Pentair ETi 400 Guide D'installation page 13

Gas Supply Pressure Verification and Instructions
After completing the Propane Conversion Kit Installation Instructions (page
8-12) verify the gas supply pressure as follows:
1. Use a 3/16" hex key to remove the plug from the PRESSURE TAP port
on the outlet side of the Combination Gas Control Valve.
2. Install a 1/8" NPT barbed fitting into the 'PRESSURE TAP' port on the
outlet side of the gas valve. Use a flexible tube to connect it to the low
side of a differential pressure gauge or a slope gauge. This gauge
will measure low (outlet) pressure, which requires a high degree of
resolution.
3. Turn on the manual gas shutoff valve.
4. Before operating the heater, leak-test the heater and all its gas
connections with soapy water.
5. Turn on electricity to heater and start the pump.
6. Turn on the heater.
NOTICE: If you are using a slope gauge, close the shutoff valve
of the gauge to avoid pulling the liquid out of the gauge when the
blower starts.
7. After the burner lights, verify that the supply pressure is within the range
4" to 12" wc. If the supply pressure drops below this range when the
burner ignites, the gas line capacity may be inadequate, and should be
increased.
8. With the burner still on, disconnect the plastic hose between the gas
valve and "VENT" tap and the blower mixer inlet. The pressure gauge
should then read 0.2" ±0.1" wc. If the pressure is outside the range
listed, call the factory at 1-800-831-7133. Do not try to adjust the
pressure yourself.
Table 3.
Model ETi 400
Risk of fire or explosion. Never test for gas leaks
with an open flame.
Replacement Propane Orifice Size Code
P/N
476075
ID Stamp Diameter in (mm)
NL
ETi 400 Propane Conversion Kit Installation Guide
®
0.253 in (6.4)
13