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7. A strainer should be placed in the supply water line just prior to the inlet of the evaporator and heat recovery
condensers. This will aid in preventing foreign material from entering and decreasing the performance of the
heat exchangers.
8. The shell-and-tube evaporator has a thermostat and electric heater to prevent freeze-up down to -28°C. Any
water piping to the unit must be protected to prevent freezing.
9. The shell-and-tube heat recovery condensers must be empty of water during the winter season, unless you fill
the water circuit with ethylene glycol.
10. If the unit is used as a replacement chiller on a previously existing piping system, the system should be
thoroughly flushed prior to unit installation and then regular chilled water analysis and chemical water
treatment is recommended immediately at equipment start-up.
11. In the event glycol is added to the water system, as an afterthought for freeze protection, recognize that the
refrigerant suction pressure will be lower, cooling performance less, and water side pressure drop greater.
System safety devices such as freeze protection and low pressure protection must be reset.
Prior to insulating the piping and filling the system, a preliminary leak check should be made.
Evaporator/Heat Recovery condenser Freeze Protection
All evaporators are equipped with electric heater thermostatically controlled that provide freeze protection down to
-28°C. However, this should not be the only method of freeze protection. Unless the evaporator and heat recovery
condensers are flushed and drained as is described below in note 4, two or more of the remaining three
recommendations must be followed as part of the system design:
1. Continuous circulation of water through the piping and the heat exchanger.
2. Filling of glycol solution in the chilled water circuit.
3. Additional insulation and heating of the exposed piping.
4. Draining and flushing the chiller vessel with air during winter season.
It is the responsibility of the installing contractor and/or on-site maintenance personnel to insure that this additional
protection is provided. Routine checks should be made to insure adequate freeze protection is maintained.
Failure to do so may result in damage to unit components. Freeze damage is not considered a warranty failure.
Summary of Contents for EWAP 800-C18AJYNN
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