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American Standard YHC033A, Installation Operation & Maintenance, Page: 2 / 48

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Table of Contents

General Information
Literature Change History ............. 3
Overview of Manual ....................... 3
Model Number Description ........... 3
Unit Nomenclature ........................ 4
Electro Mechanical Control ........... 5
Supply Fan Failure Input (Optional) 5
Clogged Filter Switch (Optional) ... 6
Compressor Disable (CPR1/2) ..... 6
ReliaTel Control ............................. 6
Electromechanical Control ............ 6
High Pressure Control (Optional) .. 6
ReliaTel Control ............................. 6
Electromechanical Control ............ 6
Power Exhaust Control (Optional) . 6
Lead/Lag Control ........................... 6
 (ZSM) (BAYSENS006B) ............... 6
 (ZSM) (BAYSENS008B) ............... 6
(BAYSENS010B) ........................... 6
Wall Mounted Relative Humidity
 Sensor (BAYSENS036A) .............. 6
Duct Mounted Relative Humidity
 Sensor  (BAYSENS037A) ............. 6

Programmable Zone Sensor -
(BAYSENS019B) ........................... 7
Remote Zone Sensor
(BAYSENS013B) ........................... 7
Remote Zone Sensor
(BAYSENS014B) ........................... 7
Remote Zone Sensor
(BAYSENS016A) ........................... 7
Remote Zone Sensor
(BAYSENS017B) ........................... 7
Electro Mechanical Control ........... 7
BAYSENS025A .............................. 7
High Temperature Sensor
(BAYFRST001A) ............................ 7
Evaporator Frost Control ............... 7
(ReliaTel™ Option) ........................ 7
(Electro Mechanical Option) .......... 7

Pre-Installation Checklist
Smoke Detector Sensor ................ 8
Phase Monitor ............................... 8
ReliaTel Control Only .................... 8
Precautionary Measures ............... 9

Unit Clearances

..................................................... 10

Unit Dimensions

..................................................... 11
..................................................... 12

Installation

Rigging and
Center-of-Gravity Data ................ 14
Foundation .................................. 15
Horizontal Units ........................... 15
Downflow Unit Supply &
Return Air Openings .................... 15
Downflow Unit Supply &
 Return Air Openings ................... 15
Installation ................................... 16
Downflow ..................................... 16
Factory Installed Economizer ...... 17
Temperature Limit Switch
Usage for Gas Heat Units ............ 17
IHorizontal
Discharge Conversion ................ 18
TCO-A Instructions: ...................... 18
ITCO-A Instructions: ..................... 19
Return Air Smoke Detector .......... 20
Through the Base Gas Installation21
Requirements for Gas Heat ......... 21
Condensate Drain Configuration 22
Filter Installation .......................... 22
Standard Wiring ........................... 23
Optional TBUE Wiring .................. 23
Field Installed Control Wiring ...... 23
Control Power Transformer .......... 23
Controls using 24 VAC ................ 24
24V AC Conductors with
 Reliatel ........................................ 24
24V AC Conductors with
Electromechanical Unit ............... 24
Controls using DC Analog
 Input/Outputs ............................... 24
(Standard Low Voltage
 Multiconductor Wire) ................... 24
(Dehumidification Option) ........... 25
Electro Mechanical Control ......... 26
Customer Low Voltage Routing- . 26
ReliaTel  Control .......................... 26
Customer Low Voltage Routing- . 26
Smoke Detector ........................... 27
Customer Low Voltage Wiring- .... 27
Space Temperature Averaging .... 28
Sizing Natural Gas Pipe
Mains & Branches ....................... 30

Pre-start
Voltage Imbalance ....................... 31
Electrical Phasing ........................ 31
Compressor Crankcase Heaters . 31
Electro Mechanical Controls ....... 33
Electrocmechanical Controls ...... 33
Fan Test and Minimum Ventilation 33
Economizer Cooling .................... 33
(Units with Direct Drive Indoor Fan)33
ReliaTel Control ........................... 33
(Units with Belt Drive Indoor Fan) 34

Start-Up

Compressor Start-Up ................... 35
Scroll Compressors ..................... 35
Dehumidification Option .............. 35
Gas Heat Units ............................ 36
Final System Setup ...................... 36

Maintenance
Fan Belt Adjustment -
Belt Drive Units ............................ 37
Belt Tension Gauge ..................... 37
Filters ........................................... 38
Return Air Smoke Detector
Maintenance ................................ 38
Cooling Season ........................... 38
Heating Season ........................... 38
Dehumidification Option .............. 40
Annual Maintenance ................... 40
Final Process ............................... 40
Sample Maintenance Log ........... 40

Trouble Shooting
ReliaTel Control ........................... 41
System Status
Checkout Procedure ................... 41
System Failure ............................. 41
Heating Failure ............................ 41
Trouble Shooting ......................... 42
Cooling Failure ............................ 42
Service Failure ............................. 42
Simultaneous
 Heat and Cool Failure ................ 42
Cool Failure ................................. 42
Resetting
Cooling and Ignition Lockouts .... 42
(ZTS) Service Indicator ................ 42
Fan Failure Switch ....................... 43
(ZTEMP) ....................................... 43

Cooling Set Point (CSP)
and Heating Set Point (HSP) ....... 43
Relative Humidity Sensor Test .... 43
Testing serial
 communication voltage .............. 43
ReliaTel Refrigeration
 Module (RTRM) Default Chart .... 44
Unit Economizer Control
(ECA) Troubleshooting ................ 44
ReliaTel Control ........................... 44
Electro Mechanical Control ......... 44
Cooling Failure ............................ 45
Resetting Cooling and
Ignition Lockouts ......................... 45
Unit Economizer Control (ECA)
Test Procedures ........................... 45
Electro Mechanical Control ......... 45
Testing the ECA
resistors and sensors .................. 45

Summary of Contents for YHC033A

Page 1: ...e by qualified experienced technicians American Standard 2005 Models YSC036A YSC120A YHC033A YHC120A YSC036E YSC060E INSTALLATION OPERATION MAINTENANCE Customer Property Contains wiring ser vice and operation information Please retain Packaged Gas Electric 3 Through 10 Ton IMPORTANT NOTE All phases of this installation must comply with the NATIONAL STATE LOCAL CODES In addition to local codes the ...

Page 2: ...ontrols using 24 VAC 24 24V AC Conductors with Reliatel 24 24V AC Conductors with Electromechanical Unit 24 Controls using DC Analog Input Outputs 24 Standard Low Voltage Multiconductor Wire 24 Dehumidification Option 25 Electro Mechanical Control 26 Customer Low Voltage Routing 26 ReliaTel Control 26 Customer Low Voltage Routing 26 Smoke Detector 27 Customer Low Voltage Wiring 27 Space Temperatur...

Page 3: ...rs and service engineers to define the opera tion specific components and other options for any specific unit When ordering replacement parts or requesting service be sure to refer to the specific model number and serial num ber printed on the unit nameplate WARNING Contains Refrigerant System contains oil and refrigerant under high pressure Recover refrigerant to relieve pressure before opening t...

Page 4: ...stalled Options ThroughThe Base 0 Without Through The Base Connection A Through The Base Electrical Connection B Through The Base Gas Connection C Through The Base Electrical and Gas Connection Digit 19 Factory Installed Options Disconnect Switch Circuit Breaker 0 Without Disconnect Switch Circuit Breaker Phase Monitor 1 Unit Mounted Non Fused Disconnect Switch 2 Unit Mounted Circuit Breaker 3 Uni...

Page 5: ...or comparative humidity return air humidity against ambient humidity sensors if selected to control dampers to an accuracy of 5 of stroke The ac tuator is spring returned to the closed position any time that power is lost to the unit It is capable of delivering up to 25 inch pounds of torque and is powered by 24 VAC RTCI ReliaTel Trane Communication Interface Optional This module is used when the ...

Page 6: ...r out If four consecutive open conditions occur during an active call for cooling the compressor will be locked out a diganostic communicated to ICS if applicable and a manual reset required to restart tyhe compressor On dual compressor units only the affected compressor circuit is locked out Electromechanical Control When the HPC is opened the compressor for that circuit is turned off immediately...

Page 7: ... sensor can be used for outside air ambient sensing return air temperature sensing supply air temperature sensing remote temperature sensing un covered Wiring procedures vary according to the particular application and equipment involved Refer to the unit s wiring diagrams for proper connections Remote Zone Sensor BAYSENS017B This electronic sensor can be used with BAYSENS006B 008B 010B 019B Remot...

Page 8: ...s concerning these checks and procedures refer to the appropriate section s of the smoke detector Installation and Maintenance Instructions provided with the literature package for this unit In order for the supply air smoke detector or return air smoke detector to properly sense smoke in the supply air stream or return air stream the air velocity entering the smoke detector unit must be between 5...

Page 9: ... job site inspection of the unit reveals damage or material shortages file a claim with the carrier immediately Specify the type and extent of the damage on the bill of lading before signing Visually inspect the internal components for shipping damage as soon as possible after delivery and before it is stored Do not walk on the sheet metal base pans If concealed damage is discovered notify the car...

Page 10: ...he minimum distances necessary to assure adequate serviceability cataloged unit capacity and peak operating efficiency Providing less than the recommended clearances may re sult in condenser coil starvation short circuiting of exhaust and economizer airflows or recirculation of hot condenser air Figure 1 Typical Installation Clearances for Single Multiple Unit Applications ...

Page 11: ...Data YHC033A Y H S C036A YHC043A Y H S C048A Low and Medium Heat YSC060A Low and Medium Heat Unit Dimensional Data YHC033A Y H S C036A YHC043A Y H S C048A High Heat YSC060A High Heat YHC060A YHC063A Low Medium and High Heat YSC036E YSC048E YSC060E ...

Page 12: ...12 Unit Dimensions Figure 2 Continued Unit Dimensional Data Y H S C072A YSC090A YSC092A Unit Dimensional Data YHC092A Y H S 102A Y H S C120A ...

Page 13: ... 4 K W L X 933 310 253 171 198 40 21 YSC120A 3 4 W M Y 945 313 257 174 200 40 21 YSC120A 3 4 K W H Z 958 317 261 177 202 40 21 YHC036A1 L M X Y 470 150 120 95 105 32 19 YHC036A1 H Z 497 158 128 101 110 32 19 YHC033A 3 4 W L M X Y 537 159 139 126 111 32 19 YHC036A 3 4 W L M X Y 470 150 120 95 105 32 19 YHC033A 3 4 W H Z 537 159 139 126 111 32 19 YHC036A 3 4 W H Z 497 158 128 101 110 32 19 YHC048A1 ...

Page 14: ... as necessary for even unit lift Other lifting arrangements may cause equipment or property only damage Failure to properly lift unit may result in death or serious injury WARNING Improper Unit Lift Test lift unit approximately 24 inches to verify proper center of gravity lift point To avoid dropping of unit repo sition lifting point if unit is not level Failure to properly lift unit could result ...

Page 15: ... through the ductwork All outdoor ductwork between the unit and the structure should be weather proofed after installation is completed Figure 4 1 3 through 5Ton Downflow Unit Supply Return Air Openings 6 1 4 through 10Ton Downflow Unit Supply Return Air Openings Roof Curb Downflow The roof curbs for these units consists of a full perimeter enclosure to support the unit Before installing any roof ...

Page 16: ...r of Gravity dimensional data table is shown in Figure 3 Refer to the typical unit op erating weights table before proceeding 1 Remove all drill screws fastening wood protection to metal baserail Remove all screws securing wooden pro tection to wooden top crate 2 Remove Wooden Top Crate WARNING Heavy Objects Do not use cables chains or slings except as shown Each of the cables chains or slings use...

Page 17: ...90A M Y Y C092A M Y YHC092A H Z Y C102A M Y Y C102A H Z Y C120A M Y Y C120A H Z YSC036E L X YSC036E M Y YSC036E H Z YSC048E L X YSC048E M Y YSC048E H Z YSC060E L X YSC060E M Y YSC060E H Z If any of the aforementioned units are installed in the downflow discharge configuration remove the additional TC01 limit switch from the combustion blower motor and discard Horizontal Discharge Conversion 3Throu...

Page 18: ...O1 fol lowing the instructions in steps 1through 3 below If the unit being installed does not correspond to any in the following table skip steps1 through 3 and go on to next step in the in stallation process Y C036A H Z YSC048E H Z Y C048A H Z Y C060A H Z YHC060A M Y Unit Model Number YHC033A H Z YSC036E H Z YHC043A H Z YHC063A M Y YSC048E M Y YHC063A H Z WARNING Hazardous Voltage Disconnect all ...

Page 19: ...con trol shipped in the heater compartment Replace TCO1 fol lowing the instructions in steps 1through 3 below If the unit being installed does not correspond to any in the following table skip steps1 through 3 and go on to next step in the in stallation process Installation Y C092A M Y YHC092A H Z Y C102A M Y Y C102A H Z Y C120A M Y Y C120A H Z Unit Model Number Y C072A H Z YSC090A M Y WARNING Haz...

Page 20: ...n sert the tab on the left side into the slot on the indoor coil blockoff and secure the right side of the bracket with one of the 3 screws removed in step 2 Refer to Horizontal View 5 Using the remaining 2 screws removed in step 2 secure the bottom bracket Refer to Horizontal View Main Electrical Power Requirements Verify that the power supply complies with the unit name plate specifications Insp...

Page 21: ...e Gas Shut Off Valve if present Gas supply line properly sized and connected to the unit gas train All gas piping joints properly sealed Gas piping leak checked with a soap solution If piping connections to the unit are complete do not pressurize piping in excess of 0 50 psig or 14 W C to prevent com ponent failure Drip leg Installed in the gas piping near the unit Minimum gas supply pressure shou...

Page 22: ...t due to the drain connection being on the negative pressure side of the fan Install the P Trap using the guidelines in Figure 5 A condensate drain line must be connected to the P Trap Pitch the drain lines at least 1 2 inch for every 10 feet of horizontal run to assure proper condensate flow Do not al low the horizontal run to sag causing a possible double trap condition which could result in con...

Page 23: ...omer connection diagram that is shipped with the unit for specific termination points The termination points depending on the customer option se lected would be a factory mounted nonfused disconnect switch UDC or circuit breaker UCB If neither a factory mounted nonfused disconnect switch UDC or circuit breaker UCB was factory mounted field wiring connec tions should be terminated in the control bo...

Page 24: ...uge 000 140 m 75 mm2 461 732 feet 16 gauge 141 223 m 1 3 mm2 733 1000 feet 14 gauge 224 305 m 2 0 mm2 Installation Table 2B Electromechanical Thermostat 24V AC Conductors with Electromechanical Unit Distance from Recommended Unit to Control Wire Size 0 30 feet 22 gauge 0 9 1 m 33 m2 31 50 feet 20 gauge 9 5 15 2 m 50m2 51 75 feet 18 gauge 15 5 22 9 m 75 m2 76 125 feet 16 gauge 23 1 38 1 m 1 3 m2 12...

Page 25: ...eld Wiring Diagrams for Electro Mechanical ReliaTel Conventional Thermostat Field Wiring Diagrams RTRM ReliaTel Options Module ReliaTel Relative Humidity Sensor Dehumidification Option ReliaTel Humidistat Dehumidification Option ...

Page 26: ...26 Installation Electro Mechanical Control Customer Low Voltage Routing ReliaTel Control Customer Low Voltage Routing ...

Page 27: ...gle source supply Note Do not interconnect any smoke detectors together that have separate power supplies Do not exceed ten smoke detectors on one power supply Note Multiple System Sensor smoke detectors are connected together using terminals 1 and 12 on each detector If you have supply and return smoke detectors in all HVAC units you can connect a maximum of 5 HVAC units 10 de tectors up to one p...

Page 28: ...mperature av eraging Example 1 illustrates two series circuits with two sensors in each circuit wired in parallel The square of any number of remote sensors is required Example 2 illus trates three sensors squared in a series parallel circuit Us ing BAYSENS032 two sensors are required to accomplish space temperature averaging Example 3 illustrates the circuit required for this sensor Table 4 lists...

Page 29: ...29 Figure 6 Typical FieldWiring Diagrams for Optional Controls ReliaTel only Installation ...

Page 30: ...3 7 1 21 2 80 5 63 12 31 19 82 18 3 1 07 2 43 4 89 10 76 17 27 22 9 2 18 4 38 9 76 15 40 Capacity of Pipe of Different Diameters and Lengths in Cu Meter Per Hr with Pressure Drop of 74 6 Pa and Specific Gravity of 0 60 Figure 7 Schematic Diagram for Field Gas Piping to Unit Figure 8 Typical Unit GasTrain Configuration Use the checklist provided below in conjunction with the General Unit Requiremen...

Page 31: ...ptional factory mounted disconnect switch as follows Black phase A to L1 Red phase B to L2 Yellow phase C to L3 Close the field supplied main power disconnect switch or circuit protector switch that provides the supply power to the unit WARNING Live Electrical Components During installation testing servicing and troubleshooting of this product it may be necessary to work with live elec trical comp...

Page 32: ...ing across the two test terminals for two to three sec onds For the initial start up of the unit this method allows the technician to cycle a component On and have up to one hour to complete the check 2 Resistance Test Mode This method can be used for start up providing a decade box for variable resistance outputs is available This method initiates the different components of the unit one at a tim...

Page 33: ...TEST set the minimum posi tion setpoint for the economizer to 0 percent using the setpoint potentiometer located on the Economizer Control ECA if applicable Pre start ReliaTel Control Using the Service Test Guide in Table 5 momentarily jump across the Test 1 Test 2 terminals on LTB1 one time to start the Minimum Ventilation Test Electro Mechanical Control Using the Service Test Guide perform the p...

Page 34: ...sure is low causing motor HP output to be above table value change indoor fan speed and repeat steps 1 and 2 4 To stop the SERVICE TEST turn the main power discon nect switch to the Off position or proceed to the next component start up procedure Verifying Proper Air Flow Units with 5 Tap Direct Drive Indoor Fan Much of the systems performance and reliability is closely associated with and depende...

Page 35: ...ble 6 momentarily jump across the Test 1 Test 2 terminals on LTB1 one time to start the Minimum Ventilation Test Electro Mechanical Control Using the Service Test Guide perform the proper test mode connections Start Up 1 Set the minimum position setpoint for the economizer to the required percentage of minimum ventilation using the setpoint potentiometer located on the Economizer Con trol ECA The ...

Page 36: ...omentarily jump across the Test 1 Test 2 terminals on LTB1 one additional time if con tinuing from previous component start up or until the de sired start up component Test is started Start Up Electro Mechanical Control Using the Service Test Guide perform the proper test mode connections When starting the unit for the first time or servicing the heat ers it is a good practice to start the heater ...

Page 37: ... across the fan and motor sheaves Refer to Figure 9 5 Remove the belt tension gauge The small O ring now in dicates a number other than zero on the plunger s force scale This number represents the force in pounds re quired to give the needed deflection 6 Compare the force scale reading Step 5 with the ap propriate force value listed in Table 7 If the force read ing is outside the range readjust th...

Page 38: ...aining screws are reinstalled in the unit access panels once these checks are complete With the unit running check and record the ambient tem perature compressor suction and discharge pressures each circuit superheat each circuit Record this data on an operator s maintenance log like the one shown in Table 8 If the operating pressures indicate a refrigerant shortage measure the system superheat Fo...

Page 39: ...de of the coil first then spray the opposite side of the coil Allow the cleaning solution to stand on the coil for five minutes 7 Rinse both sides of the coil with cool clean water 8 Inspect both sides of the coil if it still appears to be dirty repeat Steps 6 and 7 9 Reinstall all of the components and panels removed in Step 1 and any protective covers installed in step 2 Note For units equipped ...

Page 40: ... F C F C ok ok low low ok ok low low ok ok low low ok ok low low Note Check and record the data requested above each month during the cooling season with the unit running Maintenance Slide style hail guard latch Annual Maintenance Clean and repaint any corroded surface Final Process For future reference you may find it helpful to record the unit data requested below in the blanks provided 1 Comple...

Page 41: ...mode Proceed to Step 6 6 Step the system through all of the available modes and verify operation of all outputs controls and modes If a problem in operation is noted in any mode you may leave the system in that mode for up to one hour while troubleshooting Refer to the sequence of operations for each mode to assist in verifying proper operation Make the necessary repairs and proceed to Steps 7 and...

Page 42: ...ough 10 from the Zone Sensor to the unit J6 terminals 6 through 10 Note If the system is equipped with a programmable zone sensor BAYSENS019B the LED indicators will not function while the BAYSENS010A is connected Resetting Cooling and Ignition Lockouts Cooling Failures and Ignition Lockouts are reset in an identical manner Method 1 explains resetting the system from the space Method 2 explains re...

Page 43: ...e forward direction If high resistance in both direc tions LED is open If low in both directions LED is shorted Method 3 To test LED s with ZSM connected to unit test voltages at LED terminals on ZSM A measurement of 32 VDC across an unlit LED means the LED has failed Relative Humidity Sensor Test This component is measured by measuring the mA output signal on the Relative Humidity Sensor Verify a...

Page 44: ...trical safety precautions when exposed to live electrical components could result in death or serious injury To prevent injury or death from electrocution it is the re sponsibility of the technician to recognize this hazard and use extreme care when performing service procedures with the electrical power energized 1 Verify that the LED on the IGN is burning continuously If the LED is lit go to Ste...

Page 45: ... is not driving the dampers verify that 24 VAC is between the ECA terminals TR and TR1 is present If 24 volts is not present a wiring or terminal problem exists from the control transformer Make any necessary repairs see wiring diagrams to troubleshoot 3 If 24 VAC is present adjust the minimum position potenti ometer fully clockwise If the actuator does not drive the economizer actuator is bad Rep...

Page 46: ... caused by unreasonable use of the combination gas electric air conditioner and or failure to properly maintain the combination gas electric air conditioner as set forth in the Use and Care manual This limited warranty applies to product installed on or after 10 1 2001 where product is manufactured after 1 1 2000 This limited warranty is not retroactive to any installations prior to 10 1 2001 or o...

Page 47: ...antor factory or warehouse at Warrantor designated shipping point freight allowed to Buyer s city replacement parts for Warrantor s products covered under this warranty Warrantor shall not be obligated to pay for the cost of lost refrigerant No liability shall attach to Warrantor until products have been paid for and then liability shall be limited solely to the purchase price of the equipment und...

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