Gas outle
t
Coils for gas valves
Gas inlet
Burner pressure
Inlet pressure
ELECTRICAL TESTS AND SERVICE PROCEDURES
Page 43
Service Manual TDR8 P Gas form 9124023 rev. 01/2022
GAS BLOCK HONEYWELL TYPE VK4115V - 2004
Gas inlet:
Inlet of gas after gas pressure reduction valve (max. 55 mbar or 22“ H2O). Pres-
sure depending of gas type (see table on page 38).
Gas outlet: Outlet of gas into gas mixture blower.
Coils:
2 Coils for the gas valves.
Inlet pressure: Measuring tube (during operation) for gas pressure after reduction valve. In
order to measure loosen the screw on inside of tube.
Outlet or burner pressure: Measuring tube of gas going into gas mixture blower. In order to
measure loosen the screw on inside of tube.
Measuring notes:
1. Inlet pressure: During operation you measure the pressure of the setting of the reduction
valve.
2. Outlet pressure: During operation you measure a pressure of zero.
You can use this measuring point also to check if the gas valves are opening. When you start
up the machine and the valve is not openend yet you measure a underpressure due to the
suction of the gas mixture blower and this pressure will be zero when the valve is opened.
