Page 80
When mounting the Flapper, adapter or air channel to
the door use the same star pattern method to ensure
proper fit. Using a torque wrench ensure fasteners are
tightened to 44in. lbs. (5Nm).
NOTE:
When installing the burner, make sure the flange
is aligned with the mating surface, as each is keyed to
control the fit.
Modulating Gas Valve / Venturi
The modulating gas valve consists of a valve body that
incorporates the On/Off gas flow control and a negative
pressure regulator. It provides the air/gas ratio control
in combination with the Venturi to the unit. It is designed
to operate with a gas supply pressure between 4 and
13 inches w.c. To remove the gas valve and/or Venturi,
shut off the 120 Volt power supply to the boiler. Turn off
all manual gas valves connecting the boiler to the main
gas supply line. Remove the front door of the boiler to
gain access to the gas valve and Venturi. Disconnect
the four flange bolts connecting the gas manifold pipe
to the gas valve. Remove the electrical connections to
the gas valve. Remove the bolts connecting the Venturi
flange to the blower. This allows the entire gas valve and
Venturi assembly to be removed to facilitate inspection
and cleaning.
Reassemble the valve/Venturi assembly in reverse
order, making sure to include all gaskets and O-rings.
Turn on the manual gas valves and check for gas leaks.
Turn on the 120 Volt power. Place the unit in operation
following the instructions in Section 9. Once the boiler
is operating. check for leaks again and confirm that all
fasteners are tight.
Check the appliance setup according to Section 9.
Appliance Control
The unit has an integrated control that incorporates
manual reset high limit control, operating temperature
control, modulating control, ignition control, outdoor reset
control, pump control and many other features. If any of
these features are thought to be defective, please consult
the factory for proper trouble shooting practices prior to
replacing the control. If control replacement is required,
turn off all power to the appliance and shut off all manual
Figure 49. Torque Pattern
NOTES:
SPARK IGNITOR
1.
GIANNONI #gm10-35-108-01
1.08
.18
W20131
3.1
3/16”
Ignitor Assembly
Figure 50. Burner Service
Ensure all gaskets are properly seated and the mating surfaces are clear and properly aligned. Any
leakage of heat and flue products will cause deformation and deterioration of the metals which may
result in permanent damage to the heat exchanger assembly.
When mounting the burner door to the heat exchanger first finger tighten each of the flange nuts using
a star pattern to ensure the door is properly aligning with mounting surface. Continue to snug nuts
using the star pattern and a standard wrench. Finally using a torque wrench tighten the nuts down to
44in. lbs. (5Nm).
When mounting the Flapper, adapter or air channel to the door use the same star pattern method to
ensure proper fit. Using a torque wrench ensure fasteners are tightened to 44in. lbs. (5Nm).
LAARS Heating Systems
Summary of Contents for NEOTHERM NTH
Page 4: ...LAARS Heating Systems ...
Page 36: ...Page 36 Figure 22 Hydronic Piping Single Boiler Zoning with Circulators LAARS Heating Systems ...
Page 52: ...Page 52 Figure 36 Ladder Diagram 7 H Ladder Diagram LAARS Heating Systems ...
Page 100: ...Page 100 Parts Illustration 4 Internal Components Sizes 750 850 LAARS Heating Systems ...
Page 102: ...Page 102 Parts Illustration 6 Gas Train Components Sizes 600 850 LAARS Heating Systems ...
