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York ZF Series Installation Manual

R-410a 15 ton/53 kw 50 hertz
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R-410A
ZF SERIES
15 Ton/53 KW
50 Hertz
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Power And Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Optional Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Options/Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Economizer Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Dry Bulb Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Single Enthalpy Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Dual Enthalpy Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Auto . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Free Cooling Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1 ZF180 Unit Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 ZF180 Unit Weights Imperial . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 ZF180 Unit Weights Metric . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 ZF180 Unit Accessory Weights Metric . . . . . . . . . . . . . . . . . . 8
5 ZF180 Unit Accessory Weights Imperial . . . . . . . . . . . . . . . . . 8
6 Utilities Entry Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 ZF180 Unit Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 Control Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
10 ZF180 Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
11 Gas Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12 Gas Pipe Sizing - Capacity of Pipe . . . . . . . . . . . . . . . . . . . . 20
13 Gas Heat Minimum Supply Air Imperial . . . . . . . . . . . . . . . . . 20
14 Gas Heat Minimum Supply Air Metric . . . . . . . . . . . . . . . . . . 20
1 ZF180 Component Location . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Unit 6 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Center of Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Unit Dimensions - ZF Cooling Only . . . . . . . . . . . . . . . . . . . . 9
6 Unit Dimensions - ZF Gas Heat . . . . . . . . . . . . . . . . . . . . . . . 9
7 ZF180 Unit Dimensions Rear View . . . . . . . . . . . . . . . . . . . 10
8 ZF180 Unit Dimensions Rain Hood . . . . . . . . . . . . . . . . . . . 11
9 Roof Curb Dimensions (All Models) . . . . . . . . . . . . . . . . . . . 12
10 Roof Curb Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
11 Unit Curb And Applications . . . . . . . . . . . . . . . . . . . . . . . . . . 12
12 Fixed Outdoor Air Damper . . . . . . . . . . . . . . . . . . . . . . . . . . 13
13 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
14 Field Wiring Disconnect - Cooling Unit With/Without Electric
Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
15 Typical Field Wiring 24 Volt Thermostat . . . . . . . . . . . . . . . . 16

TABLE OF CONTENTS

Power Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
ZF180 Side Duct Application . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Air Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . 35
No Outdoor Air Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Cooling Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Electric Heating Sequence Of Operations. . . . . . . . . . . . . . . . 37
Electric Heat Operation Errors . . . . . . . . . . . . . . . . . . . . . . . 37
Gas Heating Sequence Of Operations . . . . . . . . . . . . . . . . . . 38
Gas Heating Operation Errors . . . . . . . . . . . . . . . . . . . . . . . 38
Start-Up (Cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Start-Up (Gas Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Checking Gas Heat Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
LIST OF TABLES
20 RPM Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
21 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 33
22 Power Exhaust Specifications . . . . . . . . . . . . . . . . . . . . . . . . 33
23 Additional Static Resistance Imperial . . . . . . . . . . . . . . . . . . 34
24 Additional Static Resistance Metric . . . . . . . . . . . . . . . . . . . . 34
25 Limit Control Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
26 Electric Heat Anticipator Setpoint . . . . . . . . . . . . . . . . . . . . . 38
27 Gas Heat Limit Control Setting . . . . . . . . . . . . . . . . . . . . . . . 40
28 Gas Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . . . . . 40
29 Gas Rate Cubic Feet Per Hour . . . . . . . . . . . . . . . . . . . . . . . 41
30 Smart Equipment™ UCB Details . . . . . . . . . . . . . . . . . . . . . 43
LIST OF FIGURES
18 Vent and Combustion Air Hood . . . . . . . . . . . . . . . . . . . . . . 22
19 SE-ECO1001-0 Economizer Controller . . . . . . . . . . . . . . . . 24
20 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
24 Gas Valve Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
27 Gas Valve and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
28 Proper Pilot Flame Adjustment . . . . . . . . . . . . . . . . . . . . . . 42
29 Typical Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
30 Typical Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
31 Unit Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
32 Start-Up & Service Data Instruction . . . . . . . . . . . . . . . . . . . 49
5326601-XIM-A-0117

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Summary of Contents for York ZF Series

  • Page 1: Table Of Contents

    R-410A ZF SERIES 15 Ton/53 KW 50 Hertz TABLE OF CONTENTS General ..........2 Power Exhaust .

  • Page 2: General

    5326601-XIM-A-0117 General ® YORK Model ZF units are either single package air conditioners or single package gas-fired central heating Before performing service or maintenance operations on furnaces with cooling unit. Both are designed for outdoor unit, turn off main power switch to unit. Electrical shock installation on a rooftop or slab.
  • Page 3 Wear safety glasses and work gloves. Use quenching cloth and Renewal Parts have a fire extinguisher available during brazing operations. ® Contact your local York parts distribution center for authorized replacement parts. Inspection As soon as a unit is received, it should be inspected for possible Approvals damage during transit.
  • Page 4 5326601-XIM-A-0117 Nomenclature ® 15 Ton York 50 Hz. Model Number Nomenclature Z F 180 C A 7 A 1 Product Generation Product Category 1 = First Generation Z = A/C, Single Pkg., R-410A Cabinet Options Product Identifier A = Std Cabinet...

  • Page 5: Installation

    5326601-XIM-A-0117 Installation Limitations These units must be installed in accordance with the following: Installation Safety Information Local Government/Agency regulations. Read these instructions before continuing this appliance installation. This is an outdoor combination heating and cooling Refer to unit application data found in this document. unit.

  • Page 6: Zf180 Unit Limitations

    5326601-XIM-A-0117 HIGH EFFICIENCY COPPER TUBE/ALUMINUM FIN 20 GAUGE COMPRESSORS CONDENSER COILS ALUMINIZED STEEL TUBULAR HEAT EXCHANGERS LONG LASTING POWDER PAINT FINISH ELECTRICAL DISCONNECT MOUNTING LOCATION (Field installed) KNOCKOUT FOR SIDE CONTROL WIRING ENTRY KNOCKOUT FOR SIDE 2" DISPOSABLE POWER WIRING FILTERS ENTRY SIDE POWER VENTOR MOTOR...

  • Page 7: Location

    If a unit is to be installed on a roof curb other than a ® York roof curb, gasketing must be applied to all surfaces that come in contact with the unit underside. Excessive exposure of this furnace to contaminated combustion air may result in equipment damage or personal injury.

  • Page 8: Zf180 Unit Weights Imperial

    5326601-XIM-A-0117 FRONT FRONT Figure 2: Unit 4 Point Load Weight Figure 3: Unit 6 Point Load Weight FRONT LEFT Figure 4: Center of Gravity Table 2: ZF180 Unit Weights Imperial Weight (lbs.) Center of Gravity 4 Point Load Location (lbs.) 6 Point Load Location (lbs.) Size Model...

  • Page 9: Unit Dimensions - Zf Cooling Only

    5326601-XIM-A-0117 1235 (48-5/8") 3181 (125-1/4") 616 (24-1/4") RETURN AIR SUPPLY AIR OUTDOOR AIR (Discharge) OUTDOOR AIR (Economizer) Figure 5: Unit Dimensions - ZF Cooling Only 1235 (48-5/8") 3181 (125-1/4") 616 (24-1/4") RETURN AIR SUPPLY AIR OUTDOOR AIR (Discharge) OUTDOOR AIR (Economizer) Figure 6: Unit Dimensions - ZF Gas Heat Johnson Controls Unitary Products...

  • Page 10: Utilities Entry Data

    5326601-XIM-A-0117 Table 6: Utilities Entry Data OPENING SIZE HOLE USED FOR (DIA.) (MM/IN.) 29/1-1/8” KO Side Control Wiring 19/3/4” NPS (Fem.) Bottom 92/3-5/8” KO Side Power Wiring 76/3” NPS (Fem.) Bottom 60/2-3/8” KO Gas Piping (Front) 43/1-11/16” Hole Gas Piping (Bottom) 1.

  • Page 11: Zf180 Unit Clearances

    5326601-XIM-A-0117 ECONOMIZER MOTORIZED DAMPER POWER EXHAUST SUPPLY AIR RAIN HOOD RAIN HOOD COMPARTMENT ECONOMIZER / MOTORIZED DAMPER (on Outdoor Air Compartment) (on Return Air Compartment) AND POWER EXHAUST RAIN HOODS FIXED OUTDOOR AIR INTAKE HOOD (located on Return Air Compartment) (36-5/8”) 25 (1“) CONDENSATE DRAIN...

  • Page 12: Ductwork

    5326601-XIM-A-0117 * Supply and Return air (including duct support rails) as shown, are typical for Downflow duct applications For location of Sideflow duct applica- tions (on back of unit), refer to Unit Dimension details. Figure 9: Roof Curb Dimensions (All Models) Figure 10: Roof Curb Benefits Figure 11: Unit Curb And Applications Ductwork...

  • Page 13: Condensate Drain

    5326601-XIM-A-0117 Fixed Outdoor Air Intake Damper This damper is shipped inside the return air compartment. It is completely assembled and ready for installation. A damper Side Supply baffle inside of the hood is adjustable to provide variable Air Access amounts of outdoor air intake on units that are not provided with Panel an economizer or a motorized damper option.

  • Page 14: Filters

    A disconnect must be utilized for these units. Factory installed disconnects are available. If installing a disconnect (field ® supplied or York International supplied accessory), refer to Exposure, even if immediately cleaned up, may cause Figure 1 for the recommended mounting location.

  • Page 15: Control Wire Sizes

    5326601-XIM-A-0117 TERMINAL BLOCK TB1 FACTORY OR FIELD GROUND SUPPLIED DISCONNECT THREE PHASE POWER SUPPLY Figure 14: Field Wiring Disconnect - Cooling Unit With/Without Electric Heat Thermostat Wiring Space Sensor The thermostat should be located on an inside wall approximately The space sensor, if used, should be located on an inside wall 56 inch above the floor where it will not be subject to drafts, sun approximately 56 inches above the floor where it will not be exposure or heat from electrical fixtures or appliances.

  • Page 16: Typical Field Wiring 24 Volt Thermostat

    5326601-XIM-A-0117 CONTROL TERMINAL THERMOSTAT BLOCK TERMINALS SD-24 Smoke Detector 24 VAC Class 2 SD-24 Jumper Located on Harness TERMINALS ON A (If Smoke Detector Is Used) (If No Smoke Detector) LIMITED NUMBER OF THERMOSTATS SD-R 24V Output Second stage ot required on single stage he g units.

  • Page 17: Electrical Data

    5326601-XIM-A-0117 Table 9: Electrical Data ZF180 - Standard Drive Compressors OD Fan Supply (each) Max Fuse Motors Blower Conv Electric Heat Option Size Breaker (each) Motor Outlet Volt (Tons) (Amps) Size (Amps) C1 C2 Model Stages Amps 380-3-50 16.7 111 101 26 20.3 NONE 44.4...

  • Page 18: Zf180 Physical Data

    5326601-XIM-A-0117 Table 10: ZF180 Physical Data Models Component ZF180 Nominal Tonnage Brand YORK Country of Origin Made in USA Rated Voltage Range 380-415 Volts Rated Frequency 50Hz Nominal CFM 6000 Rated Cooling Capacity (T1) - BTUH 204831 Rated Power Input (T1) - KW 17.92...
  • Page 19 5326601-XIM-A-0117 Table 10: ZF180 Physical Data (Continued) Models Component ZF180 Nominal Tonnage CONDENSER FAN DATA Quantity Fan diameter (Inch) Type Prop Drive type Direct No. speeds Number of motors Motor HP each 1.25 Nominal total CFM 6000 BELT DRIVE EVAP FAN DATA Quantity Fan Size (Inch) 15 X 15...

  • Page 20: Optional Gas Heat

    5326601-XIM-A-0117 Optional Gas Heat Table 12: Gas Pipe Sizing - Capacity of Pipe Nominal Iron Pipe Size Length of These gas-fired heaters have aluminized-steel or optional Pipe ft. (m) 1 in. 1-1/4 in. stainless steel, tubular heat exchangers with spark ignition with proven pilot.
  • Page 21 5326601-XIM-A-0117 All piping should be cleaned of dirt and scale by For satisfactory operation, LP gas pressure must be 10.0 inch hammering on the outside of the pipe and blowing out W.C. at the unit under full load. Maintaining proper gas loose particles.

  • Page 22: Options/Accessories

    5326601-XIM-A-0117 Each vent hood is installed by inserting the top flange of the Four types of free cooling options are available: dry bulb hood into the slotted opening in the access panel and securing changeover, single enthalpy, dual enthalpy changeover, and in place.

  • Page 23: Power Exhaust

    5326601-XIM-A-0117 If the thermostat provides an input to Y2 and the parameter If the demand for cooling from the space/return is satisfied, the Compressors Off in Free Cooling is turned OFF a compressor economizer output will modulate to minimum position and the output energizes.

  • Page 24: Smart Equipment™ Economizer Board Details

    5326601-XIM-A-0117 Figure 19: SE-ECO1001-0 Economizer Controller Table 15: Smart Equipment™ Economizer Board Details Board Cover Description Function & Comments Label Label Directional orientation: viewed with the center text of the cover label upright ANALOG INPUTS Terminal at left on upper edge of economizer board 24 VAC common/0-10 VDC negative for Connects through circuit trace to 24V~ IN pin COM economizer actuator position feedback...
  • Page 25 5326601-XIM-A-0117 Table 15: Smart Equipment™ Economizer Board Details (Continued) Board Cover Description Function & Comments Label Label SA BUS Pin connections at left on upper edge of economizer board EconCtrlr parameter reports UCB-to-economizer board SA bus communication status. Negative of the SA BUS communication Common for SA BUS power and circuit to the UCB.
  • Page 26 5326601-XIM-A-0117 Table 15: Smart Equipment™ Economizer Board Details (Continued) Board Cover Description Function & Comments Label Label 24V~ IN Pin connections at right on upper edge of economizer board 24 VAC common connection to power the economizer board. 24 VAC transformer Common referenced to Connects through circuit traces to C/COM terminals and pins cabinet ground distributed on the economizer board.

  • Page 27: Belt Adjustment

    Phasing Belt Tension ® York Model ZF units are properly phased at the factory. Check The tension on the belt should be adjusted as shown in Figure 20. for proper compressor rotation. If the blower or compressors rotate in the wrong direction at start-up, the electrical connection to the unit is misphased.

  • Page 28: Altitude/Temperature Correction Factors Imperial

    5326601-XIM-A-0117 CFM Static Pressure and Power-Altitude and Temperature Corrections The information below should be used to assist in application of Procedure for adjusting belt tension: product when being applied at altitudes at or exceeding 1000 feet above sea level. 1. Loosen six nuts (top and bottom) A. 2.

  • Page 29: Altitude/Temperature Correction Factors Imperial

    5326601-XIM-A-0117 1.100 1.050 1.000 Sea Level 0.950 1000 ft 0.900 2000 ft 3000 ft 0.850 4000 ft 0.800 5000 ft 6000 ft 0.750 7000 ft 8000 ft 0.700 9000 ft 10000 ft 0.650 0.600 Air Temperature (ºF) Figure 21: Altitude/Temperature Correction Factors Imperial 1.100 1.050 1.000...
  • Page 30 5326601-XIM-A-0117 Corrected static pressure = 1.5 x 0.832 = 1.248 IWC The 1.5" static pressure given is at an elevation of 5,000 ft. The first step is to convert this static pressure to equivalent sea level Corrected BHP = 4.0 x 0.832 = 3.328 conditions.

  • Page 31: Zf180 Side Duct Application

    5326601-XIM-A-0117 Table 18: Air Flow Performance - Side Duct Application ZF180 Side Duct Application ZF180 (15 Ton) Side Duct Imperial Available External Static Pressure - IWG Air Flow (CFM) RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP High Static 4.0 HP &...

  • Page 32: Air Flow Performance - Bottom Duct Application

    5326601-XIM-A-0117 Table 19: Air Flow Performance - Bottom Duct Application ZF180 (15 Ton) Bottom Duct Imperial Available External Static Pressure - IWG Air Flow (CFM) RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP High Static 4.0 HP &...

  • Page 33: Air Balance

    5326601-XIM-A-0117 Table 20: RPM Selection Size Motor Blower 6 Turns 5 Turns 4 Turns 3 Turns 2 Turns 1 Turn Fully Model Max BHP (Tons) Sheave Sheave Open Open Open Open Open Open Closed 4.72 1VP62 BK75 1009 1051 1093 1135 (15) * Maximum blower speed is 1400 RPM for ZF180...

  • Page 34: Additional Static Resistance Imperial

    5326601-XIM-A-0117 of both the supply and the return air duct systems. With this Note the following: information, the RPM for the supply air blower and the motor The supply air CFM must be within the limitations shown in pulley adjustment (turns open) can be determined from the the Blower Performance Tables 18 and 19.

  • Page 35: Sequence Of Operation

    5326601-XIM-A-0117 Sequence Of Operation When the thermostat calls for the second stage of cooling, the low-voltage control circuit from “R” to “Y2” is completed. Cooling Sequence Of Operation Compressor #2 is energized, provided it has not been locked out, and condenser fan motor #1, and condenser fan motor #2 NOTE: For more in-depth sequence of operation of the Smart remain energized.

  • Page 36: Cooling Operation Errors

    5326601-XIM-A-0117 Economizer With Power Exhaust compressor is idle, stop the condenser fans. If the LPS is still open after the ASCD, the compressor will not be energized for A unit equipped with an economizer (single or dual enthalpy) 30 seconds. The second and third times that the UCB sees an and a power exhaust operates as specified above with one open LPS will count towards the three occurrences that will addition.

  • Page 37: Electric Heating Sequence Of Operations

    5326601-XIM-A-0117 Safety Controls Two-stage heating: (applies to all heaters except 18 KW) a. Upon a call for first-stage heat by the thermostat, the The unit control board monitors the following inputs for each heater contactor (M6) will be energized. After completing cooling system: the specified fan on delay for heating, the UCB will An evaporator low limit sensor (EC1, 2) (Located on the...

  • Page 38: Gas Heating Sequence Of Operations

    5326601-XIM-A-0117 Reset the UCB. Heat relay “RW2” is energized. The “RW2-1” contact is closed energizing the second stage ignition module “IC2”. Remove the call for heating by lowering the thermostat setting “IC2” will immediately start the second stage igniter sparking lower than the conditioned space temperature.

  • Page 39: Gas Heat Limit And Auxiliary Location Down Discharge

    5326601-XIM-A-0117 This limit is monitored regardless of unit operation status, i.e. this limit is monitored at all times. If the temperature limit opens three times within one hour, it will lock-on the indoor blower motor. Gas Valve The UCB continuously monitors the GV. Any time the UCB senses voltage at the GV without a call for heat for a continuous five-minute period, the UCB will lock-on the indoor blower.

  • Page 40: Start-Up (Cooling)

    5326601-XIM-A-0117 signal from the flame sensor indicating the pilot flame is temperature swing in the conditioned space. Reducing the properly ignited, then the main gas valve will not open. It will value below the correct setpoint will give shorter “ON cycles continue to try and ignite the pilot for a maximum of 85 seconds, and may result in the lowering of the temperature within the then if the pilot flame is not detected, the ignition control will...

  • Page 41: Start-Up (Gas Heat)

    5326601-XIM-A-0117 Start-Up (Gas Heat) units. If gas pressure is outside these limits, contact the local gas utility or propane supplier for corrective action. Pre-Start Check List Shut Down Complete the following checks before starting the unit. Check the type of gas being supplied. Be sure that it is the Set the thermostat to the lowest temperature setting.

  • Page 42: Proper Pilot Flame Adjustment

    5326601-XIM-A-0117 Manifold Gas Pressure Adjustment Pilot Checkout The pilot flame should envelope the end of the flame sensor. To Small adjustments to the high-fire gas flow may be made by adjust pilot flame, (1) remove pilot adjustment cover screw, (2) turning the pressure regulator adjusting screw on the automatic increase or decrease the clearance for air to the desired level, gas valve.

  • Page 43: Smart Equipment™ Ucb Details

    5326601-XIM-A-0117 THERMOSTAT WIRED HERE SD-24 Figure 31: Unit Control Board Table 30: Smart Equipment™ UCB Details Description Function & Comments Terminal Directional orientation: viewed with silkscreen labels upright Limit, 24 VAC power and shutdown connections from unit wiring harness at left on upper edge of UCB Monitored 24 VAC input through heat section limit If voltage is absent, indicating the heat section is over- LIMIT...
  • Page 44 5326601-XIM-A-0117 Table 30: Smart Equipment™ UCB Details (Continued) Description Function & Comments Terminal Thermostat connection strip on left edge of UCB 1st stage heating request, 24 VAC input switched Not effective for cooling-only units from R 2nd stage heating request, 24 VAC input switched Not effective for cooling-only units or units with single-stage from R heat sections...
  • Page 45 5326601-XIM-A-0117 Table 30: Smart Equipment™ UCB Details (Continued) Description Function & Comments Input required for operation; 3.625 VDC reading RAT+ to RAT– Return Air Temperature sensor input from 10KΩ with open circuit. Used in return air enthalpy calculation. RAT+ @ 77°F, Type III negative temperature coefficient Substitutes for space temperature if no other space thermistor temperature input is present.
  • Page 46 5326601-XIM-A-0117 Table 30: Smart Equipment™ UCB Details (Continued) Description Function & Comments Terminal at lower right corner of UCB Output relay circuitry is isolated from other UCB components 24 VAC hot for H1, H2, CN-FAN, AUX HGR, FAN 24V FOR OUTPUTS and the 24 VAC hot source may be from a second transformer C1 and C2 output relay contact switching in the unit...
  • Page 47 5326601-XIM-A-0117 Table 30: Smart Equipment™ UCB Details (Continued) Description Function & Comments Not effective for one stage compressor UCBs. Input is only considered if C2 output is needed; input must be present to HPS2 24 VAC hot return from refrigerant circuit 2 High allow C1 output.
  • Page 48 5326601-XIM-A-0117 Table 30: Smart Equipment™ UCB Details (Continued) Description Function & Comments Factory wired SA Bus connector Optional communication sub-board at center of UCB Terminal FC BUS connections on left edge of the communication board Positive of the VDC (typically, a fluctuating 1.5 to 3.5 volts FC (“Field Connected”) BUS BACnet MSTP reading to COM;...

  • Page 49: Start-Up & Service Data Instruction

    5326601-XIM-A-0117 Figure 32: Start-Up & Service Data Instruction Johnson Controls Unitary Products...
  • Page 50 5326601-XIM-A-0117 Johnson Controls Unitary Products...
  • Page 51 5326601-XIM-A-0117 Johnson Controls Unitary Products...
  • Page 52 5326601-XIM-A-0117 Johnson Controls Unitary Products...
  • Page 53 5326601-XIM-A-0117 Johnson Controls Unitary Products...
  • Page 54 Subject to change without notice. Printed in U.S.A. 5326601-XIM-A-0117 Copyright © 2018 by Johnson Controls, Inc. All rights reserved. Supersedes: Nothing York International Corporation 5005 York Drive Norman, OK 73069...

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