WHL-016 Rev. 4.14.16
44
B. 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 35 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
to measure incoming pressure from 0-35” w.c. See Figure 35.
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). In test 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.
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 or 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.
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.
If an in-line regulator is used, it must be a minimum of 10
feet from the boiler. It is very important that the gas line
is properly purged by the gas supplier or utility. Failure to
properly purge the lines, or improper line sizing, will result in
ignition failure. This problem is especially noticeable in NEW
LP installations and empty tank situations. This situation
can also occur when a utility company shuts off service to
an area to provide maintenance to their lines. This gas valve
must not be replaced with a conventional gas valve under any
circumstances.
DO NOT adjust or attempt to measure gas valve outlet
pressure. The gas valve is factory-set for the correct outlet
pressure and requires no field adjustment. Attempts by the
installer to adjust or measure the gas valve outlet pressure
could result in damage to the valve and cause substantial
property damage, severe personal injury, or death.
Ensure that the high gas pressure regulator is as least 6 – 10
feet upstream of the appliance. Failure to do so could result
in substantial property damage, severe personal injury, or
death.
Table 13 - Gas Pipe Sizing / BTU’s per Hour
Do not do a gas conversion on this boiler without an
officially approved conversion kit and instructions supplied
by Westinghouse. Failure to use a conversion kit when
converting the boiler to fire on Natural or Propane gas will
result in extremely dangerous burner operation, leading to
fire, explosion, severe personal injury, or death.
Strain on the gas valve and fittings may result in vibration,
premature component failure and gas leakage, and result in
fire, explosion, property damage, severe personal injury, or
death.
Adjustments to the throttle screw or offset may only be made
by a qualified gas technician using a calibrated combustion
analyzer capable of measuring CO2 and CO. Failure to follow
this instruction could result in fire, explosion, property
damage, severe personal injury, or death.
Gas conversion should be performed BEFORE the boiler is
installed. Carefully follow the gas conversion instructions
when performing the conversion.
Natural gas at high altitude might contain less heating
value than typical 1,000 BTU/cu ft and therefore can cause
improper air / gas mix leading to improper combustion. For
natural gas installations above 3,000 ft, call your gas provider
to determine the heating value of the supplied natural gas.
Summary of Contents for WBC 399
Page 14: ...WHL 016 Rev 4 14 16 14 Figure 6 Boiler Dimensions NOTE All Dimensions Are Approximate 055 080 ...
Page 21: ...WHL 016 Rev 4 14 16 21 Figure 9 Piping Symbol Legend ...
Page 42: ...WHL 016 Rev 4 14 16 42 Figure 33 Internal Connection Diagram ...
Page 65: ...WHL 016 Rev 4 14 16 65 Figure 37 Combustion System Replacement Parts 55 110kBTU Models ...
Page 67: ...WHL 016 Rev 4 14 16 67 Figure 39 Combustion System Replacement Parts 155 399kBTU Models ...
