To Winterize A Heat Pump Equipped With An External Drain - Aquacal Aerotemp AT100 Owner's Manual

To Winterize a Heat Pump Equipped with an External Drain

1. Disconnect all electrical power to the heater; turn OFF circulating pump.
2. At the two (2) connection unions, disconnect the plumbing to the heater
(removal is counter-clockwise).
3. Locate the drain plug at lower, right-hand, front corner of heater. See Figure-3.
4. Using a 5/8", box-end wrench, remove the drain plug (removal is counter-
clockwise).
5. Permit all of the water to drain out of the condenser, and then replace the plug:
thread the plug in clockwise until just snug, then apply an additional 1/8 turn.
6. To prevent insects and vermin from entering the plumbing during the
winterized period, partially reconnect the two (2) plumbing connection unions:
couple each union one or two threads; this will permit condensation to drain,
but will prevent most insects and animals from entering the plumbing circuit.
7. Next Season: to ready the heat pump for use, simply re-tighten plumbing
connection unions. Hand-tight is generally sufficient.
Winterizing (Continued)
(Per Figure-3)
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