Electrical - Thermostat Wiring; Series - Heat Controller HTV Series Installation, Operation & Maintenance Manual

Installation, Operation & Maintenance

Electrical - Thermostat Wiring

CAUTION!
CAUTION! Many units are installed with a factory or eld
supplied manual or electric shut-off valve. DAMAGE
WILL OCCUR if shut-off valve is closed during unit
operation. A high pressure switch must be installed on
the heat pump side of any eld provided shut-off valves
and connected to the heat pump controls in series with
the built-in refrigerant circuit high pressure switch to
disable compressor operation if water pressure exceeds
pressure switch setting. The eld installed high pressure
switch shall have a cut-out pressure of 300 psig and a
cut-in pressure of 250 psig. This pressure switch can
be ordered from ClimateMaster with a 1/4" internal are Manufacturer
connection as part number 39B0005N02.
CAUTION!
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with ClimateMaster
equipment.
Thermostat Installation
The thermostat should be located on an interior wall in a
larger room, away from supply duct drafts. DO NOT locate
the thermostat in areas subject to sunlight, drafts or on
external walls. The wire access hole behind the thermostat
may in certain cases need to be sealed to prevent erroneous
temperature measurement. Position the thermostat back
plate against the wall so that it appears level and so the
thermostat wires protrude through the middle of the back
plate. Mark the position of the back plate mounting holes
and drill holes with a 3/16" (5mm) bit. Install supplied
anchors and secure plate to the wall. Thermostat wire must
be 18 AWG wire. Wire the appropriate thermostat as shown
in Figures 24 and 25 to the low voltage terminal strip on the
CXM (units with PSC motor) or ECM control board (units
with ECM motor). Practically any heat pump thermostat will
work with these units, provided it has the correct number of
heating and cooling stages.
NOTICE: Units with ClimaDry whole house dehumidi cation
option require a separate humidistat or thermostat part
number ATP32U04 (See ClimaDry AOM for more details).
HTV/HTD/HTH SERIES
Manufacturer
23
Figure 24: Units With Optional ECM Fan.
Connection to ECM Control
ATP32U04 Thermostat
Y1
Compressor
Y2
Compressor Stage 2
W
Auxiliary Heat
DH
Dehumidification
O
Reversing Valve
G
Fan
R
24Vac Hot
C
24Vac Common
L
Fault LED
Units with CXM or DXM board and ECM fan motor, utilizing ECM dehumidifi cation mode
Units with CXM or DXM board and ECM fan motor, utilizing ECM dehumidification
mode (without ClimaDry option)
Notes:
Notes:
1) ECM dehumidifi cation mode slows down fan speed in the cooling mode when
1) Units with whole house dehumidification option have slightly different
dehumidifi cation output from thermostat is active. Normal heating and cooling fan
thermostat wiring.Terminal DH at the thermostat is connected to terminal H at
speeds are not affected.
the DXM board
2) ECM dehumidification mode slows down fan speed in the cooling mode when
2) ECM board DIP switch SW9 must be in dehumid. mode for ECM dehumidifi cation mode.
dehumidification output from thermostat is active. Normal heating and cooling fan
speeds are not affected.
3) ECM board DIP switch SW9 must be in dehumid. mode for
ECM dehumidification mode.
Figure 25: Typical Thermostat 2 Heat/1 Cool (PSC Fan)
Connection to CXM Control
ATM21U01 Thermostat
Y
Compressor
Y2/W
Heating Stage 2
O
Reversing Valve
G
Fan
R
24Vac Hot
C
24Vac Common
L
Fault LED
Heat Controller, Inc.
ECM
Board
Y1
Y2
W
DH
O
G
R
C
AL1
CXM
Y
W
O
G
R
C
AL1