Munchkin HIGH EFFICIENCY HEATER with the "925" Controller - Manual (Page 37)

37
G. TEST MODE
This function is intended to simplify the gas valve adjustment if needed. Listed below are the
recommended limits on each Munchkin Heater and the Combustion Settings. Automatic modulation
does not take place when the controller is in Test mode, only temperature limitation based on the
Munchkin Central Heating set point. The user will be allowed to increase or decrease the fan speed
by pressing in either the
S1/- or S2/+ keys.
To activate the Test mode simply press the S2/+ and S3/Program key together for 1 second. Once
activated, you will see in the display Ser and the actual fan speed. The measurement of the
combustion levels should always be taken at the highest and lowest fan speed. After 10 minutes, the
Test mode stops automatically. To exit Test Mode press
S1/- and S2/+ key together for 1 second.
H. TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if service is to be performed.
3. Remove the front cover.
4. Turn gas shutoff valve to "off".
5. Install front cover.
START-UP PROCEDURES / SERVICING
Fig. 6-2
DANGER
Water temperature over 125 degrees F. can cause severe burns
instantly, or death from scalds. Children, disabled, and elderly
are at highest risk of being scalded. See instruction manual
before setting temperature at water heater. Feel water before
bathing or showering! Temperature limiting valves are available.
Fig. 6-1
COMBUSTION SETTINGS
HIGH FIRING RATES and LOW FIRING RATES ON ALL MODELS
Natural Gas Propane LP
Carbon CO ppm Monoxide
Carbon CO
2
% Monoxide
low high low high
0–20 ppm 70 ppm–135 ppm 0–20 ppm 80–150 ppm
8-1/2% – 9-1/2% 8-1/2% – 9-1/2% 9-1/2% – 10-1/2% 9-1/2% – 10-1/2%