Carrier Aquazone 50HQP 072, Installation, Start-Up And Service Instructions Manual

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Step 9 — Wire Control Connections
COMPLETE C, AND DELUXE D CONTROL
All control wiring is connected to a terminal block located in the
unit electrical box. Refer to the unit wiring diagrams in Fig. 18-27
for connection details.
Units with the Complete C or Deluxe D control package can be
controlled using the included thermostat inputs (R, O, Y1, Y2, C,
G) for two stage heat pump thermostat or field-installed DDC (Di -
rect Digital Controls) controls. Note that the reversing valve on the
unit is energized when the unit is in the cooling mode. See Fig. 29
for typical thermostat connections.
Fig. 29 — Typical Thermostat Connections
THERMOSTAT AND DDC SENSORS
Thermostats or DDC space sensors should be located on an interi-
or wall away from supply ducts. Avoid locations subject to direct
sunlight or drafts, or external walls. Thermostat wiring should be
18 AWG (American Wire Gage). Refer to the installation instruc -
tions for the thermostat for further details.
HOT GAS REHEAT CONTROL
Units with hot gas reheat (HGRH) will include an additional H
terminal on the input terminal board for dehumidification control.
To enable a call for dehumidification, a 24V signal must be sent to
the H terminal with no voltage applied to the Y1, Y2, or O termi -
nals. Any call for cooling (Y1 and O) will override the dehumidi -
fication call.
AUXILIARY RELAY (DELUXE D ONLY)
All units with Deluxe D control include an auxiliary relay that can
be field wired to enable a field provided loop pump or solenoid
valve when there is a call for compressor operation.
ENERGY MANAGEMENT SWITCH (DELUXE D ONLY)
All units with Deluxe D control include an energy management
switch (EMS) relay that can be field wired to disable unit opera -
tion when a 24V signal is removed from the relay. Removing the
24V signal causes the relay to open, which cuts 24V power to the
unit control circuit. All unit components will be disabled at when
the EMS is deactivated. See Fig. 19.
BOILERLESS HEAT CONTROL (DELUXE D ONLY)
All units with Deluxe D control include a boilerless heat relay that
can be field wired to enable an external heat source when the wa -
ter loop temperature drops below the boilerless heat control set
point.
ALARM OUTPUT (ALL UNITS)
If the unit is being connected to a thermostat or DDC control with
an alarm indicator, this connection is made at the unit malfunction
output on the Unit Protection Module (UPM). See the Unit Protec -
tion Module heading in the Set Up Unit Controls section for fur -
ther details.
WSHP OPEN CONTROL
WSHP Open is a factory installed DDC control that requires the
use of Carrier ZS or WS sensors or the Carrier Equipment Touch
or System Touch for space temperature sensing. WSHP Open is
not compatible with thermostats or third party temperature sen -
sors. All WSHP Open wiring is completed at the WSHP Open
control board. For further instructions on WSHP Open, please vis -
it HVACPartners.com or Carrier.com for the WSHP Open V4
Integration Guide and Points/Properties Guide.
CONTROL TRANSFORMER
Units with Complete C but without HGRH or waterside econo
-
mizer include a 75VA transformer. Units with Deluxe D, WSHP
Open, HGRH, or waterside economizer include a 100VA trans -
former. Consider the VA draw of any accessories that will be pow -
ered by the unit control transformer.
Step 10 — Configure Unit Control Components
UNIT PROTECTION MODULE (UPM)
All units are factory provided with a unit protection module
(UPM) controls the compressor and has built safeties. See Fig. 30.
IMPORTANT: Exceptionally long runs of thermostat wire
should be avoided to prevent voltage drops in the control
circuit.
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