Installation / Operation Instruction Manual

Water Connections continued-

2. If this water heater is installed in a closed water supply

system, such as one having a back-flow preventer in the

cold water supply, provisions must be made to control

thermal expansion. DO NOT operate this water heater in

a closed system without provisions for controlling thermal

expansion. Warranties do not cover damages from

thermal expansions such as pressure bulges and/or

deformities. A properly sized expansion tank will alleviate

most problems. Your water supplier or local plumbing

inspector should be contacted on how to control this

situation.

3. After installation of the water lines, open the main water

supply valve and fill the water heater. While the water

heater is filling, open several hot water faucets to allow

air to escape from the water system. When steady

streams of water flow through the faucets, close them

and check all water connections for possible leaks.

4. NEVER OPERATE THE WATER HEATER WITHOUT

FIRST BEING CERTAIN THAT IT IS FILLED WITH

WATER.

INSTRUCTIONS FOR BOILER CONNECTIONS

The indirect-fired heater connection labeled “To Boiler Return”

should be piped to the boiler return piping as close to the boiler

as possible and especially after any flow control or check

valves in the space heating return piping. The use of a union

and a shut-off valve is recommended. The use of a flow control

or check valve is required to prevent back flow through the

water heater during operation of the space heating system.

Pipe and fittings between the boiler and indirect-fired water

heater should be ¾” diameter or larger.

CAUTION

Maximum boiler water supply temperature to the indirect

heat exchanger must not exceed 240°F (116°C).