SECTION FOUR – Routine Maintenance and Professional Servicing
The Burner System includes the Combustion Air
Blower , the Mixer and Air Orifice, the Combination Gas
Contro l Valve, the Gas Orifice, the HSI Igniter, and the
Flameholder .
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The Combustion Air Blower is located in the front top
portion of the heater.
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The Combustion Air Blower draws combustion air in,
mixes the air and gas, and forces the air/gas mixture
into the burner. The Air Orifice, attached to the Air/Gas
Mixer inlet, meters the flow of combustion air to the
Burner. The Blower inlet is under a negative pressure,
and the Blower outlet is at a positive pressure.
To check Combustion Air Blower operation, disconnect
flexible plastic tubes at the Pressure Switch and connect
them to a differential pressure gauge. Turn gas off and
press POOL ON. When Blower starts, check differential
pressure . D if ferential should be as follows:
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SR200 3.3
SR333 2.8
SR400 2.2
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The air and gas mixtures are precisely matched
for the specific model and should not be altered except
as described under “Gas Orifice”,
Page 4-17.
Replacing the Combustion Air Blower:
1. Close the external manual gas valve.
2. Turn off the pump and all electrical power to the
heater .
3. Disconnect the Gas Valve from the Blower inlet at
the union.
4. Remove the Pipe Clamp connecting the gas pipe to
the Index Plate.
5. Disconnect the wires to the Blower at the connector.
(Continued on the next page)
4-12
Combustion Air Blower
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Fire and explosion hazard. The Air
Orifice is sized specifically for the air/gas mixture
required by the burner. Do not modify the Air Orifice
or replace it with an orifice of a different size.
Fire and explosion hazard. The
Combustion Air Blower handles a combustible air/gas
mixture. When servicing this part, check all seals for
tightness to ensure the Blower is not leaking.
P/N 42001-0206S
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