Testing The Heat Exchanger - Henny Penny FlexFusion FPG-221 Service Instructions Manual

Testing the heat exchanger

Prerequisite 1. Unit dead.
Preparing to measure the
pressure
Preparing for testing
a
b
a Offset measuring connection
(OUT)
2. On-site gas supply shut off.
3. Left side wall removed.
4. Unscrew the sealing screw of the pressure measurement nozzle
(OUT) on the gas solenoid valve.
5. Connect the gas pressure measurement device. Switch on digital
measurement device before connecting! The precision of the
magnetic valve should be at least 0.1 mbar.
Conducting the test
When the gas fan starts up and the gas solenoid valve is not yet
energized, a vacuum of approx. -3 mbar must be measured. If no
underpressure should be generated, there is a leak in the gas heat
exchanger or in the connection length.
Service-instructions
Fault messages & troubleshooting
b Pressure measuring device
119