it. Timing is such that sequencer number 1 will turn on before
sequencer number 2. When the signal to W3 is turned off,
sequencer number 2 opens after a short delay. If W2 is also
satisfied, the first stage of electric heat and the fan will also turn
off, providing the thermostat is not calling for the fan to be on.
E--When the thermostat sends a signal to E 2 signals are sent out
to the sequencers. A 24-v ac signal is sent to sequencer number 3
and a 24-v dc signal is sent to sequencer number 1. The 24-v ac
signal applied to sequencer number 3 turns on the third stage of
electric heat. The 24-v dc signal applied to sequencer 1 turns on the
first stage of electric heat and the fan in the same manner as W3.
Note that E is also interlocked with the fan.
When the thermostat stops calling for electric heat, the signals to
sequencers 1 and 3 are turned off and the sequencers open. This
causes the electric heat to turn off with the fan if the thermostat is
not calling for the fan.
ACCESSORIES
1. EAC1 and EAC2 for Electronic Air Cleaners
a. There are 240-v electronic air cleaner contacts provided at
EAC1 and EAC2. The electronic air cleaner is connected in
parallel with the fan so that it is on whenever the fan is on.
A 120-v installation is similar in function but connected
between EAC2 and neutral of 230-v: 120-v transformer
connected to EAC1 and EAC2. Refer to electronic air
cleaner literature for further information.
→
Fig. 5—Wiring Diagram of Relay Heater
A99121E
COMPONENT ARRANGEMENT
HTR1
HTR3
HTR2
COM
208 V
230 V
TR
A
N
RED
24 V
BRN
SYSTEM TRANSFORMER: 40.0VA
FAN COIL/HEATER: 11.8VA
REMAINING VA AVAILABLE: 28.2VA
LEGEND
1. Use copper wire (75˚C min.) only between disconnect switch and unit.
2. To be wired in accordance with N.E.C. and local codes.
3. If any of the original wire, as supplied, must be replaced, use the same or
equivalent type wire.
4. Replace low voltage fuse with no greater than 5 amp fuse.
5. Use 60 amp class K fuses only, for replacement.
6. (3) speed motor shown. Optional (2) speed motor uses HI (BLK) and LOW
(BLU or RED).
7. Connect R to R, G to G, etc., see outdoor instruction for details.
8. Smaller heaters will have fewer components.
SEE NOTE #6
GND
RED-LOW
BLU-MED
BLK-HI
GRN/YEL-GND
FM
BRN
BRN
YEL-COM
FAN MOTOR THERMALLY PROTECTED
CAP
GND
324984-101 REV. A
FIELD POWER WIRING
DISCONNECT PER NEC
SEE RATING PLATE
FOR VOLTS & HERTZ
GND
L4
L2
L1
L3
HTR4
BLK
4
YEL
LS4
YEL
2
BLK
HTR3
BLK
8
LS3
6
RELAY 2
BLK
HTR2
BLK
4
YEL
LS2
YEL
2
YEL
BLK
HTR1
BLK
4
LS1
2
RELAY 1
BLK
YEL
HT
R4
FU
4
FU
2
L2
CB1
L4
CB2
FU
1
FU
3
L3
CB1
L1
CB2
LS1
LS2
INTERNAL PROTECTION MAY
BE EITHER FUSES OR CIRCUIT
BREAKERS
L4
L3
CB1
60A 60A
L2
L1
CB2
60A 60A
NOTES:
MINIMUM MOTOR SPEED SELECTION
FAN COIL SIZE
LO LO
MOTOR SPEED AT 20 KW
-- MED LO LO
018 024 030 036 042 048 060 070
--
LO
PLUG
4
4
6 1
1
6
RECP
VI
O
BL
U
9
9
BARRIER
YEL
BRN
W
G
GR
Y
OUTDOOR
UNIT
SEE NOTE #8
SEE NOTE #1
NC
NO
SPT
FR
T
C
1
R
G
PCB
F
THIS COMPARTMENT MUST BE CLOSED EXCEPT FOR SERVICING
CAUTION:
ATTENTION:
NOT SUITABLE FOR USE ON SYSTEMS EXCEEDING 150V
TO GROUND
NE CONVIENT PAS AUX INSTALLATIONS DE PLUS DE
150 V A LA TERRE
BLOWER MOTOR
ROTATION
SCHEMATIC DIAGRAM
F
1
SPT
GRY
BLU
BLK
WHT
RED
G
PCB
BLK
BRN
R
C
INDOOR
THERMOSTAT
RE
D
WH
T
BR
N
C
T
R
FR
7
11
7
11
3
2
2
3
VIO
ORN
BLU
BLK
NC
NO
LS 3
& 4
230V
208V
BRN
RED
TRAN
CO
M
GRN
YEL
GND
YEL
LO
MED
HI
COM
RED
BLU
YEL
BLK
FM
BRN
BRN
CAP
BLK
R E C
RELAY 1
22 VDC COIL
TDR
HEATER
LIMIT SWITCH
MARKED TERMINAL
PLUG AND
RECEPTACLE
PRINTED CIRCUIT
BOARD
RECTIFIER
TRANSFORMER
UNMARKED
TERMINAL
TIME DELAY
RECTIFIER
CIRCUIT BREAKER
CAPACITOR
COMMON
LOW VOLTAGE
FUSE
FAN MOTOR
FIELD POWER
WIRING
PCB FAN RELAY
LINE FUSE
EQUIPMENT GROUND
FAN SPEED TAP
LOCATION
REC
HTR
LS
PCB
TRAN
CB
CAP
COM
F
FM
FR
FU
GND
SPT
BLU
W2
RELAY 3
RELAY 2
RELAY 3
22 VDC COIL
R E C
RELAY 2
22 VDC COIL
T D R
BRN
BRN
GRY
RED
R1
R2
R3
FU3
FU1
FU4
FU2
L3
L1
L4
L2
RELAY 1
RELAY 2
REC
TDR
RELAY 3
8
6
4
2
1
0
8
6
4
2
1
0
8
6
4
2
1
0
TDR
9