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Summary of Contents for McQuay SEASONCON ALP-037A-S
- Page 1 BULLETIN NO. IM 269-2 OCTOBER, 1984 FORM NO. 4154631 SEASONCON PACKAGED AIR COOLED CONDENSING UNIT MODELS ALP-037A THRU 107A, 067B THRU 159B, & 179A AIR connmonlnG 0. 60~ 13600 Industrial Park Blvd.. P 1551, Minneapolis, 55440...
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Page 2: Table Of Contents
....2 4 - 3 9 Compressor control schematics TROUBLE SHOOTING CHART. “DAMPERTROL”, “FANTROL”, “McQUAY” , “SEASONPAK”, and “SPEEDTROL” are registered trademarks of McQuay Inc., Minneapolis, Minnesota. I lM269... -
Page 3: Introduction
INTRODUCTION GENERAL DESCRIPTION McQuay type ALP SEASONCON air cooled condensing units ing evaporator. are designed for outdoor installations and are compatible with The electrical control center includes all safety and either air handling or chilled water systems. Each unit is com-... -
Page 6: Refrigerant Piping
ALP models. tom through the side access panels above the compressor LIQUID LINE COMPONENTS McQuay has available a “Liquid Line Accessory Kit” for each Replaceable core type filter-driers. ALP unit size. Components selected for these kits were Filter-drier core elements. -
Page 18: Sequence Of Operation
Figure 18. ALP-089B, 106B, 126B thru 159A, & 179A Control Center Layout Power into unit Recommended field mounted disconnect switch SEQUENCE OF OPERATION For ALP-037A thru 0788, 091A, 098A & 107A Units: MP3, R7, TD12, M3 and M7. The components for a two-compressor unit, models With the control circuit power on, control stop switch Sl ALP-046A, 057A, 0678, 078B, 091A, 098A and 107A are closed, and manual pumpdown... -
Page 40: Start-Up And Shutdown
(Form No. 206036A) be completed to obtain full warranty benefits. This form is shipped with the unit and after com- chilled water or leaving air temperature. pletion should be returned to McQuay Service Department Allow the crankcase heaters to operate for at least 12 through your sales representative. -
Page 41: System Maintenance
REFRIGERANT SIGHTGLASS The refrigerant sightglasses should be observed periodical- from McQuay as part of the “Liquid Line Accessory Kits” ly. (A monthly observation should be adequate.) A clear glass listed on page 6, an element inside the sightglass indicates of liquid indicates that there is adequate refrigerant charge what moisture condition corresponds to a given element color. -
Page 42: Service
1 OF to 15F. On valves If this problem can be traced to the power element only, it purchased through McQuay, the superheat setting can be can be unscrewed from the valve body without removing the... -
Page 43: In-Warranty Return Material Procedure
IN-WARRANTY RETURN MATERIAL PROCEDURE COMPRESSOR Copeland Refrigeration Corporation has stocking wholesalers vide McQuay with full details: McQuay unit model and unit who maintain a stock of replacement compressors and ser- serial numbers. Include the invoice and the salvage value vice parts to serve refrigeration contractors and servicemen. -
Page 44: High Pressure Control
HIGH PRESSURE CONTROL The high pressure control is a single pole pressure activated pressure rise. The highest point reached before cut-out is the switch that opens on a pressure rise to de-energize the en- cut-out setting of the control. tire control circuit except for compressor crankcase heaters. It senses condenser pressure and is factory set to open at CAUTION: Although there is an additional pressure relief 380 psig and can be manually reset closed at 315 psig. -
Page 45: Speedtrol Head Pressure Control
APPENDIX: OPTIONAL CONTROLS SPEEDTROL - HEAD PRESSURE CONTROL ALP-037A thru 078B, 091A, 098A and 107A The SPEEDTROL system of head pressure control operates SC21 are mounted inside the compressor compartment near the top of the condenser coils, Units with 460 volt power have in conjunction with FANTROL by modulating the motor speed a transformer mounted on the back of the control box to step on fans 11 and 21 in response to condensing pressure. -
Page 46: Low Ambient Start
LOW AMBIENT START (OPTIONAL) Low ambient start is available on all units as an option with original normally closed position by moving the pumpdown FANTROL and included automatically with optional SPEED- switch(es) PS1 or PS2 to the “manual pumpodown” posi- TROL or DAMPERTROL. -
Page 47: Hotgasbypass
When the bypass valve starts to open, the refrigerant line on the evaporator side of the valve will begin 11). The pressure regulating valve that McQuay offers is fac- tory set to begin opening at 58 psig (32F for R-22) when the to feel warm to the touch. -
Page 48: Troubleshooting Chart
TROUBLESHOOTING CHART PROBLEM POSSIBLE CAUSES POSSIBLE CnRRFCTlVF STFPR Compressor Will 1. Main switch open. 1. Close switch. Not Run 2. Fuse blown. Circuit breakers open. 2. Check electrical circuits and motor windings for shorts or grounds. Investigate for possible overloading. Replace fuse or reset breakers after fault is corrected.
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