McQuay seasoncon ALP-067A Installation And Maintenance Data Download Page 36 | Manualshive

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Summary of Contents for seasoncon ALP-067A

Page 1: ...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 Minneapoli...

Page 2: ...ce 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 i...

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Page 4: ...eported to the carrier and a claim should be filed The unit serial plate should be checked before unloading the unit to be sure that it agrees with the power supply available INSTALLATION Handling Car...

Page 5: ...ow parallel to the unit length thus minimizing effects on condensing pressure If it is not practical to orient the unit in this manner a wind deflecting fence should be consi dered It is also necessar...

Page 6: ...while servicing low voltage opera tional controls All resettable or adjustable controls are located just below the main control center There is one resettable control enclosure on each side of the uni...

Page 7: ...unit sizes 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...

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Page 9: ...All piping piping components are by others Evaporator Below Condensing Unit Figure 7 shows an installation where the evaporator is installed be low the condensing unit It is shown for an air handling...

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Page 14: ...G OFF SEASON REFRIGERANT CIRCUIT 2 SAFETY AND OPERATING CONTROLS UNIT CONDENSER FANS OPERATING CONTROLS POWER SUPPLY FOR CONTROLS I 1 I I I PUMP STARTER PUMP STARTER CIRCUIT R9 RIO NOTE CIRCUIT SHOWN...

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Page 18: ...LOW TO ACTIVATE INCHES SWITCH GPM 1 6 00 1 l 4 9 80 1 l 2 12 70 2 18 80 2 l 2 24 30 3 30 00 4 39 70 5 58 70 6 79 20 FLOW DIRECTION MARKED ON SWITCH 1 00 NPT FLOW SWITCH CONNECTION G O Nl AFTER SWiTCH...

Page 19: ...nel from high voltage starting controls while servicing low voltage operational controls Below the upper enclosure are two smaller separate enclosures that contain 115 volt adjustable or resettable co...

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Page 22: ...nergize compressor contactor Ml starting compressor number 1 Closing relay R9 contacts also energizes con denser fan relay R17 Closing its contacts and providing power to condenser fan motor contactor...

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Page 37: ...al and electrical inspections have been completed per local codes See that all auxiliary control equipment is operative and that an adequate cooling load is available for initial start up Initial Star...

Page 38: ...nect switches to warn against start up be fore opening the compressor suction and discharge valves Start Up After Extended Shut Down 1 2 3 4 5 6 7 8 9 Inspect all auxiliary equipment pumps fans etc to...

Page 39: ...uire the addition of grease at the time of installation Periodically the ball bearings should be cleaned and the grease renewed to gain the ultimate in service from the motor bearings Extreme care mus...

Page 40: ...ement inside the sight glass indicates what moisture condition corresponds to a given element color If the sight glass does not indicate a dry con dition after a few hours of operation the unit should...

Page 41: ...enoid valve the unit must be pumped down by use of the manual liquid line shutoff valve Thermostatic Expansion Valve The expansion valve is responsible for allowing the proper amount of refrigerant to...

Page 42: ...chemrcally 3 Clogged liqurd lrne filterdrier 3 Replace cartridge s Low Suction 4 Clogged suction line or compressor suction 4 Clean strarners Pressure gas strainers 5 Expansion valve malfunctioning 5...

Page 43: ...ed fac tory service personnel of McQuay Inc at Mpls MN A Return Goods tag will be sent to be included with the returned material Enter the information as called for on the tag in order to expedite han...

Page 44: ...ns the safety relay is de energized the voltmeter read ing will rise to 115V and the compressor contactor should open Re peated operations of the control will cause a slight heat buildup in the bimeta...

Page 45: ...enser pressure in refrigerant circuit No 1 and one which senses pressure in refrigerant circuit No 2 The third fan No 13 3 fan units only is controlled by a pair of parallel wired temperature switches...

Page 46: ...the damper blades at 170 5 PSIG and to be fully open at 250 2 10 PSIG To check the damper blade operator pressure settings the unit should be started with the fuses removed from fans 11 and 13 on 3 fa...

Page 47: ...thermostat the low ambient start relay is also energized through the time delay The relay has contacts that essentially short circuit the low pres sure control and allow the compressor to start with t...

Page 48: ...e delay period has expired the compressor will not re start After 5 minutes the time delay will close its contacts to complete the circuit and be ready for start up The time delay opens its contacts w...

Page 49: ...m McQuay under ordering number 886 321262B 02 for ALP units 067AS D through 159AD The solenoid valve should be wired to open whenever the unit thermo stat calls for the first stage of cooling see Figu...

Page 50: ...must be pumped down by using the manual liquid line shutoff valve If the problem can be traced to the power element only it can be unscrewed from the valve body without removing the valve but only aft...

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