background image

57

Do not mount the IAQ sensor in drafty areas such as near

supply ducts, open windows, fans, or over heat sources. Al-

low at least 3 ft (0.9 m) between the sensor and any corner.

Avoid mounting the sensor where it is influenced by the sup-

ply air; the sensor gives inaccurate readings if the supply air

is blown directly onto the sensor or if the supply air does not

have a chance to mix with the room air before it is drawn into

the return airstream.

Wiring the Indoor Air Quality Sensor 

 For each sensor, use two 2-conductor 18 AWG (American

Wire Gage) twisted-pair cables (unshielded) to connect the

separate isolated 24 vac power source to the sensor and to

connect the sensor to the control board terminals.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the sensor.

See Fig. 68. Connect the 4-20 mA terminal to the RTU Open

controller at J4-2 and connect the SIG COM terminal to the

RTU Open controller at J4-3. See Fig. 85.

    

Fig. 85 — RTU Open Controller/Indoor CO

2

 Sensor 

(33ZCSENCO2) Connections

OUTDOOR AIR QUALITY SENSOR (P/N 33ZCSENCO2

PLUS WEATHERPROOF ENCLOSURE) 

The outdoor air CO

2

 sensor is designed to monitor carbon

dioxide (CO

2

) levels in the outside ventilation air and inter-

face with the ventilation damper in an HVAC system. The

OAQ sensor is packaged with an outdoor cover. See Fig. 70.

The outdoor air CO

2

 sensor must be located in the economiz-

er outside air hood.

Wiring the Outdoor Air CO

2

 Sensor 

A dedicated power supply is required for this sensor. A

two-wire cable is required to wire the dedicated power supply

for the sensor. The two wires should be connected to the pow-

er supply and terminals 1 and 2.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the OAQ

sensor. See Fig. 68. Connect the 4 to 20 mA terminal to the

RTU Open controller at J4

-

5. Connect the SIG COM terminal

to the RTU Open controller at J4

-

6. See Fig. 86.

     

Fig. 86 — RTU Open Controller/Outdoor CO

2

 Sensor 

(33ZCSENCO2) Connections

SPACE RELATIVE HUMIDITY SENSOR OR

HUMIDISTAT 

Humidi-MiZer

®

 System Control Wiring

 In units equipped with the Humidi-MiZer option there are

two pink (PNK) wires loose in the control box used to control

the dehumidification function of the unit. These pink wires

are meant to be tied to a space humidistat or thermidistat on

an electromechanical unit. On RTU Open controller equipped

units these pink wires must be connected to J11

-

7 and 8 to al-

low the Open board to operate the dehumidification function

for the unit. Disconnect the J11 Phoenix style connector from

the board and use the plug screws to secure the pink wires in

pins 7 and 8, reconnect the plug to the board at J11.

Relative Humidity Sensors (Space or Duct Mounted)

 The accessory space humidity sensor (33ZCSENSRH-01)

or duct humidity sensor (33ZCSENDRH-01) is used to mea-

sure the relative humidity of air within the space or return air

duct. The RH reading is used to control the Humidi-MiZer

option of the rooftop unit. For wiring distances up to 500 ft

(152 m), use a 3-conductor, 18 or 20 AWG shielded cable.

The shield must be removed from the sensor end of the cable

and grounded at the unit end. The current loop power for sen-

sor is provided by the RTU Open controller as 24 vdc. Refer

to the instructions supplied with the RH sensor for the electri-

cal requirements and terminal locations. RTU Open controller

configurations must be changed after adding an RH sensor.

See Fig. 87 and 88 for typical RH sensor wiring.

• J4

-

1 or J4

-

4 = 24 vdc loop power

• J4

-

2 or J4

-

5 = 4-20mA signal input

NOTE: The factory default for dehumidification control is nor-

mally open humidistat.

      

Fig. 87 — Space Relative Humidity Sensor Typical 

Wiring

     

Fig. 88 — Duct Relative Humidity Sensor Typical 

Wiring

SEN

COM

J4-2

J4-3

IAQ Sensor

24 VAC

SEN

COM

J4-5

J4-6

OAQ Sensor/RH Sensor

24 VAC

SW2

1

2

3

4

5

6

ON

Io

Vin

Gnd

Vo

MOUNTING
HOLES

WIRING
OPENING

Vin  -  J4-1 or J4-4   24 vdc
Io   -  J4-2 or J4-5   -20mA output

SPAN

ZERO

4-20

mA

VAC

or

VDC

GND 0-5V

or

0-10V

1

2

3

4

5

6

ON

J4-1 or J4-4 + 24 VDC

SUPPLY VOLTAGE

J4-2 or J4-5 (-)4 to 20 mA Current 

LOOP OUTPUT TO RTU OPEN

RELATIVE HUMIDITY SENSOR

(POLARIZED MALE CONNECTOR)

Summary of Contents for WeatherMaster 50HC14

Page 1: ...es and work gloves Use quenching cloths for brazing operations and have a fire extinguisher available Read these instructions thoroughly and follow all warnings or cautions attached to the unit Consult local building codes and appropriate na tional electrical codes in USA ANSI NFPA70 National Electrical Code NEC in Canada CSA C22 1 for special requirements It is important to recognize safety infor...

Page 2: ...pment WARNING PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to follow this warning could cause personal injury or death Relieve pressure and recover all refrigerant before system repair or final unit disposal Wear safety glasses and gloves when handling refrigerants Keep torches and other ignition sources away from refrigerants and oils WARNING CUT HAZARD Failure to follow this caution may resu...

Page 3: ...ction and Diagnostic D ComfortLink Controls Intake Exhaust Options A None B Temperature Economizer w Barometric Relief F Enthalpy Economizer w Barometric Relief K 2 Position Damper U Low Leak Temperature Economizer w Barometric Relief W Low Leak Enthalpy Economizer w Barometric Relief Service Options 0 None 1 Unpowered Convenience Outlet 2 Powered Convenience Outlet 3 Hinged Panels 4 Hinged Panels...

Page 4: ...4 Fig 2 Unit Dimensional Drawing 14 Size Unit ...

Page 5: ...5 Fig 2 Unit Dimensional Drawing 14 Size Unit cont HORIZONTAL ECONOMIZER VERTICAL ECONOMIZER ...

Page 6: ... the unit Select a unit mounting system that provides adequate height to allow installation of condensate trap per require ments Refer to Step 9 Install External Condensate Trap and Line for required trap dimensions ROOF MOUNT Check building codes for weight distribution require ments Unit operating weight is shown in Table 2 Table 2 Operating Weights NOTE Unit not designed to have overhead obstru...

Page 7: ...ake electrical connections 9 Install other accessories FRAME MOUNTED INSTALLATION Frame mounted applications generally follow the se quence for a curb installation Adapt as required to suit spe cific installation plan Step 3 Inspect Unit Inspect unit for transportation damage File any claim with transportation agency Confirm before installation of unit that voltage amperage and circuit protection ...

Page 8: ...8 Fig 4 Roof Curb Details ...

Page 9: ...tly below unit discharge Step 6 Rig and Place Unit When the unit is ready to be rigged and no longer will be lifted by a fork truck the wood protector under the basepan must be removed Remove 4 screws from each base rail Wood protector will drop to the ground See instructions on the unit base rails Keep unit upright and do not drop Spreader bars are re quired Rollers may be used to move unit acros...

Page 10: ...t this time tape or otherwise cover the fittings so that moisture does not get into the building or conduit in the interim Remove all shipping materials and top skid Remove extra center post from the condenser end of the unit so that the con denser end of the unit matches Fig 20 22 Recycle or dispose of all shipping materials NOTES 1 SPREADER BARS REQUIRED Top damage will occur if spreader bars ar...

Page 11: ...n Place Field supplied flanges should be attached to horizontal duct openings and all ductwork should be secured to the flanges Insulate and weatherproof all external ductwork joints and roof or building openings with counter flashing and mastic in accordance with applicable codes Do not cover or obscure visibility to the unit s informative data plate when insulating horizontal ductwork Step 8 Ins...

Page 12: ...filter for use in the power exhaust hood assembly 1 The indoor coil access panel will be used as the top of the hood If the panel is still attached to the unit remove the screws along the sides and bottom of the panel See Fig 15 2 Swing out indoor coil access panel and insert the hood sides under the panel hood top Be careful not to lift the panel too far as it might fall out Use the screws provid...

Page 13: ...it in the side drain connection The piping for the condensate drain and external trap can be completed after the unit is in place See Fig 19 All units must have an external trap for condensate drain age Install a trap at least 4 in 102 mm deep and protect against freeze up If drain line is installed downstream from the external trap pitch the line away from the unit at 1 in per 10 ft 25 mm in 3 m ...

Page 14: ... with this accessory For smaller field discon nects be sure to use 1 2 in screws to mount the disconnect di rectly to the end panel see Fig 24 In either case set the dis connect vertical location on the unit so that a 90 degree fitting can be used to connect the conduit to the disconnect Fig 20 Conduit into Factory Option Non Fused Disconnect or HACR Fig 21 Conduit into Control Box Fig 22 Conduit ...

Page 15: ...A Disconnect Option 4 300 kcmil 25A HACR Option 14 1 0 30A HACR Option 14 1 0 35A HACR Option 14 1 0 40A HACR Option 14 1 0 50A HACR Option 14 1 0 60A HACR Option 14 1 0 70A HACR Option 14 1 0 80A HACR Option 14 1 0 90A HACR Option 14 1 0 100A HACR Option 14 1 0 110A HACR Option 4 300 kcmil 125A HACR Option 4 300 kcmil 150A HACR Option 4 300 kcmil 175A HACR Option 4 300 kcmil 200A HACR Option 4 30...

Page 16: ...iagram for additional information NOTE Check all factory and field electrical connections for tightness UNITS WITHOUT FACTORY INSTALLED NON FUSED DISCONNECT OR HACR When installing units provide a disconnect switch of ade quate size per NEC National Electrical Code Disconnect sizing data is provided on the unit informative plate Locate on unit cabinet or within sight of the unit per national or lo...

Page 17: ...d 11 Engaging the shaft into the handle socket re install three hex screws on the NFD enclosure 12 Re install the unit front panel Fig 28 Handle and Shaft Assembly for NFD Fig 29 Location of HACR Enclosure To field install the HACR shaft and handle 1 Remove the unit front panel see Fig 2 2 Remove three hex screws on the HACR enclosure two on the face of the cover and one on bottom 3 Remove the fro...

Page 18: ...e conve nience outlet circuit being de energized when the unit discon nect switch is open See Fig 33 On a unit without a unit mounted disconnect connect the source leads to the main ter minal block TB1 If the convenience outlet transformer is connected to the line side of a field disconnect the conduit provided with the unit must be used to protect the wire as they are routed from the transformer ...

Page 19: ... unit as shipped from the factory If field installed accessories are added or changed in the field i e power ex haust the HACR may no longer be of the proper amp rating and therefore will need to be removed from the unit See unit nameplate and label on factory installed HACR for the amp rating of the HACR that was shipped with the unit from the factory See unit nameplates for the proper fuse HACR ...

Page 20: ...ox Use this hole for the control conduit UNITS WITHOUT THRU BASE CONNECTIONS 1 Install power wiring conduit through side panel open ings Install conduit between disconnect and control box 2 Install power lines to terminal connections as shown in Fig 25 FIELD CONTROL WIRING The 50HC 14 unit requires an external temperature con trol device This device can be a thermostat field supplied or a PremierL...

Page 21: ... that it will not be damaged by contact with the condenser coil See Fig 39 NOTE If thru the bottom connections accessory is used refer to the accessory installation instructions for information on routing power and control wiring HEAT ANTICIPATOR SETTINGS Set heat anticipator settings at 0 14 amp for the first stage and 0 14 amp for second stage heating when available Fig 39 Thermostat Wire Routin...

Page 22: ...the orange and brown wires locat ed on TB4 See Fig 42 Fig 42 Single Stage Heaters TB4 Wiring Connections Two Stage Heaters Two stage heaters will have orange violet red and brown wires The orange and the purple are the control wires and the red and brown wires feed the safety circuit Connect both the orange and the purple wires to the orange wire locations of TB4 Connect the red and brown wires to...

Page 23: ...tat multi conductor thermostat cable field supplied through the bushing in the unit s lou vered end panel see Fig 39 2 Route the cable through the snap in wire tie and up to the web bushing near the control box 3 Feed the cable through the bushing and into the bottom left side of the control box after removing one of the two knockouts in the corner of the box Use a connector to protect the cable a...

Page 24: ...24 Fig 46 Typical Humidi MiZer Adaptive Dehumidification System Humidistat Wiring ...

Page 25: ...le The module is the core of the EconoMi er X system The module is mounted in the unit s control box and includes the user interface for the system The W7220 economizer module provides the basic inputs and outputs to provide simple econ omizer control When used with the optional sensors the economizer module provides more advanced economizer functionality S Bus Enthalpy Control Sensors The sensor ...

Page 26: ... O All Relay Outputs at 30 Vac Running 1 5A maximum Inrush 7 5A maximum ENVIRONMENTAL Operating Temperature 40 to 150 F 40 to 65 C Exception of display operation down to 4 F with full re covery at 4 F from exposure to 40 F Storage Temperature 40 to 150 F 40 to 65 C Shipping Temperature 40 to 150 F 40 to 65 C Relative Humidity 5 to 95 RH non condensing ECONOMIZER MODULE WIRING DETAILS Use Fig 49 an...

Page 27: ...menu navigation Settings and parameter changes Menu structure and selection USER INTERFACE The user interface consists of a 2 line LCD display and a 4 button keypad on the front of the economizer controller KEYPAD The four navigation buttons see Fig 52 are used to scroll through the menus and menu items select menu items and to change parameter and configuration settings LABEL TYPE DESCRIPTION Top...

Page 28: ...d parameters for the EconoMi er X system The Menus in display order are STATUS SETPOINTS SYSTEM SETUP ADVANCED SETUP CHECKOUT ALARMS NOTE Some parameters in the menus use the letters MA or MAT indicating a mixed air temperature sensor location before the cooling coil This unit application has the control sensor lo cated after the cooling coil in the fan section where it is desig nated as Cooling S...

Page 29: ...Displays when Discharge Air sensor is connected and displays measured discharge temperature Displays _ _ _F if sensor sends invalid value if not connected short or out of range OA TEMP _ _ _ F 40 to 140 F OUTSIDE AIR TEMP Displays measured value of outdoor air temperature Displays _ _ _F if sensor sends invalid value short or out of range OA HUM _ _ 0 to 100 OUTSIDE AIR RELATIVE HUMIDITY Displays ...

Page 30: ... v if 3 sensors RA OA and MA In AUTO mode dampers controlled by CFM 100 to 9990 cfm increment by 10 If OA MA RA and CO2 sensors are connected and DCV CAL ENABLE is set to AUTO mode the OA dampers are controlled by CFM and displays from 100 to 9990 CFM 2 to 10 vdc With 2 speed fan units VENT L low speed fan and MIN POS H high speed fan settings are required Default for VENTMAX L is 3 2 v and VENTMA...

Page 31: ...l change to the factory default values NOTE RECHECK AUX2 IN and FANTYPE for required 2 speed values ADVANCED SETUP MA LO SET 45 F 35 to 55 F Incremented by 10 SUPPLY AIR TEMPERATURE LOW LIMIT Temperature to achieve Freeze Protection close damper and alarm if temperature falls below setup value FREEZE POS CLO CLO or MIN FREEZE PROTECTION DAMPER POSITION Damper position when freeze protection is act...

Page 32: ...ac out Issues a system alarm CONNECT EXH1 N A N A Closes the power exhaust fan 2 relay EXH1 ALARMS Alarms display only when they are active The menu title ALARMS includes the number of active alarms in parenthesis When using SYLK bus sensors SYLK will appear on the screen and when using 20k OA temperature sensors SENS T will appear on the screen MA T SENS ERR N A N A SUPPLY AIR TEMPERATURE SENSOR ...

Page 33: ...osition settings and checkout menu readings see Table 9 For dry bulb operation with a 1 speed indoor fan with or without DCV see Tables 10 and 11 For enthalpy operation with a 1 speed indoor fan with or without DCV see Tables 12 and 13 For dry bulb operation with a 2 speed indoor fan with or without DCV see Tables 14 and 15 For enthalpy operation with a 2 speed indoor fan with or without DCV see T...

Page 34: ...v Off 0 v Off MIN POS Closed ON OFF HIGH 24 v On 0 v Off MIN POS Closed ON ON HIGH 24 v On 24 v On MIN POS Closed NONE YES OFF OFF HIGH 0 v Off 0 v Off MIN POS Closed ON OFF HIGH 0 v Off 0 v Off MIN POS to Full Open Closed to Full Open ON ON HIGH 24 v On 0 v Off MIN POS to Full Open Closed to Full Open DEMAND CONTROLLED VENTILATION DCV OUTSIDE AIR GOOD TO ECONOMIZE Y1 I Y2 I FAN SPEED Y1 O Y2 O OC...

Page 35: ... MIN POS to Full Open Closed to Full Open DEMAND CONTROLLED VENTILATION DCV OUTSIDE AIR GOOD TO ECONOMIZE Y1 I Y2 I FAN SPEED Y1 O Y2 O OCCUPIED UNOCCUPIED Below CO2 Set No OFF OFF HIGH 0 v Off 0 v Off VENTMIN Closed ON OFF HIGH 24 v On 0 v Off VENTMIN Closed ON ON HIGH 24 v On 24 v On VENTMIN Closed Yes OFF OFF HIGH 0 v Off 0 v Off VENTMIN Closed ON OFF HIGH 0 v Off 0 v Off VENTMIN to Full Open C...

Page 36: ...On 24 v On VENTMIN to VENTMAX Closed Yes OFF OFF LOW 0 v Off 0 v Off VENTMIN to VENTMAX Closed ON OFF LOW 0 v Off 0 v Off VENTMIN to Full Open Closed to Full Open ON ON HIGH 24 v On 0 v Off VENTMIN to Full Open Closed to Full Open DEMAND CONTROLLED VENTILATION DCV OUTSIDE AIR GOOD TO ECONOMIZE Y1 I Y2 I FAN SPEED Y1 O Y2 O OCCUPIED UNOCCUPIED NO CO2 SENSOR NO OFF OFF LOW 0 v Off 0 v Off MIN POS Cl...

Page 37: ...rolled by the W7220 but it requires the status to know where to position the OA damp er for minimum position for the fan speed The 2 speed fan delay is available when the system is pro grammed for 2 speed fan in the System Setup menu item The 2 speed fan delay is defaulted to 5 minutes and can be changed in the Advanced Setup menu item When the unit has a call for Y1 In and in the free cooling mod...

Page 38: ...u can also navigate to the Alarms menu at any time Clearing Alarms Once the alarm has been identified and the cause has been removed e g replaced faulty sensor the alarm can be cleared from the display To clear an alarm perform the following 1 Navigate to the desired alarm 2 Press the button 3 ERASE displays 4 Press the button 5 ALARM ERASED displays 6 Press the Menu up Exit button to complete the...

Page 39: ...39 Fig 54 50HC14 Control Box Component Locations with ComfortLink Controls ...

Page 40: ...40 Fig 55 50HC14 ComfortLink Control Wiring Diagram ...

Page 41: ...41 Fig 56 50HC14 ComfortLink Power Wiring Diagram ...

Page 42: ...42 Fig 57 50HC14 ComfortLink with Humidi MiZer Power Wiring Diagram ...

Page 43: ...ugh harnesses connected to the CTB thermostat Field connections are made at a 16 pole terminal block TB3 located on the bottom shelf of the unit control box in front of the PremierLink controller The factory installed Premier Link controller includes the supply air temperature SAT sensor The outdoor air temperature OAT sensor is included in the FIOP accessory EconoMi er 2 package The PremierLink c...

Page 44: ...44 Fig 60 PremierLink Wiring Schematic ...

Page 45: ...45 Fig 61 PremierLink Wiring Schematic with Humidi MiZer System Option ...

Page 46: ...anagement functions can be enhanced with field installation of these accessory control devices Enthalpy control outdoor air or differential sensors Space CO2 sensor Outdoor air CO2 sensor Refer to Table 20 for accessory part numbers Field Connections Field connections for accessory sensor and input devices are made at the 16 pole terminal block TB3 located beneath the PremierLink controller See Fi...

Page 47: ...utdown IAQ Indoor Air Quality CO2 OAQ Outdoor Air Quality CO2 RH Relative Humidity SFS Supply Fan Status T55 Space Temperature Sensor T56 Space Temperature Sensor TB3 TERMINAL FIELD CONNECTION INPUT SIGNAL 1 RAT SEN Analog 10k thermistor 2 G Discrete 24 vac 3 RAT SEN Analog 10k thermistor 4 Y1 Discrete 24 vac 5 6 Y2 Discrete 24 vac 7 LOOP PWR Analog 24 vdc 8 W1 Discrete 24 vac 9 IAQ SEN Analog 4 2...

Page 48: ...nk TB3 as shown in Fig 67 If the 50HC 14 unit is equipped with factory installed smoke detector s disconnect the factory BLU lead at TB3 6 Y2 before connecting the thermostat Identify the BLU lead originating at CTB DDC 1 disconnect at TB3 6 and tape off Confirm that the second BLU lead at TB3 6 remains connect ed to PremierLink J4 8 If the 50HC 14 unit has an economizer system and free cooling op...

Page 49: ...to mix with the room air before it is drawn into the return airstream Fig 68 Indoor Outdoor Air Quality CO2 Sensor 33ZCSENCO2 Typical Wiring Diagram Wiring the Indoor Air Quality Sensor For each sensor use two 2 conductor 18 AWG American Wire Gage twisted pair cables unshielded to connect the separate isolated 24 vac power source to the sensor and to connect the sensor to the control board termina...

Page 50: ...supplied BLACK wire from the sensor to TB3 7 Humidistat connections A humidistat cannot be directly connected to the Premier Link controller Follow the instructions on pages 22 25 to connect a humidistat or a thermostat as an electromechanical device SMOKE DETECTOR FIRE SHUTDOWN FSD This function is available only when the PremierLink con troller is configured for Space Sensor Mode The unit is fac...

Page 51: ...ller Power Exhaust Output Connection CCN COMMUNICATION BUS The PremierLink controller connects to the bus in a daisy chain arrangement Negative pins on each component must be connected to respective negative pins and likewise posi tive pins on each component must be connected to respective positive pins The controller signal pins must be wired to the signal ground pins Wiring connections for CCN m...

Page 52: ...to the RTU Open Selection of the communication protocol and baud rate are made at on board DIP switches Refer to Table 25 RTU Open Controller Inputs and Out puts for locations of all connections to the RTU Open control ler board Fig 79 RTU Open Multi Protocol Controller Board SIGNAL TYPE CCN BUS WIRE COLOR CCN PLUG PIN NUMBER Red 1 GROUND White 2 Black 3 CCN Bus J2 1 J2 2 GND WHT 12 14 TB3 J2 3 BL...

Page 53: ...53 Fig 80 RTU Open System Control Wiring Diagram ...

Page 54: ...54 Fig 81 RTU Open System Control Wiring Diagram with Humidi MiZer System Option ...

Page 55: ...ide Air Temperature oa_temp AI 10K Thermistor J2 3 4 Analog Input 7 Space Temperature Offset Pot stpt_adj_offset AI 100K Potentiometer J20 3 4 Analog Input 11 Safety Chain Feedback safety_status BI 24 vac J1 9 Binary Input 4 Compressor Safety Status Note 1 comp_status BI 24 vac J1 2 Binary Input 3 Fire Shutdown Status firedown_status BI 24 vac J1 10 Binary Input 5 Enthalpy Status enthalpy_status B...

Page 56: ... up to 500 ft Use a three conductor shielded cable for the sensor and setpoint adjust ment connections If the setpoint adjustment slidebar is not required then an unshielded 18 or 20 gauge two conductor twisted pair cable may be used Connect T 55 See Fig 63 for typical T 55 internal connections Connect the T 55 SEN terminals to the RTU Open controller at J20 1 and J20 2 See Fig 82 Fig 82 RTU Open ...

Page 57: ...door CO2 Sensor 33ZCSENCO2 Connections SPACE RELATIVE HUMIDITY SENSOR OR HUMIDISTAT Humidi MiZer System Control Wiring In units equipped with the Humidi MiZer option there are two pink PNK wires loose in the control box used to control the dehumidification function of the unit These pink wires are meant to be tied to a space humidistat or thermidistat on an electromechanical unit On RTU Open contr...

Page 58: ...g MENU Config Inputs input 3 5 8 or 9 to Remote Oc cupancy and normally open N O or normally closed N C Also set MENU Schedules occupancy source to DI on off Input 8 or 9 is recommended for ease of installation Refer to Fig 79 and Table 25 for wire terminations at J5 Power Exhaust output The relay used by the RTU Open controller board to con trol power exhaust is a dry contact which means it does ...

Page 59: ... port The Field Assistant s menu structure is similar and functions the same as i Vu controller See Fig 92 RTU OPEN CONTROLLER TROUBLESHOOTING Communication LEDs The LEDs indicate if the controller is speaking to the de vices on the network The LEDs should reflect communica tion traffic based on the baud rate set The higher the baud rate the more solid the LEDs will appear See Table 26 NOTE Refer ...

Page 60: ...ith economizer or in combination of Supply Air and Return Air Return Air smoke detectors are arranged for vertical return configura tions only All components necessary for operation are facto ry provided and mounted The unit is factory configured for immediate smoke detector shutdown operation additional wiring or modifications to unit terminal board may be neces sary to complete the unit and smok...

Page 61: ...e Fig 96 Step 2 3 Screw the sensor and detector plate into its operating position using screws from Step 1 See Fig 96 Step 3 4 Connect the flexible tube on the sampling inlet to the sampling tube on the basepan ADDITIONAL APPLICATION DATA Refer to the Application Data sheet titled Factory Installed Smoke Detectors for Small and Medium Rooftop Units 2 to 25 Tons for discussions on additional contro...

Page 62: ... Outdoor enthalpy sensor Differential enthalpy sensor Time Guard II compressor anti cycle control Outdoor coil protector grille Head pressure control Programmable setback thermostat Electrical mechanical thermostat and subbase Thermidistat device Humidistat Thermostat sensors CO2 sensor DDC interface PremierLink controller Louvered hail guard Phase monitor control Refer to separate installation in...

Page 63: ...Motor Mounting Pre Start and Start Up This completes the mechanical installation of the unit Re fer to the unit s Service Manual for detailed Pre Start and Start Up instructions Download the latest versions from HVAC Partners www hvacpartners com Table 1 Table 2 BELT CROSS SECTION SMALLEST SHEAVE DIAMETER BELT DEFLECTION FORCE LBS UNNOTCHED BELTS NOTCHED BELTS USED NEW USED NEW A AX 3 0 3 6 3 7 5 ...

Page 64: ......

Page 65: ......

Page 66: ...t to discontinue or change at any time specifications or designs without notice and without incurring obligations Catalog No 04 53500209 01 Printed in U S A Form 50HC 14 03SI Pg 66 8 18 Replaces 50HC 14 02SI Carrier Corporation 2018 ...

Page 67: ...ATING IN THE CORRECT DIRECTION VERIFY INSTALLATION OF THERMOSTAT II START UP ELECTRICAL TEMPERATURES PRESSURES VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS GENERAL ECONOMIZER MINIMUM VENTAND CHANGEOVER SETTINGS TO JOB REQUIREMENTS IF EQUIPPED VERIFY SMOKE DETECTOR UNIT SHUTDOWN BY UTILIZING MAGNET TEST NOTE To avoid injury to personnel and damage to equipment or property when completing the pro...

Page 68: ...TOR AS CONDENSER COIL WARMS 4 CHECK UNIT CHARGE PER CHARGING CHART 5 SWITCH UNIT TO HIGH LATENT MODE SUBCOOLER BY CLOSING HUMIDISTAT WITH Y1 CLOSED OBSERVE A REDUCTION IN SUCTION PRESSURE 5 TO 7 PSI EXPECTED B DISCHARGE PRESSURE UNCHANGED C LIQUID TEMPERATURE DROPS TO 50 TO 55 F RANGE D LIQUID SOLENOID VALVE LSV ENERGIZED VALVE CLOSES 6 SWITCH UNIT TO DEHUMID REHEAT BY OPENING Y1 OBSERVE A SUCTION...

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