Lennox ECB21-12.5-1P User manual

503,018M
9/93
Supersedes 502,704M
ELECTRIC UNITS ECB21 SERIES HEATERS
INSTALLATION INSTRUCTIONS FOR ECB21 SERIES ELECTRIC
HEAT SECTIONS USED IN B21/CB21/CBH21 APPLICATIONS
I--SHIPPING AND PACKING LIST
Package 1of Icontains:
1-- Assembled electric heat section
1- - Filler plate for use with:
ECB21- -5.0- -1P,ECB21- -6.0- -1P,
ECB21- -7.0- -1P,ECB21- -8.0- -1P,
ECB21- -10.0- -1P, ECB21- -20.0--1P
2-- Wiring diagram stickers
II--SHIPPING DAMAGE
Check heater forshipping damage. The receiving party
should contact the last carrier immediately ifany dam-
age is found.
Ill--GENERAL
These instructions are intended as a general guide
and do not supersede local or national codes in any
way. Authorities having jurisdiction should be con-
sulted before installation.
IV--REQUIREMENTS
Installation of Lennox blower coil units with electric heat
must conform with standards in National Fire Protection
Association (NFPA) "Standard for Installation of Air
Conditioning and Ventilating Systems NFPA No. 90A,"
"Standard for the Installation of Residence- -Type Warm
Air Heating and Air Conditioning Systems NFPA No.
90B," manufacturer's installation instructions and local
municipal building codes.
This unit is approved for installation clearances to com-
bustible materials as listed on the unit heater installed
nameplate located on the blower coil unit. Accessibility
and service clearances must take precedence over
combustible material clearances.
,& WARNING
V- -APPLICATION
ECB21 series heaters are designed to provide field
installed electric heat for B21 blower units and CB21
and CBH21 series blower coil units.
_]_rat Ical _1993 Lennox Industires Inc.
ure Page 1

VI--INSTALLATION
NOTE--If replacing an existing electric heat section, dis-
connect and remove the existing heat section and wiring.
1- - Disconnect power to B21!CB21/CBH21 unit.
2-- Remove blower access panel.
3-- Remove circuit breaker knockout on blower/blow-
er coil access cover in applications using an
ECB21 12.5, 15.0, 20.0, 25.0 or 30.0--Y, --P volt-
age heater in a CB/CBH21--41 or B/CB21--51/65
unit (See figure 1).
KNOCKOUTS IN B/CB/CBH21 UNIT
ACCESS PANEL
ICB/CBH21--41
REMOVE LARGER KNOCKOUT FOR USE WITH
ECB21-q5.0--1Y HEATER; REMOVE BOTH KNOCKOUTS
IF ECB21--12.5/15.0/20.0--1P HEATERS ARE USED.
B/CB21 - -51/65
ECB21--15.0--1Y HEATER IS USED.
REMOVE ALL THREE KNOCKOUTS IF ECB21- -25.0/30.0- -1P
OR ECB21--20.0/25.0--1Y HEATERS ARE USED.
FIGURE 1
ECB21 IN CB/CBH21--41
CIRCUIT BREAKER POSITION
ECB21 IN B/CB21--51/65
CIRCUIT BREAKER POSITION
4-- Remove blank filler plate(s) in control box.
5-- Adjust circuit breaker mounting bracket according
to B21/CB21/CBH21 application. Bracket adjusts
forward by removing mounting screws, reposition-
ing bracket and reinserting screws (See figure 2).
6- - Slide ECB21 heat section into opening. Hole(s) on
each side of ECB21 line up with holes in control
box (See figure 3). Reinstall screws to secure heat
assembly. On the following ECB21 heaters, circuit
breakers line up with the opening in the access
cover: ECB21 12.5, 15.0, 20.0, 25.0 and 30.0 kwY
and P voltage heaters.
7- - When installing 5.0, 6.0, 7.0, 8.0, 10.0 and 20.0 kw
P voltage heaters; 5.0, 7.5, 10.0 and 15.0 kw Y volt-
age heaters in CB/CBH21--41 or B/CB21--51/65
units, a filler plate(s) (provided) must be used to
seal the element opening (See figures 3 and 4).
FILLER PLATE
VESTIBULE PANEL
ECB21 ELEMENT _.j
ASSEMBLY
FIGURE 3
UPPER
FILLER
PLATE\
I
If
OPENING
IN 51/65
_L I
FILLER
PLATE
\
ECB21 ELEMENT
FACE PLATE
OPENING
IN
21/26/31/41
VESTIBULE
PANEL
UPPER
FILLER
ECB21* q5.0**lP
FACEPLATE
FIGURE 4
BLOWER
DECK
Page 2

VII--FIELD WIRING CONNECTIONS
Refer to field wiring diagrams on pages 5 through 13.
IMPORTANT--On the units listed below, field power
supply wiring must be connected to the circuit breakers
and NOT the line voltage terminal block.
ECB21- -12.5- -1P ECB21- -15.0- -1Y
ECB21- -!5.0- -1P ECB21- -20.0- -1Y
ECB21- -20.0- -1P ECB21- -25.0- -1Y
ECB21- -25.0- -1P
ECB21- -30.O--1P
Power wiring for all other ECB21 heaters installed in B/CB/
CBH21 blower coil units should be connected as follows:
1- - Connect black power wire(s) marked "L1"to L1 ter-
minal of TB2 terminal block.
2-- Connect red power wire(s) marked "L2" to L2 ter-
minal of TB2 terminal block.
NOTE- -All power wires on three- -phase heaters are
black.
3--Three--Phase Heaters Only .... Connect black
power wire(s) marked "L3" from ECB21 heater to
L3 terminal on TB2 terminal block.
4-- Heaters are supplied with an interconnecting jack
plug attached to each assembly. Connect the plug
from the heater to the matching plug inside the
blower coil unit.
5-- Heaters may be used with thermostats which con-
tain a second--stage heat bulb or with an outdoor
thermostat.
If indoor thermostat contains a second--stage
heat bulb, disconnect wire labeled "W2" from ter-
minal "R" ofTB1 terminal block and connect wire to
second--stage heat bulb.
If an outdoor thermostat is used, connect wire la-
beled "W2" to the outdoor thermostat. Refer to the
unit wiring diagram.
6-- Replace blower compartment access cover.
7-- Two ECB21 wiring diagrams have been included
with the heater. Affix one diagram on the
CB21/CBH21 unit next to the unit wiring diagram.
Affix the second wiring diagram in the outdoor unit
near the CB21 wiring diagram.
NO TE- -Refer to blower coil unit namepla te for mini-
mum circuit ampacity and maximum overcurrent
protection size.
VIII--COMPLETE INSTALLATION
Refer to CBiCBH21 installation instructions for com-
plete plumbing and drain connections, as well as duct
system installation.
IX--BLOWER MOTOR SPEEDS
A--Air Volume Adjustment
CB21 and CBH21 units are equipped with a variable
speed motor that is capable of maintaining a specified
CFM throughout the external static range. Select 1 of 11
speed taps located behind the tap cover on the motor/
controller to obtain a particular CFM. See figure 6 for tap
cover, AC power and control interface plug locations.
Refer to figure 7 for speed taps, high speed, low speed
and heat speed connectors. Refer to table 1 for mini-
mum blower speed tap for heating.
TABLE 1
MINIMUM BLOWER SPEED TAP,'
HEAT
PUMP
HP21- -411
HP21* -511
HP21* -651
BLOWER
COIL
CB21- -41- -1P
CBH21- -41- -1P
CB21- -51- -1P
B21/CH21- -51- -1P
CB21- -65- -1P
B21/CH 19- -65- -1P
ELECTRIC
HEAT ONL_
8
8
8
FOR HEATING
HEAT
HEAl"
PUMP
ONLY
6 8
6 8
7 9
PUMP
WITH
ELEC.
HEAT
The B21--51/65 is factory wired for CH19--65 ap-
plications and must be field wired for CH21 --51 ap-
plications.
B--Blower Speed Adjustment Procedure
Use the following procedure to change blower speed
selection for high, low or heat speed selection:
, WARNING
1-- Disconnect line voltage from unit.
2-- Disconnect AC power plug from motor/controller.
See figure 6.
3-- Slide the tap cover toward AC power connection.
See figure 6.
4--Remove the appropriate speed connector and
place it on the proper tap. See figure 7.
Page 3

5--Whenallspeedconnectionsaremadetoproper
taps,closetap coverand reconnectACpower
plugtomotor!controller.
6--Reconnectlinevoltagetounit.
o%oo .o%OR°-
E
Io o-
FIGURE 6
CONTROL
INTERFACE
PLUG
LOW- -= = I"
WHITE CONNECTOR _ HEAT--RED CONNECTOR
HIGH--BLACK CONNECTOR TAP #1
TYPICAL VIEW--PINS NOT IN ANY ORDER
FIGURE 7
X--POWER WIRING CONNECTIONS
Refer to nameplate on blower coil unit for minimum circuit
ampacity and maximum overcurrent protection size. If
single point power supply is desired, refer to nameplate
on single point power supply accessory or see table 2
for minimum circuit ampacity and maximum overcur-
rent protection size. Select the proper supply circuit
conductors in accordance with tables 310--16 and
310--17 in the National Electric Code, ANSl/NFPA No.
70 or tables 1 through 4 in the Canadian Electric Code,
Part I, CSA Standard C22.1.
TABLE 2
MINIMUM CIRCUIT AMPAClTY & MAXIMUM
OVERCURRENT PROTECTION SIZES FOR
SINGLE POINT POWER SUPPLY APPLICATIONS
CB/CBH21- -41 B21- -51/65
ECB21
Elelctric Minimum Maximum Minimum Maximum
Heat Cirucit Overcurrent Cirucit Overcurrent
Ampacity Protection Ampacity Protection
208/240V 208/240V 208/240V 208/240V
--12.5--P 64/72 70/80 68/77 70/80
- -15.0- -P 75/85 80/90 79/90 80/90
--20.0--P 97/11t 110/125 101/116 110/125
--20 O- -Y - - 1.... /--63/72 70/80
- -25.0- -P -- /.... /-- 124/142 125/150
--25.0- -Y - - /.... 1- - 77/87 80/90
- -30.0- -P -- /.... /-- 146/168 150/175
The blower coil units are provided with knockouts for
use with 1- -1/2 inch trade size (1- -31/32 inch diameter)
conduit. A conduit mounting plate has been pro-
vided for use if installing smaller conduit.
XI--FIELB WIRING
Figure 8 and 9 respectively show typical heat pump
and condensing thermostat wiring when electric heat is
used,. Refer to figures on the following pages for field
wiring of electric heat elements in blower coil units.
NOTE--When installing CB21/CBH21 unit with or with-
out "Efficiency Plus" CCB1 (A20), or with matches other
than HP21, jumper wires maybe needed for proper op-
eration. Refer to tables and notes in figures 8--16 for
proper application of jumper wire.
CAUTION--Incorrect placement of jumper wire on
TB1 terminal board will reslut in damage to CCB1
control.
Page 4

HEAT PUMP WITH ELECTRIC HEAT
Z__ EM HT RELAY
__K22
r- --r'-z'-./i1
S23 OUTDOOR
THERMOSTAT I-Y-_ II s, THERMOSTAT z_
(IF USED) _ _
TBI -- -- -- ;q _(_ _v._ 1
( I '
ot;t to'ot ,- -,,,,,,,,,,-_,k_,,,__+_,,
I_)L)_( ..(.r)(,,2q (,-)(.,.).P,.,d _ '
:rilr.lt:lr 1. :/"_", rL'-d':_I_--- _ ! I i i I '
I I I I i"1","C-_i_.;:_1",'1_= _'_" - I I I
,ll ; _-"z"_ -_";'- -- -1'- -- -"- -"--'1"--1
I II I' ' ,-_.,.,___--q.,I .--, i ' . •
I it -I .... _ .... ,,-",.-- -- .--"--',',-.J I ,
i,,,._._,,____.,_____.,___ j I I I
] II'L,I,_..,I,,.,,,_--..,I,----.., .... _,l,_ J _,,_ n I .
. iI.,,...,,,I,,I,_ ....,,.____.,. ..... ,,__ __ ._,I,_._,_ .__,,_ J
_-I,--4,--,I,,,',.- -"1"--- ----.,I'- -- -- -- -...,i'- -- -" ,--"'1"- -...'1'--n
I_-J L/
I I I IL --,_.L- _ I I I
"1__ i CCBI-I UUIY; IYII ;J U U J J
I F;_ll'JJ'_-_ll-_'IF_T]F'_"IF'_-llTERMINAL BLOCK _ _ _--
'_JUL_J_JL._JL_JL_JL._J _ _I z
z_ THERMOSTAT HEAT ANTICIPATION 0 _I _I
SETTING .'€AMP (ELECTRIC HEAT) _,o,Io,I
Z_ WHEN TWO STAGE THERMOSTAT IS USED, _: _1 61
cONNECT SECOND STAGE HEAT BULB TO _-I_<1
TERMINAL W2, RB_IOVE.JUMPERBETWEEN _
TERMINALS"R"AND
/_ IHENOUTDOORTHERMOSTATIS USED, . q q
CONNECT LEADS TO TERMINALS "R AND W2," _1 _1
RE_VEJUMPERBETWEEN"R"AND"_" al OI
Z_ EMERGENCYHEATRELAY(USEDONLYIF _l _l
OUTDOOR THERMOSTAT IS USED] FIELD I >I
PROVIDED AND INSTALLED NEAR INDOOR
UNIT Z&VAC BVA MAX NEC CLASS 2
Z_ NEC/CEC CLASS 23VA HEAT PUMP CLASS 2
Z_ VOLTAGE TERMINALS
FIELD INSTALLED JUMPERS REQUIRED
FOR TERMINAL STRIP TB1
Humidity
Control
With COB1
Humidity
Control
Without CCBt
Humidity
Control
Outdoor Unit
Single-Speed Heat Pump
Two-Speed Heat Pump
Single-Speed Heat Pump
Two-Speed Heat Pump
Jumpers
Required
Y1 to Y2
none
DS to Y1
DS to Y2
CLASS2 VOLTAGE FIELD INSTALLED
NEC/CEC
NOTE-ALL REMAINING WIRES
FACTORY INSTALLED
Z_ FACTORY INTSALLED JUMPERS
Z_ COMMON TERMONAL "C" LABELD
"X" ON EARLY NODELS CCB1 - -1.
FIGURE 8
Page 5

COOLING APPLICATION WITH ELECTRIC HEAT
TRANSFORMER
A15 BLOWER
DRIVE CONTROL
Ln @ @ @ HEAT ELEMENT 2
00===_ HE(z) TB2
TERMINAL
BLOCK
0 r_ "r_HE( I)_ 0 r_
_o _ i_ LI
K32 R 6
..%
I-I _oo.' 'TB,TERMINALBOARD_
CBO LO*ERRELAY
L2 cI _ ', [I (,I (,I I I_.__ --_ (I
z0e-zsoz6o/i THE._bSTAT.--, _- "-'",'"VL_'_l__."-"1 " '
t'I'd"]I]lII I
" _'', C"...L-----JjI' Ill I
r. -.--__J.- -_..IJ_,..vl.--JJ
]J
I!
VV V LINE VOLTAGE FIELD INSTALLED
,'I,,
,N
i J-.
GROUND
NOTE-USE COPPER
CONDUCTORSONLY
/1,, z_
_LI CIRCUIT2
L2
L3 Z_
L_CCBI-I L_
TERMINAL BLOCK
CLASS 2VOLTAGE FIELD INSTALLED L_ L3FORTHREE PHASE
NEC/CEC HEATERSONLY
NOTE-ALL REMAINING WIRES FACTORY INSTALLED
REFER TO UNIT RATING
PLATE FOR MINIMUM
CIRCUIT AMPACITY AND
MAXIMUM OVERCURRENT
PROTECTION SIZE
L_ TO EXTERNAL LOAD 24VAC
AT .50AMP MAXIMUM
L_ NECICEC CLASS 2 5VA
/,k
WHEN TWO STAGE THERMOSTAT
IS USED, CONNECT SECOND
STAGE HEAT BULB TO TERMINAL
"WZ," REMOVE JUMPER
BETWEEN TERMINALS
"R" AND "W2"
THERMOSTAT HEAT
ANTICIPATION SETTING
•4 AMP (ELECTRIC HEAT)
z_
/6,
Zk
FIELD INSTALLED JUMPERS REQUIRED
FOR TERMINAL STRIP TB1
Humidity Outdoor Unit
Control
With CCB1
Humidity
Control
Without
CCB1
Humidity
Control
FACTORY INSTALLED JUMPERS
Single-Speed
Condensing Unit
Two-Speed
Condensing Unit
Single-Speed
Condensinq Unit
Two-Speed
Condensing Unit
Jumpers
Reauired
Y1 to Y2 and
Ote R
Ote R
DS to Y1 and
Ot0 R
DS to Y2 and
Oto R
COMMON TERMINAL "C" LABLED "X" ON
EARLY MODELS CCB1- -t.
FIGURE 9
Page 6

FIELD WIRING FOR ECB21
/,_ Sl
THERMOSTAT
P,®e
I I I
-_-- L_.
i I i i
itI I /),_
F'II I
I I I
A
TB1
TERMINAL
BOARD
.o-_o
o-_
.o-_o
-o2<:)
02-0
,ill
GROUND
NOTE- -USE COPPER
CONDUCTORS ONLY II
CIRCUIT NO.2
L2 L1
208- -240/60/1
5 KW SINGLE--PHASE HEATERS
K3
INDOOR BLOWER
RELAY ! J2
K32 HEAT RELAY
RESISTOR
D
D
TB2
TERMINAL
BLOCK
TRANSFORMER
/\j
T1
P2
1
HE@)
RED
BLACK
UU
i
Z_TO EXTERNAL LOAD 24VAC AT .50 AMP MAXIMUM.
Z_ NEC/CEC CLASS 2 3VA
//_ SEE FIGURE 7 FOR TYPICAL HEAT PUMP T'STAT WIRING.
EMERGENCY HEAT RELAY (USED ONLY IF OUTDOOR
THERMOSTAT IS USED) FIELD- -PROVIDED AND IN- -
STALLED NEAR INDOOR UNIT. 24VAC 5VA MAXIMUM
NEC/CEC CLASS 2.
,_ THERMOSTAT HEAT ANTICIPATION SETTING .4 AMP
(ELECTRIC HEAT) Z_
//_ REFER TO JUMPER APPLICATION TABLES tN
TYPICAL HEAT PUMP OR COOLING WIRING
DIAGRAMS IN THIS INSTRUCTION.
LINE VOLTAGEFIELD INSTALLED
CLASS 2 VOLTAGE FIELD tNSTLLED
NEC/CEC
NOTE* *ALL OTHER
WIRES FACTORY INSTALLED
FACTORY INSTALLED JUMPERS
COMMON TERMINAL "C" LABLED "X" ON
EARLY MODELS CCB1- -1.
FIGURE 10
Page 7

FIELD WIRING FOR ECB21 6, 7, OR 8 KW SINGLE--PHASE HEATERS
/_ S1
THERMOSTAT
r
,[-r-_- ÷ -*-_---_-J I
^ _r-'_--_, t-
/,\ I_ I ,, I
II I I L
__-I,-----.-,L----"
IL F_J'- I ""
A
TB1
TERMINAL
BOARD
L_ I____ , IZ_ r"-'_
i
/
NOTE* *USE COPPER |
CONDUCTORS ONLY 1
CIRCUIT NO. 2
L2 L1
208- -240/60/1
//_TO EXTERNAL LOAD 24VAC AT .50 AMP MAXIMUM.
_/P2 K3
INDOOR BLOWER
9 J2 RELAY
K32 HEAT RELAY
_3
LI_ BLACK BLACK
TB2
TERMINAL
BLOCK
P2- -8 //
P2 X/
I \ /J2
TRANSFORMER
/--\
I I
J2* -8
R )
NEC/CEC CLASS 2 3VA
SEE FIGURE 7 FOR TYPICAL HEAT PUMP T'STAT WIRING.
EMERGENCY HEAT RELAY (USED ONLY IF OUTDOOR
THERMOSTAT IS USED) FIELD- -PROVIDED AND IN--
STALLED NEAR INDOOR UNIT. 24VAC 5VA MAXIMUM
NEC/CEC CLASS 2.
THERMOSTAT HEAT ANTICIPATION SETTING .4 AMP
(ELECTRIC HEAT)
REFER TO JUMPER APPLICATION TABLES tN
TYPICAL HEAT PUMP OR COOLING WIRING
DIAGRAMS IN THIS INSTRUCTION.
A FACTORY INSTALLED JUMPERS
A OMMON TERMINAL "C" LABLED "X" ON
EARLY MODELS CCB1- -1.
LINE VOLTAGE FIELD INSTALLED
CLASS 2 VOLTAGE FIELD iNSTALLED
NEC/CEC
NOTE-*ALL OTHER
WIRES FACTORY INSTALLED
FIGURE 11
Page 8

FIELD WIRING FOR ECB21 10.0 KW SINGLE--PHASE HEATER
//_ S1
THERMOSTAT
i FF4_-.--I----,-I----1 _j I BOARD
vvv I! I .[I J. _.,L,_I_
A I! Jl--I--'J------ I -I---_
/l"X I I I I I I ! o
I I I I I _,L.._'I"-_ _O-_yl_
I r_-- --_
i ' I L_
1_ .... ;-_
;.......
I I' G
J i k£_:------_
I I I ]- .....
,il , i,
_F_] _CC 1._.1ERE_M_ AL_80C_K F _ Z__
B T N L
NOTE-*USE COPPER
CONDUCTORS ONLY
/k
A
Jl
CIRCUIT NO 2
L2 L1
208- -240/60/1
K3
INDOOR
BLOWER
RELAY
P2@
J2_/
K33 HEAT RELAY
wq
_ BLACK BLACK
TB2
TERMINAL
BLOCK
TO EXTERNAL LOAD 24VAC AT .50 AMP MAXIMUM.
NEC/CEC CLASS 2
A
z_
SEE FIGURE 7 FOR TYPICAL HEAT PUMP T'STAT WIRING.
EMERGENCY HEAT RELAY (USED ONLY IF OUTDOOR
THERMOSTAT IS USED) FIELD- -PROVIDED AND IN- -
STALLED NEAR INDOOR UNIT. 24VAC 5VA MAXIMUM
NEC/CEC CLASS 2.
THERMOSTAT HEAT ANTICIPATION SETTING .4 AMP /%
TRANSFORMER
I T1
EJ2
8 _ P2
HEg) HE(2)
@@
_i RED
I
LINE VOLTAGE FIELD INSTALLED
CLASS 2 VOLTAGE FIELD
INSTALLED NEC/CEC
NOTE-*ALL OTHER
WIRES FACTORY
INSTALLED
FACTORY INSTALLED JUMPERS
z_
GROUND qll'
(ELECTRIC HEAT) //_ COMMON TERMINAL "C" LABLED "X" ON
EARLY MODELS CCBt- -1.
WHEN TWO- -STAGE T'STAT IS USED, CONNECT
SECOND- -STAGE HEAT BULB TO TERMINAL "W2."
REMOVE JUMPER BETWEEN TERMINALS "R" AND "W2."
Z_ REFER TO JUMPER APPLICATION TABLES IN
TYPICAL HEAT PUMP OR COOLING WIRING
DIAGRAMS IN THIS INSTRUCTION.
FIGURE 12
Page 9

FIELD WIRING FOR ECB21 12.5, 15.0 OR 20.0 KW SINGLE--PHASE HEATERS
A THERMOSTAT
A
CIRCUIT NO 2 CIRCUIT NO 3
208- _240/60/1 208* -240/60/1
L1 L2 L1 L2
NOTE--ALL OTHER
WIRES FACTORYtNSTALLED
I,_P2 K3 INDOOR BLOWER
J2 RELAY
/
J2 1(( P2
A K33 HEAT RELAY
K32 HEAT RELAY
P2
A TO EXTERNAL LOAD 24VAC AT .50 AMP MAXIMUM.
A NEC/CEC CLASS 2 3VA
ASEE FIGURE 7 FOR TYPICAL HEAT PUMP T'STAT WIRING.
EMERGENCY HEAT RELAY (USED ONLY IF OUTDOOR
THERMOSTAT IS USED) FIELD- -PROVIDED AND INSTALLED
NEAR INDOOR UNIT. 24VAC 5VA MAXIMUM NEC/CEC
CLASS 2.
ATHERMOSTAT HEAT ANTICIPATION SETTING .4 AMP
(ELECTRIC HEAT)
A CONNECTIONS AT TERMINALS "E" AND "X" OF THERMO-
TRANSFORMER
I T1I
P2-*9
K34 HEAT RELAY
w w
@@@
HE(l] HE(2: HE(3] HE(4)
TB2 GROUND
TERMINAL
BLOCK
iLINE VOLTAGE FIELD INSTALLED
CLASS 2 VOLTAGE FIELD INSTALLED
NEC/CEC
t
A USE COPPER CONDUCTORS ONLY.
A REFER TO JUMPER APPLICATION TABLES IN TYPICAL
HEAT PUMP OR COOLING WIRING DIAGRAMS IN THIS
A INSTRUCTION.
FACTORY INSTALLED JUMPERS
STAT (S1) ONLY IF EMERGENCY HEAT RELAY IS USED. /_ COMMON TERMINAL "C" LABLED "X" ON
A WHEN TWO- -STAGE T'STAT IS USED, CONNECT SECOND- - /,ok EARLY MODELS CCB1
--STAGE HEAT BULB TO TERMINAL "W2." REMOVE JUMPER
BETWEEN TERMINALS "R" AND "W2."
FIGURE 13
Page 10

FIELD WIRING FOR ECB21 25 OR 30 KW SINGLE--PHASE HEATERS
FIELD INSTALLED
------ CLASS 2 VOLTAGE FIELD
INSTALLED NEC/CEC
NOTE--ALL OTHER
WIRES FACTORYtNSTALLED
CIRCUIT NO
L1 L2
K3 INDOOR BLOWER TRANSFORMER
O
[]
K33 HEAT RELAY K35 HEAT RELAY
J2 P2 K32 HEAT RELAY
U
Kl16 HEAT RELAY
R6
RESISTOR
HE( HE(_ _HE(8 HE(z qE(5 HE(6
O©©OO©
GROUND
_T
TO EXTERNAL LOAD 24VAC AT .50 AMP MAXIMUM.
,/_ NEC/CEC CLASS 2 3VA
SEE FIGURE 7 FOR TYPICAL HEAT PUMP T'STAT WIRING. /_
EMERGENCY HEAT RELAY (USED ONLY IF OUTDOORL&.X USE COPPERCONDUCTORS ONLY.
THERMOSTATIS USED) FIELD- -PROVIDED AND INSTALLED A
NEAR INDOOR UNIT. 24VAC 5VA MAXIMUM NEC/CEC/8 _ WHEN OUTDOOR THERMOSTAT IS USED, CONNECT LEADS
CLASS 2. TO TERMINALS "R" AND "W3" AND REMOVE JUMPER BE*
A//_ TWEEN "R" AND "W3".
THERMOSTAT HEAT ANTICIPATION SETTING .4 AMP REFER TO JUMPER APPLICATION TABLES IN TYPICAL HEAT
(ELECTRIC HEAT) PUMP OR COOLING WIRING DIAGRAMS IN THIS INSTRUCTION.
CONNECTIONS AT TERMINALS "E" AND "X" OF THERMO-/_
STAT ($1) ONLY IF EMERGENCY HEAT RELAY IS USED. /_uk FACTORY INSTALLED JUMPERS
A WHEN TWO* -STAGE T'STAT IS USED, CONNECT SECOND- A COMMON TERMINAL "C" LABLED "X" ON EARLY MODELS
STAGE HEAT BULB TO TERMINAL "W2." REMOVE JUMPEI_,..LL&CCBI* -1.
BETWEEN TERMINALS "R" AND "W2."
FIGURE 14
Page 11

A $1
THERMOSTAT A
rr-_J2__L__Ji (; TER_;NAL
-- BOARD
L_(?! I 1I t i
vv IVII I _1 L I t
II I li I-- "v
I I I o
/_11 II II I _
tl 4Li_ L_
Ill ! i L_ Y2
I_ .... OX)
I!LL .....
II / A ,_,w2,_,
I II I I I L_I_L)'-'U
7I t btz :i_
HI t I r+_O_
I I I F l_l I
NEC/CEC
NOTE**ALL OTHER WIRES FACTORY INSTALLED
A_ CIRCUIT NO 2
ECB21- 45 0--1Y ONLY _ 208_ _240/60/3
CIRCUIT NO 2 LI L2 L3
208- _240/60/3 _ _ _
L3 L2 L1 cCFB(I_T _ | i i
FIELD WIRING FOR ECB21 5, 7.5, 10
AND 15 Kw THREE--PHASE HEATERS
K3 INDOOR
BLOWER
RELAY
TRANSFORMER
j@ €)@
HE(l) HE(2) HE(3)
@@@
GROUND
J
ATO EXTERNAL LOAD 24VAC AT .50 AMP MAXIMUM.
A NEC/CEC CLASS 2 3VA
A SEE FIGURE 7 FOR TYPICAL HEAT PUMP T'STAT
WIRING. EMERGENCY HEAT RELAY (USED ONLY IF
OUTDOOR THERMOSTAT tS USED) FIELD--PRO-
VIDED AND INSTALLED NEAR INDOOR UNIT, 24VAC
5VA MAXIMUM NEC/CEC
A THERMOSTAT HEAT ANTICIPATION SETTING .4 AMP
(ELECTRIC HEAT)
A CONNECTIONS AT TERMINALS "E" AND "X" OFTHER-
MOSTAT ($1) ONLY IF EMERGENCY HEAT RELAY IS
USED.
A USE COPPER CONDUCTORS ONLY.
A REFER TO JUMPER APPLICATION TABLES IN TYPI-
CAL HEAT PUMP OR COOLING WIRING DIAGRAMS IN
THIS INSTRUCTION.
A FACTORY INSTALLED JUMPERS
A OMMON TERMINAL "C" LABLED "X" ON
EARLY MODELS CCB1- -1.
FIGURE 15
Page 12

A
FIELD WIRING FOR ECB21 20, 25 Kw THREE--PHASE HEATERS
A $1
THERMOSTAT
F@®®o®®QQI A
_t" i I /I I TBt
II I I If___
L, _--t--_--q [--g2gaO
rJ ,
COB1--1 TERMINAL BLOCK A
CIRCUIT NO. 2
FIELD iNSTALLED 208_-240/60/3
L1 L2 L3
CLASS 2 VOLTAGE
FIELD INSTALLED
NEC/CEC
NOTE* *ALL OTHER
WIRES FACTORY
INSTALLED
CIRCUIT NO. 3
208* -240/60/3
L1 L2 L3
4_t_, ,
K3
iNDOOR BLOWER
RELAY
P2 _--
Ed
E
TB2
TERMINAL
BLOCK
[]
[]
[]
K33 HEAT RELAY K35 HEAT RELAY
K34 HEAT RELAY
@41-_-
TRANSFORMER
TI
J2
_CB<_
0
,,O 0
, ,,0 0
00%
A TO EXTERNAL LOAD 24VAC AT .50 AMP MAXIMUM.
A NEC/CEC CLASS 2 3VA.
A SEE FIGURE 7 FOR TYPICAL HEAT PUMP T'STAT WIRING.
EMERGENCY HEAT RELAY (USED ONLY IF OUTDOOR
THERMOSTAT IS USED) FIELD- -PROVIDED AND
INSTALLED NEAR INDOOR UNIT. 24VAC 5VA MAXIMUM
NEC/CEC CLASS 2.
A THERMOSTAT HEAT ANTICIPATION SETTING .4 AMP
(ELECTRIC HEAT).
A CONNECTIONS AT TERMINALS "E" AND "X" OFTHER-
MOSTAT ($1) ONLY IF EMERGENCY HEAT RELAY IS
USED.
HE(l: HE(2 HE(3 HE(4 4E(5) HE(6
/\ 8
A
P2
R6
RESISTOR
7
GROUND
A WHEN TWO- -STAGE T'STAT tS USED, CONNECT SECOND-*
STAGE HEAT BULB TO TERMINAL "W2." REMOVE JUMPER
BETWEEN TERMINALS "R" AND "W2."
A USE COPPER CONDUCTORS ONLY.
A REFER TO APPLICATION TABLES IN TYPICAL HEA"
JUMPER
PUMP OR COOLING WIRING DIAGRAMS IN THIS INSTRUCTIOi_
A FACTORY INSTALLED JUMPERS
A OMMON TERMINAL "C" LABLED "X" ON EARLY MODELS
CCBI* -1.
FIGURE 16
Page 13

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@@@@@@@@@@@@@@@@@@@@@@@@
@@@@@@@@
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