Standard Operating Conditions; Auto Random Re-Start Function - McQuay D series Installationsanleitung

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1. Charging procedures – Single phase compressors

Evacuate the system to 500 microns Hg. (67Pa). To reduce evacuation time, use short, large diameter hoses and connect to unrestricted

service ports on the system. Quality of vacuum cannot be determined by time – a reliable vacuum gauge must be used. (etc. electronic

vacuum gauge)

Turn the refrigerant cylinder upside down, purge the charging hose and charge liquid through the liquid line charging port until refrig-

erant no longer flows or until the correct charge has been weighed in. If additional charge is required start the system and slowly bleed

liquid into the suction side until the system is full.

Copeland recommends charging liquid in a CONTROLLED manner into the suction side until the system is full. This recom-

mendation does not hold true for reciprocating compressors where liquid charging into the suction side could cause severe damage.

Carefully monitor the suction and discharge pressures – ensure that the suction pressure does not fall below 25 psig (1.7 bar) at any time

during the charging process.

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Manifold Gauge will show cylinder pressure rather than suction pressure if the cylinder valve and Manifold valve "A" are

both open.

2. Charging procedures – Three phase compressors

The fundamental procedure is the same as for single phase models but the compressor can run in the wrong direction on starting. If this

happens reverse any two phases and start again. Short term reverse rotation will not damage the compressor.

All Specter compressors (Model: ZR90 to ZR19M) have internal discharge temperature protectors which are very effective in preventing

dangerously high discharge temperatures during charging. The protection module will trip and lock the compressor out for 30 minutes.

It is not normally necessary to wait 30 minutes for the module to reset. When the compressor has cooled down the module can be reset

by breaking the power supply to the control circuit. Very often the serviceman does not understand why the module tripped and uses a

jumper wire to bypass it. He continues to charge the system and removes the jumper when charging is complete. The compressor may

or may not run with the protector back in the circuit but it is certain that the compressor has been damaged and premature failure is

inevitable.

Cooling

Temperature

Minimum indoor

temperature

Maximum indoor

temperature

Minimum outdoor

temperature

Maximum outdoor

temperature

Ts: Dry bulb temperature.

Th: Wet bulb temperature.

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Disconnect from the main power supply before servicing the air conditioner unit.

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DO NOT pull out the power cord when the power is ON. This may cause serious electrical shocks which may result in fire hazards.

If there is a power cut when the unit is operating, it will automatically resume the same operating mode when the power is restored.

(Applicable only to units with this feature)

Before turning off the power supply, set the remote controller's ON/OFF switch to the "OFF" position to prevent the nuisance tripping of the unit.

If this is not done, the unit's fans will start turning automatically when power resumes, posing a hazard to service personnel or the user.

Caution

There are many ways of charging liquid in a "controlled manner" into the suction side:-

1. Use valve A on the manifold gauge set

2. Use the valve on the refrigerant cylinder

3. Charge through a Shredder valve

4. Use a hose with a Shredder valve depressor

5. Charge into the suction side at some distance from the compressor

6. All of the above