Operator`s manual

PUREHEAT™ HYDRONIC AIR HEATER OPERATOR’S MANUAL – SECTION 4

4-1

MAINTENANCE

The Pureheat™ Hydronic Air Heater must be operated only with Ground Heaters Heat Transfer Fluid

(HTF)

The standard Pureheat™ contains 145 US gallons (535 liters) of HTF for normal operation. Ground

Heaters, Inc. recommends that the HTF be replaced every three years to ensure that the corrosion

inhibitors are sufficiently active to protect the system components.

4.1 ADDING HEAT TRANSFER FLUID

(Refer to Appendix B-10)

NOTE: Shut down all pumps (including optional Booster Pump). (If using optional Booster Pump, refer

to Section 2.3.7, Optional Booster Pump.)

4.1.1 To Clear a “LOW LEVEL FAULT”

1. Place an open container of HTF close to the

manifold area to facilitate filling. The container

must be close enough to allow the 16 ft (4.9 m) fill

hose to reach the bottom of the container.

2. Power up the Pureheat™ as directed in Section

2.4, START UP.

3. Ensure that the PUMP and BURNER Switches

are OFF.

4. Ensure that a least one section of circulation hose

is connected to the supply and return manifolds to

complete a circulation loop.

5. Verify that valve #3 is shut.

6. Verify that valves #2 and #5 are open.

7. Pull out the fill hose (attached to valve #4). Clean the exterior and remove the fill hose dust cap.

8. Remove the locking pin from fill valve #4.

9. Direct the open end of the fill hose into the opening of the HTF container.

10. Momentarily open fill valve #4 until HTF is observed running out of the fill hose. This will “prime” the

fill hose.

11. Quickly close fill valve #4 to avoid over filling the HTF container.

12. Cover the open end of the fill hose to retain HTF after priming.

NOTE: If the HTF container height is such that it will not allow gravity flow from the Pureheat™ fill hose,

use a separate container with an opening low enough to facilitate priming the fill hose using the

method described.

13. Insert the fill hose into the HTF container, ensuring that the hose is not sealed against any interior

surface of the container.

14. Open fill valve #4. Immediately lift and hold the HTF FILL Switch to begin filling. (Photo 4-1)

15. Continue filling using the HTF FILL Switch until fluid is observed in the bottom of the sight gauge.

16. The LOW LEVEL RESET button may now be pressed to clear the low level shutdown condition. It is

not necessary to stop the filling process during this step. (Refer to Appendix B-10)