58
Rev. 05/2020
CHAPTER 17
ELECTRONIC AQUASTAT CONTROLLER
Principles
The Electronic Controller displays the temperature of the HTF
in the water jacket and shuts down the fan(s) when excessive
low HTF is detected.
1) At its low setting it will turn the combustion air blower(s)
on, re-igniting the fire.
2) At its high setting it will turn the combustion air blower(s)
off, extinguishing the fire.
3) The difference between the highest temperature of the
HTF and the lowest temperature of the HTF is factory
set at 15 degrees Fahrenheit.
Operation
The factory settings on this aquastat should not be changed;
changing the factory settings will void the warranty and
certifications.
Maintenance
Keep the face of the dial clean by cleaning periodically with
glass cleaner.
Removal and Replacement
1) Turn off the main power supply to the HEATMOR™.
2) Remove the screws from the panel that holds the Electronic Aquastat Controller.
3) Pull the controller and panel away from the housing to obtain clearance to work on the
Electronic Aquastat Controller on the back.
4) Disconnect and label or draw a diagram of each wife connection on the Electronic
Aquastat Controller. Refer to the Wiring diagram at the back of this manual.
5) Replace the controller and reverse the steps above for re-installation.
NOTE:
Different makes and models of furnaces may have different controllers. These
controllers will NOT be interchangeable. Replace with the correct unit from your dealer.
NOTE:
The temperature reading in your house may not coincide exactly with the
temperature of the HTF leaving the back of the HEATMOR™
These variances result from:
1) The Electronic Aquastat Controller is reading the temperature of the HTF at the top
of the water jacket, at the rear of the HEATMOR™. The hot supply HTF is taken from
the bottom of the water jacket at the rear of the HEATMOR™.
2) The high limit aquastat is reading the temperature from the top of the water jacket, at
the rear of the HEATMOR™.
3) Until the HTF is thoroughly mixed, whether or not the unit is firing, there will be
variances between the different instruments.
IN A NORMAL OPERATING MODE, VARIANCES IN READINGS AND
CALIBRATIONS WILL NOT AFFECT THE END RESULTS OF THE TOTAL SYSTEM.
Electronic Aquastat Controller
Temperature Probe
