A.O. Smith BT- 80 Instruction Manual download pdf (Page 9)

FIGURE 6-THERMOSTAT FOR NATURAL AND

PROPANE GASES

GAS PRESSURE REGULATOR

The gas pressure regulator is built into the gas valve and is equipped

to operate on the gas specified on model and rating plate. The

regulator is factory adjusted to deliver gas to burner at correct water

column pressure allowing for a nominal pressure drop through the

controls.

The minimum gas supply pressure for input adjustment must not be

less than 5.0" W.C. (1.24 kPa) for natural gas and 11.0" W.C. (2.74

kPa) for propane gas.

Do not subject the combination gas valve to inlet gas

pressures of more than 14.0" w.c. (3.48 kPa). A service regulator is

necessary if higher gas pressures are encountered.

Gas pressure specified in Table 2, refer to flow pressure taken at

pressure tap of automatic gas valve while heater is operating.

OPERATION

It is recommended that a qualified person perform the initial firing of

the heater. At this time the user should not hesitate to ask the

individual any questions which he may have in regard to the

operation and maintenance of the unit.

WARNING

DO NOT ATTEMPT TO OPERATE WATER HEATER WITH COLD

WATER INLET VALVE CLOSED.

NEVER OPERATE THE HEATER WITHOUT FIRST BEING

CERTAIN IT IS FILLED WITH WATER AND A TEMPERATURE AND

PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF VALVE

OPENING OF THE HEATER. DO NOT ATTEMPT TO OPERATE

HEATER WITH COLD WATER INLET VALVE CLOSED.

TO OPERATE THE WATER HEATER

1. Close the heater drain valve by turning handle clockwise .

2. Open a nearby hot water faucet to permit the air in the system

to escape.

3. Fully open the cold water inlet pipe valve allowing the heater

and piping to be filled.

4. Close the hot water faucet as water starts to flow.

5. The heater is ready to be operated.

A checklist is included in the SERVICE INFORMATION section of

this manual. By using this checklist the user may be able to make

minor operational adjustments and save himself unnecessary

service calls. However, the user should not attempt repairs which

are not listed in this section.

PURGING

Gas line purging is required with new piping or systems in which air

has entered.

CAUTION

PURGING SHOULD BE PERFORMED BY PERSONS

EXPERIENCED IN THIS TYPE GAS SERVICE. TO AVOID RISK

OF FIRE OR EXPLOSION, PURGE DISCHARGE MUST NOT

ENTER CONFINED AREAS OR SPACES WHERE IGNITION CAN

OCCUR. THE AREA MUST BE WELL VENTILATED AND ALL

SOURCES OF IGNITION MUST BE INACTIVATED OR REMOVED.

TABLE 2.

MANIFOLD PRESSURE SETTING

Model Type of Manifold

Number Gas Input Pressure

BT-80 Natural 75,100 Btu/Hr 22 kW 4.0 in. W.C. 1.0 kPa

BT-80 Propane 75,100 Btu/Hr 22 kW 10.0 in. W.C. 2.5 kPa

BT-100 Natural 75,100 Btu/Hr 22 kW 4.0 in. W.C. 1.0 kPa

BT-100 Propane 75,100 Btu/Hr 22 kW 10.0 in. W.C. 2.5 kPa

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 19 20

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A.O. Smith BT- 80 Instruction Manual Page 9

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