Table of Contents
Related Manuals for McQuay seasoncon ALP-067A
Summary of Contents for McQuay seasoncon ALP-067A
- Page 1 BULLETIN NO. IM 173 JULY 1978 INSTALLATION AND MAINTENANCE DATA PACKAGED AIR COOLED CONDENSING UNIT TYPE ALP-067A THRU 159A G R O U P M c Q U A Y - P E R F E X Inc. 13600 Industrial Park Blvd., P.O. Box 1551, Minneapolis, Mn. 55440 @)
- Page 2 N O T I C E : Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes and regulations, and experienced with this type of equipment. CAUTION: Sharp edges and coil surfaces are a potential injury hazard.
-
Page 4: Refrigerant Circuits
Nomenclature PROPELLER FANS LOW POWER CONSUMING AIR COOLED CONDENSER - 089 A D REFRIGERANT CIRCUITS (D=Dual; S=Single) DESIGN VINTAGE NOMINAL CAPACITY (TONS) Inspection When the equipment is received, all items should be carefully checked against the bill of lading to insure a complete shipment. All units should be carefully inspected for damage upon arrival. -
Page 5: Shipping Weights
Never allow any part of the unit to fall during unloading or moving as this may result in serious damage. To lift the unit, 2+" diameter lifting holes are provided in the base of the unit. Spreader bars and cables should be arranged to prevent damage to the condenser coils or unit cabinet. - Page 6 M I N I M U NOTE: feet. than one side is obstructed or between adjacent units. Consult your McQUAY sales representative. Service Access Each end of the unit must be accessible after installation for peri- odic service work. Compressors and manual liquid line shutoff valves...
-
Page 7: Vibration Isolators
Figure 4 shows isolator locations in relation to the unit control center. Figure 5 gives dimensions that are required to secure each McQuay isolator selection to the mounting surface. Table 3 shows the isolator loads at each location shown in Figure 4 and the maximum loads for each McQuay selection. -
Page 9: Refrigerant Piping
REFRIGERANT PIPING General McQuay type ALP condensing units are adaptable to either chilled water or air handling air conditioning applications. The only re- striction on applications is that the evaporator be selected for a system using refrigerant 22. Evaporator Above Condensing Unit Figure 6 shows an installation where the evaporator is installed above the condensing unit. -
Page 14: Typical Field Wiring
S Y S T E M S 1 PUMP OPERATION CONSULT McOUAY Thermostat Wiring Since it is impossible for McQuay to anticipate the type of installa- tion that an ALP condensing unit may be used on, we do not factory install a thermostat. - Page 18 A flow switch is available from McQuay under ordering number 860- It is a "paddle" type switch and adaptable to any pipe size from 1"...
- Page 19 UNIT LAYOUT AND PRINCIPLES OF OPERATION Control Center All electrical controls are enclosed in a weatherproof control cen- ter with keylocked, hinged access doors. The control center is com- posed of three separate enclosures. The upper enclosure is the largest and contains all of the 208, 230, or 460 volt compressor and fan motor starting controls.
- Page 22 Sequence of Operation The following sequence of operation is typical for ALP Seasoncon air It is written for a 4 compressor cooled condensing unit operation. unit, but where components that apply to the fourth compressor are referred to, the equivalent components for the third and second com- pressors are indicated in parentheses.
-
Page 37: Startup And Shutdown
After system performance has stabilized, it is necessary that the "Compressorized Equipment Warranty Form" (form no. 206036A) be completed to obtain full warranty benefits. This form is shipped with the unit and after completion should be returned to McQuay's Service Department through your sales representative. page... - Page 38 Temporary Shut-Down Move pumpdown switches (PSl & PS2) to the "man. pumpdown" position. After the compressors have pumped down, turn off the chilled water pump or evaporator fan. It is especially important on chilled water installations that the compressors pump down before the water flow to the evaporator is interrupted to avoid freeze up.
-
Page 39: System Maintenance
SYSTEM MAINTENANCE General On initial start up and periodically during operation it will be Among these necessary to perform certain routine service checks. are checking the compressor oil level and taking condensing, suc- tion and oil pressure readings. During operation, the oil level should be visible in the oil sight glass with the compressor run- ning. - Page 40 At the present time, Suniso #3GS oil is the only oil approved by Copeland for use in these compressors. The oil level should be main- tained at about the midpoint of the sight glass on the compressor body. Condensers Condensers are air cooled and constructed with 3/8 0-D. copper tubes bonded in a staggered pattern into rippled aluminum fins.
- Page 41 Typically, superheat should run in the range of 10F to 15F. On valves purchased through McQuay , the superheat setting can be adjusted by removing a cap at the bottom of the valve to expose the adjustment screw. Turn the screw clockwise (when viewed from the adjustment screw end) to increase the superheat setting and counter- clockwise to reduce superheat.
-
Page 42: Troubleshooting Chart
Trouble Shooting Chart PROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS 1. Main switch open. 1. Close switch. 2. Fuse blown. Circuit breakers open. 2. Check electrical circuits and motor winding for shorts or grounds. Investigate for possible overloading. Re- place fuse or reset breakers after fault is corrected. 3. -
Page 43: In-Warranty Return Material Procedure
When a compressor fails in warranty, contact your local sales represen- tative, or McQuay Warranty Claims Department at the address on the cover of this bulletin. You will be authorized to exchange the de- fective compressor at a Copeland Wholesaler, or an advance replace- ment can be obtained. - Page 44 It takes about 120 seconds to warm the heater element enough to open the bimetallic contact thus allowing time for the pressure differen- tial to develop. If during operation, the differential drops below 10 PSI, the heater element will be energized and the compressor will stop. The control can be reset by pushing the reset button on the control.
- Page 45 Low Pressure Control The low pressure control is a single pole pressure switch that closes on a pressure rise. It senses evaporator pressure and is factory set to close at 60 PSIG and automatically open at 25 PSIG. The control has an adjustable range of 20 in.
-
Page 46: Optional Controls
OPTIONAL CONTROLS Dampertrol - Optional Head Pressure Control Dampertrol is an optional system for reducing condenser capacity. It consists of an assembly of damper blades, linkages and blade operators installed over the first fan turned on by Fantrol (Fan No. 11) and arranged to operate as shown. -
Page 47: Time Delay
Part Winding Start - Optional Part winding start is available on all voltage units and consists of a solid state time delay wired in series with the contactor that ener- gizes the 2nd winding of each compressor motor. Its purpose is to limit current in-rush to the compressors upon start up. - Page 48 NOTE: Line is only hot when the unit thermostat calls for compressor to run. Compressor Lockout - Optional Compressor lockout consists of a solid state time delay wired in series with compressor contactor( Its purpose is to prevent rapid compressor cycling when cooling demands are erratic. The cir- cuit illustrated above is for the lead compressor in each refriger- and circuit.
- Page 49 (see Figure 10). The pres- sure regulating valve that McQuay offers is factory set to begin opening at 58 PSIG (32F for R-22) when the air charged bulb is in an 80F ambient temperature.
- Page 50 On installations where the condensing unit is remote from the evapor- ator, it is recommended that the hot gas bypass valve be mounted near the condensing unit to minimize the amount of refrigerant that will condense in the hot gas line during periods when hot gas bypass is not required.