Nortec Industries GS Series - Manual (Page 37)

with a new burner. Inspect and replace any
gaskets that may be damaged. Tighten the 4
brass nuts of burner mounting plate to a
torque of 95 in-lb.
8. Leak test the gas train before
re-commissioning the humidifier.
Removal and Installation of the Combustion
Blower
1. Shut off electrical power and gas supply to the
humidifier.
2. Remove the right side service access door.
3. Disconnect all wiring to the combustion
blower, gas valve and air proving switch (note
the connector assignment).
4. Undo the coupling on the flexible gas hose
and disconnect the gas hose from the gas
valve.
5. Undo the 2 screws that mount the gas
valve/air inlet assembly to the blower and
remove the assembly.
6. Undo the 2 screws of the fan-board mounting
bracket (if present) and remove bracket,
leaving electronic board and igniter jump start
module(s) attached.
7. Undo the 4 nuts on the blower outlet and
remove blower.
8. Reverse the sequence above to install the
new combustion blower. Inspect and replace
any gaskets that may be damaged. When
mounting the gas valve/air inlet assembly to
the combustion blower, ensure that the cork
gasket is properly oriented or gas flow through
the valve will be impeded.
9. Leak test the gas train before
re-commissioning the humidifier.
Gas Valve Replacement
1. Shut off electrical power and gas supply to the
humidifier.
2. Remove the right side service access door.
3. Disconnect all wiring to the gas valve and air
proving switch (note the connector
assignment).
4. Undo the coupling on the flexible gas hose
and disconnect the gas hose from the gas
valve.
5. Remove the hoses from the air proving switch
(note the connection layout).
6. Undo the 2 screws that mount the gas
valve/air inlet assembly to the blower and
remove the assembly.
7. Undo the 4 screws and remove the gas pipe
connection from the inlet of the gas pressure
regulating valve.
8. Undo the 3 screws that hold the air inlet
venturi to the gas valve. Remove the rubber
grommet and brass orifice mounted in the
outlet of the gas valve.
9. Undo the 3 screws of the pressure switch
support bracket and remove the assembly
from the gas valve.
10. Reverse the sequence above to install the
new gas pressure regulating valve. Inspect
and replace any gaskets that may be
damaged. When mounting the gas valve/air
inlet assembly to the combustion blower,
ensure that the cork gasket is properly
oriented or gas flow through the valve will be
impeded.
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Figure #29
Combustion Blower Replacement