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R-410A
ZR SERIES
6-1/2 - 12-1/2 Ton
60 Hertz
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Preceding Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power And Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 15
Optional Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Optional Gas Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Options/Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Economizer And Power Exhaust Set Point
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Air Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Checking Air Quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
1 ZR078-150 Unit Limitations . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Weights and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 ZR078-150 Unit Accessory Weights . . . . . . . . . . . . . . . . . 9
4 ZR078-150 Unit Physical Dimensions . . . . . . . . . . . . . . 10
5 ZR078-150 Unit Clearances . . . . . . . . . . . . . . . . . . . . . . 10
6 Side Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7 Control Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9 ZR078-150 Physical Data . . . . . . . . . . . . . . . . . . . . . . . . 26
10 Electric Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . 27
11 Gas Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
12 Gas Pipe Sizing - CapacIty of Pipe . . . . . . . . . . . . . . . . . 28
13 Gas Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . . . 29
14 Supply Air Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
15 Altitude/Temperature Correction Factors . . . . . . . . . . . . 34
16 Air Flow Performance - Side Duct Application . . . . . . . . 36
17 Air Flow Performance - Bottom Duct Application . . . . . . 38
1 Unit Shipping Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Condenser Covering . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Compressor Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
®
4 Predator
Component Location (ZR120 Shown) . . . . . . . 6
5 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Unit 6 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Center of Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
8 ZR078-120 Physical Dimensions . . . . . . . . . . . . . . . . . . . 9
9 ZR150 Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . 9
10 ZR078-150 Unit Bottom Duct Openings . . . . . . . . . . . . 10
11 ZR078-150 Unit Electrical Entry . . . . . . . . . . . . . . . . . . . 11
12 ZR078-120 Unit Side Duct Openings . . . . . . . . . . . . . . . 11
13 ZR150 Unit Side Duct Openings . . . . . . . . . . . . . . . . . . 12
14 ZR078-150 Unit Left Duct Opening . . . . . . . . . . . . . . . . 12
15 ZR078-150 Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . 13
16 ZR078-150 Transition Roof Curb . . . . . . . . . . . . . . . . . . 13
17 Side Panels With Hole Plugs . . . . . . . . . . . . . . . . . . . . . 14
18 Return Downflow Plenum With Panel . . . . . . . . . . . . . . 14
19 Discharge Panel In Place . . . . . . . . . . . . . . . . . . . . . . . . 14
20 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
TABLE OF CONTENTS
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . 44
No Outdoor Air Options . . . . . . . . . . . . . . . . . . . . . . . . . 44
Cooling Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . 45
Reheat Mode Sequence Of Operation . . . . . . . . . . . . . . . 46
Electric Heating Sequence Of Operations . . . . . . . . . . . . 47
Electric Heat Operation Errors . . . . . . . . . . . . . . . . . . . . 47
Gas Heating Sequence Of Operations . . . . . . . . . . . . . . . 48
Ignition Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Gas Heating Operation Errors . . . . . . . . . . . . . . . . . . . . 49
Start-Up (Cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Start-Up (Gas Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Checking Gas Heat Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Charging The Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Unit Control Board Option Setup . . . . . . . . . . . . . . . . . . . . . . 55
Option Byte Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Heat Delay Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
LIST OF TABLES
18 RPM Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
19 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . . 40
20 Power Exhaust Specifications . . . . . . . . . . . . . . . . . . . . 40
21 Motor Sheave Datum Diameters . . . . . . . . . . . . . . . . . . 42
22 Additional Static Resistance . . . . . . . . . . . . . . . . . . . . . . 43
23 Electric Heat Limit Setting 50" Cabinet . . . . . . . . . . . . . . 48
24 Electric Heat Limit Setting 42" Cabinet . . . . . . . . . . . . . . 48
25 Electric Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . 48
26 Gas Heat Limit Control Settings . . . . . . . . . . . . . . . . . . . 50
27 Gas Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . . 50
28 Gas Rate Cubic Feet Per Hour . . . . . . . . . . . . . . . . . . . . 52
29 Gas Heat Stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
30 Unit Control Board Flash Codes . . . . . . . . . . . . . . . . . . . 54
31 Ignition Control Flash Codes . . . . . . . . . . . . . . . . . . . . . . 54
32 Reheat Control Board Flash Codes . . . . . . . . . . . . . . . . 54
33 Heat Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
LIST OF FIGURES
21 Typical Field Wiring Disconnect - Cooling Unit With/
Without Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
22 Typical Field Wiring Disconnect - Cooling Unit With
Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
23 Typical Low Voltage Field Wiring . . . . . . . . . . . . . . . . . . 17
24 Side Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . 28
25 Bottom Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . 28
26 Enthalpy Set Point Chart . . . . . . . . . . . . . . . . . . . . . . . . 32
27 Honeywell Economizer Control W7212 . . . . . . . . . . . . . 32
28 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
29 Altitude/Temperature Correction Factors . . . . . . . . . . . . 34
30 Dry Coil Delta P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
31 Reheat Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . 47
32 Typical Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
33 Typical Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
34 Unit Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
35 Basic Troubleshooting Flowchart . . . . . . . . . . . . . . . . . . 57
36 Power On Flow Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
37 Trip Failure Flow Chart . . . . . . . . . . . . . . . . . . . . . . . . . 58
292447-YIM-A-0507
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Related Manuals for York Predator ZR Series
Summary of Contents for York Predator ZR Series
- Page 1 R-410A ZR SERIES 6-1/2 - 12-1/2 Ton 60 Hertz TABLE OF CONTENTS General ......... . 2 Operation .
- Page 2 292447-YIM-A-0507 General ® ® York Predator units are single package air conditioners with optional gas heating designed for outdoor installation on a Before performing service or maintenance operations on rooftop or slab and for non-residential use. These units can be unit, turn off main power switch to unit.
- Page 3 A separate Renewal Parts request for inspection by the carrier’s agent should be made in ® writing. Contact your local York parts distribution center for authorized replacement parts. Approvals Design certified by CSA as follows:...
- Page 4 292447-YIM-A-0507 Nomenclature ® 6.5-12.5 Ton York Model Number Nomenclature Z R 090 N10 A 2 A AA 4 0 1 2 4 A Product Category Product Style A = Style A Z = A/C, Single Pkg., R-410A B = Style B...
- Page 5 292447-YIM-A-0507 Installation Remove the toolless doorknobs and instruction packet prior to installation. Installation Safety Information Read these instructions before continuing this appliance installation. This is an outdoor combination heating and cooling unit. The installer must assure that these instructions are made available to the consumer and with instructions to retain them for future reference.
- Page 6 292447-YIM-A-0507 After installation, gas fired units must be adjusted to obtain a Size of unit for proposed installation should be based on heat temperature rise within the range specified on the unit rating loss/heat gain calculation made according to the methods of Air plate.
- Page 7 If a unit is to be installed on a roof curb other than a ® varnishes, hydrochloric acid, cements and glues, York roof curb, gasketing must be applied to all antistatic fabric softeners for clothes dryers, masonry surfaces that come in contact with the unit underside.
- Page 8 292447-YIM-A-0507 Before lifting, make sure the unit weight is distributed equally on the rigging cables so it will lift evenly. Units may be moved or lifted with a forklift. Slotted openings in the base rails are provided for this purpose. LENGTH OF FORKS MUST BE A MINIMUM OF 60 INCHES.
- Page 9 292447-YIM-A-0507 Table 3: ZR078-150 Unit Accessory Weights Weight (lbs.) Unit Accessory Shipping Operating Economizer Power Exhaust Electric Heat Gas Heat 1. Weight given is for the maximum heater size available (54KW). 2. Weight given is for the maximum number of tube heat exchangers available (8 tube).
- Page 10 292447-YIM-A-0507 Table 4: ZR078-150 Unit Physical Dimensions Dimension (in.) Unit Model Number ZR078 22 1/8 18 3/16 15 3/16 6 3/16 ZR090 22 1/8 18 3/16 15 3/16 6 3/16 ZR102 50 3/4 30 3/16 24 3/16 17 3/16 6 3/16 ZR120 50 3/4 30 3/16...
- Page 11 292447-YIM-A-0507 Figure 11: ZR078-150 Unit Electrical Entry Figure 12: ZR078-120 Unit Side Duct Openings Unitary Products Group...
- Page 12 292447-YIM-A-0507 Figure 13: ZR150 Unit Side Duct Openings Table 6: Side Duct Dimensions Dimension (in.) Unit Model Number ZR078 27 3/4 12 1/16 27 1/2 ZR090 27 3/4 12 1/16 27 1/2 ZR102 28 1/4 18 1/16 28 1/4 18 1/4 ZR120 28 1/4 18 1/16...
- Page 13 292447-YIM-A-0507 RIGHT 80-5/8 INSULATED DECK UNDER CONDENSER SECTION SUPPLY RETURN 2 TYP. 50-1/2 INSULATED DECK UNDER COMPRESSOR SECTION FRONT 8 or 14 Figure 15: ZR078-150 Roof Curb Figure 16: ZR078-150 Transition Roof Curb Ductwork supply and return air duct connections at the unit should be made with flexible joints to minimize noise.
- Page 14 292447-YIM-A-0507 Duct Covers Units are shipped with the side duct openings covered and a covering over 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.
- Page 15 If installing a disconnect (field Exposure, even if immediately cleaned up, may cause ® supplied or York International supplied accessory), refer to embrittlement (leading to cracking) to occur in one year Figure 4 for the recommended mounting location.
- Page 16 292447-YIM-A-0507 Figure 21: Typical Field Wiring Disconnect - Cooling Unit With/Without Electric Heat Figure 22: Typical Field Wiring Disconnect - Cooling Unit With Gas Heat Unitary Products Group...
- Page 17 292447-YIM-A-0507 Thermostat Wiring thermostat to the unit. Refer to Table 7 for control wire sizing and maximum length. The thermostat should be located on an inside wall approximately 56 inch above the floor where it will not be Table 7: Control Wire Sizes subject to drafts, sun exposure or heat from electrical fixtures or Wire Size Maximum Length...
- Page 18 292447-YIM-A-0507 Table 8: Electrical Data ZR078-150 Standard Motor - Without Powered Convenience Outlet OD Fan Supply Max Fuse Compressors Max Fuse Motors Blower Conv Electric Heat Option Breaker (each) Size w/Pwr Breaker (each) Motor Motor Outlet Volt Size w/ (Tons) (Amps) Size Pwr Exh...
- Page 19 292447-YIM-A-0507 ZR078-150 Standard Motor - Without Powered Convenience Outlet (Continued) OD Fan Supply Max Fuse Compressors Max Fuse Motors Blower Conv Electric Heat Option Breaker (each) Size w/Pwr Breaker (each) Motor Motor Outlet Volt Size w/ (Tons) (Amps) Size Pwr Exh (Amps) (Amps) RLA LRA...
- Page 20 292447-YIM-A-0507 ZR078-150 Hi Static Motor - Without Powered Convenience Outlet OD Fan Supply Max Fuse Compressors Max Fuse Motors Blower Conv Electric Heat Option Breaker (each) Size w/Pwr Breaker (each) Motor Motor Outlet Volt Size w/ Pwr (Tons) (Amps) Size (Amps) (Amps) RLA LRA...
- Page 21 292447-YIM-A-0507 ZR078-150 Hi Static Motor - Without Powered Convenience Outlet (Continued) OD Fan Supply Max Fuse Compressors Max Fuse Motors Blower Conv Electric Heat Option Breaker (each) Size w/Pwr Breaker (each) Motor Motor Outlet Volt Size w/ Pwr (Tons) (Amps) Size (Amps) (Amps)
- Page 22 292447-YIM-A-0507 ZR078-150 Standard Motor - With Powered Convenience Outlet OD Fan Supply Max Fuse Compressors Max Fuse Motors Blower Conv Electric Heat Option Breaker (each) Size w/Pwr Breaker (each) Motor Motor Outlet Volt Size w/ Pwr (Tons) (Amps) Size (Amps) (Amps) RLA LRA Model...
- Page 23 292447-YIM-A-0507 ZR078-150 Standard Motor - With Powered Convenience Outlet (Continued) OD Fan Supply Max Fuse Compressors Max Fuse Motors Blower Conv Electric Heat Option Breaker (each) Size w/Pwr Breaker (each) Motor Motor Outlet Volt Size w/ Pwr (Tons) (Amps) Size (Amps) (Amps) RLA LRA...
- Page 24 292447-YIM-A-0507 ZR078-150 Hi Static Motor - With Powered Convenience Outlet OD Fan Supply Max Fuse Compressors Max Fuse Motors Blower Conv Electric Heat Option Breaker (each) Size w/Pwr Breaker (each) Motor Motor Outlet Volt Size w/ Pwr (Tons) (Amps) Size (Amps) (Amps) RLA LRA...
- Page 25 292447-YIM-A-0507 ZR078-150 Hi Static Motor - With Powered Convenience Outlet (Continued) OD Fan Supply Max Fuse Compressors Max Fuse Motors Blower Conv Electric Heat Option Breaker (each) Size w/Pwr Breaker (each) Motor Motor Outlet Volt Size w/ Pwr (Tons) (Amps) Size (Amps) (Amps)
- Page 26 292447-YIM-A-0507 Table 9: ZR078-150 Physical Data Models Component ZR078 ZR090 ZR102 ZR120 ZR150 Nominal Tonnage 12.5 ARI COOLING PERFORMANCE Gross Capacity @ ARI A point (Btu) 80000 91000 106000 125000 156000 ARI net capacity (Btu) 78000 88000 102000 120000 150000 11.2 11.2 11.2...
- Page 27 292447-YIM-A-0507 Table 9: ZR078-150 Physical Data (Continued) Models Component ZR078 ZR090 ZR102 ZR120 ZR150 Nominal Tonnage 12.5 CONDENSER FAN DATA Quantity Fan diameter (Inch) Type Prop Prop Prop Prop Prop Drive type Direct Direct Direct Direct Direct No. speeds Number of motors Motor HP each Nominal total CFM 6800...
- Page 28 292447-YIM-A-0507 Optional Gas Heat These gas-fired heaters have aluminized-steel or optional stainless steel, tubular heat exchangers with spark ignition. Table 11: Gas Application Data Unit Input Temp Rise Output (MBH) (MBH) (°F) Size Opt. 20-50 35-65 15-45 30-60 10-40 25-55 20-50 35-65 10-40...
- Page 29 292447-YIM-A-0507 Table 13: Gas Heat Minimum Supply Air Supply Air (CFM) Size Model Heat Size Cooling Heating (Tons) 1950 3250 1950 3250 (6.5) 1950 3250 1950 3250 2250 3750 2250 3750 (7.5) 2250 3750 2250 3750 2550 4250 2550 4250 (8.5) 2550 4250...
- Page 30 292447-YIM-A-0507 Threaded joints should be coated with a sealing FIRE OR EXPLOSION HAZARD compound that is resistant to the action of liquefied Failure to follow the safety warning exactly could result petroleum gases. Do not use Teflon tape. in serious injury, death or property damage. Never test for gas leaks with an open flame.
- Page 31 292447-YIM-A-0507 Power Exhaust counterclockwise until the desired minimum damper position has been attained. The Power Exhaust can be a factory installed option or a field installed accessory. If factory installed, refer to the instructions Enthalpy Set Point Adjustment included with the outdoor air hood to complete the assembly. •...
- Page 32 292447-YIM-A-0507 CONTROL POINT CONTROL APPROX. CURVE (29) (32) (35) (38) (41) (43) AT 50% RH 73 (23) 70 (21) (27) 67 (19) 63 (17) (24) (21) (18) (16) (13) (10) (10) (13) (16) (21) (24) (27) (29) (32) (38) (41) (43) (18) (35)
- Page 33 292447-YIM-A-0507 Scroll compressors require proper rotation to operate Procedure for adjusting belt tension: correctly. Units are properly phased at the factory. Do 1. Loosen six nuts (top and bottom) A. not change the internal wiring to make the blower 2. Adjust by turning (B). condenser fans, or compressor rotate correctly.
- Page 34 292447-YIM-A-0507 Table 15: 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 35 292447-YIM-A-0507 Drive Selection Determine desired airflow. Calculate or measure the amount of external static pressure. Using the operating point determined from steps 1 & 2, locate this point on the appropriate supply air blower performance table. (Linear interpolation may be necessary.) Noting the RPM and BHP from step 3, locate the appropriate model and drive on the RPM selection table.
- Page 36 292447-YIM-A-0507 Table 16: Air Flow Performance - Side Duct Application ZR078 (6.5 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 1.5 HP &...
- Page 37 292447-YIM-A-0507 ZR120 (10 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 2 HP & Field Supplied Drive Standard 2 HP &...
- Page 38 292447-YIM-A-0507 Table 17: Air Flow Performance - Bottom Duct Application ZR078 (6.5 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 1.5 HP &...
- Page 39 292447-YIM-A-0507 ZR120 (10 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 2 HP & Field Standard 2 HP & Drive Hi Static 3 HP &...
- Page 40 292447-YIM-A-0507 Table 19: Indoor Blower Specifications Motor Motor Sheave Blower Sheave Size Model Datum Dia. Datum Dia. Belt (Tons) Eff. Frame Bore (in.) Model Bore (in.) Model (in.) (in.) 1-1/2 1725 1.15 3.4 - 4.4 1VM50 AK74 (6.5) 1725 1.15 3.4 - 4.4 1VM50 AK64...
- Page 41 292447-YIM-A-0507 To adjust Measured CFM to Required CFM, see SUPPLY AIR DRIVE ADJUSTMENT. After reading has been obtained, remove the tubes and seal holes. Failure to properly adjust the total system air quantity can result in extensive blower damage. NOTE: With the addition of field installed accessories repeat this procedure.
- Page 42 292447-YIM-A-0507 Supply Air Drive Adjustment EXAMPLE A 12.5 ton unit was selected to deliver 4,000 CFM with a 3 HP motor, but the unit is delivering 3,800 CFM. The variable pitch motor sheave is set at 2 turns open. Before making any blower speed changes review the Use the equation to determine the required DD for the new installation for any installation errors, leaks or undesirable motor sheave,...
- Page 43 292447-YIM-A-0507 Table 22: Additional Static Resistance Electric Heat kW Size Model Cooling Only Economizer (Tons) 1900 0.00 0.07 0.05 0.06 0.07 0.08 0.10 2100 -0.01 0.09 0.06 0.07 0.08 0.09 0.11 2300 -0.01 0.11 0.07 0.08 0.09 0.10 0.13 2500 -0.02 0.13 0.08...
- Page 44 292447-YIM-A-0507 Operation If there is an initial call for both stages of cooling, the UCB will delay energizing compressor #2 by 30 seconds in order to avoid a power rush. Cooling Sequence Of Operation Once the thermostat has been satisfied, it will de-energize Y1 ®...
- Page 45 292447-YIM-A-0507 addition. The power exhaust motor is energized 45 seconds Freezestat after the actuator position exceeds the exhaust fan set point on During cooling operation, if a freezestat opens, the UCB will de- the economizer control. When the power exhaust is operating, energize the associated compressor, initiate the ASCD, and, if the second stage of mechanical cooling will not operate.
- Page 46 292447-YIM-A-0507 Compressor Protection When the room thermostat calls for second stage cooling, the RCB senses a signal through "Y1" & "Y2" and engages circuit In addition to the external pressure switches, the compressors #1 and circuit #2 in cooling mode. also have inherent (internal) protection.
- Page 47 292447-YIM-A-0507 HGRR DEHUMIDISTAT MODE HARNESS SELECTION CONNECTION JUMPER Figure 31: Reheat Control Board Electric Heating Sequence Of Operations b The thermostat will cycle the electric heat to satisfy the heating requirements of the conditioned space. The following sequence describes the operation of the electric heat section.
- Page 48 292447-YIM-A-0507 Safety Controls Reset The UCB monitors the temperature limit switch of electric heat Remove the call for heating by lowering the thermostat setting units. lower than the conditioned space temperature.This resets any flash codes. The control circuit includes the following safety controls: Electric Heat Anticipator Setpoints Limit Switch (Ls) It is important that the anticipator setpoint be correct.
- Page 49 292447-YIM-A-0507 When “W1” is satisfied, both valves are closed. If “W1” is present, a flame is sensed, but the GV is not energized, the draft motor is energized until the flame detection Second Stage Of Heating is lost. Normal operation is now allowed. When the ICB receives a call for the second stage of heating, The flame detection circuitry continually tests itself.
- Page 50 292447-YIM-A-0507 gas heat limit switch operation except the auxiliary is manual Gas Heat Anticipator Setpoints reset. Consequently, the control will respond in the same It is important that the anticipator setpoint be correct. Too high manner as outlined above under “Limit Switch”. of a setting will result in longer heat cycles and a greater temperature swing in the conditioned space.
- Page 51 292447-YIM-A-0507 Start-Up (Gas Heat) Shut Down Set the thermostat to the lowest temperature setting. Pre-Start Check List Turn “OFF” all electric power to unit. Complete the following checks before starting the unit. Open gas heat access panel. Check the type of gas being supplied. Be sure that it is the same as listed on the unit nameplate.
- Page 52 292447-YIM-A-0507 Turn off all power to the unit. Table 28: Gas Rate Cubic Feet Per Hour Using the outlet pressure port on the gas valve, connect a Size of Test Dial Seconds for manometer to monitor the manifold pressure. One Rev. 1/2 cu.
- Page 53 292447-YIM-A-0507 Charging The Unit Burners/Orifices Inspection/Servicing Before checking or changing burners, pilot or orifices, CLOSE All ZR units use Thermal Expansion Devices. Charge the unit to MAIN MANUAL SHUT-OFF VALVE AND SHUT OFF ALL 10° subcooling. POWER TO THE UNIT. Troubleshooting Open the union fitting just upstream of the unit gas valve and downstream from the main manual shut-off valve in...
- Page 54 292447-YIM-A-0507 Table 30: Unit Control Board Flash Codes Green Flash Code Description On Steady This is a Control Failure 1 Flash Not Applicable 2 Flashes Control waiting ASCD Flashing 3 Flashes HPS1 Compressor Lockout 4 Flashes HPS2 Compressor Lockout 5 Flashes LPS1 Compressor Lockout 6 Flashes LPS2 Compressor Lockout...
- Page 55 292447-YIM-A-0507 Check Alarm History Reset All ASCDs for One Cycle Non Alarm Condition Green LED Flashing Current Alarm Flashed Red LED Figure 34: Unit Control Board Unit Control Board Option Setup • Press the UP or Down button to change the LED status to correspond to the desired Option Setup.
- Page 56 292447-YIM-A-0507 Heat Delay Setup Table 33: Heat Delay Heat Heat • Enter the Option Setup mode by pushing the OPTION Fan On Fan Off SETUP / STORE button, and holding it for at least 2 LED 8 LED 4 LED 2 LED 1 Delay Delay...
- Page 57 292447-YIM-A-0507 Figure 35: Basic Troubleshooting Flowchart Figure 36: Power On Flow Chart Unitary Products Group...
- Page 58 292447-YIM-A-0507 Figure 37: Trip Failure Flow Chart Unitary Products Group...
- Page 59 292447-YIM-A-0507 Cooling Troubleshooting Guide the economizer provides free cooling, following a short delay compressor #1 will be energized unless it is locked On calls for cooling, if the compressors are operating but the out. If compressor #1 is locked out, compressor #2 is supply air blower motor does not energize after a short delay energized.
- Page 60 292447-YIM-A-0507 out, the UCB may have the compressor in an ASCD. cooling. If the second stage of cooling is requested, Check the LED for an indication of an ASCD cycle. The following a short delay, compressor #1 will be energized ASCD should time out within 5 minutes.
- Page 61 292447-YIM-A-0507 10. If 24 volts is present at the UCB Y2 terminal and none of on a loss of call for the first stage of cooling, i.e. a loss if 24 the switches are open and the compressor is not locked volts at the Y1 terminal.
- Page 62 292447-YIM-A-0507 conditions. These options are not enabled by default. They a. If 24 volts is not present at the UCB supply air blower can be checked by local distributors. motor terminal, check for 24 volts from the room thermostat. If 24 volts is not present from the room For units with factory installed economizers, the UCB is thermostat, check for the following: programmed to lock out compressor operation when the...
- Page 63 292447-YIM-A-0507 If the furnace is hot, it may be out on a high temperature the gas valve. Check to make sure the ground connections limit open; wait for limit reset. are intact. If all are intact replace the ICB. If 24 volts is present, remove the pilot burner and the orifice.
- Page 64 Subject to change without notice. Printed in U.S.A. 292447-YIM-A-0507 Copyright © 2007 by Unitary Products Group. All rights reserved. Supersedes: Nothing Unitary 5005 Norman Products York Group Drive 73069...
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