York ZH Series User Manual Download

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R-410A
ZH SERIES W/SMART EQUIPMENT™

3 - 5 Ton

60 Hertz

5167534-YIM-G-0518

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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

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

Optional Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Optional Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Options/Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Economizer Sequences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Dry Bulb Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Single Enthalpy Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Dual Enthalpy Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Auto . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Free Cooling Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Power Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Airflow Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Air Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Checking Air Quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . 46

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

Electric Heating Sequence Of Operations . . . . . . . . . . . . . . . . . . 47

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

Gas Heating Sequence Of Operations . . . . . . . . . . . . . . . . . . . . 49

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

Start-Up (Cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

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

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

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

Smart Equipment™ Control Board Navigation Components . . . . 54

Start-Up Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

LIST OF TABLES

1 ZH037-061 Unit Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

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

3 ZH037-061 Unit Accessory Weights . . . . . . . . . . . . . . . . . . . . 9

4 ZH037-061 Unit Physical Dimensions . . . . . . . . . . . . . . . . . . 11

5 ZH037-061 Unit Clearances . . . . . . . . . . . . . . . . . . . . . . . . . 11

6 Side Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

7 Left/End Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

8 Control Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

9 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

10 Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

11 Electric Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . . . . 27

12 Gas Pipe Sizing - Capacity of Pipe . . . . . . . . . . . . . . . . . . . . 28

13 Gas Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . . . . . . 29

14 Smart Equipment™ Economizer Board Details . . . . . . . . . . 33

15 Supply Air Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

16 Altitude/Temperature Correction Factors . . . . . . . . . . . . . . . 38

17 Airflow Performance - Side Duct Application . . . . . . . . . . . . 40

18 Airflow Performance - Bottom Duct Application . . . . . . . . . . 41

19 RPM Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

20 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 42

21 Power Exhaust Specifications . . . . . . . . . . . . . . . . . . . . . . . . 42

22 Motor Sheave Datum Diameters. . . . . . . . . . . . . . . . . . . . . . 44

23 Additional Static Resistance . . . . . . . . . . . . . . . . . . . . . . . . . 45

24 Electric Heat Limit Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

25 Electric Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . . 48

26 Gas Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . . . . . 50

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

28 Gas Heat Stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

29 Smart Equipment™ UCB Details . . . . . . . . . . . . . . . . . . . . . 55

30 Cable for FC Buses and SA Buses in Order of Preference . 60

31 Ignition Control Flash Codes . . . . . . . . . . . . . . . . . . . . . . . . . 60

LIST OF FIGURES

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

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

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

4 Predator

Component Location (ZH049 Shown) . . . . . . . . . . 6

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

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

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

8 ZH037-049 Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . 9

9 ZH061 Physical Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . 10

10 ZH037-061 Unit Bottom Duct Openings . . . . . . . . . . . . . . . . 12

11 ZH037-061 Unit Electrical Entry . . . . . . . . . . . . . . . . . . . . . . 13

12 ZH037-061 Unit Side Duct Openings . . . . . . . . . . . . . . . . . . 13

13 ZH037-061 Unit Left/End Duct Opening . . . . . . . . . . . . . . . . 14

14 ZH037-061 Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

15 ZH037-061 Transition Roof Curb . . . . . . . . . . . . . . . . . . . . . 15

16 Side Panels With Hole Plugs . . . . . . . . . . . . . . . . . . . . . . . . 15

17 Return Downflow Plenum With Panel . . . . . . . . . . . . . . . . . 16

18 Discharge Panel In Place . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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

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

21 Field Wiring Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

22 Typical Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

23 Side Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

24 Bottom Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

25 SE-ECO1001-0 Economizer Controller . . . . . . . . . . . . . . . . 33

26 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

27 Altitude/Temperature Correction Factors . . . . . . . . . . . . . . . 38

28 Dry Coil Delta P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

29 Typical Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

30 Typical Two Stage Gas Valve . . . . . . . . . . . . . . . . . . . . . . . 53

31 Typical Single Stage Gas Valve . . . . . . . . . . . . . . . . . . . . . . 54

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

Summary of Contents for ZH Series

Page 1: ...ions 36 16 Altitude Temperature Correction Factors 38 17 Airflow Performance Side Duct Application 40 18 Airflow Performance Bottom Duct Application 41 19 RPM Selection 42 20 Indoor Blower Specificati...

Page 2: ...recautions and codes including ANSI Z223 1 or CSA B149 1 latest edition Improper installation may create a condition where the operation of the product could cause personal injury or property damage I...

Page 3: ...installation on combustible 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...

Page 4: ...ilters Merv 13 4 Coil Guard CG STD Filter 5 2 Pleated Filter CG 6 4 Pleated Filter CG A Std Cabinet E SSD SST Drain Pan R Reverse Drain Pan A No Economizer B Economizer w Barometric RLF D Economizer w...

Page 5: ...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 operation 4 Remove the tooll...

Page 6: ...ate the cooling system down to 0 F when this product is applied in a comfort cooling application for people An economizer is typically included in this type of application When applying this product f...

Page 7: ...until the 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 dimensi...

Page 8: ...le damage with plywood or other suitable material D A C B LEFT FRONT D A C B E F LEFT FRONT X Y LEFT FRONT Table 2 Weights and Dimensions Size Tons Model Weight lbs Center of Gravity 4 Point Load Loca...

Page 9: ...ating Economizer 90 85 Power Exhaust 40 35 Electric Heat1 49 49 Gas Heat2 110 110 1 Weight given is for the maximum heater size available 24KW 2 Weight given is for the maximum number of tube heat exc...

Page 10: ...Johnson Controls Ducted Systems Figure 9 ZH061 Physical Dimensions LEFT A 59 00 C D E F 4 19 27 31 89 00 21 19 11 38 15 38 59 00 15 38 29 69 15 25 FRONT SEE DETAIL B FOR DRAIN LOCATION SEE DETAIL A FO...

Page 11: ...16 15 3 16 6 3 16 42 CABINET 3 126 2 000 3 184 4 727 7 705 14 594 Gas Pipe Inlet Gas Exhaust Vent 5 3 8 3 4 FPT Table 5 ZH037 061 Unit Clearances Direction Distance in Direction Distance in Top1 1 Un...

Page 12: ...it Bottom Duct Openings Bottom condensate drain Bottom 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...

Page 13: ...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 Dot Plugs 5 5 32 31 11 16 2 31 32 18 1 4 Return Air Supply Air A B C D Tab...

Page 14: ...1 Roof Curb Table 7 Left End Duct Dimensions Unit Model Number Dimension in A B C ZH037 30 357 13 365 22 516 ZH049 30 357 13 365 22 516 ZH061 30 357 13 365 22 516 4 5 16 A C B 8 or 14 50 1 2 30 20 20...

Page 15: ...r the bottom of the unit For bottom duct application no duct cover changes are necessary For side duct application remove the side duct covers and install over the bottom duct openings The panels remo...

Page 16: ...tall condensate drain line from the 1 inch NPT female connection on the unit to an open drain Figure 20 Condensate Drain Compressors The scroll compressor used in this product is specifically designed...

Page 17: ...be replaced replacement wire must be of the type shown on the wiring diagram and the same minimum gauge as the replaced wire A disconnect must be utilized for these units Factory installed disconnects...

Page 18: ...he unit nameplate Refer to Electrical Data Table 9 to size power wiring fuses and disconnect switch Power wiring is brought into the unit through the side of the unit or the basepan inside the curb Fi...

Page 19: ...e 22 Typical Control Wiring Table 8 Control Wire Sizes Wire Size Maximum Length1 18 AWG 150 Feet 1 From the unit to the thermostat and back to the unit OCC C RC G Y2 Y1 W2 W1 X R THERMOSTAT TERMINALS...

Page 20: ...30 35 E09 6 8 1 18 9 30 1 37 0 35 40 E15 11 3 2 31 4 45 7 52 6 50 60 E20 15 0 2 41 6 58 5 65 4 60 70 230 11 6 88 0 17 5 2 1 5 2 5 5 0 0 None 21 8 27 3 30 35 E06 6 0 1 14 4 24 5 31 4 30 35 E09 9 0 1 21...

Page 21: ...8 1 18 9 30 1 37 0 35 40 E15 11 3 2 31 4 45 7 52 6 50 60 E20 15 0 2 41 6 58 5 65 4 60 70 230 11 6 88 0 17 5 2 1 5 2 5 5 0 0 None 21 8 27 3 30 35 E06 6 0 1 14 4 24 5 31 4 30 35 E09 9 0 1 21 7 33 6 40 4...

Page 22: ...1 18 9 42 6 49 5 45 50 E15 11 3 2 31 4 58 2 65 1 60 70 E20 15 0 2 41 6 71 0 77 9 80 80 230 11 6 88 0 17 5 2 1 5 2 5 5 10 0 None 31 8 37 3 40 45 E06 6 0 1 14 4 37 0 43 9 40 45 E09 9 0 1 21 7 46 1 52 9...

Page 23: ...1 18 9 42 6 49 5 45 50 E15 11 3 2 31 4 58 2 65 1 60 70 E20 15 0 2 41 6 71 0 77 9 80 80 230 11 6 88 0 17 5 2 1 5 2 5 5 10 0 None 31 8 37 3 40 45 E06 6 0 1 14 4 37 0 43 9 40 45 E09 9 0 1 21 7 46 1 52 9...

Page 24: ...dy state efficiency 81 5 81 81 81 5 81 81 81 81 80 5 No burners 4 4 6 4 4 6 4 6 8 No stages 1 1 1 1 1 1 1 1 1 Temperature Rise Range F 20 50 F 25 65 F 50 80 F 20 50 F 25 65 F 40 70 F 25 65 F 35 65 F 4...

Page 25: ...4 1VL44 1VL40 1VP56 Blower Sheave AK69 AK69 AK56 AK56 AK61 AK74 Belt A47 A47 A47 A47 A47 A51 Motor HP each 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 2 RPM 1725 1725 1725 1725 1725 1725 Frame size 56 56 56 56 56 5...

Page 26: ...cy 81 5 81 81 81 5 81 81 81 81 80 5 No burners 4 4 6 4 4 6 4 6 8 No stages 21 22 22 21 22 22 22 22 22 Temperature Rise Range F 20 50 F 25 65 F 50 80 F 20 50 F 25 65 F 40 70 F 25 65 F 35 65 F 45 75 F G...

Page 27: ...4 1VL44 1VL40 1VP56 Blower Sheave AK69 AK69 AK56 AK56 AK61 AK74 Belt A47 A47 A47 A47 A47 A51 Motor HP each 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 2 RPM 1725 1725 1725 1725 1725 1725 Frame size 56 56 56 56 56 5...

Page 28: ...with locality The value should be checked with the local gas utility Figure 23 Side Entry Gas Piping Figure 24 Bottom Entry Gas Piping NOTE Maximum capacity of pipe in cubic feet of gas per hour base...

Page 29: ...l numbers 1NP0454 or 1NP0455 All LP gas equipment must conform to the safety standards of the National Fire Protection Association Table 13 Gas Heat Minimum Supply Air Size Tons Model Heat Size Supply...

Page 30: ...year For specific troubleshooting and maintenance procedures please refer to the smoke detector s installation instructions which accompanies the unit Motorized Outdoor Damper The Motorized Outdoor Da...

Page 31: ...an system both set points should be set to the same value Free Cooling Four types of free cooling options are available dry bulb changeover single enthalpy dual enthalpy changeover and Auto Dry Bulb C...

Page 32: ...e stage of cooling If the economizer output goes to minimum position and the SAT is less than Economizer Setpoint 1 F the control starts a 12 minute timer to de energize a compressor output If at any...

Page 33: ...mistor MAT parameter reports input status F C 3 65 VDC reading MAT to COM with open circuit Read only use in current control revision IN1 MAT LEDs at left on upper edge of economizer board POWER POWER...

Page 34: ...power exhaust actuator and economizer actuator Connects through circuit trace to 24V IN pin HOT ECON 2 10 VDC output for the Economizer actuator Econ parameter reports output status 0 100 Used to posi...

Page 35: ...egative for the indoor air quality sensor Connects through circuit trace to 24V IN pin COM R 24V 24 VAC hot supplied for the outdoor air quality sensor Connects through circuit trace to 24V IN pin HOT...

Page 36: ...is drawing low amperage has similar suction and discharge pressures or producing a high noise level the scroll is misphased Blower Rotation Check for proper supply air blower rotation If the blower is...

Page 37: ...ity of the air However since the air at 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 correctio...

Page 38: ...iven is at an elevation of 5 000 ft The first step is to convert this static pressure to equivalent sea level conditions Sea level static pressure 0 6 832 0 72 Enter the blower table at 1 400 sCFM and...

Page 39: ...HP exceeds the maximum continuous BHP rating of the 1 5 HP motor The 2 HP motor is required 6 1230 RPM is within the range of the 2 HP drives 7 Using the 2 HP motor and drive 5 turns open will achieve...

Page 40: ...0 70 981 0 81 1044 0 91 1106 1 01 1168 1 10 1231 1 18 1500 673 0 43 741 0 48 807 0 56 872 0 65 936 0 75 999 0 85 1061 0 96 1124 1 06 1186 1 15 1249 1 22 1600 691 0 48 759 0 54 825 0 61 890 0 70 954 0...

Page 41: ...1009 0 85 1071 0 94 1130 1 03 1187 1 12 1240 1 21 1500 697 0 42 763 0 51 830 0 61 896 0 71 961 0 80 1025 0 90 1087 0 99 1146 1 08 1203 1 17 1256 1 26 1600 714 0 47 780 0 57 846 0 66 913 0 76 978 0 86...

Page 42: ...hrs run time is recommended Table 19 RPM Selection Size Tons Model HP Max BHP Motor Sheave Blower Sheave 6 Turns Open 5 Turns Open 4 Turns Open 3 Turns Open 2 Turns Open 1 Turn Open Fully Closed 037 3...

Page 43: ...he variable motor sheave is open 5 Select the correct blower performance table for the unit from Table 18 Tables are presented for side and downflow configuration 6 Determine the unit Measured CFM fro...

Page 44: ...result in substantial changes in static pressure and BHP BHP and AMP draw of the blower motor will increase by the cube of the blower speed Static pressure will increase by the square of the blower sp...

Page 45: ...04 0 00 0 04 0 01 0 01 0 01 0 02 0 02 0 02 1300 0 03 0 01 0 05 0 01 0 01 0 01 0 03 0 03 0 03 1400 0 03 0 03 0 07 0 02 0 02 0 02 0 03 0 03 0 03 1500 0 03 0 04 0 08 0 02 0 02 0 02 0 04 0 04 0 04 1600 0...

Page 46: ...on If the enthalpy of the outdoor air is below the setpoint of the enthalpy controller previously determined Y1 energizes the economizer The dampers will modulate to maintain a constant supply air tem...

Page 47: ...rs in this manner 10 minutes on 5 minutes off The indoor blower is operated throughout the cycle The 5 minute off period is necessary to defrost the indoor coil Low ambient mode always begins with com...

Page 48: ...utomatically The limit switch operates when a high temperature condition caused by inadequate supply air flow occurs thus shutting down the heater and energizing the blower Reset Remove the call for h...

Page 49: ...e ignition attempts the furnace is locked out for one hour The furnace is monitored during this one hour period for unsafe conditions Recycle Operation When a flame is lost after the flame stabilizati...

Page 50: ...or 2 seconds the GV will be de energized the ignition cycle is aborted and the ICB flashes the appropriate code See Table 31 Ignition Control Flash Codes The draft motor is energized until the pressur...

Page 51: ...uilding at full fire At no time should the standby gas pressure exceed 10 5 in or the operating pressure drop below 4 5 in for natural gas units If gas pressure is outside these limits contact the loc...

Page 52: ...s gas furnace has two heat stages Therefore the gas valve has two adjustment screws located under a plastic protective cover The second stage 100 input adjustment screw is adjacent to the HI marking o...

Page 53: ...ove the screws holding each end of the manifold to the manifold supports 3 Disconnect wiring to the gas valves and spark igniter s Remove the manifold gas valve assembly Orifices can now be inspected...

Page 54: ...e Source 1 P N S1 JC MAP1810 OP 3 MAP Gateway Quick Start Guide P N 24 10737 16 4 MAP Gateway Instruction P N 24 10737 8 For more information on the Smart Equipment unit control board navigation refer...

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: ...ntact 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: ...hrough 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 the...

Page 59: ...ected 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 MSTP communication circuit FC FC Field Con...

Page 60: ...2 AWG stranded shielded cable A 22 gauge cable offers the best performance for various baud rates cable distances and number of trunk devices primarily due to lower conductor to conductor capacitance...

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