HTP ELP-199 - Manual (Page 43)

43
LP-294 REV. 2.20.14
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 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 boiler firing rates. Consult with the flex line supplier to assure line size is adequate. 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 boiler. 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 boiler.
2. Loosen the pressure tap with a small screwdriver. Refer to Figure 23 for
location.
3. Each boiler 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 23.
4. Turn on the gas and power up the boiler. Open all radiators to ensure full heat
load.
5. Put the boiler into Installer Menu 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
boiler. 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.
Gas piping must be sized for proper flow and length of pipe to avoid pressure drop. The gas meter and regulator must be properly sized
for 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. Gas pressure must remain
between 3.5" (.87 kPa) and 13" (3.23 kPa) during stand-by (static) mode and while in operating (dynamic) mode.
If an in-line regulator is used, it must be installed a minimum of 10 ft 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 conven-
tional gas valve under any circumstances.
Figure 23 - Boiler Gas Valve