Rapid 2005, Installation, Operation & Service Manual

Page: 123 / 162

SECTION 1 8 : S
EQUENCE OF
O
PERATION
113 of 147
FIGURE 73: S 8 600 Flame Control (2005)
YES
Idle
(not powered)
Close Main Gas
Valve and Pilot
Gas Valve
More than
5 flame losses
in this
“Call for Heat”?
Wait for
“Call for Heat”
to be removed
A
Activate Alarm
contact(s)
(optional)
Close Main Gas
Valve and Pilot
Gas Valve
Close Main Gas
Valve and Pilot
Gas Valve
Run
Flame Lost?
“Call for Heat
ends”?
YES NO
NO
Flame
Stabilization
(2 seconds)
Open Main Gas
Valve
Close Pilot Gas
Valve
(before trial for ignition timer expires)
Spark ON
Open Pilot Gas
Valve
Trial for Ignition
(timer started)
Power to module
and self check
“Call for Heat”
received from
Thermostat
Flame
Proved?
NO
Lockout
Lockout
A
Spark OFF
Spark OFF
YES
NO
YES