21
Rev. 05/2020
Filling the HEATMOR™ Outdoor Furnace Initially with Water
Before filling your HEATMOR™ furnace with water, make sure the water you intend to use
has been tested and approved. The unit comes prefilled with concentrated DOWFROST™
HD corrosion inhibited propylene glycol. DOWFROST™ HD MUST BE DILUTED WITH
APPROVED WATER. Heatmor highly recommends the use of Pure Water, such as:
Reverse Osmosis, Deionized, or Distilled.
*APPROVED WATER MUST MEET THE REQUIREMENTS OF:
PH LEVEL OF 7.0 TO 11.5
CHLORIDE LEVEL OF UNDER 50
CONDUCTIVITY LESS THAN 10,000
SOFTENED AND FILTERED TO LIMIT THE AMOUNT OF SOLIDS.
All plumbing connections at the back of the HEATMOR™ furnace, all electrical hookups,
and all heating appliances should be installed and tested for possible leaks. HEATMOR™
suggests the use of brass fittings when installing the unit.
When filling or adding fluid to your HEATMOR™ always be sure to maintain a minimum of
30% DOWFROST™ HD (corrosion inhibited-propylene glycol) in with your approved water.
If you have any questions regarding installation of the furnace or any aspect of installation,
contact your local dealer.
Never start a fire inside the firebox until the water
jacket is full of HTF, and sand has been added to the
base to the correct level.
1) Close the bladder ball valve located at the front of the
HEATMOR™ furnace. This valve will ensure no air can enter
the bladder.
2) Close the bottom supply line valve at the back of the
HEATMOR™.
3) Open the top return line valve at the back of the
HEATMOR™.
4) Connect the water source to the fill/drain valve located on
the supply fitting and open it
5) Turn on the source of water.
6) The pressured water will now flow through and remove the
air out of the lines and exchangers as the water flows into
the HEATMOR™.
7) Continue adding water until water is level with the relief vent
pipe. Be careful to minimize overflow.
8) Turn off the source of water.
The HEATMOR™ is now full of water and at least 40% DOWFROST™ HD making it
Heat Transfer Fluid (HTF).
9) Close the drain/fill valve and replace the safety cap.
10) Open the supply valve.
11) Open the bladder valve.
NOTE
: The circulator pumps cannot “push” much air through a system. They are designed
to move Heat Transfer Fluid (HTF) not air.
12) Start the circulating pump. Remember to properly bleed air from the pump.
Rear of Furnace
