Sequence Of Operation - Raypak 131 Service Instructions Manual

Sequence of Operation

1. MODELS MANUFACTURED PRIOR TO 14/4/09: When power is supplied to the
heater for the first time or power is removed and restored, the red reset button will
illuminate indicating that the heater requires resetting. The red reset button is required
to be pushed and released to reset the heater which will then be ready for operation.
Actuation of the red reset button energises relay 1 which causes the reset indicator
lamp to extinguish. Sequence of operation beyond this point assumes that the heater
has been successfully reset.
2. Manual operation of the controller power button turns the controller on to the last mode
of operation. Actuation of the pool/spa pump causes water to flow through the heater.
The resulting water pressure causes the pressure switch contacts to close enabling
operation of the control board gas valve output which at this stage is de-energised.
3. If the water temperature detected by the water temperature probe is 1ºC or less than
the control board set point temperature, the control board will initiate a call for heat and
supply power to relay 2 which will energise and supply power to the RAM ignition
module via the normally open contacts of relay 2 (which closed when the control board
called for heat), relay 1 (which closed in step 1 when the reset button was operated),
and the normally closed contacts of the 55ºC outlet high limit (for grey boards also via
the water pressure switch contacts).
4. When power is supplied to the RAM ignition module, the ignition module will perform
an internal check to ensure that it is functioning correctly. If the internal check fails the
ignition module will „lock out‟ and require resetting by turning the controller off for 5
seconds and then turning the controller back on again. If the ignition module is reset in
this manner operation will recommence from step 4.
5. If the ignition module internal check is successful, the ignition module will check the
flame sensor to ensure a flame is not present. If a flame is present a DC current (µA)
will be generated by the flame sensor and will be detected by the ignition module
which will „lock out‟ and require resetting by turning the controller off for 5 seconds and
then turning the controller back on again. If the ignition module is reset in this manner
operation will recommence from step 4.
6. If a flame is not detected in step 5, the ignition module will energise the igniter (which
will glow red hot) and then perform a second flame sensor check to ensure a flame is
not present. If a flame is present a DC current (µA) will be generated by the flame
sensor and will be detected by the ignition module which will „lock out‟ and require
resetting by turning the controller off for 5 seconds and then turning the controller back
on again. If the ignition module is reset in this manner operation will recommence from
step 4.
7. If a flame is not detected in step 6, and when the ignition module detects an igniter
current draw of > 1.4 amps, the ignition module will energise the gas valve which will
open supplying gas to the burner which is ignited by the hot surface igniter. This type
of ignition is termed HSI (hot surface ignition).
TM018 Raypak 131 Type A Pool & Spa Heaters REV: A
D.O.I: 8/04/2009
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