17
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
Note: Low voltage connector may be removed for easy installation.
Fig. 16 - Typical Aquazone control board jumper
locations
Aquazone control (C control shown)
Fig. 17 - Typical D control accessory wiring
Capacitor
Circuit breaker
Contactor CC
Ground
Transformer
See note.
Low voltage
connector
Aquazone
‘C’ control
Off On
Comp
Relay
FP1 Low Temp
FP2 Low Temp
JW3
JW2
Test
BR
BRG
CCG
CC
Y
C
R
Micro
Y
W
O
G
R
C
AL1
AL2
A
P1
JW1-AL2 DRY
Alarm
Relay
1
12
P2
HP
HP
LP
LP
FP1
FP1
FP2
FP2
RV
RV
CO
CO
Status
LED
CO
P3
1
4
EH1
EH2
24Vdc
Clip JW3
for freeze
protect
Clip for dry
contact
Clip JW2-FPZ
jumper for anti-
freeze systems
Alarm
relay
Comp.
relay
Micro
Typical
Water
Valve
C
A
24 VAC
Terminal Strip P2
Terminal strip P2
Typical water valve
24 V a.c.
