Lennox ECB21-12.5-1P, ECB21, ECB21-20.0-1P, ECB21-25.0-1P, ECB21-30.0-1P Installation Instructions Manual

Supersedes 502,704M

ELECTRIC UNITS ECB21 SERIES HEATERS

INSTALLATION INSTRUCTIONS FOR ECB21 SERIES ELECTRIC

HEAT SECTIONS USED IN B21/CB21/CBH21 APPLICATIONS

503,018M
9/93

I--SHIPPING AND PACKING LIST
Package 1 of I contains:

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

I

CB/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

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--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

ECB21 ELEMENT _.j

ASSEMBLY

UPPER
FILLER

PLATE\

I

I

f

OPENING

IN 51/65

_L

I

FIGURE 3

FILLER

PLATE

\

ECB21 ELEMENT

FACE PLATE

OPENING

21/26/31/41

VESTIBULE

PANEL

UPPER
FILLER

IN

Page 2

ECB21* q5.0**lP

FACEPLATE

FIGURE 4

BLOWER

DECK

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_

FOR HEATING

HEAl"

PUMP

ONLY

8

8

8

HEAT

PUMP

WITH

ELEC.

HEAT

6 8
6 8

7 9

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

LOW- -

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

CONTROL

INTERFACE

PLUG

= = I"

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

CLASS2 VOLTAGE FIELD INSTALLED
NEC/CEC

NOTE-ALL REMAINING WIRES
FACTORY INSTALLED

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

] I I'L,I,_..,I,,.,,,_--..,I,----.., .... _,l,_ J _,,_ n I .

. iI.,,...,,,I,,I,_ ....,,.____.,. ..... ,,__ __ ._,I,_._,_ .__,,_ J

_-I,--4,--,I,,,',.- -"1"--- ----.,I'- -- -- -- -...,i'- -- -" ,--"'1"- -...'1'--n

I I I IL --,_.L- _ I I I

I _-J L /

"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 2 3VA 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

Z_ FACTORY INTSALLED JUMPERS
Z_ COMMON TERMONAL "C" LABELD

"X" ON EARLY NODELS CCB1 - -1.

FIGURE 8

Page 5

COOLING APPLICATION WITH ELECTRIC HEAT

,N

TRANSFORMER

NOTE-USE COPPER
CONDUCTORSONLY

A15 BLOWER
DRIVE CONTROL

Ln @ @ @ HEAT ELEMENT 2

_o _ i_ LI

00===_ HE(z)

0 r_ "r_HE( I)_ 0 r_

K32 R 6

TB2
TERMINAL
BLOCK

..%

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]lI I I

" _'', C"...L-----JjI' Ill I

r. -.--__J.- -_..IJ_,..vl.--JJ

i J-.

GROUND

/1,, z_

_LI

CIRCUIT2

L2
L3 Z_

I

!

VV V LINE VOLTAGE FIELD INSTALLED

,'I,,

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

WHEN TWO STAGE THERMOSTAT

IS USED, CONNECT SECOND

STAGE HEAT BULB TO TERMINAL

"WZ," REMOVE JUMPER

BETWEEN TERMINALS

"R" AND "W2"

/,k

THERMOSTAT HEAT

ANTICIPATION SETTING

•4 AMP (ELECTRIC HEAT)

]J

CLASS 2 VOLTAGE FIELD INSTALLED L_ L3FORTHREE PHASE

NEC/CEC HEATERSONLY

L_CCBI-I L_

TERMINAL BLOCK

z_

FIELD INSTALLED JUMPERS REQUIRED

FOR TERMINAL STRIP TB1

Humidity Outdoor Unit

Control

With CCB1

Humidity

Control
Without

CCB1

Humidity

Control

/6,

FACTORY INSTALLED JUMPERS

Zk

COMMON TERMINAL "C" LABLED "X" ON
EARLY MODELS CCB1- -t.

FIGURE 9

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

Page 6

FIELD WIRING FOR ECB21

5 KW SINGLE--PHASE HEATERS

/,_ Sl

P,®e

I I I

-_-- L_.

i I i i

i t I I /),_

F'II I

I I I

THERMOSTAT

A

TB1

TERMINAL

BOARD

.o-_o

o-_

.o-_o

-o2<:)

02-0

,ill

GROUND

K3

INDOOR BLOWER

RELAY ! J2

K32 HEAT RELAY

RESISTOR

U

/ \j

1

HE@)

U

i

TRANSFORMER

T1

P2

NOTE- -USE COPPER
CONDUCTORS ONLY

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.

II

CIRCUIT NO.2

L2 L1

208- -240/60/1

FIGURE 10

D
D

TB2

TERMINAL

BLOCK

RED

BLACK

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.

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

_/P2 K3

INDOOR BLOWER

9 J2 RELAY

K32 HEAT RELAY

TRANSFORMER

/--\

I I

J2* -8

P2- -8 //

L_ I____ , I Z_ r"-'_

i

NOTE* *USE COPPER |
CONDUCTORS ONLY

//_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 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.

/

1

CIRCUIT NO. 2

L2 L1

208- -240/60/1

_3

LI_ BLACK BLACK
TB2

TERMINAL

BLOCK

A FACTORY INSTALLED JUMPERS

A OMMON TERMINAL "C" LABLED "X" ON

P2

X/

I \ /J2

R )

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! J l--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

K3

INDOOR
BLOWER

RELAY

P2@

J2_/

K33 HEAT RELAY

wq

E

8 _ P2

TRANSFORMER

I T1

J2

HEg) HE(2)

@@

I

_i RED

_ BLACK BLACK

NOTE-*USE COPPER
CONDUCTORS ONLY

/k

TO EXTERNAL LOAD 24VAC AT .50 AMP MAXIMUM.

A

NEC/CEC CLASS 2

A

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.

z_

THERMOSTAT HEAT ANTICIPATION SETTING .4 AMP

(ELECTRIC HEAT) //_ COMMON TERMINAL "C" LABLED "X" ON

z_

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.

Jl

CIRCUIT NO 2

L2 L1

208- -240/60/1

TB2

TERMINAL

BLOCK

FIGURE 12

LINE VOLTAGE FIELD INSTALLED
CLASS 2 VOLTAGE FIELD

INSTALLED NEC/CEC

NOTE-*ALL OTHER

WIRES FACTORY

INSTALLED

/%

FACTORY INSTALLED JUMPERS

EARLY MODELS CCBt- -1.

qll'

GROUND

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

I,_P2 K3 INDOOR BLOWER

J2 RELAY

J2 1(( P2

A K33 HEAT RELAY

K32 HEAT RELAY

P2-*9

/

K34 HEAT RELAY

P2

TRANSFORMER

I T1I

w w

@@@

HE(l] HE(2: HE(3] HE(4)

t

TB2 GROUND

TERMINAL

NOTE--ALL OTHER
WIRES FACTORYtNSTALLED

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-

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- -

--STAGE HEAT BULB TO TERMINAL "W2." REMOVE JUMPER
BETWEEN TERMINALS "R" AND "W2."

i LINE VOLTAGE FIELD INSTALLED

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

/,ok

EARLY

CLASS 2 VOLTAGE FIELD INSTALLED
NEC/CEC

MODELS CCB1

BLOCK

FIGURE 13

Page 10

FIELD WIRING FOR ECB21 25 OR 30 KW SINGLE--PHASE HEATERS

------ CLASS 2 VOLTAGE FIELD

FIELD INSTALLED

INSTALLED NEC/CEC

NOTE--ALL OTHER
WIRES FACTORYtNSTALLED

CIRCUIT NO

L1 L2

K3 INDOOR BLOWER

[]

K33 HEAT RELAY K35 HEAT RELAY

J2 P2 K32 HEAT RELAY

U

TRANSFORMER

O

Kl16 HEAT RELAY

R6

RESISTOR

HE( HE(_ _HE(8 HE(z qE(5 HE(6

O©©OO©

_T

GROUND

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*
THERMOSTAT HEAT ANTICIPATION SETTING .4 AMP

A //_ TWEEN "R" AND "W3".

(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

REFER TO JUMPER APPLICATION TABLES IN TYPICAL HEAT

Page 11

A $1

THERMOSTAT

A

FIELD WIRING FOR ECB21 5, 7.5, 10

AND 15 Kw THREE--PHASE HEATERS

rr-_J2__L__Ji (; TER_;NAL

L_(?! I 1I t i

vv IVII I _1 L I t

II I li I-- " v

/_11 I I II I _

I I I o

-- BOARD

K3 INDOOR

BLOWER

RELAY

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

TRANSFORMER

j@ €)@

HE(l) HE(2) HE(3)

@@@

J

GROUND

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 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-

A FACTORY INSTALLED JUMPERS

A OMMON TERMINAL "C" LABLED "X" ON

FIGURE 15

Page 12

CAL HEAT PUMP ORCOOLING WIRING DIAGRAMS IN
THIS INSTRUCTION.

EARLY MODELS CCB1- -1.

FIELD WIRING FOR ECB21 20, 25 Kw THREE--PHASE HEATERS

A $1

THERMOSTAT

F@®®o®®QQI A

_t" i I / I I TBt

K3

iNDOOR BLOWER

RELAY

TRANSFORMER

A

II I I If___

L, _--t--_--q [--g2gaO

rJ ,

COB1--1 TERMINAL BLOCK A

FIELD iNSTALLED 208_-240/60/3

CLASS 2 VOLTAGE
FIELD INSTALLED

NEC/CEC

NOTE* *ALL OTHER
WIRES FACTORY

INSTALLED

CIRCUIT NO. 2

L1 L2 L3

CIRCUIT NO. 3
208* -240/60/3

L1 L2 L3

P2 _--

Ed

E

TB2

TERMINAL

BLOCK

[]

[]

[]

K33 HEAT RELAY K35 HEAT RELAY

K34 HEAT RELAY

@41-_-

HE(l: HE(2 HE(3 HE(4 4E(5) HE(6

TI

J2

/\

8

A

P2

R6

RESISTOR

7

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.

4_t_, ,

_CB<_

, ,O 0
, ,,0 0

0

GROUND

00%

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"

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

JUMPER

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

Page 14