REPAIR PART INSTALLATION MANUAL
HEAT PUMP COMMUNICATING CONTROL REPAIR KIT (S1-33102957000)
MODELS YZB, YZE, YZH, HL5, HC5, HL8, HC8
FIGURE 1: Demand Defrost Control Module
3. Specify appropriate defrost curve using the jumper on the
control. See Table 1.
GENERAL INFORMATION
The YorkGuard VI Demand Defrost control as a replacement
part for prior versions of the YorkGuard control.
TABLE 1: Defrost Initiate Curves
Defrost Curve
Selection
1
2
3
4
Jumper Position
Following the detailed instructions for modifications of both
the indoor and outdoor units is critical.
YZB/HC3B/HL3B 2 & 2.5 Ton 4 & 5 Ton 3 & 3.5 Ton 1.5 Ton
YZE/HC5B/HL5B
YZE03811
2 Ton
N/A
4 & 5 Ton
N/A
3 Ton
3 Ton
N/A
N/A
NOTE: For direct replacement of YorkGuard VI, replace the
control only.
Service replacement kit consists of:
• YorkGuard “VI” Defrost Control.
4. Verify that the Y2 LOCK jumper is set. This jumper is not
applicable to a single stage compressor system.
5. Specify if the Heat Pump is installed with a fossil fuel fur-
nace using the FFUEL jumper. The jumper should be ON
for a fossil fuel furnace installation and OFF for an air han-
dler installation.
CONTROL CONFIGURATION FOR
ALL APPLICATIONS
Most jumper settings should be set to match jumpers on board
being removed.
6. Specify Switch Point jumper using the jumper on the con-
trol.
Remove control from packaging and configure the control as
follows:
7. Verify that the HOT HEAT PUMP is set appropriately.
1. Specify the desired Low Temperature Cut Out (LTCO)
using the jumper on the control.
8. Specify compressor delay using jumper on the control.
“ON” will shut-off compressor when entering and leaving
defrost.
2. Specify the desired Balance Point (BP) using the jumper on
the control.
Johnson Controls Unitary Products
035-22286-001-A-0909
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