Install Instructions

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D. DRAINING INNER (DOMESTIC WATER)
TANK
(See Domestic Piping Fig. 3.1)
1. Disconnect snap set wiring connection at water heater.
a. If outer (boiler water) tank pressure is greater than
15 psig, relieve boiler pressure and close isolation
valves before proceeding.
2. Close system supply isolation valve.
3. Connect a hose to domestic water drain valve at cold
water inlet. Hose should extend to drain at floor level
to allow siphoning of domestic water tank.
4. Open hot water faucet at highest point above heater.
5. Open domestic water drain valve to start siphoning.
6. When draining is complete, close hot water faucet and
domestic water drain valve.
E. DRAINING OUTER (BOILER WATER) TANK
1. Disconnect snap set wiring connection at water.
2. Close boiler water isolation valves between boiler and
water heater.
3. Connect hose to boiler water drain valve at water
heater. Open and drain water to a safe place.
4. To speed draining procedure, loosen air vent on top
of tank.
5. When draining is complete, close drain valve and
retighten air vent.
WATER HEATER MAINTENANCE