TT-S
ERIES
I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
82 of 198
FIGURE 69: XL Manifold 1000 - 5000 MBH 1" - 2" NPT
PILOT GAS REGULATOR
CONTROLS THE AMOUNT OF
GAS FLOW TO THE
BURNER'S PILOT TUBE.
POSITION INDICATINGMAIN
GAS SOLENOID VALVE.
OPENS & CLOSES ALLOWING
GAS TO FLOW TO THE BURNER.
PILOT SHUT-OFF COCK
MANUAL SHUT OFF THAT ISOLATES
THE PILOT GAS ASSEMBLY FROM
THE MAIN GAS SUPPLY.
PILOT SOLENOID VALVE.
ALLOWS GAS TO FLOW TO
THE BURNER PILOT.
POSITION INDICATING BLOCK
GAS SOLENOID VALVE.
SECONDARY BACK-UP VALVE TO
PREVENT GAS FROM REACHING
BURNER DURING SHUTDOWN.
METERING VALVE.
CONTROLS THE FLOW OF
GAS TO THE MAIN BURNER
& TO SET THE HIGH & LOW
FIRE ON THE BURNER.
HIGH GAS PRESS. SWITCH
PROTECTS AGAINST EXCESSIVE GAS
PRESSURE
LOW GAS PRESS. SWITCH
PROTECTS AGAINST
INSUFFICIENT GAS
PRESSURE.
VENT VALVE.
VENTS GAS THAT IS TRAPPED
IN THE MANIFOLD BETWEEN
THE MAIN & BLOCK VALVES, ON
SHUTDOWN, TO THE OUTDOORS.
Selec
tra
M
AXITROL
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