Rheem GHE 125-500A - Operation: Sequence and Performance Monitoring; Super Duty Sequence of Operation

24
works properly after installation and in the future,
it is recommended that the heater's performance
be measured and monitored. Run water out of a
faucet nearest the heater until it comes out warm.
Using a calibrated thermometer, take a measure-
ment. If the water is not at a suitable temperature
for the application, adjust the setting on the con-
trol or the tempering valve.
Operation
Date Time Person Running Test Setpoint Temperature °F Faucet Temperature °F
This log (or a similiar one) should be lled out as follows:
Figure 20
Yes
Is a request for
heat present?
Does air proving
switch close
within 60
seconds
Blower is de-energized
and error message is
displayed on control
No
Blower is energized to
pre-purged speed
Has this error
occurred 3 times in
the last 10 minutes
No
Control goes into
lockout requiring
manual reset
Yes
Blower remains energized for
pre-purge period (5 sec)
Yes
Ignitor is energized for
warm-up period (20 sec)
Gas valve is opened and ignitor
remains energized for 3 seconds
Is amed
detected
within 5
seconds
Control is
manually
reset by
pressing the
“i” button
Blower is de-energized
and control goes into
lockout requiring
manual reset
Has ignition
failed 3
consecutive
times?
No
Burner remains on and
modulates based on
sensor valve vs. setpoint
Is ame signal
still present?
Is the call for
heat satised
Yes
Has ame signal been
lost 10 times during one
call for heat?
No
Gas valve is closed and blower
goes to post-purge speed for
25 seconds
Yes
Blower is de-energized and
system goes to standby mode
Yes
No
No
Gas valve is closed and
blower goes to post-purge
speed for 25 seconds
Yes
Automatic Reset
No
Super Duty Sequence of Operation
Is the gas
pressure switch
still closed?
Are the blocked
vent switches
closed?
Yes
Yes
Has this error
occured 3 times
in the last 10
minutes?
No
No
Yes
No
Gas valve is closed and
blower goes to post-purge
speed for 25 seconds
Control goes into block error
until air/gas pressure switch
closes again (auto reset)
Gas supply pressure rises
above 6.0” W.C. or air
switch closes and clears
blocking error
No
Yes