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Quest Oil Fired CHH-980 Installation, Operation and Maintenance Instructions
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4.3 Filling the Fluid System
• The CHH-980, all hose and all accessories are shipped pre-charged with the “approved blend” of heat
transfer fluid (HTF). The required fluid is a 50% blend of Inhibited, propylene glycol and de-mineralized
neutral PH (#7) water. (Freeze protection to -29ºF). The HTF provided with a new system and accessories
is marketed as DowFrost. Use of any other product that cannot be proven to be equal in all respects will
void warranty of the system.
• Check the HTF level gauge (Fig. 35). The reservoir should be ⅛ to ¼ full when the system is cold. Add
approved fluid, if necessary, at the vented filler cap (Fig. 36), or use the pumping system to draw HTF
from a pail or barrel. If you prefer this method, place the free open end of the ½” suction hose into a
pail or barrel of HTF and position the valves as shown in (Fig. 38). Turn the “Primary Pump Switch” ON
(Fig. 15). Once the HTF rises to the desired level, turn the pump OFF and set the valve arrangement for
normal operating mode (Fig. 40 or 41 below).
38: Filling Tank from Pail or Barrel.