47D43-811
Deluxe Defrost Control
INSTALLATION INSTRUCTIONS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
The 47D43-811 is a microprocessor-based demand defrost
controller intended for Rheem heat pump systems. This
controller uses basic differential temperature means to detect
degradation of system performance due to ice build-up on the
outdoor coil. The controller uses “self-calibrating” principles
to calibrate itself to the heat pump system. The defrosting is
performed by reversing the direction of flow of refrigerant.
The 47D43-811 is meant to replace the following controllers
in Rheem heat pump systems:
47D43-811
47D43-811 Replaces
47D43-111
47D43-111
47-102685-04 47-21517-92
47-102685-84 47-102684-02 DDL-122131-2RH
DDL-122131-2RH
47D43-111 02 47-102685-05 47-102684-04
47D43-101 47-102685-02 47-102684-07
47-21517-22
47-102684-08
PRECAUTIONS
WARNING
• Topreventelectricalshockand/orequipmentdamage,
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.
!
CAUTION
• This control is intended only for Rheem heat pump
!
systems.
• Replace 47D43-811 control as a unit - no user
serviceable parts.
• Thiscontrolisnotintendedforuseinlocationswhere
it may come in direct contact with water. Suitable
protectionsmustbeprovidedtoshieldthecontrolfrom
exposure to water (dripping, spraying, rain, etc.)
If in doubt about whether your wiring is millivolt, line or low
voltage, have it inspected by a qualified heating and air
conditioning contractor or licensed electrician.
• Label all wires prior to disconnection when servicing
controls.Wiring errors can cause improper or loss of
heat pump operation and/or shock hazard.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes
and ordinances.
• Followinginstallationorreplacement,followappliance
manufacturer’s recommended installation/service
instructions to insure proper operation.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could
cause the control to malfunction.
• Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.
CONTENTS
Description ................................................................ 1
Precautions ............................................................... 1
Specifications ............................................................ 2
Operation................................................................... 2
Installation ................................................................. 3
PART NO. 37-7199A
1047
INSTALLATION
On some units, the Outdoor Ambient Temperature (OAT) and
Outdoor Coil Temperature (OCT) sensors may be attached
permanently to the controller. The 47D43-811 includes
replacement OAT and OCT sensors that plug onto the 2- and
3-pin connectors on the controller board.
NOTE
All wiring should be installed according to local and national
electrical codes and ordinances.
The 47D43-811 control may be mounted on any convenient
surface using the six standoffs provided.
Before removing the old controller, note the location of the
OCT sensor on the outdoor coil. The new sensor should
be attached to the coil in the same location, or as close as
possible. The OAT sensor is typically 24-48” long, although
some controllers have the sensor on the board. Placement of
the OAT sensor is not as critical as the OCT sensor, but both
sensors are required for the controller to operate.
The control must be secured to an area that will experience
a minimum of vibration and remain below the maximum
ambient temperature rating of 150o F. The control is approved
for minimum ambient temperatures of -40o F.
Any orientation is acceptable.
Six metal standoffs, 0.375 inch long, are used to support and
mount the control into the unit.
Refer to the wiring diagram and wiring table when connecting
the 47D43-811 control to other components of the system.
UL approved, 105o C rated 18 gauge min., stranded 2/64”
thick insulation wire is recommended for all low voltage safety
circuit connections.
UL approved, 105o C rated 16 gauge min., stranded 2/64”
thick insulation wire is recommended for all line voltage
connections.
Board size is 3.375 in. x 3.625 in. and requires 1 inch of
headroom (not including mounting).
Typical System Wiring Table
47D43
Terminal
C
Type
System Component Connection
Reversing valve common
Reversing valve output
High pressure cutout switch
Compressor call output
Compressor contactor coil
Outdoor fan control
0.25” QC
0.25” QC
0.25” QC
0.18” QC
0.25” QC
0.25” QC
0.25” QC
0.25” QC
0.25” QC
0.25” QC
Following installation or replacement, follow appliance
manufacturer’s recommended installation or service
instructions to insure proper operation.
RV
HPC (2)
LPC (2)
CC
Fan (2)
C
Common, 24 VAC return
24 VAC input
R
D
Defrost output
Y
Compressor call input
OAT
OCT
2-pin connector Outdoor ambient temperature sensor
2-pin connector Outdoor coil temperature sensor
C
R
COMPRESSOR
OUTDOOR
FAN MOTOR
HERM
FAN
S
R
S
C
C
RUN CAPACITOR
CC
COMPRESSOR
CONTACTOR
TO THERMOSTAT
L1
L2
D
Y
C
R
B
K2
FAN
FAN
Yout
CC
RV
C
K1
K3
REVERSING
VALVE
K2
RV
LPC
HPC
To µP
To µP
LOW
HIGH
PRESSURE
CUT-OUT
PRESSURE
CUT-OUT
Fig 1.Typical System Wiring Diagram
3
White-Rodgers is a division
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
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