Solar Boiler™ Installation Manual (OG-300), page 11 of 14
IN.410.06.DEC/99
Refilling Cap
Terminal Strip
IN (RED)
OUT (BLUE)
on pump
Rear view of the Solar Boiler™
vent tube
pressure relief
valve
Solar Boiler™ cover
3/8" copper
tube
3/8" copper tube
(marked with
tape)
insulation
Connect to terminal block
Solar Boiler HTF (heat transfer fluid) Draining/Refilling Instructions
Your Solar Boiler™ is precharged with HFT (heat transfer fluid) which is a mixture of Propylene Glycol USP and distilled water
(40/60 by volume). In the event that you should have to drain and/or refill the Solar Boiler™, follow these instructions to
ensure proper system operation.
Draining the HTF (heat transfer fluid)
The HTF should never be drained during system operation.
HTF should only be drained in
the morning before system start up, or at least one hour after system shut down in the evening.
This is to ensure that the HFT is not excessivily hot.
✍
❏
Remove the cover from the Solar Boiler. Turn the Solar Boiler off using the switch,
(ON = green; OFF = black), located under the cover. (Switch only available on some
models. If no switch, disconnect the wires)
❏
Disconnect the 3/8" copper lines from the Solar Boiler™. Allow any fluid from
the lines to drain into a container. Leave lines disconnected.
❏
To drain the fluid in the Solar Boiler™ module, you will have to wait until
their is enough sunlight for the system to operate. With a container under the
outlet of the pump, turn the Solar Boiler™ ON. Keep the unit on until no
liquid comes out of the pump. Turn the Solar Boiler™ OFF. Do not turn
the system on again until Solar Boiler™ is refilled.
❏
The system is now drained. Connect the 3/8" copper lines to the Solar Boiler™ unit. To refill the Solar Boiler™, follow
the instructions listed below.
Refilling the Solar Boiler™ with HTF (heat transfer fluid)
✍
❏
Remove the cover from the Solar Boiler. Turn the Solar Boiler off using the switch, (ON = green; OFF = black), located
under the cover. (Switch only available on some models. If no switch, disconnect the wires)
❏
Locate and remove the pressure relief valve attached to the vent tube at the back of the unit.
❏
Locate the fill tube at the side of the unit and remove the brass cap from the fill tube. Using the wooden dowel provided
check the fluid level in the reservoir. This level should be about 8 - 12” on the dowel while the system is operating. If the
level is low contact your dealer or Thermo Dynamics Ltd. before continuing.
❏
If the fluid level is low inspect the system for signs of leakage. Inspect all visible fittings on the Solar Boiler and the connec-
tions at the solar collector on the roof. Also inspect under the Solar Boiler case for signs of HTF on the floor. Propylene
glycol USP dries very slowly and will remain on surfaces for an extended period of time.
❏
The recommended heat transfer fluid is a 40/60 mixture by volume of Propylene Glycol USP and distilled water. Fluid
should be added to the Solar Boiler with a funnel to prevent spillage. When adding fluid, follow the step 17 on page 8.
❏
Replace the brass cap on the fill tube and hand tighten. Replace the
pressure relief valve on the vent tube at the back of the Solar Boiler.
Turn the Solar Boiler ON using the switch or by connecting the PV
wires, replace the cover on the Solar Boiler.
Back
Front
pump
motor
vent tube
