FIELD WIRING FOR ECB
SERIES UNITS WITHOUT
CIRCUIT BREAKERS
A CIRCUITi_ Z2_
LI _ :
L2 _ r
ALS = : _ ALS--_--
A EOGIPMENT EQUIPMENT
GROUND GROUND
z_EQUIPMENT GROUND LOCATED IN INDOOR UNIT
CONNECT POWER WIRES PROM
A HEATER LABELED LI,LZ ON
Z_ "P" VOLTAGE UNITS AND
LI,L2,LB ON "Y" VOLTAGE
UNITS TO TB2 TERMINAL
STRIP IN INDOOR UNIT,
J2 BLUE
%-I
/
-6 _)CB8
BLUE
EQUIP (
GROUND --
FIELD WIRING FOR ECB SERIES
UNITS WITH CIRCUIT BREAKERS
CIRCUIT 3 CIRCUIT Z CIRCUIT I
A cBs Z_ z_ CB2Z_ Z_ CB_A
LI "ll"'xT % L p'mII'XT_
L2 ...le.....-2- L2"II'" 2
--Z_ LS_ -- ALB_
EQOIPMENT EQUIPMENTGROUND GROUND
A LB IS NOT PRESENT ON
L_
(P) ELECTRIC HEATERS
Z_ THE NUMBER OF CIRCUITS VARY
ACCORDING TO HEATER MODEL.
REFER TO FAN COIL NAMEPLATE
FOR ACTUAL NUMBER EMPLOYED
24V POWER R
f
A
ECON
BLOWER G
Wl
W2
CB SERIES
DESCRIPTION
KEY COMPONENT
B5 MOTOR-BLOWER
C4 CAPACITOR-BLOWER MOTOR
CB8 CIRCUIT BREAKER-TRANS TI
FI FUSE-TRANSFORMER
J2 JACK-ELECTRIC HEAT
KB,-f,_ RELAY-CONTACTORrBLOWER
K4_,-! RELAY-ECONOMIZER HEAT
T! TRANSFORMER-CONTROL
TBI TERM. STRIP-CLASS II
ECB SERIES
DESCRIPTION HT
CIRCUIT BREAKER-ELECT, HT
CIRCUIT BREAKER-ELECT,
ICB3 ICIRCUIT BREAKER_ELECT. HTI
ITB_ ITERMINAL STRIP _UNIT
MOTOR SPEED TAP CHART
3 5PD MOTOR 5 SPD MOTOR MOTOR SPEED
I I COMMON
2 2 HIGH
3 MEDIUM HIGH
5 4 MEDIUM
5 MEDIUM LOW
4 6 LOW
[_H:I 24V COMMON C
A
REFER TO FACTORY BLOWER SPEED TAP SELECTION
CHART ON UNIT FOR BLOWER SPEED INFORMATION
_L NEC/CEC CLASS 2 3VA
USE COPPER CONDUCTORS ONLY,
REFER TO UNIT RATING PLATE FOR MINIMUM
CIRCUIT AMPACITY AND MAXIMUM OVER-
CURRENT PROTECTION SIZE
A
LS CONNECTION USED ON (Y) ELECTRIC HEATERS ONLY
SPEED
MOTOR SHOWN
THIS WIRE USED ON "T"
VOLTAGE UNITS ONLY
A EBB USED ON 51 AND 61 UNITS ONLY
LINE VOLTAGE FIELD WIRING
-- -- CLASS II VOLTAGE FIELD WIRING
Figure 9. CB30U Air Handler Typical Wiring Diagram
Page 11
CB3OU/CBX27UH SERIES
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