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 4.5" w.c. (1.12 kPa) for natural gas.
Do not subject the combination gas valve to inlet gas pressures of more than 14.0" W.C. (3.48 kPa) - natural gas. A service regulator is necessary if higher gas pressures are encountered.
Gas pressure specified in Table 4, refer to flow pressure taken at pressure tap of automatic gas valve while heater is operating.
TABLE 8
MANIFOLD GAS PRESSURE IN INCHES
OF WATER COLUMN (ALL MODELS*)
TYPE OF GAS
Natural
3.5 (0.87 kPa)
TABLE 9
APPROXIMATE TIME REQUIRED TO CONSUME
1 CU. FT. OF GAS AT FULL CAPACITY
|
|
| TIME REQ’D |
INPUT | TYPE | BTUH | TO CONSUME |
RATE | OF | PER 1 | CU. FT. |
(BTUH) | GAS | CU. FT. | OFGAS |
120,000 | NATURAL | 1050 | 31.5 SEC. |
154,000 | NATURAL | 1050 | 24.5 SEC. |
180,000 | NATURAL | 1050 | 21.1 SEC. |
199,000 | NATURAL | 1050 | 19.0 SEC. |
190,000 | NATURAL | 1050 | 20.1 SEC. |
250,000 | NATURAL | 1050 | 15.1 SEC. |
275,000 | NATURAL | 1050 | 13.75 SEC. |
310,000 | NATURAL | 1050 | 12.4 SEC. |
366,000 | NATURAL | 1050 | 10.4 SEC. |
390,000 | NATURAL | 1050 | 9.5 SEC. |
Figures shown are valid for
OPERATION
IMPORTANT
A qualified person must perform the initial firing of the heater. At this time the user should not hesitate to ask the individual any questions which they may have in regard to the operation and maintenance of the unit.
An Operational Checklist is included at the rear of this manual. By using this checklist the user may be able to make minor operational adjustments and avoid unnecessary service calls. However, the user should not attempt repairs which are not listed under the USER column.
GENERAL
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.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO THE APPLIANCE.
CAUTION
Before proceeding with the operation of the unit make sure the water heater and system are filled with water and all air is expelled.
FILLING
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.
WARNING
THE GAS VALVE MUST HAVE BEEN IN THE OFF POSITION FOR AT LEAST 5 MINUTES. This waiting period is an important safety step. Its purpose is to permit gas that may have accumulated in the combustion chamber to clear. IF YOU DETECT GAS ODOR AT THE END OF THIS PERIOD DO NOT PROCEED WITH LIGHTING. RECOGNIZE THAT GAS EVEN IF IT SEEMS WEAK, MAY INDICATE PRESENCE OF ACCUMULATED GAS SOMEPLACE IN THE AREA WITH RISK OF FIRE OR EXPLOSION. SEE THE FRONTPAGE FOR STEPS TO BE TAKEN.
All gas and water lines leak tested and open.
Read SEQUENCE OF OPERATION section of this manual prior to lighting and operating this appliance.
With above conditions satisfied, start the unit in accordance with the instructions on the operating label attached to the heater. For your convenience a copy of the instructions are shown of page 24. Each heater is equipped with an ignition control board. The controller will try three times to light the main burner before going into lockout. After the controller tries three times, it will wait one hour before trying to light the unit again. This cycle will continue until the main burners are ignited or the unit is shut down.
ADJUSTMENTS
ON INITIAL STARTUP SOMEADJUSTMENTS ARE NECESSARY.
1.CHECK MANIFOLD AND INLET GAS PRESSURES.
2.CYCLE CHECK - CHECK AT LEAST ONE BURNER OPERATION - WHEN THERMOSTAT IS SATISFIED, BURNER WILL SHUT OFF AND INDUCER WILL STOP RUNNING. ON CALL FOR HEAT - THE INDUCER WILL COME ON AND CLOSE THE PRESSURE SWITCH AND THE IGNITION SEQUENCE DESCRIBED ABOVE WILL BEGIN, SEE “SEQUENCE OF OPERATION”.
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