Gas Pressure Regulator; Operation; To Operate The Water Heater; Purging - A.O. Smith BT- 80 Installation & Operating Instructions Manual

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
Model
Number
BT-80
BT-80
BT-100
BT-100
TABLE 2.
MANIFOLD PRESSURE SETTING
Type of
Gas
Natural 75,100 Btu/Hr
Propane 75,100 Btu/Hr
Natural 75,100 Btu/Hr
Propane 75,100 Btu/Hr
individual any questions which he may have in regard to the
operation and maintenance of the unit.
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.
Gas line purging is required with new piping or systems in which air
has entered.
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.
Input
22 kW 4.0 in. W.C.
22 kW 10.0 in. W.C.
22 kW 4.0 in. W.C.
22 kW 10.0 in. W.C.
9
WARNING

PURGING

CAUTION
Manifold
Pressure
1.0 kPa
2.5 kPa
1.0 kPa
2.5 kPa
.