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Summary of Contents for McQuay SEASONCON ALP-045C
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Page 3: Installation
INTRODUCTION GENERAL DESCRIPTION McQuay type ALP SEASONCON air cooled condensing units The electrical control center includes all safety and are designed for outdoor installations and are compatible with operating controls necessary for dependable automatic either air handling or chilled water systems. Each unit is com- operation except for the cooling thermostat since this is somewhat dependent on the unit application. -
Page 4: Service Access
FOR AIR INLET VIBRATION ISOLATORS Vibration isolators are recommended for all roof mounted in- McQuay isolator selection to the mounting surface. Table 3 stallations or wherever vibration transmission is a considera- shows the isolator loads at each location shown in Figure 4, tion. -
Page 6: Refrigerant Piping
ASHRAE Handbooks should, where applicable, be followed The control circuit for all compressors has been de- in the design and installation of piping. McQuay type ALP signed to include a pumpdown cycle. The use of a liquid condensing units are adaptable to either chilled water or air line solenoid is required for proper unit operation. -
Page 7: Refrigerant Piping Connections
Figure 6. SINGLE CIRCUIT EVAPORATOR - RECOMMENDED PIPING If Row Split Coils Are Used, Duplicate The Piping CONDENSING UNIT ABOVE THE EVAPORATOR CONDENSING UNIT BELOW THE EVAPORATOR Figure 7. DUAL CIRCUIT EVAPORATOR (FACE SPLIT) - RECOMMENDED PIPING NOTES: 1. Piping shown is for one compressor circuit; second circuit is similar. Must have separate piping for each compressor circuit. 2. -
Page 8: Holding Charge
3. Wherever vertical rise occurs in the suction piping, the minimum tonnage Table 8. Liquid line accessory kits (when supplied by McQuay) 886-580896A-06 NOTE: % Larger capacity expansion valve in liquid line accessory kit is used for circuit #2. -
Page 9: Refrigerant Charge
HOT GAS BYPASS COMPONENTS to bring the pressure to a maximum of 125 psig. The unit McQuay offers a “Hot Gas Bypass Accessory Kit” for each should then be leak tested with a Halide or electronic leak ALP unit size. Each kit includes a solenoid valve, a hot gas detector. -
Page 14: Field Wiring
FIELD WIRING Wiring must comply with all applicable codes and ordinances. one per compressor circuit plus one for condenser fans, are Warranty is voided if wiring is not in accordance with specifi- required and wiring with the unit is sized in accordance with cations. - Page 18 There is also a set of normally closed contacts on the switch A flow switch is available from McQuay under ordering that could be used for an indicator light or an alarm to in- number 860-175033B-00. It is a “paddle” type switch and dicate when a “no flow”...
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Page 19: Control Center
EVAPORATOR FAN INTERLOCK FOR AIR HANDLER COIL INSTALLATIONS It is important to interlock the air handler evaporator fan with purpose. Remove the jumpers between terminals 111 and the condensing unit control to insure that there will be a cool- 11.2 for circuit 1 and 211 and 212 for circuit 2. Use these ter- ing load on the evaporator before the unit can start to pre- minals for the evaporator fan interlock contacts. -
Page 22: Normal Sequence Of Operation
LP1 mechanical failure in the compressor. McQuay recommends closes. This energizes the compressor starting relay R9, start- corrective measures be taken if the compressor recycles ing the compressor via the compressor contactors Ml and repeatedly within 15-minute intervals. -
Page 48: Startup And Shutdown
This form is shipped with the unit, and after com- pressures on the low side of the system are above 60 psig, pletion should be returned to McQuay’s Service Depart- the unit will start and pump down. ment through your sales representative. -
Page 49: System Maintenance
McQuay recommends the use of non-condensables. foaming coil cleaners available at air conditioning supply... -
Page 50: Filter-Driers
10” F to 15” F. On valves purchased through McQuay, the superheat setting can be If the problem can be traced to the power element only, adjusted by removing the cap at the bottom of the valve to it can be unscrewed from the valve body without removing expose the adjustment screw. -
Page 51: In-Warranty Return Material Procedure
IN-WARRANTY RETURN MATERIAL PROCEDURE COMPRESSOR Copeland Refrigeration Corporation has stocking wholesalers vide McQuay with full details; i.e., McQuay unit model and who maintain a stock of replacement compressors and ser- unit serial numbers. Include the invoice and the salvage value vice parts to serve refrigeration contractors and servicemen. -
Page 52: High Pressure Control
HIGH PRESSURE CONTROL The high pressure control is a single pole pressure activated trol on a high pressure gauge. switch that closes on a pressure rise. When the switch closes, The control is attached to a Shrader fitting and is located R1 is energized which in turn de-energizes the control cir- on a cylinder head near the discharge King valve. - Page 53 Figure 22. Figure 23. FANTROL Sensors. PC22 & PC12 COMPRESSOR LOCKOUT Compressor lockout consists of an adjustable 0 to 6 minute To check the control, the compressor must be running in- time delay. It is wired in series with the R 5 relay that energizes itially.
- Page 54 APPENDIX OPTIONAL CONTROLS SPEEDTROL HEAD PRESSURE CONTROL (OPTIONAL) partments. Units with 460 volt power have a transformer The SPEEDTROL system of head pressure control operates mounted inside the condenser fan 21 fan compartment to step in conjunction with FANTROL by modulating the motor speed on fans 11 and 21 in response to condensing temperature.
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Page 55: Phase/Voltage Monitor (Optional)
(see Figures bypass valve starts to open, the refrigerant line on the 10 thru 12). The pressure regulating valve that McQuay of- evaporator side of the valve will begin to feel warm to the fers is factory set to begin opening at 58 psig (32F for R-22) touch. -
Page 58: Troubleshooting Chart
TROUBLESHOOTING CHART COMPRESSOR WILL Main switch open. Close switch. shorts or NOT RUN Fuse blown. Circuit breakers open. Check electrical circuits and motor winding for grounds Investigate for possible overloading. Replace Check for fuse or reset breakers after fault is corrected. loose or corroded connections. - Page 59 TROUBLESHOOTING CHART (Continued) Low voltage during high load conditions Check supply voltage for excessive line drip. Defective or grounded wiring in motor Replace compressor motor. Loose power wiring Check all connections and tighten. High condensing temperature. See Corrective Steps for high discharge pressure. Power line fault causing unbalanced voltage.
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