Condensing Heat Exchanger Unit; Adjusting Co2 - Bosch GWH C 800 ES Installation Instructions Manual

6.4

Condensing heat exchanger unit

The condensing heat exchanger unit must be checked
once a year by a qualified and trained technician. If
repairs are needed, the repairs should be done by a cer-
tified Bosch technician.
Fig. 59 Condensing heat exchanger unit
Condensing heat exchanger unit maintenance;
B Shut off power. Disconnect power cord.
B Dismantle all inlet, outlet pipes and the condensate
tube from the condensing heat exchanger unit.
B Remove the condensing heat exchanger unit from
the appliance by pulling it towards you.
B Dismantle all parts for inspection and cleaning.
Fig. 60 Condensing heat exchanger
B Check the condensing heat exchanger for any
obstruction.
B Flush the condensing heat exchanger unit with water.
B Check all gasket and o-rings for damage and replace
if necessary.
6 720 608 643
It is important to inspect and propely
i
replace the gaskets and o-rings.
B Assemble the condensate unit and all other parts in
reverse order of disassembly.
6.5 Adjusting CO
The CO can only be adjusted by a certified gas
2
technician with a calibrated CO
CO adjustment
i 2
installations above 2,000ft. (610m),
and in Natural Gas installations where
energy content is less than 900 BTU/
cuft, and in installations with repeated
unresolved EA and EC errors (ref. to
page 40 "Problem solving").
Caution: One factor that may affect
CO levels is improper gas pressure.
2
Please see Chapter 3.13 for the
procedure to measure gas pressure
and record your findings below:
Static Gas Pressure:
P1 Operating Pressure:
The P1 minimum operating gas pressure is 4" WC for
Natural Gas and 9" WC for Propane. Do not proceed in
adjusting CO until pressure is at or above these levels,
2
but not to exceed 14" WC.
A. Once Gas Pressure is adequate
B Press ON/OFF button to turn OFF the heater.
B Remove brass flat head screw on the exhaust collar
as seen in Fig. 61.
B Insert CO
analyzer probe into the measuring port.
2
The tip of the probe should be in the center of the flue
pipe (approx 1.5" inserted). Avoid air gaps between
probe and measuring port as they can alter readings.
Fig. 61 Measuring port
Maintenance and service
2
analyzer.
2
is required in
" WC
" WC
33