Page No 36 of 52 Reznor, RHC21 8000 Installation EN May 2021 D301319 Issue 0
4. Before fitting new venturi, ensure throttle
screw is fully closed (turn throttle clockwise
for RHC21 models 8045-09, 8060-12, 8075-
09, 8125M15 (2 off valves) and 8175M21
(1 off valve) models 10-70 and anticlockwise
for RHC21 models 8100-12, 8175M21 (1 off
valve) and 8200M24 (2 off valves). Do not
overtighten.
5. Replace cork gasket (RHC21 models 8045-
09, 8060-12, 8075-09, 8125M15 (2 off
valves) and 8175M21 (1 off valve)) or o-ring
(RHC21 models 8100-12, 8175M21 (1 off
valve) and 8200M24 (2 off valves)) between
combustion fan and venturi.
RHC21 8045-09, 8060-12, 8075-09, 8125M15
(2 off), 8150M18 (2 off) and 8175M21 (1 off)
combustion fan
RHC21 models 8100-12, 8175M21 (1 off valve)
and 8200M24 (2 off valves) combustion fan
6. Refit remaining items in reverse order.
7. Follow start up and commissioning
procedure.
7.3 Combustion fan cleaning and
replacement
1. Follow steps 1 to 4 from gas valve
replacement and step 3 from venturi
replacement.
2. Clean fan body with a lint free cloth and
blow any dirt out of the wheel using
compressed air (air should not exceed 1.5
bar).
3. Check condition of fan wheel. If damaged
replace fan.
4. On RHC21 models 8045-09, 8060-12, 8075-
09, 8125M15 (2 off valves), 8150M18 (2
off valves) and 8175M21 (1 off valve) there
is a mounting plate that will need to be
transferred across to the new fan.
5. To remove unscrew the 8mm nuts.
6. Attach new gasket to fan outlet flange (all
models) and fit mounting plate (8045-09,
8060-12, 8075-09, 8125M15 (2 off valves),
8150M18 (2 off valves) and 8175M21 (1 off
valve))
7. Refit remaining items in reverse order.
8. Follow start up and commissioning
procedure.
O-ring
Gasket
4 off 8mm
nuts
Fan outlet
flange gasket
