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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 Replaces
47D43-111
47D43-111
47D43-111 02
47D43-101
47-102685-04
47-102685-84
47-102685-05
47-102685-02
47-21517-22
47-21517-92
47-102684-02
47-102684-04
47-102684-07
47-102684-08
DDL-122131-2RH
DDL-122131-2RH
47D43-811
Deluxe Defrost Control
INSTALLATION INSTRUCTIONS
47D43-811
PRECAUTIONS
CAUTION
!
• This control is intended only for Rheem heat pump
systems.
• Replace 47D43-811 control as a unit - no user
serviceable parts.
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.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes
and ordinances.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could
cause the control to malfunction.
CONTENTS
Description ................................................................ 1
Precautions ............................................................... 1
Specifications ............................................................ 2
Operation ................................................................... 2
Installation ................................................................. 3
WARNING
!
• To prevent electrical shock and/or equipment damage,
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.
• This control is not intended for use in locations where
it may come in direct contact with water. Suitable
protections must be provided to shield the control from
exposure to water (dripping, spraying, rain, etc.)
• Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper or loss of
heat pump operation and/or shock hazard.
• Following installation or replacement, follow appliance
manufacturer’s recommended installation/service
instructions to insure proper operation.
• Do not use on circuits exceeding specied voltage.
Higher voltage will damage control and could cause
shock or re hazard.
www.white-rodgers.com
www.emersonclimate.com
PART NO. 37-7199A
1047
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SPECIFICATIONS
Electrical Ratings [@ 77oF (25oC)]:
Rated Voltage ........................ 24 VAC
Rated Voltage Range .................. 18-30 VAC
Max. Power Consumption @ 24 VAC ..... 4.08 VA
Nominal Frequency.................... 50/60 Hz
Relay Load Ratings:
Compressor Contactor Relay ...... 0 VA in rush, 6 VA holding
Fan Relay ...................... 1/2 HP @ 240, 1/4 HP
@ 120 VAC
Reversing Valve Relay (RV) ........ 24 VA
Auxiliary Heat Relay (D)........... 1 Amp. 0.6 P.F.
Operating Temperature Range ........... -40o to 150o F (-40o to 65o C)
Humidity Range ...................... 5% to 95% relative humidity
(non-condensing)
High Pressure Cutout Switch (HPC)....... 18 VAC
Low Pressure Cutout Switch (LPC) ....... 18 VAC
OPERATION
Each controller has 24 VAC input and B, Y, and D terminals
for connection to a standard thermostat. The controller has
pins for connection of two temperature sensors to measure
ambient and coil temperature, as well as connections for
high- and low-pressure switch monitoring. Controlled outputs
are outdoor fan, reversing valve, and compressor contactor.
The 47D43 provides two LEDs for status and fault indication.
Option Switch
Switch labeled SW1 is used to select the defrost mode
termination temperature of outdoor coil. Defrost mode is
terminated when the coil temperature exceeds the selected
termination temperature. Temperature options for SW1 switch
settings are:
B A
On Off 50o F
B A
Off On 60o F
B A
On On 70o F (default)
B A
Off Off 80o F
B A
Test Pins
The pins labeled TEST can be used to change operation
mode in the field. Momentarily short the test pins to force the
system into the defrost mode. Momentarily short the test pins
again to terminate the defrost mode. To avoid unnecessary
system mode transition, do not use the test pins frequently.
Diagnostic Features
The control continuously monitors system operation. If a fault
occurs, the two LEDs on the control will indicate a diagnostic
code, if more than one fault occurs, only the code with the
higher priority will be shown.
The table shows the diagnostic codes.
LED #1 LED #2
Off Off No power 0
On On Coil sensor failure 4
Off On
Flash* Flash* Normal 1
Off Flash*
Flash* Off
On Flash*
Flash* On
On Off Defrost mode 1
Alternating Flash 5-minute delay 2
Timing Specications @ 60Hz*
Nom Units
Defrost Lockout Time 34 Mins.
Maximum Defrost Time 14 Mins.
Transient Delay (Normal) 2 Mins.
Back to Back Transient
Delay 4 Mins.
Maximum Frosting Time 6 Hrs.
Short Cycle Lockout Time 5 Mins.
Noise Abatement Time
(Normal 30 Sec.
Noise Abatement Time
(Forced Defrost) 5 Sec.
*50Hz Timings are 20% longer.
Fault
Indication
Ambient sensor
failure 3
Low pressure
lockout 7
High pressure
lockout 8
Low pressure
switch open 5
High pressure
switch open 6
Display
Priority
* The flash time is to be 0.5 seconds on and 0.5 seconds off
followed by 2 seconds off.
2
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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.
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.
Six metal standoffs, 0.375 inch long, are used to support and
mount the control into the unit.
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 Type System Component Connection
C 0.25” QC Reversing valve common
RV 0.25” QC Reversing valve output
HPC (2) 0.25” QC High pressure cutout switch
LPC (2) 0.18” QC Compressor call output
CC 0.25” QC Compressor contactor coil
Fan (2) 0.25” QC Outdoor fan control
C 0.25” QC Common, 24 VAC return
R 0.25” QC 24 VAC input
D 0.25” QC Defrost output
Y 0.25” QC Compressor call input
OAT 2-pin connector Outdoor ambient temperature sensor
OCT 2-pin connector Outdoor coil temperature sensor
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.
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.
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.
Following installation or replacement, follow appliance
manufacturer’s recommended installation or service
instructions to insure proper operation.
COMPRESSOR
CONTACTOR
COMPRESSOR
CC
REVERSING
VALVE
C
S
R
C
L1
L2
D
K2
Yout
CC
K3
RV
RV
K2
C
HERM FAN
TO THERMOSTAT
Y
C
LPC
To µP
LOW
PRESSURE
CUT-OUT
RUN CAPACITOR
R
B
K1
HPC
HIGH
PRESSURE
CUT-OUT
Fig 1. Typical System Wiring Diagram
3
To µP
R
OUTDOOR
S
FAN MOTOR
C
FAN
FAN
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White-Rodgers is a division
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
www.white-rodgers.com
www.emersonclimate.com
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