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

Step 9 — Wire Field Controls
THERMOSTAT CONNECTIONS — The thermostat should
be wired directly to the ECM control board. See Fig. 27.
WATER FREEZE PROTECTION — The Aquazone™ con-
trol 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 us-
ing antifreeze in colder earth loop applications. See Fig. 28.
NOTE: The extended range option should be selected
with water temperatures below 60 F to prevent internal
condensation.
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. 29. 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.
COMPRESSOR CONTACTOR
TRANSFORMER
a50-8197
A50-7764
AQUAZONE CONTROL (Complete C Shown)
Fig. 28 — Typical Aquazone™ Control Board
Jumper Locations
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 29 shows typical wiring for a 24-vac external
solenoid valve. Figures 30 and 31 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
(only on valves with end switches). Only relay or triac based
electronic 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
IMPORTANT: Connecting a water solenoid valve can
overheat the anticipators of electromechanical thermo-
stats. Only use relay based electronic thermostats.
CAPACITOR
COMPLETE C CONTROL
THERMOSTAT CONNECTION
Fig. 27 — Low Voltage Field Wiring
27
the "Y" signal of the thermostat.
TERMINAL STRIP P2
C
24 VAC
A
Fig. 29 — Typical Accessory Wiring
external solenoid
A50-6269
TYPICAL
WATER
VALVE