Reznor, RHC21 4000 Installation EN May 2021 D301334 Issue 0 Page No 37 of 56
7 Removal and replacement
of parts
RHC21 4000 air heaters must
only be fitted with authorised
replacement parts. These heaters
must use certificated spare parts to
comply with legislation.
7.1 Replacement of gas valve
1. Unplug the gas valve and combustion fan
power cables.
2. Disconnect the gas supply union inside the
cabinet and unscrew the gas pipe.
3. Unscrew the outer 8mm nuts securing the
combustion fan to the burner.
4. Remove the gas valve / combustion fan
assembly from the unit.
RHC21 4000 all models except 4100-12 gas
valve flange assembly
5. The gas valve can now be disconnected from
the venturi by removing the fixing screws.
There are 3 screws on the gas valves for all
RHC21 models with the exception of the
4100-12. There are 4 screws on the RHC21
model 4100-12 gas valve. To gain access to
the venturi fixing screws on the gas valve for
the RHC21 model 4100-12, the combustion
fan must be first removed.
RHC21 all models except 4100-12 gas valve
fixing screws
3 off Fixing
screws
Combustion
fan
Gas
valve
Union
Fixings
8mm nuts
8mm nuts
