Page No 34 of 52 Reznor, RHC21 8000 Installation EN May 2021 D301319 Issue 0
7 Removal and replacement
of parts
RHC21 8000 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 8045-09, 8060-12, 8075-09, 8125M15
(2 off), 8150M18 (2 off) and 8175M21 (1 off)
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
RHC21 models 8045-09, 8060-12, 8075-
09, 8125M15 (2 off valves) and 8175M21
(1 off valve) and 4 screws on RHC21 models
8100-12, 8175M21 (1 off valve) and
8200M24 (2 off valves). To gain access to
the venturi fixing screws on the gas valves
for the RHC21 models 8100-12, 8175M21
(1 off valve) and 8200M24 (2 off valves), the
combustion fan must be first removed.
RHC21 8045-09, 8060-12, 8075-09, 8125M15
(2 off), 8150M18 (2 off) and 8175M21 (1 off)
gas valve fixing screws
3 off Fixing
screws
Combustion
fan
Gas
valve
Union
Fixings
8mm nuts
8mm nuts
