69
Rev. 05/2020
CHAPTER 24
FREQUENTLY ASKED QUESTIONS
Q.
How much Heat Transfer Fluid (HTF) should be in the bladder?
A.
When the furnace is initially filled, there should be about one inch of HTF in the
bladder with the HTF at a temperature of 50 degrees Fahrenheit. When the
furnace is at its operating temperature, the bladder should be at least 30% full.
Overfilling the bladder can shorten the life of the bladder.
Refer to:
• “Maintaining the correct amount of HTF in the bladder and in the HEATMOR™”
Q.
Why is HTF coming out of the overflow relief vent pipe?
A.
When the furnace is initially filled and too much HTF is in the furnace, it releases
through the relief vent pipe when the furnace is up to temperature. If this
happens, a small amount of HTF should be removed from the furnace so the
bladder is not hard.
Refer to:
• “Installation of the HEATMOR™ Furnace”
Q. Why is my furnace wet on the inside of the firebox?
A.
When your furnace is first fired up, and also at times during normal operation, the
atmosphere inside the firebox will exceed the dew point causing condensation.
Refer to:
• ”Trouble Shooting and Solutions
” Furnace has excessive moisture in firebox
• “Dew Point”
Q. Why does my furnace fail to respond to the switch at the front of the
furnace? For example; the light will not come on and the fan will not operate?
A.
The High Limit Temperature Safety Shutoff Controller has probably overridden the
operating Electronic Aquastat.If this has happened, it should also trigger your
distribution system or high HTF temperature warning.
Refer to:
• “
High Limit Temperature Safety Shutoff Controller”
Q. Why is it getting so warm in my house and I cannot reduce the temperature with
the thermostat?
A.
At this point the High Limit Temperature Safety Shutoff Controller has been tripped on.
To detect the precise reason, please contact your local dealer.
Refer to:
• “
High Limit Temperature Safety Shutoff Controller
”
Q. My furnace is shut down but still continues to increase in HTF temperature?
A.
There is an air leak somewhere in the furnace. Check all flippers and seals,ensuring
that there is an airtight seal.
Refer to:
• “Checking for Air Leaks”
