PATH freewatt HDJ, Инструкция по установке, эксплуатации и обслуживанию, Страница: 42 / 68

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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:
1.
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
2.
brass drain valve when coolant achieves a safe working
temperature.
Place towel under drain valve.
3.
Verify valve’s position is OFF, slowly remove drain cap.
4.
Connect short hose to drain valve and extend to
5.
coolant container pan.
Open valve and evacuate coolant from system.
6.
Coolant tank’s cap may need to be taken off to remove
vacuum.