TM018 Raypak 131 Type A Pool & Spa Heaters REV: A
D.O.I: 8/04/2009
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16
Components and Their Function
Gas Valve -
An electromagnetic valve designed to control gas
flow to the burner. 131 models manufactured before 27/3/07
utilise a White Rogers 36E06-301 gas valve, models
manufactured after the 27/3/07 utilise a White Rogers 36G22-216
gas valve.
36E06-301 and 36G22-216 gas valves are equipped with a
redundant and main solenoid valve, a pressure regulator, the
36G22-216 is also fitted with an on/off switch. Both gas valves
are available in Natural Gas only and can be converted to LP
Gas; refer to page 59 for gas type conversion procedure. Note:
36E06-301 gas valves are no longer available however the
36G22-216 gas valve is a direct replacement.
The gas valve gas type can be determined by the colour of the regulator spring (bare
metal coloured spring for NG and grey/white powder coated spring for Propane).
The inlet gas pressure range is 1.1
– 3.5 kPa for Natural Gas and 2.75 – 3.5 kPa for
Propane Gas.
Hot Surface Igniter -
When energised, the hot surface igniter glows red hot and ignites
gas flowing from the burner.
Flame Sensor -
A probe utilised to detect if a flame is present. The probe projects across
the flame area of the burner and when in contact with the flame produces a DC current
(µA) which is detected by the ignition module.
Burner Manifold -
A pipe fitted with a series of injectors which deliver gas from the gas
valve to the burner.
Burner -
A series of bars connected to the burner manifold and held in place by a sheet
metal surround. Each bar contains a series of holes from which air/gas mixture flows. The
burner is ignited by the hot surface igniter.
Injector -
A jet with an orifice used to deliver gas for combustion. The burner injectors are
located on the burner manifold. Injectors have a specific orifice size which is determined
by required thermal input, burner pressure and gas type.
Transformer -
An electromagnetic device that transforms the incoming power supply from
240 volts AC to 24 volts AC. The secondary voltage (24 volts AC) is utilised for operation
of the control circuit components and gas valve.
45ºC Inlet High Limit -
A normally closed temperature sensitive switch mounted on the
inlet header connection which will cut power to the gas valve if an over temperature
condition occurs. If the inlet water temperature reaches 45ºC or more, the 45ºC inlet high
limit contacts will open circuit shutting down the gas valve and burner and illuminating the
red reset button. The 45ºC inlet high limit contacts will automatically close when the
detected water temperature drops to 35ºC however heater operation cannot continue until
the heater is manually reset. Refer to sequence of operation on page 12 for more
information.
36G22-216
