Aquacal H/AT100R - Manual (Page 26)

26
Winterizing a Heat Pump Equipped with an Internal Drain
(Continued)
Winterizing a Heat Pump Equipped with an External Drain
(Per Figure-3, on page following)
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 counterclockwise).
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 counterclockwise).
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 retighten plumbing connection unions. Hand-tight
is generally sufficient.
Figure 1
Figure 2
Drain Plug
Internal Winterizing Drain
On the side
On the side
On the side