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Part Number PLUS-E017-A/1206
PLUS LINE
Indirect-Fired Water Heaters – Series 3
1. Close boiler water drain valve at boiler water outlet of water heater.
2. Open water heater’s boiler water isolation valves.
3. Allow air to escape from outer (boiler water) tank by opening cap “A” (see Figure 7) on
automatic air vent, located on top of water heater. See the NOTICE below.
Filling the inner
(domestic water)
tank
1. Close domestic water drain valve.
2. Open domestic water isolation valves for water heater.
3. Vent air from inner (domestic water) tank by opening nearest hot water faucet. Fill domestic
water tank completely by allowing water to run until there is a constant flow of water.
4. Close hot water faucet.
• Inner tank must be completely filled and pressurized before pres-
surizing outer tank.
• Never use water heater unless inner and outer tanks are completely filled
with water.
Filling the outer
(boiler water) tank
Figure 7
Open cap on air vent to allow air
to escape from outer tank
Do not use automotive, ethylene glycol or petroleum-based antifreeze. Do
not use any undiluted antifreeze. This can cause severe personal injury,
death or substantial property damage if ignored.
Water heater start-up
A
B
6406-6
• Inner tank must be completely filled and pressurized before pres-
surizing outer tank.
• Never use water heater unless inner and outer tanks are completely filled
with water.
For proper operation of the water heater, always leave vent cap unscrewed
one full turn.
The boiler-side piping must be equipped with a diaphragm- or bladder-
type expansion tank, NOT a closed-type expansion tank.
4. Follow instructions furnished with boiler to fill with water.
5. When tank is full, air will stop escaping, and air vent will close. If air vent does not seat
properly (i.e., water leaks out), remove cap “A”. Briefly push in valve “B” (see above) and
release it to clean valve seat. Screw cap “A” on completely, then unscrew one turn.
6. If antifreeze is used in boiler water, check concentration. Boiler water (including addi-
tives) must be practically non-toxic, having a toxicity rating of Class 1, as listed in Clinical
Toxicology of Commercial Products. Inhibited propylene glycol is recommended. Follow
antifreeze manufacturer’s instructions.
A4