Instruction manual
1. Install control board assembly into slots on blower deck. (See Fig. 1.)
2. Insert screw through mounting bracket into lip of fan coil and tighten.
PROCEDURE 4—ELECTRICAL CONNECTIONS
Refer to unit instructions for recommended wiring procedures. Install wiring in accordance with all applicable local and national codes. See Table
3 for recommended wire and fuse sizes. Harness contains both 24-v control, and high-voltage wiring.
1. Connect heater harness plug to receptacle on PCB. (See Fig. 2.) A secure connection MUST be made between plug and receptacle. Plug
will interlock with receptacle when properly seated.
2. Connect yellow common fan lead to PCB fan terminal F1.
3. Connect desired cooling speed to PCB terminal HI.
4. Connect lower speed desired for reduced heat pump speed to terminal LO. (See Tables 2, 4, and 5.)
5. Connect unused fan speed tap to dummy terminal F2.
6. For 24-v control system connections to unit PCB:
Refer to unit wiring instructions and diagrams for recommended wiring procedures. (See Fig. 3, 4, 5, 6, 7 and 8.) Use 18-gage thermostat
wire for low-voltage control field wiring. When over 100 ft, increase wire gage.
NOTE: PCB staging is automatic and controls its own algorithm. However, if local codes require using an outdoor thermostat (see applicable
outdoor unit Installation Instructions), cut jumper wire JW1 on PCB. (See Fig. 2.) All heaters are limited to 2 levels of heat with jumper JW1 cut.
(See Table 6 for capacity.)
CAUTION: Miswiring of transformer to printed circuit board will destroy both transformer and printed circuit board.
7. High-voltage supply connections to heater:
Unit wiring label is for 230-v operation. On transformers without primary leads, use the yellow and black pigtails provided with kit. Connect
yellow lead between transformer "C" and PCB "T1". Connect black lead between transformer 230 or 208 and PCB "T3". On transformers
with primary leads, connect primary transformer black lead to T1, blue lead to T2, and red lead to T3. When using 208v, connect red primary
lead to T2 and blue lead to T3.
8. Connect secondary transformer wires to PCB terminals SEC1 and SEC2. (See Fig. 2.)
NOTE: Heater supply circuit wire size and overcurrent protection must comply with National Electric Code (NEC) and Underwriters Laboratories
(UL) "Branch Circuit" requirements. (See Tables 3, 4, and 5.) Wires and overcurrent protection, integral to the heater, are not required to meet
branch circuit requirements. Internal circuit protection of 60 amps maximum is acceptable.
Fig. 2—Printed-Circuit Board (PCB)
A94127
ST1
®
®
HSCI
COMMON
DUMMY
DUMMY
240 VAC
240
VAC
JW4
JW2
JW3
JW5
JW6
JW8
JW1
R15
R27
R4
R41
1
R40
R19
R10
C9
C8
R18
R11
C7
K2
K3
LO
HI
T3
T2
T1
F1
XFORM
AUX+
AUX–
F2
FAN
R13
C10
C12
C13
FS1
R20
R9
R8
R7
R6
Z4
C5
1
MOV1
C2
C3
C6
R23
R1
R30
D5
R
C
Y
G
O
W2D
W 3
Y o
W 2T
R3
Z5
R21
JW7
R2
Z3
Z2
R16
R12
C11
R17
R5
R29
R26
R14
K1
D1
C
BE
C
BE
C
BE
D4
D2
U2
U1
LED1
D3
Q1
P1
LR40061
CLIP JUMPER FOR
HIGH SPEED FAN ONLY
Q2
123
456
789
Q3
R38
R22
R28
R25
R24
CESS430121-01A
R36
R37
C15
Z1
C14
R39
C4
CES0130025 –
SEC1
SEC2
CEPL130121-01
JW1
JW2
RECEPTACLE
LOW VOLTAGE
TERMINAL
BOARD
(CUT WHEN
OUTDOOR
THERMOSTAT
IS USED)
(HIGH FAN
ONLY WHEN
CUT)
—3—