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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

Содержание seasoncon ALP-067A

Страница 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...

Страница 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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Страница 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...

Страница 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...

Страница 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...

Страница 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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Страница 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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Страница 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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Страница 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...

Страница 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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Страница 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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Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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