Low Voltage Wiring - Carrier Aquazone 50RHE 006 Installation, Operation And Maintenance Instructions

3.9 - Low voltage wiring (see Fig. 15)
3.9.1 - Thermostat connections
The thermostat should be wired directly to the Aquazone control
board (see Figs. 9-12).
3.9.2 - 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 appli-
cations, jumper JW3 should be clipped to change the setting to
-10.6°C when using anti-freeze in colder earth loop applications
(see Fig. 16).
3.9.3 - Air coil freeze protection
The air coil freeze protection jumper JW2 (FP2) is factory-set
for -1.1°C and should not need adjusting.
3.9.4 - 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. 17).
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.
3.9.5 - Water solenoid valves
Water solenoid valves may be used on primary/secondary pump
and ground water installations. A typical well water control valve
wiring approach, which can limit waste water in a lockout con-
dition, is shown in Fig. 17. A slow-closing valve may be required
to prevent water hammer. When using a slow-closing valve,
consider special wiring conditions. 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.
IMPORTANT: Connecting a water solenoid valve can overheat
the anticipators of electromechanical thermostats. Only use
relay based electronic thermostats.
Fig. 15 - Low voltage field wiring
Contactor CC
Transformer
Note: Low voltage connector may be removed for easy installation.
Fig. 16 - Typical Aquazone control board jumper
locations
BR BRG
C
Test
Clip JW3
for freeze R
JW3
protect JW2
Y
Y
W
O
G
R
C
AL1
JW1-AL2 DRY
AL2
A
P1
Alarm
Clip for dry
Alarm
Relay
relay
contact
Aquazone control (C control shown)
Fig. 17 - Typical D control accessory wiring
Terminal Strip P2
Terminal strip P2
C
A
Capacitor
Circuit breaker
Ground
Aquazone
'C' control
See note.
Low voltage
connector
Clip JW2-FPZ
CCG CC
Comp.
Comp jumper for anti-
Relay
Off On
relay
freeze systems
P2
1
HP
HP
FP1 Low Temp
LP
FP2 Low Temp
LP
FP1
FP1
FP2
FP2
RV
Micro
Micro
RV
CO
12 CO
Status
P3
LED
1
24Vdc
EH1
4 EH2
CO
Typical
24 V a.c.
Water
24 VAC Typical water valve
Valve
17