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2.
Diaphragm Gas Valve
This valve is the main gas valve. A separate gas
pressure regulator must be used to regulate main burner
pressure.
3.
Motorized Gas Valve
With the motorized gas valve, the main gas valve and
pressure regulator are two separate components. The
motorized gas valve is a two-piece valve. The lower
section is the valve body, which is a plunger valve. The
upper section is the actuator. The actuator has a small
built-in hydraulic system. The hydraulic system opens
and closes the valve. The motorized gas valve is a gas
valve only, and has no other functions. This gas train
requires a separate main gas pressure regulator, pilot
gas pressure regulator and pilot valve.
The boiler will be supplied with a Honeywell flame
safeguard control and an ignition transformer. With these
controls, the boiler will have a spark-ignited pilot. This
system will shut off the main and pilot gas within four
seconds of a pilot failure.
NOTE: For additional information on the gas train refer to
the assembly prints and product literature sheets (power
burner manual included).
4. Gas Supply Pipe
The gas pipe to the boiler must be at least the same size
as the gas train supplied with the boiler. DO NOT
reduce.
5.
Drip Leg
Gas supply piping must be installed with a proper drip
leg ahead of any gas train components.
6.
Gas Supply Pressure
Natural Gas: Supply pressure should be between 6" to
11" water column ahead of the gas pressure regulator.
Minimum supply pressure when the boiler is operating
should be 4-1/4" to 4-1/2" water column.
Liquid Propane: Gas supply pressure is normally 11"
water column.
WARNING: NEVER use Teflon tape on any part of the
gas train piping. This will void any warranty on the gas
train assembly.
7.
Codes & Standards
All gas piping must be done in accordance with all
applicable codes (National Fuel Gas Code, utility
company requirements, local building codes etc.).
K. Boiler Feed Systems
1.
Condensate Return Systems
a.
Make-Up Water Supply
Connect city water line to the float valve provided
with the boiler feed system.
LVS through LV3S use 1/2" NPT
11
R1-Jr through RS use 1/2" NPT
11
LV60 though LV100 use 3/4" NPT
11
R7 through R12 use 3/4" NPT
11
Install a manual shut-off valve in the water line.
b. Pump Suction Line
This is pre-piped from the factory with an isolation
valve and strainer.
c.
Pump Discharge Line
DO NOT reduce. Use 1" NPT pipe and fittings
between pump and boiler. Install two spring-loaded
check valves. Install a hand shut-off valve between
the last check valve and the boiler. Keep the
number of elbows and fittings to a minimum.
d. Condensate Return Vent
Condensate return tank must be properly vented to
atmosphere. Vent should discharge through the
roof or through a wall to the outside. Do not reduce
the vent pipe size.
•
LVS through LV3S use 1" NPT
•
R1-Jr through RS use 1" NPT
LV60 though LV100 use 1-1/2" NPT
11
R7 through R12 use 1-1/2" NPT
11
e. Overflow
Pipe to floor drain. Overflow connection should be
at least as large as the condensate return.
f.
Drain Connection
Pipe to floor drain. Install a valve in the line. 1" NPT
line is sufficient.
Solenoid Water Valve
2.
Water Pressure
a.
This system will work only if the water supply
pressure is at least 1 O psi higher than the boiler
pressure.
b. Water Inlet
Refer to the boiler assembly print for correct
connection and location of feedwater inlet.
c.
Piping
The solenoid water valve assembly shall be piped
in the following order: Y-type strainer, solenoid
valve, spring loaded check valve, globe valve, and
11
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