York ZF SERIES Installation Manual Download Page 1

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R-410A

ZF SERIES

10 - 12-1/2 Ton
50 Hertz

5326602-XIM-B-1019

TABLE OF CONTENTS

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Preceding Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Side Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Power And Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Optional Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Optional Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Gas Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Options/Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Optional Hot Gas Bypass (HGBP) . . . . . . . . . . . . . . . . . . . . . . 28

Economizer Sequences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Dry Bulb Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Single Enthalpy Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Dual Enthalpy Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Auto . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Free Cooling Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Power Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Air Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Checking Air Quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . 45

No Outdoor Air Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Cooling Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Electric Heating Sequence Of Operations. . . . . . . . . . . . . . . . 48

Electric Heat Operation Errors . . . . . . . . . . . . . . . . . . . . . . . 48

Gas Heating Sequence Of Operations . . . . . . . . . . . . . . . . . . 48

Ignition Control Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Gas Heating Operation Errors . . . . . . . . . . . . . . . . . . . . . . . 49

Start-Up (Cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Start-Up (Gas Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Checking Gas Heat Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Charging The Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Start-Up Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

LIST OF TABLES

1 ZF120-150 Unit Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Weights and Dimensions Imperial . . . . . . . . . . . . . . . . . . . . . . 8

3 Weights and Dimensions Metric . . . . . . . . . . . . . . . . . . . . . . . 8

4 ZF120-150 Unit Accessory Weights Imperial . . . . . . . . . . . . . 9

5 ZF120-150 Unit Accessory Weights Metric . . . . . . . . . . . . . . . 9

6 ZF120-150 Unit Physical Dimensions Imperial . . . . . . . . . . . 10

7 ZF120-150 Unit Physical Dimensions Metric . . . . . . . . . . . . 10

8 ZF120-150 Unit Clearances Imperial . . . . . . . . . . . . . . . . . . . 11

9 ZF120-150 Unit Clearances Metric . . . . . . . . . . . . . . . . . . . . 11

10 ZF Side Duct Dimensions Imperial . . . . . . . . . . . . . . . . . . . . 14

11 ZF Side Duct Dimensions Metric . . . . . . . . . . . . . . . . . . . . . . 14

12 Control Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

13 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

14 ZF120-150 Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

15 Electric Heat Minimum Supply Air Imperial . . . . . . . . . . . . . . 24

16 Electric Heat Minimum Supply Air Metric . . . . . . . . . . . . . . . 24

17 Gas Heat Minimum Supply Air Imperial . . . . . . . . . . . . . . . . . 25

18 Gas Heat Minimum Supply Air Metric . . . . . . . . . . . . . . . . . . 25

19 Gas Pipe Sizing - Capacity of Pipe . . . . . . . . . . . . . . . . . . . . 26

20 Smart Equipment™ Economizer Board Details . . . . . . . . . . 30

21 Supply Air Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

22 Airflow Performance - Side Duct Application . . . . . . . . . . . . 35

23 Airflow Performance - Bottom Duct Application . . . . . . . . . . 38

24 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 41

25 Power Exhaust Specifications . . . . . . . . . . . . . . . . . . . . . . . . 41

26 Motor Sheave Datum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

27 Additional Static Resistance ZF120/150 Cabinet (Imperial) . 44

28 Additional Static Resistance ZF120/150 Cabinet (Metric) . . 45

29 Electric Heat Limit Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

30 Electric Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . . 48

31 Gas Heat Limit Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

32 Gas Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . . . . . 50

33 Gas Rate Cubic Feet Per Hour . . . . . . . . . . . . . . . . . . . . . . . 52

34 Gas Heat Stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

35 Ignition Control Flash Codes . . . . . . . . . . . . . . . . . . . . . . . . . 54

36 Smart Equipment™ UCB Details . . . . . . . . . . . . . . . . . . . . . 55

LIST OF FIGURES

1 Unit Shipping Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Condenser Covering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Compressor Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Component Location (ZF120 Shown) . . . . . . . . . . . . . . . . . . . 6

5 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Unit 6 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7 Center of Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

8 ZF120 Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

9 ZF150 Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

10 ZF120-150 Unit Bottom Duct Openings . . . . . . . . . . . . . . . . 12

11 ZF120-150 Unit Electrical Entry . . . . . . . . . . . . . . . . . . . . . . 13

12 ZF120 Unit Side Duct Openings . . . . . . . . . . . . . . . . . . . . . . 13

13 ZF150 Unit Side Duct Openings . . . . . . . . . . . . . . . . . . . . . . 14

14 ZF120 - 150 Unit Left Duct Opening . . . . . . . . . . . . . . . . . . . 14

15 ZF120-150 Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

16 ZF120-150 Transition Roof Curb . . . . . . . . . . . . . . . . . . . . . 15

17 Side Panels With Hole Plugs . . . . . . . . . . . . . . . . . . . . . . . . 16

18 Return Downflow Plenum With Panel . . . . . . . . . . . . . . . . . 16

19 Discharge Panel In Place . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

20 Save Side Panels For Economizer Hood Tops . . . . . . . . . . 16

21 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

22 Field Wiring Disconnect - Cooling Unit With/Without Electric

Heat 18

23 Field Wiring Disconnect - Cooling Unit With Gas Heat . . . . 19

24 Typical Electronic Thermostat Field Wiring . . . . . . . . . . . . . 20

25 Side Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

26 Bottom Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

27 SE-ECO1001-0 Economizer Controller . . . . . . . . . . . . . . . . 30

28 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

29 Dry Coil Delta P 50” Cabinet . . . . . . . . . . . . . . . . . . . . . . . . 42

30 Typical Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

31 Typical Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

32 Unit Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Summary of Contents for ZF SERIES

Page 1: ...r Imperial 25 18 Gas Heat Minimum Supply Air Metric 25 19 Gas Pipe Sizing Capacity of Pipe 26 20 Smart Equipment Economizer Board Details 30 21 Supply Air Limitations 33 22 Airflow Performance Side Du...

Page 2: ...oning equipment Be sure to follow all other applicable safety precautions and codes including ANSI Z223 1 or CSA B149 1 latest edition Improper installation may create a condition where the operation...

Page 3: ...ombustible material and may be installed directly on combustible flooring or in the U S on wood flooring or Class A Class B or Class C roof covering materials 4 For use with natural gas convertible to...

Page 4: ...SD SST Drain Pan A No Economizer B Economizer w Barometric RLF D Economizer w Power EXH H Motorized Damper Outdoor Air Option 1 No Service Options 2 DSC Disconnect Switch A No Sensors B PHM Phase Moni...

Page 5: ...s Figure 1 Unit Shipping Bracket 2 Turn each bracket toward the ground and the protective plywood covering will drop to the ground 3 Remove the condenser coil external protective covering prior to ope...

Page 6: ...ducts 1 877 UPG SERV for guidance Additional accessories may be needed for stable operation at temperatures below 30 F Roof curbs in eight and fourteen inch heights Roof curbs for transitioning from Y...

Page 7: ...unit is near the place of installation Rig the unit by attaching chain or cable slings to the lifting holes provided in the base rails Spreader bars whose length exceeds the largest dimension across...

Page 8: ...Location lbs Shipping Operating X Y A B C D A B C D E F 120 10 ZF 1065 1060 38 24 247 184 268 360 173 141 117 171 206 253 150 12 5 ZF 1258 1253 47 25 251 280 381 341 164 176 190 259 240 223 Table 3 W...

Page 9: ...le 8 tube 110 110 Table 5 ZF120 150 Unit Accessory Weights Metric Unit Accessory Weight kg Shipping Operating Economizer 40 8 38 6 Power Exhaust 18 1 15 9 Electric Heat1 1 Weight given is for the maxi...

Page 10: ...4X 24 38 NOTE XXX Indicates Millimeters 619 1159 379 379 1499 379 765 761 1499 106 694 538 2261 289 Table 6 ZF120 150 Unit Physical Dimensions Imperial Unit Model Number Dimension in A B C D E F 120...

Page 11: ...F120 150 Unit Clearances Metric Direction Distance mm Direction Distance mm Top1 1 Units must be installed outdoors Over hanging structure or shrubs should not obscure condenser air discharge outlet 1...

Page 12: ...tom gas supply entry FRONT RETURN AIR SUPPLY AIR RIGHT LEFT 20 1 8 19 1 8 17 1 8 6 13 16 6 13 16 32 11 16 14 1 2 16 3 8 18 1 16 25 9 16 12 5 16 27 1 2 24 21 18 89 2261 830 173 173 690 457 610 533 511...

Page 13: ...2 ZF120 Unit Side Duct Openings Disconnect Swith Cover Power Entry 2 1 2 Control Entry 7 8 Power Entry 2 1 2 Convenience Outlet Cover Convenience Outlet Power Entry 7 8 FRONT 64 22 64 22 Dot Plugs 5 5...

Page 14: ...2 7 8 5 5 32 D C 31 5 8 18 1 4 B A 464 75 805 131 NOTE XXX Indicates Millimeters Table 10 ZF Side Duct Dimensions Imperial Unit Model Number Dimension in A B C D 120 28 1 4 18 1 16 28 1 4 18 1 4 150 2...

Page 15: ...with flexible joints to minimize noise The supply and return air duct systems should be designed for the CFM and static pressure requirements of the job They 5 0 1 2 1 2 8 5 3 0 7 6 0 2 0 5 1 0 8 0 5...

Page 16: ...eat exchanger and unit bottom but there is room The return panel is secured with four screws Figure 17 Side Panels With Hole Plugs NOTE Orientation Panel is insulation side up Figure 18 Return Downflo...

Page 17: ...onal Electrical Code NEC ANSI NFPA No 70 Latest Edition in U S A current Canadian Electrical Code C221 and or local ordinances The unit must be electrically grounded in accordance with NEC and CEC as...

Page 18: ...r control circuit and power wiring information Power Wiring Detail Units are factory wired for the voltage shown on the unit nameplate Refer to Electrical Data Table 13 to size power wiring fuses and...

Page 19: ...IM B 1019 Johnson Controls Ducted Systems 19 Figure 23 Field Wiring Disconnect Cooling Unit With Gas Heat L1 T1 L2 T2 T3 L3 THREE PHASE POWER SUPPLY FACTORY OR FIELD SUPPLIED DISCONNECT GROUND LUG CON...

Page 20: ...ation See unit wiring diagram OCC C RC G Y2 Y1 W2 W1 X R THERMOSTAT TERMINALS CONTROL TERMINAL BLOCK TERMINALS ON A LIMITED NUMBER OF THERMOSTATS 1 4 3 1 2 4 Second stage ot required on single stage h...

Page 21: ...upply Blower Motor Pwr Exh Motor Electric Heat Option MCA1 Amps 1 Minimum Circuit Ampacity MCA1 w Pwr Exh Amps Max Fuse2 Breaker3 Size Amps 2 Maximum Over current Protection per Standard UL 1995 3 Fus...

Page 22: ...ant used R 410A R 410A Refrigerant charge lb oz System 1 7 12 8 3 System 2 7 8 8 10 AHRI HEATING PERFORMANCE Heating model N18 N24 N18 N24 Heat input K Btu 180 240 180 240 Heat output K Btu 144 192 14...

Page 23: ...DATA Quantity 1 1 Fan Size Inch 15 x 15 15 x 15 Type Centrifugal Centrifugal Motor Sheave 1VM50 1VP56 1VP56 Blower Sheave AK74 AK66 BK72 Belt A54 A56 BX56 Motor HP each 50 Hz 2 4 4 RPM 50 Hz 14253 14...

Page 24: ...ed where required by the factory Some kW sizes require fuses and others do not refer to Tables 15 and 16 for minimum CFM limitations and to Table 13 for electrical data Table 15 Electric Heat Minimum...

Page 25: ...differ with locality The value should be checked with the local gas utility Figure 25 Side Entry Gas Piping Figure 26 Bottom Entry Gas Piping NOTE Maximum capacity of pipe in cubic feet of gas per hou...

Page 26: ...for use with LP gas with accessory kit model number 1NP0442 All LP gas equipment must conform to the safety standards of the National Fire Protection Association Table 19 Gas Pipe Sizing Capacity of...

Page 27: ...ing to NFPA 72 requirements and cleaned at least once a year For specific troubleshooting and maintenance procedures please refer to the smoke detector s installation instructions which accompanies th...

Page 28: ...sure The opening pressure of the bypass valve is adjustable between 95 and 115 psig with a factory setting of 105 psig HGBP is optional with CV units Economizer Sequences Several functions can drive t...

Page 29: ...omizer output returns to 100 Once a compressor output is turned ON the economizer dampers continue to modulate to control the supply air temperature to the Economizer Setpoint At no time will a compre...

Page 30: ...nomizer actuator position feedback Connects through circuit trace to 24V IN pin HOT C COM Mixed Air Temperature sensor input from 10K 77 F Type III negative temperature coefficient thermistor MAT para...

Page 31: ...r Used to ramp the power exhaust fan VFD position the discharge damper actuator COM 24 VAC common 0 10 VDC negative for the power exhaust variable frequency drive discharge damper modulating power exh...

Page 32: ...sitive input from the Indoor Air Quality sensor IAQRange parameter sets the CO2 parts per million measured by the indoor air quality sensor when it outputs 10 VDC IAQ parameter reports input status 0...

Page 33: ...e unit point of power connection is misphased See PHASING Belt Tension The tension on the belt should be adjusted as shown in Figure 28 R 24V 24 VAC hot supplied for the building pressure sensor Conne...

Page 34: ...high altitude is less dense less static pressure will be generated and less power will be required than a similar application at sea level Air density correction factors are shown in Table 22 and Fig...

Page 35: ...7 1 88 2 06 1 65 1 73 1 78 1 43 1 59 1 55 1 24 1 43 1 35 1 08 249 1 85 2 17 1 74 1 74 1 92 1 54 1 54 1 62 1 30 1 28 1 33 1 06 299 1 66 1 98 1 58 1 46 1 69 1 35 349 1 32 1 66 1 33 ESP iwg Turns Open 0...

Page 36: ...g Turns Open 0 1 2 3 4 5 CFM Watts BHP CFM Watts BHP CFM Watts BHP CFM Watts BHP CFM Watts BHP CFM Watts BHP 0 35 6150 4171 4 47 5915 3774 4 05 5610 3309 3 55 5396 2948 3 16 4960 2495 2 68 0 6 5850 39...

Page 37: ...2 63 3 72 2 97 2 55 3 38 2 70 2 40 2 94 2 35 2 28 2 58 2 07 2 05 2 15 1 72 249 2 67 4 09 3 27 2 51 3 52 2 81 2 40 3 12 2 49 2 25 2 73 2 18 2 12 2 38 1 90 1 86 1 94 1 55 299 2 52 3 82 3 06 2 39 3 31 2...

Page 38: ...29 1 03 149 1 90 2 23 1 79 1 80 1 98 1 59 1 66 1 72 1 38 1 53 1 51 1 20 1 40 1 33 1 07 199 1 75 2 07 1 65 1 62 1 82 1 45 1 45 1 55 1 24 249 1 57 1 89 1 51 1 41 1 64 1 32 299 1 38 1 71 1 37 ESP iwg Tu...

Page 39: ...5 1 24 448 1 77 2 63 2 10 1 63 2 24 1 79 1 45 1 90 1 52 498 1 61 2 43 1 94 1 47 2 05 1 64 548 1 44 2 23 1 78 ESP iwg Turns Open 0 1 2 3 4 5 CFM Watts BHP CFM Watts BHP CFM Watts BHP CFM Watts BHP CFM...

Page 40: ...1 90 2 28 1 83 1 81 2 01 1 61 299 2 20 3 25 2 60 2 07 2 82 2 26 1 93 2 47 1 97 1 70 2 05 1 64 349 2 06 3 05 2 44 1 93 2 63 2 10 1 78 2 28 1 82 399 1 92 2 84 2 27 1 78 2 44 1 95 448 1 77 2 63 2 10 NOTE...

Page 41: ...6 inch holes one in the return air duct as close to the inlet of the unit as possible and another in the supply air duct as close to the outlet of the unit as possible 2 Using the whole drilled in ste...

Page 42: ...fter reading has been obtained remove the tubes and seal holes 9 Tighten blower pulley and motor sheave set screws after any adjustments Re check set screws after 10 12 hrs run time is recommended NOT...

Page 43: ...le systems effects that can result in loss of airflow Even small changes in blower speed can result in substantial changes in static pressure and BHP BHP and AMP draw of the blower motor will increase...

Page 44: ...full economizer operation Electric Heat KW2 18 24 36 54 2300 0 08 0 02 0 08 0 09 0 10 0 13 2500 0 09 0 02 0 09 0 10 0 11 0 14 2700 0 11 0 03 0 10 0 12 0 13 0 16 2900 0 12 0 03 0 11 0 13 0 14 0 18 310...

Page 45: ...mostat fan switch set to AUTO and the system switch set to either the AUTO or HEAT settings the blower is energized whenever a cooling or heating operation is requested The blower is energized after a...

Page 46: ...rgized the economizer Y2 will energize compressor 1 If the outdoor air is above the set point Y2 will energize compressor 2 Once the thermostat has been satisfied it will de energize Y1 and Y2 If the...

Page 47: ...ent mode the UCB has an Outdoor Air Temperature Sensor OAT with a low ambient setpoint at 45 F default When the OAT Sensor senses a temperature below the low ambient setpoint and the thermostat is cal...

Page 48: ...le 30 for the required electric heat anticipator setting Gas Heating Sequence Of Operations When the thermostat calls for the first stage of heating the low voltage control circuit from R to W1 is com...

Page 49: ...itself If the ICB finds the flame detection circuitry to be faulty the ICB will not permit an ignition sequence and the draft motor is energized If this failure should occur during an ignition cycle...

Page 50: ...it will cease all outputs ignore inputs and display the proper flash code for control replacement The ICB remains in this condition until replaced Flash Codes The ICB will initiate a flash code assoc...

Page 51: ...Turn ON electric power to unit 5 If thermostat set temperature is above room temperature the main burners will ignite If a second stage of heat is called for the main burners for second stage heat wi...

Page 52: ...er fire the furnace on first stage If in doubt it is better to leave the first stage of the furnace slightly over fired greater than 60 input Repeat Steps 1 6 NOTE To find the Btu input multiply the n...

Page 53: ...determine the furnace temperature rise Take readings of both the return air and the heated air in the ducts about 6 feet from the furnace where they will not be affected by radiant heat Increase the b...

Page 54: ...Normal Operation 1 Not Applicable 2 Pressure Switch Stuck Closed Pressure Switch 3 Pressure Switch Failed To Close Venter Pressure Switch Vent Blocked 4 Limit Switch Open Main Limit AUX Limit 5 Flame...

Page 55: ...stat connection strip R terminal right FAN OVR pin right HPS1 pin right HPS2 pin lower DFS pin and lower APS pin Terminal Thermostat connection strip on left edge of UCB W1 1st stage heating request 2...

Page 56: ...e temperature if no other space temperature input is present OAT Outside Air Temperature sensor input from 10K 77 F Type III negative temperature coefficient thermistor Input required for operation bu...

Page 57: ...ontact switching Output relay circuitry is isolated from other UCB components and the 24 VAC hot source may be from a second transformer in the unit Pin Heat section connections at right on lower edge...

Page 58: ...through circuit trace to the right LPS2 pin LPS2 right pin 24 VAC hot out for refrigerant circuit 2 Low Pressure Switch Not effective for one stage compressor UCBs Connects through circuit trace to th...

Page 59: ...he communication board FC FC Field Connected BUS BACnet MSTP communication Positive of the VDC typically a fluctuating 1 5 to 3 5 volts reading to COM at least 0 25 volts higher than FC bus BACnet MST...

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