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R-410A
XA SERIES W/SMART EQUIPMENT™
15/20 Ton
60 Hertz
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Power And Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 14
Field Installed Electric Heat Accessories . . . . . . . . . . . . . 22
Options/Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Economizer Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Dry Bulb Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Single Enthalpy Changeover. . . . . . . . . . . . . . . . . . . . . . . 23
Dual Enthalpy Changeover . . . . . . . . . . . . . . . . . . . . . . . . 23
Auto. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Free Cooling Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Power Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1 XA-15, XA-20 Unit Limitations . . . . . . . . . . . . . . . . . . . . . . 6
2 XA-15, XA-20 Unit Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 XA-15, XA-20 Unit Accessory Weights . . . . . . . . . . . . . . . 9
4 XA-15, XA-20 Unit Clearances . . . . . . . . . . . . . . . . . . . . 12
5 Control Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 XA-15, XA-20 Physical Data . . . . . . . . . . . . . . . . . . . . . . 21
8 Electric Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . 22
9 Smart Equipment™ Economizer Board Details . . . . . . . 25
10 Altitude/Temperature Correction Factors . . . . . . . . . . . . 30
1 XA-20 Component Location . . . . . . . . . . . . . . . . . . . . . . . 6
2 XA-20 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . 8
3 XA-20 Unit 6 Point Load Weight . . . . . . . . . . . . . . . . . . . 8
4 XA-15 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . 8
5 XA-15 Unit 6 Point Load Weight . . . . . . . . . . . . . . . . . . . 8
6 Center of Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 XA-20 Unit Dimensions Front View . . . . . . . . . . . . . . . . . 9
8 XA-15 Unit Dimensions Front View . . . . . . . . . . . . . . . . 10
9 XA-15, XA-20 Unit Dimensions Rear View . . . . . . . . . . 11
10 XA-15, XA-20 Unit Dimensions Rain Hood . . . . . . . . . . 12
11 XA-15, XA-20 Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . 12
12 Fixed Outdoor Air Damper . . . . . . . . . . . . . . . . . . . . . . . 13
TABLE OF CONTENTS
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Damper Set Point Adjustment . . . . . . . . . . . . . . . . . . . . . . 28
Air Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . 36
Cooling Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . 36
Electric Heating Sequence Of Operations. . . . . . . . . . . . . 37
Defrost Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Interval between Defrosts. . . . . . . . . . . . . . . . . . . . . . . . 38
Forced Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Electric Heat Operation Errors . . . . . . . . . . . . . . . . . . . . 38
Start-Up (Cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Charging The Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Normal Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Blower Shaft Bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Outdoor Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Start-Up Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
LIST OF TABLES
11 Air Flow Performance - Side Duct Application . . . . . . . . 32
12 Air Flow Performance - Bottom Duct Application . . . . . . 33
13 RPM Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
14 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . . 34
15 Power Exhaust Specifications . . . . . . . . . . . . . . . . . . . . . 34
16 Additional Static Resistance . . . . . . . . . . . . . . . . . . . . . . 35
17 Limit Control Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
18 Electric Heat Anticipator Setpoint . . . . . . . . . . . . . . . . . . 39
19 Smart Equipment™ UCB Details . . . . . . . . . . . . . . . . . . 42
LIST OF FIGURES
13 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
15 Typical Field Wiring 24 Volt Thermostat . . . . . . . . . . . . 16
16 SE-ECO1001-0 Economizer Controller . . . . . . . . . . . . . 25
17 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
18 Altitude/Temperature Correction Factors . . . . . . . . . . . . 30
For All Unit Tonnages . . . . . . . . . . . . . . . . . . . . . . . . . . 34
20 XA-15 (15 Ton) Charging Chart . . . . . . . . . . . . . . . . . . . 40
21 XA-20 (20 Ton) Charging Chart . . . . . . . . . . . . . . . . . . . 40
22 Unit Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5168274-BIM-I-1121
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Table of Contents
Related Manuals for York XA Series
Summary of Contents for York XA Series
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Page 1: Table Of Contents
R-410A XA SERIES W/SMART EQUIPMENT™ 15/20 Ton 60 Hertz TABLE OF CONTENTS General ......... . 2 Operation . -
Page 2: General
5168274-BIM-I-1121 General Ducted Systems Model XA units are single package Heat Pump with electric heaters (Field Installed Accessory Only). Designed Before performing service or maintenance operations on for outdoor installation on a rooftop or slab. unit, turn off main power switch to unit. Electrical shock could cause personal injury. - Page 3 5168274-BIM-I-1121 Reference For outdoor installation only. For installation on combustible material.. Additional information is available in the following reference forms: • Technical Guide - XA-15/XA-20, 5168281 • General Installation - XA-15/XA-20, 5168274 • Electric Heat Accessory Installation - 5128261 Improper installation may create a condition where the •...
- Page 4 5168274-BIM-I-1121 Nomenclature 15 & 20 Ton Model Number Nomenclature X A -15 C A 2 A 1 Product Generation Product Category 1 = First Generation X = HP, Single Pkg., R-410A Cabinet Options Product Identifier A = Std Cabinet B = HFD (Hinged FLTR/Toolless DR) A = Pkg HP Std Eff C = HCD (Hinged &...
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Page 5: Installation
5168274-BIM-I-1121 Installation Local building codes, and Local electric utility requirements Installation Safety Information In Canada: Read these instructions before continuing this appliance Canadian Electrical Code, CSA C22.1 installation. This is an outdoor combination heating and cooling Installation Codes, CSA - B149.1. unit. -
Page 6: Unit Limitations
5168274-BIM-I-1121 Smart Equipment™ Control Board Slide In/ Plug In Internal Economizer 110 Volt Convenience (Optional) Outlet (“Powered” or “Non-Powered” Optional) 2” Disposable Filters (4” Filters Optional) Disconnect Location (Optional Disconnect Switch) Bottom Power and Control Wiring Entry Electric Heater Location (Electric Heat Offered as a Field-Installed Accessory Only) Belt Drive Blower Motor... -
Page 7: Location
5168274-BIM-I-1121 Location Rigging And Handling Use the following guidelines to select a suitable location for Exercise care when moving the unit. Do not remove any these units: packaging until the unit is near the place of installation. Rig the unit by attaching chain or cable slings to the lifting holes Unit is designed for outdoor installation only. -
Page 8: Unit Weight
5168274-BIM-I-1121 Figure 2: XA-20 Unit 4 Point Load Weight Figure 3: XA-20 Unit 6 Point Load Weight Figure 4: XA-15 Unit 4 Point Load Weight Figure 5: XA-15 Unit 6 Point Load Weight FRONT FRONT FRONT LEFT Figure 6: Center of Gravity Table 2: XA-15, XA-20 Unit Weight Size Weight (lbs.) -
Page 9: Unit Accessory Weights
5168274-BIM-I-1121 Table 3: XA-15, XA-20 Unit Accessory Weights Weight (lbs.) Unit Accessory Shipping Operating Economizer Power Exhaust Electric Heat Double Wall Motorized Damper Barometric Damper Econ./Motorized Damper Rain Hood Econ./Power Exhaust Rain Hood Wood Skid Roof Curb 1. Weight given is for the maximum heater size available (72KW). -
Page 10: Unit Dimensions Front View
5168274-BIM-I-1121 ECONOMIZER / MOTORIZED DAMPER, FIXED OUTDOOR INTAKE AIR AND FIELD-SUPPLIED POWER EXHAUST RAIN HOODS DISCONNECT SWITCH (See detail "Y") BLOWER LOCATION COMPRESSOR ACCESS ACCESS (See detail "X") BLOWER MOTOR ACCESS OPTIONAL COIL BLOWER GUARD KIT COMPARTMENT ACCESS (Auxiliary) - / " DOT PLUG (For pressure Drop Reading) -
Page 11: Unit Dimensions Rear View
5168274-BIM-I-1121 EVAPORATOR SECTION DOT PLUG (For pressure 40-3/8" drop reading) FILTER ACCESS SUPPLY RETURN COMPRESSOR OUTDOOR ACCESS 40-1/2" SUPPLY AIR 18-5/8" ACCESS 1" NPT FEMALE 27-3/4" COND. DRAIN Dimensions listed are for side CONNECTION 5-1/8" RETURN AIR duct flange openings; see ACCESS OUTDOOR AIR Field Accessories for Side... -
Page 12: Unit Clearances
5168274-BIM-I-1121 Economizer Motorized Power Exhaust Damper Rain Hood Rain Hood Supply Air (on Outdoor (on Return Compartment Air Compartment) Economizer/Motorized Damper Air Compartment) and Power Exhaust Rain Hood Fixed Outdoor Air Intake Hood (Located on 36-5/8” Return Air 1” Condensate Compartment) Drain (Must be 16-1/8”... -
Page 13: Ductwork
5168274-BIM-I-1121 Ductwork hood flanges as a template, drill 9/64 inch diameter (#26 drill) holes into the ductwork and secure with the screws provided. Ductwork should be designed and sized according to the methods in Manual D of the Air Conditioning Contractors of America (ACCA) or as recommended by any other recognized authority such as ASHRAE or SMACNA. -
Page 14: Compressors
5168274-BIM-I-1121 Compressors coil and must be kept clean or replaced with same size and type. Dirty filters will reduce the capacity of the unit and will The scroll compressor used in this product is specifically result in frosted coils or safety shutdown. Minimum filter area designed to operate with R-410A Refrigerant and cannot be and required sizes are shown in Physical Data Table 7. -
Page 15: Control Wire Sizes
5168274-BIM-I-1121 Refer to Figures 14 and 15 for typical field wiring and to the Power Wiring Detail appropriate unit wiring diagram mounted inside control doors Units are factory wired for the voltage shown on the unit for control circuit and power wiring information. nameplate. -
Page 16: Typical Field Wiring 24 Volt Thermostat
5168274-BIM-I-1121 R~Occ Jumper: CONTROL TERMINAL Smart Equipment Control boards come from the THERMOSTAT BLOCK TERMINALS factory with a jumper wire between R and OCC terminals on the thermostat terminal strip. Failure to remove this jumper will place the unit into the Occupied mode no matter what the occupancy demand is from the thermostat or EMS system. -
Page 17: Electrical Data
5168274-BIM-I-1121 Table 6: Electrical Data XA-15, XA-20 - Standard Drive Without Powered Convenience Outlet OD Fan Supply Max Fuse Compressors Electric Heat Motors Blower Conv Size Breaker (each) (Field Installed Accessory Only) Volt (each) Motor Outlet (Tons) (Amps) Size (Amps) RLA LRA MCC Model Stages... - Page 18 5168274-BIM-I-1121 XA-15, XA-20 - Standard Drive With Powered Convenience Outlet OD Fan Supply Max Fuse Compressors Electric Heat Motors Blower Conv Size Breaker (each) (Field Installed Accessory Only) Volt (each) Motor Outlet (Tons) (Amps) Size (Amps) RLA LRA MCC Model Stages Amps NONE 13.5...
- Page 19 5168274-BIM-I-1121 XA-15, XA-20 - High Static Drive Without Powered Convenience Outlet OD Fan Supply Max Fuse Compressors Electric Heat Motors Blower Conv Size Breaker (each) (Field Installed Accessory Only) Volt (each) Motor Outlet (Tons) (Amps) Size (Amps) RLA LRA MCC Model Stages Amps...
- Page 20 5168274-BIM-I-1121 XA-15, XA-20 - High Static Drive With Powered Convenience Outlet OD Fan Supply Max Fuse Compressors Electric Heat Motors Blower Conv Size Breaker (each) (Field Installed Accessory Only) Volt (each) Motor Outlet (Tons) (Amps) Size (Amps) RLA LRA MCC Model Stages Amps...
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Page 21: Physical Data
5168274-BIM-I-1121 Table 7: XA-15, XA-20 Physical Data Models Component XA-15 XA-20 Nominal Tonnage AHRI COOLING PERFORMANCE Gross Capacity @ AHRI A point (Btu/hr) 181,600 261,400 AHRI net capacity (Btu/hr) 176,000 240,000 10.6 IEER with Constant Volume 11.8 IEER with Intellispeed 13.2 Nominal CFM 5500... -
Page 22: Field Installed Electric Heat Accessories
5168274-BIM-I-1121 Table 7: XA-15, XA-20 Physical Data (Continued) Models Component XA-15 XA-20 Nominal Tonnage Type Centrifugal Centrifugal Motor Sheave 1VP60 1VP60 1VP60 1VP60 Blower Sheave BK120 BK100 BK110 BK090 Belt BX81 BX78 BX78 BX75 Motor HP each 1750 1750 1750 1760 Frame size 184T... -
Page 23: Single Enthalpy Changeover
5168274-BIM-I-1121 Free cooling is no longer available if the outside air temperature needed to keep the supply air temperature within the 5°F of the rises above either the Economizer OAT Enable setpoint or the economizer setpoint. return air temperature. Sensor Single Enthalpy Changeover In free cooling, with a demand from the zone/return sensor for the first stage of cooling, the dampers modulate to control the... -
Page 24: Operation
5168274-BIM-I-1121 b. 24 VAC from EX-FAN to energize exhaust fan on Economizer Expansion module Operation Operation details include: a. Compares economizer output to the Economizer Damper Position For Exhaust Fan On and OFF. b. Energizes exhaust fan when economizer output is above Economizer Damper Position For Exhaust Fan On. -
Page 25: Smart Equipment™ Economizer Board Details
5168274-BIM-I-1121 Figure 16: SE-ECO1001-0 Economizer Controller Table 9: 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 26 5168274-BIM-I-1121 Table 9: Smart Equipment™ Economizer Board Details (Continued) Board Cover Description Function & Comments Label Label EconCtrlr parameter reports UCB-to-economizer board SA BUS communication status. Positive of the VDC (typically, a fluctuating 1.5 to 3.5 volts reading to C; at least 0.25 volts lower –...
- Page 27 5168274-BIM-I-1121 Table 9: Smart Equipment™ Economizer Board Details (Continued) Board Cover Description Function & Comments Label Label 24 VAC hot connection to power the economizer board. 24 VAC transformer HOT Connects through circuit traces to R/24V~ terminals and pins distributed on the economizer board. ANALOG INPUTS Terminal on lower edge of economizer board 24 VAC hot supplied for the outdoor air 24V~...
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Page 28: Field Installed Bas-Ready Economizer Power Exhaust Damper Set Point Adjustment
5168274-BIM-I-1121 Table 9: Smart Equipment™ Economizer Board Details (Continued) Board Cover Description Function & Comments Label Label 24 VAC common/0-5 VDC negative for the Connects through circuit trace to 24V~ IN pin COM building pressure sensor BINARY INPUTS at right on lower edge of economizer board Purge parameter reports input status (False with 0 VAC input- True with 24 VAC input). -
Page 29: Belt Adjustment
5168274-BIM-I-1121 Phasing Ducted Systems Model XA units are properly phased at the factory. Check for proper compressor rotation. If the blower or compressors rotate in the wrong direction at start-up, the Procedure for adjusting belt tension: electrical connection to the unit is misphased. Change the 1. -
Page 30: Altitude/Temperature Correction Factors
5168274-BIM-I-1121 Table 10: Altitude/Temperature Correction Factors Altitude (Ft.) Temp. 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 1.060 1.022 0.986 0.950 0.916 0.882 0.849 0.818 0.788 0.758 0.729 1.039 1.002 0.966 0.931 0.898 0.864 0.832 0.802 0.772 0.743 0.715 1.019 0.982... - Page 31 5168274-BIM-I-1121 Drive Selection Determine side or bottom supply duct application. Determine desired airflow Calculate or measure the amount of external static pressure. Using the operating point determined from steps 1, 2 & 3, locate this point on the appropriate supply air blower performance table.
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Page 32: Air Flow Performance - Side Duct Application
5168274-BIM-I-1121 Table 11: Air Flow Performance - Side Duct Application XA-15 (15 Ton) Side Duct 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 Standard 5 HP &... -
Page 33: Air Flow Performance - Bottom Duct Application
5168274-BIM-I-1121 Table 12: Air Flow Performance - Bottom Duct Application XA-15 (15 Ton) Bottom Duct 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 Standard 5 HP &... -
Page 34: Air Balance
5168274-BIM-I-1121 Table 13: RPM Selection 5 Turns 4 Turns 3 Turns 2 Turns 1 Turns Fully Size Motor Blower 6 Turns Model (Tons) Sheave Sheave Open Open Open Open Open Open Closed 1VP60 BK120 (15) 1VP60 BK100 1000 1035 1070 1VP60 BK110 (20) -
Page 35: Additional Static Resistance
5168274-BIM-I-1121 NOTE: De-energize the compressors before taking any test For the XA-15 Model, high speed drive accessory 1LD0413 measurements to assure a dry indoor coil. (containing a smaller blower pulley and a shorter belt) is available for applications requiring the supply air blower to Supply Air Drive Adjustment produce higher CFM's and/or higher static pressures. -
Page 36: Sequence Of Operation
5168274-BIM-I-1121 Sequence Of Operation Additionally, the indoor blower has a delay of 10 seconds. Cooling Operation Errors Cooling Sequence Of Operation For XA units, a "Y1" call for the first stage of cooling is passed Each cooling system is monitored for operation outside of the to the Unit Control Board (UCB) which then determines whether intended parameters. -
Page 37: Electric Heating Sequence Of Operations
5168274-BIM-I-1121 Evaporator Low Limit The unit control board monitors the temperature limit switch of electric heat units. During cooling operation, if the Evaporator Low Limit Sensor (EC1, 2) (Located on the Suction Line at the Evaporator Coil.) Compressor Protection detects a temperature below 26 Deg. F (default), the UCB will In addition to the external pressure switches, the compressors de-energize the associated compressor, initiate the ASCD, and, also have inherent (internal) protection. -
Page 38: Defrost Termination
5168274-BIM-I-1121 cannot be energized, except during defrost. Contacts RW1 Electric Heat Operation Errors close. If its ASCD timer is satisfied the UCB will energize Temperature Limit compressor #1 contactor M1. After a two second delay, it then energizes compressor #2 contactor M2. Therefore, on a call for If the UCB senses zero volts from the high temperature limit, heat from W1, both sets of compressors are always energized, the indoor blower motor is immediately energized. -
Page 39: Start-Up (Cooling)
5168274-BIM-I-1121 Check blower drive belt tension. Table 18: Electric Heat Anticipator Setpoint Check the unit supply air (CFM). Setting, Amps Heater Voltage Measure evaporator fan motor's amp draw. 0.29 Set the room thermostat fan switch to off. 0.29 0.29 208/230-3-60 0.29 0.58 Turn unit electrical power off. -
Page 40: Charging The Unit
5168274-BIM-I-1121 Charging The Unit 15-Ton Charging Chart Cooling mode Outdoor Temp (ºF) 115º 105º 95º 85º 75º 65º Suction Pressure (psi) 1. Make sure that both condenser fans are running when charging. One fan may switch off at lower ambient temperatures making the chart above inaccurate. 2. -
Page 41: Maintenance
5168274-BIM-I-1121 Maintenance Normal Maintenance Perform all maintenance operations on the blower motor with electric power disconnected from the unit. Do not attempt to lubricate bearings with the unit in operation. Prior to any of the following maintenance procedures, shut off all electric power to the unit to prevent personal On an annual basis, check the motor for accumulations of dust, injury. -
Page 42: Smart Equipment™ Ucb Details
5168274-BIM-I-1121 THERMOSTAT WIRED HERE SD-24 Figure 22: Unit Control Board Table 19: 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 43 5168274-BIM-I-1121 Table 19: 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 44 5168274-BIM-I-1121 Table 19: 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 45 5168274-BIM-I-1121 Table 19: Smart Equipment™ UCB Details (Continued) Description Function & Comments 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 Pin Heat section connections at right on lower edge of UCB...
- Page 46 5168274-BIM-I-1121 Table 19: 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.
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Page 47: Cable For Fc Buses And Sa Buses In Order Of Preference
5168274-BIM-I-1121 Table 19: 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 48: Start-Up Sheet
5168274-BIM-I-1121 Start-Up Sheet Johnson Controls Ducted Systems... - Page 49 5168274-BIM-I-1121 Johnson Controls Ducted Systems...
- Page 50 5168274-BIM-I-1121 Johnson Controls Ducted Systems...
- Page 51 5168274-BIM-I-1121 Johnson Controls Ducted Systems...
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- Page 53 Subject to change without notice. Printed in U.S.A. 5168274-BIM-I-1121 Copyright © 2021 by Johnson Controls, Inc. All rights reserved. Supersedes: 5168274-BIM-H-0620 York International Corporation 5005 York Drive Norman, OK 73069...