Munchkin HIGH EFFICIENCY HEATER with the "925" Controller - Manual (Page 36)

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12. If the appliance will not operate, follow the instructions “To Turn Off Gas To Appliance”
Section E and call your service technician or gas supplier.
E. ADJUSTING THE TEMPERATURE ON THE MUNCHKIN DISPLAY:
1. Before you can change the temperature from the factory setting of 180 degrees. You must make
sure that none of the thermostats are calling for heat. The Munchkin controller will not memorize a
program setting while in a heating cycle. To adjust the temperature to the Munchkin simply press in
the
S3/Program key for three seconds until you see a flashing (C) then an alternate value of (180).
This number is the factory set point of the unit, which is 180 degrees. To change the temperature,
simply push either the
S1/– or S2/+ on the display. The S1/– button will decrease the tempera-
ture while the S2/+ will increase the temperature of the Munchkin. The temperature of the
Munchkin can be set as low as 50 Degrees and as high 203 Degrees. These ranges are your maxi-
mum and minimum ranges of the Munchkin. In addition to changing the temperature you are also
allowed to change three more settings in this model (1. Munchkin differential – 2. Indirect setting
(Vision System Only) – 3. Celsius to Farenheit measurement. Simply press in the
S3/Program key
to get to next value, the Munchkin differential setting will appear in the display ch and alternating
value of 30. This allows the installer to adjust the activation of the burner based on the differential
temperature setting of the Munchkin. The burner will not start until the outlet water temperature
reaches a temperature that is equal to the temperature setting for the Munchkin, minus the differ-
ential EX: The Munchkin is set to heat at 180° F degrees and the differential is set at 20° F. The burn-
er will not start until the outlet temperature of the system falls below 159° F degrees (180° – 20° F =
160° F). To adjust, press either
S1/– (Decrease Value) or S2/+ (Increase Value) Ranges 5° F to 30°
F. Press the S3/Program key again and you will see the Indirect Setting de and an alternative value
of 119 (Vision Systems Only) To adjust, press either S1/– (Decrease Value) or S2/+ (Increase Value).
The final adjustment in this mode is the Farenheit to Celcius measurement. Press the S3/Program
key again and you will see t and alternating value of F. To change value press the S1/– or S2/+ to
choose the correct measurement.
F. STATUS MENU
Installers are also able to check the current status of the Munchkin parameters by pressing S4/RESET
key for 3 seconds. Once activated, the display will show d1 alternating value of the actual outlet tem-
perature. Actual values are displayed for each function. To view the next value simply press the S/4
key to go to the next displayed value. Listed below are the values which can be displayed. These val-
ues cannot be changed. To exit this menu, simply press
S3/Program key to resume normal operation.
Function Value
d1/ Actual Temperature from outlet sensor
d2/ Actual Temperature from inlet sensor
d3/ If using a standard mechanical control, the control will display 1 for closed 0 for open
If the sensor is connected to the SuperStor Indirect Fired Water Heater it will measure
the actual temperature. (Vision only.)
d4/ Not used
d5/ Actual Temperature from the outdoor sensor. (Vision only.)
d6/ Actual Fan speed multiplied by 10 (Example: If fan speed displayed is
410 RPM x 10 = 4100 actual fan speed)
d7/ Actual Ionization current read from Flame Rectification probe
d8/ Actual Status of the Central Heating Circulator Off = 0 , On = 1 . (Vision only.)
d9/ Actual Status of the Indirect Fired Circulator Off = 0 , On = 1 . (Vision only.)
d10/ Actual Status bus communication co = connected, no = not connected
d11/ Central Heating Set Point
START-UP PROCEDURES