Installation / Operation Instruction Manual

Pre-installation continued-

2. Zone Valves – Select a valve with a low-pressure drop to

assure adequate flow through the water heater.

3. Hybrid – The space heating zone can be zoned using zone

valves and the indirect-fired heater zoned with a circulator.

DOMESTIC HOT WATER PRIORITY

Two options are available, Priority and Non-Priority.

1. Priority – Demand for space heating is interrupted or postponed

until the domestic hot water demand is satisfied. This option

provides maximum delivery of domestic hot water. Priority is

recommended when:

a) Boiler DOE heating capacity is 100,000 Btu per hour or less,

b) When boiler output required to satisfy domestic hot water

demand is at least 50% of the boiler output required to satisfy

space heating demand, or

c) When an interruption in space heating can be tolerated

during a long domestic hot water draw.

2. Non-Priority – Boiler output is divided between space heating and

domestic hot water heating. Delivery of domestic hot water can be

reduced during simultaneous space and domestic hot water

heating operations, depending on such factors as boiler output,

boiler over-sizing, number of space heating zones calling for heat,

and the ratio of domestic hot water load to space heating load.

Component Location

Minimum Clearance from Combustible Materials

Top

Sides

Front

Rear

0”

Table 5: Minimum Combustible Material Clearances

CAUTION

This water heater must be located in an area where leakage of the

tank, water line connections, or the temperature and pressure relief

valve will not result in damage to the area adjacent to the water

heater or to lower floors of the structure. When such locations cannot

be avoided, a suitable drain pan must be installed under the water

heater. The drain pan depth must be suitable for draining and

collecting water. The drain pan can be purchased from your plumbing

professional. The drain pan must be piped to an adequate drain. The

piping must be at least 3/4 inch in diameter and pitched for proper

drainage.