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Step 9 — Low Voltage Wiring

THERMOSTAT CONNECTIONS — The thermostat should

be wired directly to the Aquazone™ control board. See

Fig. 19, 20, and 22.

WATER FREEZE PROTECTION — The Aquazone control

allows the field selection of source fluid freeze protection

points through jumpers. The factory setting of jumper JW3

(FP1) is set for water at 30 F. In earth loop applications, jumper

JW3 should be clipped to change the setting to 13 F when

using antifreeze in colder earth loop applications. See Fig. 24.

AIR COIL FREEZE PROTECTION — The air coil freeze

protection jumper JW2 (FP2) is factory set for 30 F and should

not need adjusting.

ACCESSORY CONNECTIONS — Terminal A on the control

is provided to control accessory devices such as water valves,

electronic air cleaners, humidifiers, etc. This signal operates

with the compressor terminal. See Fig. 25. Refer to the specific

unit wiring schematic for details.

NOTE: The A terminal should only be used with 24 volt

signals — not line voltage signals.

WATER SOLENOID VALVES — Water solenoid valves may

be used on primary secondary pump and ground water installa-

tions. A typical well water control valve wiring, which can

limit waste water in a lockout condition is shown in Fig. 25. A

slow closing valve may be required to prevent water hammer.

When using a slow closing valve, consider special wiring con-

ditions. The valve takes approximately 60 seconds to open

(very little water will flow before 45 seconds) and it activates

the compressor only after the valve is completely opened by

closing its end switch. When wired as shown, the valve will

have the following operating characteristics:

1. Remain open during a lockout

2. Draw approximately 25 to 35 VA through the “Y” signal

of the thermostat.

PRE-START-UP

System Checkout —

When the installation is complete,

follow the System Checkout procedure outlined below before

starting up the system. Be sure:

1. Voltage is within the utilization range specifications of the

unit compressor and fan motor and voltage is balanced

for 3 phase units.

2. Fuses, breakers and wire are correct size.

3. Low voltage wiring is complete.

4. Piping and system flushing is complete.

5. Air is purged from closed loop system.

6. System is balanced as required. Monitor if necessary.

7. Isolation valves are open.

8. Water control valves or loop pumps are wired.

9. Condensate line is open and correctly pitched.

10. Transformer switched to lower voltage tap if necessary.

11. Blower rotates freely — shipping support is removed.

12. Blower speed is on correct setting.

13. Air filter is clean and in position.

14. Service/access panels are in place.

15. Return air temperature is between 40 to 80 F heating and

50 to 110 F cooling.

16. Air coil is clean.

17. Control field selected settings are correct.

IMPORTANT: Connecting a water solenoid valve can

overheat the anticipators of electromechanical thermo-

stats. Only use relay based electronic thermostats.

NOTE: Low voltage connector may be removed for easy installation.

Fig. 23 — Low Voltage Field Wiring

Typical

Water

Valve

24 VAC

Terminal Strip P2

AQUAZONE CONTROL (C Control Shown)

Fig. 24 — Typical Aquazone Control Board

Jumper Locations

Fig. 25 — Typical D Control Accessory Wiring

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 43 44

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