38SQ
Control Box
Modification Kit
Installation Instructions
Part No. 315776-701, -702, -703, -704, and -705
NOTE: Read the entire instruction manual before starting the
installation.
INTRODUCTION
The following procedure is for field modification of the electrical
controls in the compressor section of a 38SQ triple-split heat pump
with the A, O, and R microprocessor board. The modification
consists of removing the existing control box and installing the
new control box with a standard time/temperature defrost control
board.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause personal injury or property damage.
Consult a qualified installer, service agency, or your distributor or
branch for information or assistance. The qualified installer or
agency must use factory-authorized kits or accessories when
modifying this product. Refer to the individual instructions pack-
aged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for brazing operations. Have fire extinguisher
available. Read these instructions thoroughly and follow all
warnings or cautions attached to the unit. Consult local building
codes and National Electrical Code (NEC) for special require-
ments.
Recognize safety information. This is the safety-alert symbol
.
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies hazards which
could result in personal injury or death. CAUTION is used to
identify unsafe practices which would result in minor personal
injury or product and property damage.
Before servicing or modifying system, always turn off main
power to system. There may be more than 1 disconnect
switch. Turn off accessory heater power if applicable. Elec-
trical shock can cause personal injury or death.
As with any mechanical equipment, personal injury can result
from sharp metal edges. Take care when removing parts.
MODIFICATION PROCEDURE
Step 1—Remove Factory-Installed Control Box
1. Turn off power to the compressor section and indoor air
handler.
2. At wire nuts, disconnect line power wires from wires to
secondary disconnect.
3. Remove access wrapper and top cover.
4. Disconnect crankcase heater wires and remove wires from
control box. Do not remove crankcase heater from compres-
sor.
5. Remove compressor terminal box cover and disconnect com-
pressor wires. Do not damage or disturb the fusite plug.
6. Remove thermostat wires from compressor section defrost
board in compressor section. Label wires for ease of connec-
tion to terminal board. (See Fig. 1.)
Refer to Fig. 2 to assist in completion of the following steps.
7. Disconnect defrost thermostat wires and remove from control
box.
8. Disconnect wires to reversing valve solenoid coil.
9. Disconnect wires to low-pressure switch (LPS) and remove
from control box.
10. Disconnect wires to outdoor fan motor and remove from
control box.
11. Remove control box mounting screws and remove box.
Step 2—Install Control Box Modification Kit
1. Mount modified control box using screws removed from old
control box. (See Fig. 3.)
Fig. 1—Wiring Prior to Modification
A92322
THERMOSTAT
SUBBASE
HH93AZ183 OR
HH93AZ186
38SQ
COMPRESSOR
SECTION TERMINAL
BOARDS
RRR
CCC
YGY
GG
OO
PP
EE
L
W
2
W
2
L
COOLING AND 2-STAGE HEATING
WITH ELECTRIC HEAT
BEFORE MODIFICATION
R
C
G
E
W
2
W
3
40QB, 40AQ, OR 40FQ
ELECTRIC HEATER
TERMINAL
BOARD
E
W
2
W
3
24 V
TRANS
38SQ
OUTDOOR COIL
CONTROL BOX
T
DFT
T
DFT
DFT
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 5a 5a
PC 101 Catalog No. 563-782 Printed in U.S.A. Form 38SQ-19SI Pg 1 6-94 Replaces: 38SQ-18SI
(12 pages)
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