Smart 40 Indirect Water Heater Manual

661A0300 - Rev B
20
Filling the Inner (Domestic Water) Tank
• Never use water heater unless inner and
outer tanks are completely filled with water.
• Inner tank must be completely filled and
pressurized before pressurizing outer 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.
Filling the Outer (Boiler Water) Tank
• Never use water heater unless inner and
outer tanks are completely filled with water.
• Inner tank must be completely filled and
pressurized before pressurizing outer tank.
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 manual air vent, located on
top of water heater.
4. Follow instructions furnished with boiler to
fill with water.
5. When tank is full, and air stops escaping,
close the manual air vent.
6. If antifreeze is used in boiler water, check
concentration. Boiler water (including addi-
tives) must be practically non-toxic, having
toxicity rating or class of 1, as listed in
Clinical Toxicology of Commercial Products
.
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.
WARNING
CAUTION
CAUTION
Water Heater Start-Up
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