PVI Industries PV500-2 用户手册

 

 
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. CO

2

(carbon dioxide) or O

2

 (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 

 

 
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.