HTP EL-399 - Manual (Page 43)

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LP- 293 REV. 5.20.14
6. Sealing compound must be approved for gas connections. Care must be taken when applying compound to prevent blockage or
obstruction of gas flow which may affect the operation of the unit.
Failure to apply pipe sealing compound as detailed above could result in substantial property damage, severe personal injury, or death.
Never use an open flame (match or lighter) to check for gas leaks. Use a soapy solution to test connection. Failure to use a soapy
solution test or check gas connection for leaks can result in substantial property damage, severe personal injury, or death.
Use two wrenches when tightening gas piping at the boiler: One to prevent the boiler gas line from turning. Failure to prevent the boiler
gas connection from turning could result in damage to the gas line components, substantial property damage, severe personal injury, or
death.
CSA / UL listed flexible gas connections can be used when installing the boiler. Flexible gas connections have different capacities and
must be sized correctly for the connected boiler firing rates. Consult with the flex line supplier to assure the line size is adequate for the
job. Follow local codes for proper installation and service requirements.
C. CHECK INLET GAS PRESSURE
The gas valve is equipped with an inlet gas pressure tap that can be used to measure
the gas pressure to the unit. To check gas pressure, perform the steps listed below:
1. IMPORTANT! Before you connect to the inlet pressure, shut off the gas and electrical
power to unit.
2. Loosen the pressure tap with a small screwdriver. Refer to Figure 24 for location.
3. Each unit is equipped with a needle valve that will accept a 5/16 ID hose to connect
to a digital manometer or liquid gauge designed to measure incoming pressure from 0-
35” w.c. See Figure 24.
4. Turn on the gas and power up the unit.
5. Put the unit into manual test mode (details on test mode are in Part 10 Section D). In
service mode, monitor pressure to assure it does not drop below 1 inch from its idle
reading. If gas pressure is out of range or pressure drop is excessive, contact the gas
utility, gas supplier, qualified installer, or service agency to determine correct action that
is needed to provide proper gas pressure to the unit. If Gas Pressure is within normal
range proceed to Step 6.
6. Exit test mode, then turn power off and shut off gas supply at the manual gas valve
before disconnecting the hose from the gas monitoring device. Tighten screw on the
pressure tap and turn gas on. Check for leaks with soapy solution. Bubbles will appear
on the pipe to indicate a leak is present.
Ensure the pressure tap screw is properly tightened to prevent gas leaks.
Failure to do so could cause substantial property damage, severe personal
injury, or death.
The gas piping must be sized for the proper flow and length of pipe to avoid pressure
drop. The gas meter and regulator must be properly sized for the total gas load. If you
experience a pressure drop greater than 1" w.c. (.87 kPa), the meter, regulator or gas
line may be undersized or in need of service. You can attach a manometer to the
incoming gas drip leg after removing the cap. The gas pressure must remain between
3.5" (.87 kPa) and 14" (3.5 kPa) during stand-by (static) mode and while in operating
(dynamic) mode.
Figure 23 – LP-205-W