34
Rev. 05/2020
35
Rev. 05/2020
Removal and Replacement of the Bladder
1) Turn off the bladder ball valve located at the front of the HEATMOR™ furnace.
2) Remove the bladder cover plate held in place by two wing nuts.
3) Remove the HTF level gauge and pull the rope through the eyelet.
4) Remove the hose clamp from the bladder ball valve.
5) Pull the bladder hose away from the bladder ball valve and let the HTF drain from the
bladder.
Be careful, it could be warm.
6) Remove the old bladder and install the new bladder.
7) Install the new bladder with the valve stem in the front of the
bladder compartment with the hose coming down through
the center of the tube. Connect the tube to the bladder
valve’s 1/2 inch barbed fitting and tighten hose clamp.
8) Thread the rope over the bladder and through the eyelet.
Attach the “add HTF” plate onto the rope.
9) Open the bladder ball valve and refer to “Filling the
HEATMOR™ Outdoor Furnace Initially with Water”
Bladder Ball Valve and Bladder Hose
Principle of the Bladder Ball Valve and Bladder Hose
The bladder ball valve provides HTF flow control in maintaining
the bladder and filling the furnace with HTF. The bladder hose
provides a means for the HTF to freely flow from the water jacket to the bladder allowing
expansion and contraction.
WHEN THE HEATMOR™ FURNACE IS OPERATING, THE BLADDER BALL VALVE
MUST BE OPEN.
Maintenance / Result
To maintain the bladder ball valve, open and close the valve periodically to prevent it from
seizing. Ensure that the hose clamp is tightly fastened, securing the bladder hose to the
bladder and to the bladder ball valve.
Removal and Replacement Of Bladder Ball Valve
1) Turn off the power to the furnace.
2) Drain the HTF to below the bladder valve spud to prevent HTF from draining while
you are replacing the valve.
3) Loosen the hose clamp holding the bladder hose to the bladder ball valve.
4) Remove the bladder hose from the bladder ball valve and let the HTF drain from the
bladder.
5) Remove the old bladder ball valve and install the new bladder ball valve.
6) Attach the bladder hose to the bladder ball valve and tighten the hose clamp.
7) Keeping the bladder ball valve closed, add HTF until furnace is full.
8) Open the bladder ball valve and refer to “Filling the
HEATMOR™ Outdoor Furnace Initially with Water”
9) Turn on the power to the furnace
ABSOLUTELY NO FIRE IN THE FIREBOX WHEN PERFORMING THIS PROCESS.
DO NOT PERFORM THIS PROCESS WHEN UNIT HTF TEMPERATURE
IS UNSAFE. ALWAYS WEAR PROPER PERSONAL PROTECTIVE
EQUIPMENT WHEN WORKING WITH HTF AND CHEMICALS.
Bladder Ball Valve
Heat Transfer Fluid (HTF) Level Gauge
Principle of the HTF Level Gauge
The HTF level gauge simply gives you an accurate reading of when the bladder is full or
empty of HTF.
Maintenance / Result
To maintain your HTF level gauge, ensure that it can move freely through the eyelet. If it
does not move freely, the risk of the rope wearing and breaking or inaccurate readings are
possible.
Removal and Replacement
1) Drain some of the HTF from the furnace to allow you to
maneuver around the bladder.
2) Remove the HTF level gauge from the rope.
3) Remove the rope and replace it with a new HTF level
gauge rope.
4) Thread the rope over the bladder and through the eyelet
5) Attach the HTF level gauge.
6) Refill the bladder refer to “
Filling the HEATMOR™
Outdoor Furnace Initially with Water”
Bladder Cover Plate
Principle of the Bladder Cover Plate
The bladder cover plate simply gives protection to the bladder from possible back flashes
and excess heat. It helps hold up the bladder in position, and when it is removed allows a
large space to service the bladder.
Removal and Replacement
To remove and replace the bladder cover plate,
loosen the wing nuts and install the new cover
plate. Tighten the wing nuts.
Add Fluid Sign
Bladder Cover Plate