Pentair ETi 400 Installation Manual page 12

12
Gas Supply Pressure Verification and Instructions
After completing the Propane Conversion Kit Installation Instructions (page 2-12) proceed
to steps 1-12 to 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.
WARNING! Risk of fire or explosion. Never test for gas leaks with an
open flame.
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.
Table 2.
Model ETi 400
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
.2" ±.1" wc. (Since the pressure tap is connected to the low side of the gauge,
the pressure is actually negative.) If the pressure is outside the range listed,
call the factory at 1-800-831-7133. Do not try to adjust the pressure yourself.
ETi 400 Heater Fuel Gas Conversion Kit Installation Guide
Replacement Propane Orifice Size Code
P/N
476075
ID Stamp Diameter in (mm)
NL 0.253 in (6.4)