15
Step 10 — Install Field Control Wiring
THERMOSTAT CONNECTIONS — The thermostat should
be wired directly to the Aquazone™ control board. See
Fig. 18 and 19.
The thermostat should be located on an interior wall in a
larger room, away from supply duct drafts. DO NOT locate the
thermostat in areas subject to sunlight, drafts or on external
walls. The wire access hole behind the thermostat may in cer-
tain cases need to be sealed to prevent erroneous temperature
measurement.
Position the thermostat back plate against the wall so that it
appears level and so the thermostat wires protrude through the
middle of the back plate. Mark the position of the back plate
mounting holes and drill holes with a
3
/
16
-in. bit. Install sup-
plied anchors and secure plate to the wall. Thermostat wire
must be 18 AWG (American Wire Gage) wire. Wire the appro-
priate thermostat as shown in Fig. 20 and 21 to the low voltage
terminal strip on the Complete C or Deluxe D control board.
Most heat pump thermostats will work with a Carrier unit,
provided the thermostat has the correct number of heating and
cooling stages.
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 –1.1 C. In earth loop applications,
jumper JW3 should be clipped to change the setting to –12.2 C
when using antifreeze in colder earth loop applications. See
Fig. 18.
AIR COIL FREEZE PROTECTION — The air coil freeze
protection jumper JW2 (FP2) is factory set for –1.1 C and
should not need adjusting.
ACCESSORY CONNECTIONS — Terminal labeled A on
the control is provided to control accessory devices such as
water valves, electronic air cleaners, humidifiers, etc. This sig-
nal operates with the compressor terminal. See Fig. 19. 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 variable flow systems 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. 18. A
slow closing valve may be required to prevent water hammer.
When using a slow closing valve, special wiring conditions
need to be considered. The valve takes approximately 60 sec-
onds 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.
a50-6268tf.tif
AQUAZONE CONTROL (Complete C Control Shown)
Fig. 18 — Typical Aquazone™ Control Board
Jumper Locations
IMPORTANT: The use of a slow-closing water solenoid
valve can overheat the anticipators of electromechanical
thermostats. Only use relay based electronic thermostats.
TYPICAL
WATER
VALVE
C
A
24 VAC
TERMINAL STRIP P2
Fig. 19 — Typical Aquazone Accessory Wiring
(Control D Shown)
THERMOSTAT
Compressor-Stage 1
Reversing Valve
Fan
24Vac Hot
Y1
Y2
O
G
R
Y
O
G
R
CompleteC 1
Y
O
G
R
24Vac Com
C
C
Compressor-Stage 2
C
AL
AL
AL
CompleteC 2
Fig. 20 — Thermostat Wiring to Complete C Board
THERMOSTAT
Compressor-Stage 1
Reversing Valve
Fan
24Vac Hot
Y1
Y2
O
G
R
O
G
R
Deluxe D 1
Y
O
G
R
24Vac Com
C
C
Compressor-Stage 2
C
AL1
AL1
AL
Y1
Y2
COM 2
COM 2
Deluxe D 2
Fig. 21 — Thermostat Wiring to Deluxe D Board
