APC UTS6H Specifications download pdf (Page 42)

14.2 Draining Procedure

It may be necessary to drain system during maintenance

operations. Follow procedure below:

NOTICE

Use caution while servicing and disposing of coolant

in proper manner. MCHP coolant is 50/50 ethylene

glycol solution and is toxic. Glycol is specially

formulated with bittering agent to discourage

ingestion.

Wait for coolant to cool down if system has been

operating. Several hours may be necessary to cool

coolant ﬂ uid to safe working temperature.

Use precautions while collecting coolant. Coolant

may ﬂ ow at high rate due to pressure in system.

Verify tubing loops are open to prevent any vacuum

effect to adversely impact draining operation. If

coolant has under 24,000 hours of operation and is

clean, reuse when reﬁ lling system.

It is recommended to evacuate lines with aid

of LOW pressure (under 5 psi) compressed air.

Alternatively, hand pump can be used.

14 - MAINTENANCE AND CLEANING

Shutdown Procedure:

Preferred Method: Set thermostat to OFF by A.

pressing Mode button until display reads OFF. Turn

SYSTEM POWER switch to off after shut down cycle

of approximately three minutes is completed.

Emergency Method: Turn SYSTEM POWER and B.

BYPASS switch to OFF. MCHP may overheat and

ﬂ ash error message due to coolant pump turning

off.

Inspect coolant connections on MCHP unit and integral

brass drain valve when coolant achieves a safe working

temperature.

Place towel under drain valve.

Verify valve’s position is OFF, slowly remove drain cap.

Connect short hose to drain valve and extend to

coolant container pan.

Open valve and evacuate coolant from system.

Coolant tank’s cap may need to be taken off to remove

vacuum.

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APC UTS6H Specifications Page 42