S1-33101975102
REPLACEMENT DEMAND DEFROST CONTROL BOARD – S1-33101975102
FOR USE WITH MODELS: 12, 13 & 14 SEER HEAT PUMPS
REPAIR PART KIT INSTALLATION INSTRUCTIONS
Subject to change without notice. Printed in U.S.A. 035-21270-001-A-0906
Copyright © by York International Corp. 2006. All rights reserved. Supersedes: Nothing
Unitary 5005 Norman
Product York OK
Group Drive 73069
INSTALLATION
1. Power off unit totally - 240V & 24V.
2. Carefully record positions and colors of wiring removed.
3. Remove old defrost circuit board.
4. Install replacement circuit board - utilizing same placement,
mounting & screws.
5. Refer to unit Installation Manual or Table 1 below - and set
the Demand Defrost Curve Selection Jumper to the proper
position. For the new jumper setting to take effect - all 24V
power to the board must be removed and reapplied.
6. Complete the installation and power up the unit, re-apply-
ing both 240V & 24V.
DEFROST CURVE SELECTION
When the control board is replaced, the jumper MUST be
placed in a numbered position. Select the proper jumper posi-
tion from Table1. If the jumper is missing or in the P po si-
tion, the replacement control will not energize the
compressor.
When the jumper position is changed, the control will not act
upon the jumper changes until the thermostat calls are de-ener-
gized or power (24 VAC) to the control is cycled.
The control will display the active defrost curve using the X/L
terminal when the heat pump is operating in a defrost cycle that
has been forced using the TEST inputs. For instance, the X/L
output will be energized with two flashes when defrost curve 2
is active. The control only reads the jumper input when the Y
and W thermostat inputs are de-energized.
FIGURE 1: Outdoor Unit Control Box FIGURE 2: Demand Defrost Control Module
HEATER LIMIT SWITCH
(Not on all Units)
DUAL
RUN/FAN
CAPACITOR
GROUND
LUG
CONTACTOR
DEFROST
CONTROL
BOARD
“FINGERED”
BUSHING
LOW
VOLTAGE
BOX
REVERSIBLE HIGH
VOLTAGE CONDUIT PLATE
START
CAPACITOR
(Not on all Units)
START RELAY
(Not on all Units)
TEST
AMBIENT
AMBG
COIL G
COIL
1
2
3
4
COND
FAN
HIGH VOLTAGE
PRESSURE
M
SWITCH
REV
VALV E
X/L
R
C
Y
O
W
W1/66
X/L
R
C
Y
O
W
W1/66
DEMAND
DEFROST CURVE
SELECTION JUMPER
P
T ABLE 1: Defrost Initiate Curves
Defrost Curve Selection
Jumper Position
1234
14 Seer 2, 3, 4 Ton 2.5, 3.5 Ton None None
All Other Models All None None None
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