Boilerless Heat Control (Deluxe D Only); Alarm Output (All Units); Wshp Open Control; Control Transformer - Carrier Aquazone 50PTH024 Installation, Start-Up And Service Instructions Manual

programmed with a 30 second delay when losing the control sig-
nal, to prevent nuisance shut downs.

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
water 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 section in Step 10 — Configure Unit Control Com-
ponents section for further 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 tempera-
ture sensors.
All WSHP Open wiring is completed at the WSHP Open control
board. See Fig. 27 for details. For further instructions on WSHP
Open, please visit HVACPartners.com or Carrier.com for the
WSHP Open V4 Integration Guide and Points/Properties Guide.
CAUTION
Exceeding the transformer capacity can result in low control
voltage, erratic unit operation or damage to the heat pump.

CONTROL TRANSFORMER

All units include a 75VA transformer. VA capacity of the trans-
former should be considered when applying low voltage accesso-
ries, such as shut off valves, thermostats, or DDC controls. Table 7
shows the VA draw of factory-mounted components in the low
voltage heat pump. The total VA draw of the heat pump internal
components plus any attached accessories must be lower than the
VA capacity of the unit control transformer.
Step 10 — Configure Unit Control Components
IMPORTANT: cfm LED is an approximation. Utilize con-
ventional test and balance equipment for accurate airflow
measurement.
WARNING
To avoid possible injury or death due to electrical shock, open
the power supply disconnect switch and secure it in an open
position during installation.

UNIT PROTECTION MODULE (UPM)

All units with Complete C, Deluxe D, or WSHP Open are factory
provided with a unit protection module (UPM) controls the com-
pressor and has built safeties. (See Fig. 31.)
Freeze Sensor
The default setting for the freeze limit trip is 30°F for applications
without anti-freeze. This can be changed to 15°F for applications
with anti-freeze by cutting the R30 resistor located on top of the
DIP switch SW1.
If unit is employing a fresh water system (no anti-freeze pro-
tection), it is extremely important to have the Freeze1 R30
resistor set to 30°F in order to shut down the unit at the appro-
priate leaving-water temperature and protect your heat pump
from freezing if a freeze sensor is included.
1
2
3
4
5
17
7
1 Board Power Indicator
2 UPM Status LED Indicator
3 Water Coil Freeze Protection Temperature Selection [R30]
4 Air Coil Freeze Protection Temperature Selection
5 UPM Settings
6 Water Coil Freeze Connection
7 Air Coil Freeze Connection
8 LED Status-Diagnostic Connection
9 24VAC Power Input
10 Compressor Contact Output
11 High Pressure Switch Connection
12 Call for Compressor Y1
13 Low Pressure Switch Connection
14 24VAC Power Common
15 Condensate Overflow Sensor
16 Dry Contact
17 UPM Ground Standoff
Fig. 31 — Unit Protection Module (UPM)
34
CAUTION
11
13 12
15
9 10