PVI Industries PV500-2 manual START-UPPROCEDURES AND OPERATION cont

START-UP PROCEDURES AND OPERATION (con't)

CAUTION: CONDUCT THE FOLLOWING GAS TRAIN LEAKAGE TESTS BEFORE START-UP, AT ANNUAL INTERVALS AND PRIOR TO INVESTIGATING THE CAUSE OF ANY REPORTED OCCURENCES OF DELAYED IGNITION.

1.Using an appropriate bubble detection solution, thoroughly coat all gas train pipe connections. If any bubbles are detected, the leaking connection must be tightened and tested to assure stoppage of the leak.

2.Attach a manometer. to measure gas pressure, at the manual gas shutoff valve located just upstream of the gas train. Adjust gas train inlet pressure to the specified value (e.g. 14"W.C.), and tightly close the gas train outlet manual shutoff valve.

3.Reattach the manometer to the gas train outlet manual shutoff valve and record the measured gas pressure in inches of water column (in W.C.). Measure gas pressure again after 15 minutes. If gas pressure has increased 00.5"W.C. or more, the gas leak must be isolated to one or more of the operating gas valves, for example a solenoid actuated gas shutoff valve. After any leaking valve is replaced, the reassembled gas train must be leak tested again before start-up is attempted. (NOTE: All gas valves removed because of suspected leakage must be returned to PVI Customer Service for disposition.)

Spark Ignition Systems

These systems use 120 VAC power from an external source and are equipped with transformers to reduce the voltage to 24 volts to actuate the gas valve.

At start-up or during operation when the thermostat calls for heat, the spark ignition system performs the following basic steps:

1.Opens the flue damper.

2.Activates a high voltage transformer to supply a sparking action to the pilot.

3.Opens the pilot gas valve. The pilot gas ignites from the sparking.

4.A sensor located in the pilot flame signals the control module to open the main burner gas valve. The pilot flame ignites the main burner gas. An adequate pilot flame must be present before the main burner gas valve can open.

5.When the water temperature reaches the operating thermostat setting, the control circuit opens which closes both the pilot and main burner gas valves terminating burner operation.

6. The flue damper is closed.

NOTE: The spark ignition system provides additional safety functions to close the pilot valve if the pilot flame is not established and to close the main burner valve if the pilot flame is extinguished while the burner is in operation.

WATER HEATER START-UP

NOTE: The following test equipment is required:

a.Vent temperature gauge

b.Manometer for checking gas pressure

c.Draft gauge for checking draft in vent

d.CO (carbon monoxide) tester

e.CO2(carbon dioxide) or O2 (oxygen) tester

f.Drill and ¼" drill bit for ¼" hole drilled in vent approximately 12" above draft hood outlet

NOTE: Emergency shutoff can be made by turning off the fuel inlet shutoff valve.

CAUTION: DO NOT START BURNER WITH COMBUSTION CHAMBER FULL OF GAS OR WITH VERY HOT COMBUSTION CHAMBER.

The following steps must be performed to assure that the water heater is operating safely and efficiently.

1.Read the enclosed control manufacturer's instruction sheet for start-up procedure. Allowing the pilot to ignite with the main burner gas valve turned to "off" position is required at initial start-up. The pilot flame can be visually checked for size and position. Check inlet gas pressure. It must not exceed 14"W.C. Press the control circuit switch on the front panel to "on" position. The control system will open the pilot valve allowing the pilot to ignite. Observe pilot flame. If satisfactory, open the main burner valve and main burner should ignite.

Pilot and main burner flames can be observed during adjustment and under operating conditions by using the stainless steel hand-held inspection mirror that is enclosed in the information packet that was shipped with this water heater.

If the spark ignition fails to ignite the pilot flame, refer to the control manufacturer's manual supplied with the unit.

2.Check gas pressure at the gas valve with a manometer. (See Figure 2-5.) Most gas valves have pressure taps for this purpose. Adjust gas pressure to the value shown on rating plate of the water heater.

3.Drill ¼" diameter hole in vent about 12" above draft diverter. Insert draft gauge in drilled ¼" hole. Draft in vent should be -.02" -.06" W.C.

PV500-2 06/10 4 Section 2