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Maintenance and service
▶ Using a 3rd line (C) from the descaling reservoir, connect to the inlet
side of circulating pump. Install a filter on the end of the line in the
descaling reservoir.
▶ Make sure all connections are "water tight.".
▶ Fill tank with descaling solution so both lines inside are submersed.
We recommend a straight white vinegar solution. If using a
commercial descalant, refer to manufacturer's instructions for
proper dilution ratio.
▶ Operate the circulating pump.
▶ Make sure there are no leaks and the solution is flowing from the
descaling reservoir through the heater and returning to the reservoir.
▶ Run solution through the heater until the solution returning to the
descaling reservoir comes out clear. (Changing to a fresh solution
may be necessary during this process).
▶ Disconnect all lines and drain all solution from heat exchanger.
Properly discard of solution.
▶ Position a container below the hot water outlet and connect cold
water supply. Open cold water supply shutoff valve and flush heat
exchanger with clean water.
▶ Shut cold water shutoff valve and reconnect hot water supply to the
water heater.
▶ Reconnect electrical supply to unit, open water shutoff valves, and
return the unit to service.
Fig. 61
[1]
Pump
7.4
Adjusting CO2
The CO2 can only be adjusted by a certified gas technician with a
calibrated CO2 analyzer.
CO
adjustment is required in Natural Gas
2
installations where energy content is less than 900
BTU/cuft, and in installations with repeated
unresolved EA and EC errors (ref. to page 44
"Problem solving").
CAUTION:
▶ One factor that may affect CO
pressure. Please see Chapter4.14 for the procedure
to measure gas pressure and record your findings
below:
Static Gas Pressure:
" WC
P1 Operating Pressure:
38
levels is improper gas
2
" WC
The P1 minimum operating gas pressure is 3.5" WC for Natural Gas and
8" WC for Propane. Do not proceed in adjusting CO
or above these levels, but not to exceed 10.5" WC for Natural Gas and
13" WC for Propane.
A. Once Gas Pressure is adequate
▶ Press ON/OFF button to turn OFF the heater.
▶ Remove brass flat head screw on the exhaust collar as seen in Fig.62.
▶ Insert CO
analyzer probe into the measuring port. The tip of the
2
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. 62 Measuring port
▶ Press the ON/OFF button to turn ON the heater.
▶ Immediately following, press and hold simultaneously buttons
or
and
for 3 seconds, until display reads P2.
P
Fig. 63
▶ Press
button until "P1" appears on display.
B. Measuring CO
(Combustion cover Installed):
2
▶ Open all hot water taps to achieve a flow rate of at least 6 gpm. (1 tub
and 2 sinks should be sufficient). If heater display reverts back to P2,
open more hot water fixtures to allow sufficient flow. Press + until P1
reappears on the display.
▶ Record the CO
reading in P1 below. (Analyzer reading may take
2
several minutes to stabilize).
▶ Press the '+' button until P2 appears. Unit will ramp down to low fire
and the water flow should decrease.
▶ Record the CO
reading in P2 below.
2
P1 CO
Reading:
% CO
2
P2 CO
Reading:
% CO
2
Note: When making adjustments, make sure combustion cover is
installed.
until pressure is at
2
2
2
RTG 199 ME – 6 720 811 615 (2015/04)
+
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