Step 9 - Wire Field Controls; Thermostat Connections; Air Coil Freeze Protection; Water Solenoid Valves - Carrier AQUAZONE 50PCH Installation And Service Instructions Manual

Step 9 — Wire Field Controls
THERMOSTAT CONNECTIONS —
should be wired directly to the Aquazone™ control board. See
Fig. 13-20, and 22.
CAPACITOR
COMPRESSOR CONTACTOR
TRANSFORMER
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NOTE: Low voltage connector may be removed for easy installation.
Fig. 22 — Low Voltage Field Wiring
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 10 F when
using antifreeze in colder earth loop applications. See Fig. 23.
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Fig. 23 — Typical Aquazone Control Board
Jumper Locations (Complete C Control Shown)
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. 24. 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.
The thermostat
COMPLETE C CONTROL
THERMOSTAT CONNECTION
TERMINAL STRIP P2
C
A
Fig. 24 — Typical Deluxe D Control
Accessory Wiring
WATER SOLENOID VALVES — An
valve(s) should be used on ground water installations to shut
off flow to the unit when the compressor is not operating. A
slow closing valve may be required to help reduce water
hammer. Figure 24 shows typical wiring for a 24-vac external
solenoid valve. Figures 25 and 26 illustrate typical slow closing
water control valve wiring for Taco 500 Series and Taco ESP
Series valves. Slow closing valves take approximately 60 sec.
to open (very little water will flow before 45 sec.). Once fully
open, an end switch allows the compressor to be energized (on-
ly on valves with end switches). Only relay or triac based elec-
tronic thermostats should be used with slow closing valves.
When wired as shown, the slow closing valve will operate
properly with the following notations:
1. The valve will remain open during a unit lockout.
2. The valve will 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 thermo-
stats. Only use relay based electronic thermostats.
1
HEATER SWITCH
THERMOSTAT
Fig. 25 — AMV Valve Wiring
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Fig. 26 — Taco SBV Valve Wiring
20
TYPICAL
WATER
24 VAC
VALVE
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external
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2
AMV
3
TACO VALVE
solenoid