5.5 Time sequence diagram, gas use, without ignition gas
Time sequence diagram for gas US ver. 1
CPI
Closed Position Indicator
X20 + X21
Flame signal
POC Proof of Closure
X32
Air damper
X07 Boiler safety locking circuit
X33
Gas regulating valve
X06 Gas-firing safety locking circuit
X04
Ignition transformer
X10 Burner ON
X01
Gas valve 1 (gas side)
X05 Gas pressure > min.
X25
Fan ON
X08 Air pressure monitor
X24
Fault
5.6 Operation description, gas use
Prerequisites for start-up
● Control switch is in flame position
or in position 2.
● Fuel selector switch in position 2 (GAS).
● Failures and interlocks are reset.
● Limit switch on burner flange and gas pressure switch (X06) are closed.
● Boiler safety equipment is reset (X07: temperature and pressure limit switch, dry-
boiling preventer, boiler flange limit switch).
● The control unit is in standby state.
● Remote control contacts are closed (X10).
● Boiler thermostat/pressure switch contact is closed (X10).
● Differential air pressure switch contact is open (X8).
● Load controller module start-up limit reached.
M5164 1640EN
69 (95)
Summary of Contents for GKP-50 MH
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