the minimum fire adjusting screw is located on the far side of the valve under the dust cover On the Maxitrol MR212 valve the minimum fire adjusting screw is located under the large dust cover The MR212 modulating valve also serves as the manifold pressure regulator to control the burner manifold pressure The MR212 is rated for 5 PSIG COMBINATION VALVE The combination valve serves as a m...

Page 96: ...heating cycle to obtain proper ignition The voltage to the modulating valve is adjusted between 9 and 13 Volts DC by an adjustable potentiometer on the multi functional PC board SERVICE SWITCH SW1 SW2 SW3 The service switches are mounted in the electrical control enclosure In the LOCAL or OFF position the service technician has local control of the heater These switches must be placed in the REMOT...

Page 97: ...ge to the drive tube of the damper assembly CAUTION If the drive tube bottoms out against the damper motor housing damage to the PC board or tripping of the onboard fuse may result If the fuse trips place the blower service switch in the OFF position for 15 seconds to allow the fuse to reset Proceed with steps 4 through 10 BEFORE connecting the damper motor to the linkage arm 4 Verify the cam loca...

Page 98: ...the 3 8 diameter bolt can seat into the nut on the damper linkage Maintain the damper blades in the tightly held fully closed position during this adjustment 13 Turn the heater disconnect switch on and place the blower service switch to the LOCAL position Damper will open to the point the upper cam engages the upper limit switch 14 Using the deep well 1 2 hex socket or nut driver turn the upper ca...

Page 99: ... transformer a Check disconnect and supply fusing b Replace control fuse c Replace transformer 7 Class 2 Transformer a No output voltage b Defective transformer a Check supply voltage b Replace transformer 8 Multi Functional PC Board a No input voltage on Terminal G RCS b Improper wiring c Defective board a Check voltage in RCS b Check wiring c Replace multi functional PC board 9 Damper Motor a Da...

Page 100: ...R RUNS NO HEAT FLAME SAFEGUARD RELAY LOCKS OUT 1 Igniter a No current open igniter b No voltage During trial for ignition a Check igniter current b Check FSR output to igniter 2 High Limit a High limit tripped a See Problem Number VI 3 High or Low Gas Pressure Switches a Low gas pressure switch tripped b High gas pressure switch tripped c Defective gas pressure switch a Check gas supply for low ga...

Page 101: ... FSR grounded a3 Tighten loose ground screws b Clean terminal and reinsert 4 Fluctuating Flame Current a Unit overfiring b Minimum fire set too low c Intermittent ground connection d Defective burner a Check manifold pressure b Adjust minimum fire on modulating valve c Tighten all ground points d e Replace burner 5 Flame Safeguard Relay a Defective FSR a Replace FSR 6 High Limit a High limit conta...

Page 102: ...n c Reduce differential setting d Replace thermostat 2 Burner Service Switch a Switch in LOCAL position a Place switch in REMOTE position 3 Auxiliary Control a Auxiliary contacts closed a Check auxiliary circuit wiring and contacts 4 Misunderstood Control System Operation a Control system doesn t function as expected a Review control system operational characteristics VIII MODULATING VALVE DOES NO...

Page 103: ...assembled a Disassemble valve and remove foreign material b Disassemble valve and assemble correctly IX MODULATING VALVE DOES NOT MODULATE CONTINUOUS LOW FIRE 1 Class 2 Transformer a No voltage output to amplifier a1 Check for short in modulating valve coil a2 Replace transformer 2 Modulating Valve a Valve coil is open or shorted b Plunger jammed c Ruptured main or balancing diaphragm a Replace va...

Page 104: ...ressure drop and adjust profile damper b Replace Airflow Switch 8 Multi Functional PC Board a Temp sensor wires not seated properly in terminal block b Defective board a Reinstall sensor wires b Replace board X ERRATIC OR PULSATING FLAME 1 High Pressure Regulator a Vent undersized b Defective regulator a Enlarge vent piping size or reduce vent piping length b Replace regulator 2 Amplifier a Huntin...

Page 105: ...s than 10 000 cfm The Cambridge Air Solutions Temperature Setback System TSS will meet the standard A properly configured building DDC system with the necessary programming for zone control automatic shutdown and setback can also meet the standard Total airflow of all heaters exceeds 10 000 cfm The Cambridge Air Solutions Temperature Setback System TSS with optimum start control will meet the stan...

Page 106: ...Cambridge Air Solutions 104 M Series Technical Manual MODEL NO SERIAL NO Date Activity Technician MAINTENANCE LOG ...

Page 107: ...M Series Technical Manual 105 Cambridge Air Solutions MODEL NO SERIAL NO Date Activity Technician MAINTENANCE LOG ...

Page 108: ...Cambridge Air Solutions 106 M Series Technical Manual ...

Page 109: ...M Series Technical Manual 107 Cambridge Air Solutions ...

Page 110: ...Cambridge Air Solutions 108 M Series Technical Manual ...

Page 111: ...ons modify the design and or substitute equivalent materials without notice as the result of code requirements product enhancements ongoing research development and vendor changes beyond our control SCAN THIS CODE TO ACCESS OUR HOW TO SERVICE VIDEOS ONLINE https www cambridgeair com parts service how to service videos ...

Page 112: ...760 Long Road Crossing Dr Chesterfield MO 63005 Phone 636 532 2233 800 899 1989 Fax 636 530 6133 www cambridgeair com ...

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