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3. Open all air vents. Fill the system with the water. DO

NOT allow system to overflow. Bleed all air from the
system. Pressurize and check the system for leaks and re-
pair appropriately.

4. Verify all strainers are in place. Start the pumps, and sys-

tematically check each vent to ensure all air is bled from
the system.

5. Verify make-up water is available. Adjust make-up water

appropriately to replace the air which was bled from the
system. Check and adjust the water/air level in the expan-
sion tank.

6. Raise the loop temperature to approximately 85

F. Open

the drain at the lowest point in the system. Adjust the
make-up water replacement rate to equal the rate of bleed.

7. Refill the system and add trisodium phosphate in a pro-

portion of approximately one pound per 150 gallons of
water (or other equivalent approved cleaning agent).

Raise the loop temperature to 100

F. Circulate the solu-

tion for a minimum of 8 to 24 hours. At the end of this
period, shut off the circulating pump and drain the solu-
tion. Repeat system cleaning if desired.

8. When the cleaning process is complete, remove the short-

circuited hose. Reconnect the hoses to the proper supply,
and return the connections to each of the units. Refill the
system and bleed off all air.

9. Test the system pH with litmus paper. The system water

should be slightly alkaline (pH of 7.5 to 8.5). Add chemi-
cals, as appropriate, to maintain acidity levels.

10. When the system is successfully cleaned, flushed, refilled

and bled, restore power.

11. Check the main system panels, safety cutouts and alarms.

Set the controls to properly maintain loop temperatures.

Antifreeze —

In areas where entering loop temperatures

drop below 40 F or where piping will be routed through areas
subject to freezing, antifreeze is needed.

Alcohols and glycols are commonly used as antifreeze

agents. Freeze protection should be maintained to 15 F below
the lowest expected entering loop temperature. For example, if
the lowest expected entering loop temperature is 30 F, the leav-
ing loop temperature would be 22 to 25 F. Therefore, the freeze
protection should be at 15 F (30 F – 15 F = 15 F).

Calculate the total volume of fluid in the piping system. See

Table 8. Use the percentage by volume in Table 9 to determine
the amount of antifreeze to use. Antifreeze concentration
should be checked from a well mixed sample using a hydrome-
ter to measure specific gravity.
FREEZE PROTECTION SELECTION — The 30 F FP1
factory setting (water) should be used to avoid freeze damage
to the unit.

Once antifreeze is selected, the JW3 jumper (FP1) should

be clipped on the control to select the low temperature (anti-
freeze 10 F) set point to avoid nuisance faults.

Table 8 — Approximate Fluid Volume (gal.)

per 100 Ft of Pipe

LEGEND

NOTE: Volume of heat exchanger is approximately 1.0 gallon.

Table 9 — Antifreeze Percentages by Volume

Cooling Tower/Boiler Systems —

These systems

typically use a common loop maintained at 60 to 90 F. The use
of a closed circuit evaporative cooling tower with a secondary
heat exchanger between the tower and the water loop is recom-
mended. If an open type cooling tower is used continuously,
chemical treatment and filtering will be necessary.

Ground Coupled, Closed Loop and Plateframe
Heat Exchanger Well Systems —

These systems al-

low water temperatures from 30 to 110 F. The external loop
field is divided up into 2 in. polyethylene supply and return
lines. Each line has valves connected in such a way that upon
system start-up, each line can be isolated for flushing using only
the system pumps. Air separation should be located in the pip-
ing system prior to the fluid re-entering the loop field.

OPERATION

Power Up Mode —

The unit will not operate until all the

inputs, terminals and safety controls are checked for normal
operation.
NOTE: The compressor will have a 5-minute anti-short cycle
upon power up.

Units with Aquazone™ Complete C Control

STANDBY — Y and W terminals are not active in Standby
mode, however the O and G terminals may be active, depend-
ing on the application. The compressor will be off.
COOLING — Y and O terminals are active in Cooling mode.
After power up, the first call to the compressor will initiate a
5 to 80 second random start delay and a 5-minute anti-short
cycle protection time delay. After both delays are complete, the
compressor is energized.
NOTE: On all subsequent compressor calls the random start
delay is omitted.
HEATING STAGE 1 —

Terminal Y is active in heating

stage 1. After power up, the first call to the compressor will

To avoid possible damage to a plastic (PVC) piping sys-
tem, do not allow temperatures to exceed 110 F.

DO NOT use “Stop Leak” or any similar chemical agent in
this system. Addition of these chemicals to the loop water
will foul the system and inhibit unit operation.

IMPORTANT: All alcohols should be pre-mixed and
pumped from a reservoir outside of the building or
introduced under water level to prevent alcohols from
fuming.

PIPE

DIAMETER (in.)

VOLUME (gal.)

Copper

4.1

1.25

6.4

1.5

9.2

Rubber Hose

3.9

Polyethylene