Reznor, RHC21 4000 Installation EN May 2021 D301334 Issue 0 Page No 29 of 56
Reset switch and status lights
5.12 To turn the air heater OFF for
short periods
Adjust the room thermostat to its lowest setting
or ‘OFF’. The fan will continue to run to cool the
heater and then switch OFF automatically (or
follow the instructions of the air handling unit).
To relight, reset the thermostat.
5.13 To turn the air heater OFF for
long periods
Adjust the room thermostat to OFF or its
lowest setting. When the fan has stopped, turn
OFF the gas supply and then switch OFF the
electricity supply to the air heater (or follow the
instructions of the air handling unit).
Gas and electricity must only be turned off in
case of emergency or for prolonged periods of
shutdown.
Standby
Pre-purge
Ignition
Stabilisation
Unit is functioning
General lockout
Lockout due to LC3 over temperature
Figure 9 LED Status
Burner
On light
LED
status
light
Lockout reset
switch
Lockout
indication
light
