Step 9 - Field Control Wiring; Thermostat Connections; Water Freeze Protection; Air Coil Freeze Protection - Carrier AQUAZONE 50HQL072-120 Installation, Start-Up And Service Instructions Manual

Step 9 — Field Control Wiring
THERMOSTAT CONNECTIONS — The thermostat should
be wired directly to the Aquazone™ control board. See
Fig. 8A-12.
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. 13.
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 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. 14. 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.
AL — Alarm Relay Contacts
AL2 — Jumper Wire for Alarm
BC — Blower Contactor
CB — Circuit Breaker
CC — Compressor Contactor
CCH — Crankcase Heater
CO — Sensor, Condensate Overflow
FP1 — Sensor, Water Coil Freeze Protection
FP2 — Sensor, Air Coil Freeze Protection
HP — High-Pressure Switch
HWTS — Hot Water Temperature Sensor
JW1 or — Jumper, Alarm Mode
JW4
JW3 — Clippable Field Selection Jumper
LOC — Loss of Charge Pressure Switch
PDB — Power Distribution Block
P1 — Field Wiring Terminal Block
RVS — Reversing Valve Solenoid
TRANS — Transformer
TXV — Thermostatic Expansion Valve
*Optional wiring.
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. 14. 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.
IMPORTANT: The use of a slow-closing water solenoid
valve can overheat the anticipators of electromechanical
thermostats. Only use relay based electronic thermostats.
LEGEND FOR FIG. 8A-11B
Factory Line Voltage Wiring
Factory Low Voltage Wiring
Field Line Voltage Wiring
Field Low Voltage Wiring
Printed Circuit Trace
Optional Wiring
Relay/Contactor Coil
Thermistor
Condensate Pan
Circuit Breaker
Ground
14
Solenoid Coil
Relay Contacts - N.O.
Relay Contacts - N.C.
Temperature Switch
Switch - Low Pressure
Switch - High Pressure
Wire Nut
Splice Cap
G LED