ICP EBP1800A1, EBP1800B1, EBP2400A1, EBP2400B1, EBP3000A1 Installation Guide

Electric Heat Accessory

EBP, EBX,

Installation Instructions

EBV and EBW

1800 Thru 6000

Electrical shock hazard.

Installation or repairs made by unqualified persons
can result in hazards to you and others. Installation
must conform with local building codes or, in the
absence of local codes, with National Electrical Code
ANSI/NFPA 70-1996 or current edition.

The information contained in this manual is intended
for use by a qualified service technician familiar with

safety procedures and equipped with the proper
tools and test instruments.

Shut OFF electric power at unit disconnect and/or
service panel before beginning the following proce-

dures.
Failure to carefully read and follow all instructions in

this manual can result in malfunction, property
damage, personal injury, and/or death.

3. Disconnect 2 power wires (black and yellow pigtail leads)
from fan board or wire harness (if applicable) and discard.

Wires may be part of a plug assembly or attached to terminals
L1 and L2. Remove cooling control plate from fan coil (if

equipped). For 18-, 24-, and 30-kw heaters, remove adapt-
er plate. (See Fig. 1.)

4. Insert heater assembly into front of fan coil so that element
rods engage holes in rear heat shield.

5. Attach heater control plate to fan coil using 2 screws pro-
vided. For 18-, 24-, and 30-kw heater models, attach front

of heater to fan deck using third screw. (See Fig. 1.)

Figure 1 I Installing The Electric Heat

L

Accessory

INSTALLATION
PROCEDURE 1 -INSTALL ELECTRIC HEATER AS-

SEMBLY
NOTE: Ensure heater coils are not deformed or damaged

during heater installation.

1. Make sure power to unit is off.

2. Remove blower access panel of fan coil unit.
CAUTION: Before installation of heater, the black and

yellow pigtail leads must be removed from the fan coil

board or wire harness to prevent possible damage to the
product. Electrical power will be provided to the board

through the heater circuit plug.

GROUND LUG

/

/

ADAPTER PLA] E_

iMUST BE REMOVED WHEN

(24- AND 30-KW)

_E COVEq

- CUP LATCH

Installation of 18-, 24-, and 30-kw Model Heaters

(OMITTED ON 18-KW)

3E HEA_ER)

482 01 2226 01
May 2003

Model Description Use With

EHKOSAKN 5 Kw Single Phase All
EHKO7AKN 8 Kw Single Phase All

EHKO7AKB 8 Kw Single Phase All

EHKO9AKCN 9 Kw / Single Phase (Field convertible to 3 phase) 2-5 Ton

EHKIOAKN 10 Kw Single Phase All
EHKIOAKB 10 Kw Single Phase All

EHK15AKF 15 Kw Single Phase 2-5 Ton
EHK15AKB 15 Kw Single Phase 2-5 Ton

EHK15AHN 15 Kw 3 Phase 3-5 Ton
EHK18AHN 18 Kw 3 Phase 3 1/2 - 5 Ton

EHK2OAKF 20 Kw Single Phase 2 1/2 - 5 Ton
EHK2OAKB 20 Kw Single Phase 2 1/2 - 5 Ton

EHK25AHCF 24 Kw / 3 Phase (Field convertible to single phase) 4 - 5 Ton
EHK3OAHCF 30 Kw / 3 Phase (Field convertible to single phase) 4 - 5 Ton

All AKB Models are Circuit Breaker Models

Fan HEATER KW

Coil

Sizes 5 8 9 10 15 18 20 24 30

1800 525 525 600* - - -
2400 700 700 700 700 775* - -
3000 875 875 875 875 1060" -

3600 1050 970 970 970 920 1040 -
4200 1225 1225 1225 1225 1225 1225 -
4800 1400 1400 1400 1400 1400 1400 1400 1400

6000 1750 1750 1750 1750 1750 1750 1750 1750

Indicates medium speed (blue). All other motor speeds at low tap.

PROCEDURE 2 -ATTACH FUSE BOX OR CIRCUIT
BREAKER BOX

1. For 15- and 20-kw fused models:
After installing heater assembly, attach fuse assembly to side

of fan coil unit by inserting fuse box tab between insulation
and to left side of unit and fan deck. Mount front of assembly

to side flange with 2 screws provided. On fan coil units size

042 and larger, remove wire tie that shortens wire length be-

tween heater and fuses. Fuse cover is closed by engaging

dimples in fuse box. (See Fig. 2.)

2. For 24- and 30-kw fused models:
Fuse assembly is mounted on heater. Be sure fuse cover is

closed by engaging clip latch on unit top panel. (See Fig. 1.)

WARNING: Ensure fuse box is closed before power is

turned to ON position. Electrical shock may cause per-
sonal injury or death.

3. For 5- through 20-kw circuit breaker models:
After installing heater assembly, attach circuit breaker as-

sembly to unit with screws provided. (See Fig. 3.) On fan coil
units size 4200 and larger, remove wire tie that shortens wire

length between heater and circuit breaker assembly to allow
mounting of circuit breaker assembly. (See Fig. 3.)

4. Circuit breaker models require installation of a window
bezel in unit door to provide safe access to circuit breakers

while retaing an adequate air seal during operation. (See Fig.

4)

Figure 2 [ Fused Model Installation

DIMPLE 7

F

_ WIRE TIE

(REMOVE ON
LARGE FAN COILS)

Installation oi FIl_ed Model Heater

a. Cut insulation away from access hole in blower access
panel.

b. Remove adhesive backing from rubber window bezel and
from the outside insert into access hole and seat firmly to in-

sure an airtight adhesion to blower panel door surface.
PROCEDURE 3 -ELECTRICAL CONNECTIONS

Refer to unit instructions for recommended wiring proce-
dures. Install wiring in accordance with all applicable local

and national codes.
Connect heater wiring harness plug to receptacle on fan

board or wire harness. A positive connection must be made
between plug and receptacle. Plug will interlock with recep-

tacle when properly seated. Harness contains both 24-v

control and high-voltage wiring. Blower power is provided

through heater harness.

NOTE: Units with or without electric heaters require a mini-
mum CFM. Refer to unit wiring label to ensure the fan speed
selected with electric heaters is equal to or greater than the

minimum fan speed indicated. The minimum CFM for cooling
is determined bythe outdoor unit requirements. Use the high-
er of the 2 for year-round operation.

Figure 3 J Circuit Breaker Model Installation

I I '_ J SHELF

Installation of Circuit Breaker Model Heater

I BLOWER

A. Wire 24-v Control Systems

1. Connections to unit
Use No. 18 AWG color-coded, insulated (35 Deg. C mini-

mum) wire to make low-voltage connections between ther-
mostat, fan coil unit, and outdoor unit. Ifthermostat is located

more than 100 ft. from unit (as measured along the low-volt-
age wire), use No. 16 AWG color-coded, insulated (35 Deg.

C minimum) wire. All wiring must be separated from line volt-
age power leads. Refer to outdoor unit wiring instructions for

additional wiring procedure recommendations.

2. Transformer
Transformer is factory wired for 230-v operation. For 208-v

applications, disconnect black wire on transformer 230-v ter-
minal and reconnect it to 208-v terminal. (See Fig. 5.) The
secondary circuit oftransformer is protected by a 5-amp fuse

mounted on fan board.

3. Heater staging
The units are shipped circuited for single-stage operation.

The heat can be staged either through an indoor thermostat
or by using an outdoor thermostat. When 2-stages are de-

sired, cut W3 at the W2 wire nut, strip and reconnect perwir-
ing staging layout in Installation Instructions for fan coils.

a. The 3-, 5-, 8-, and 10-kw heaters are single stage only.
b. The 9- and 15-kw heaters are adaptable for 2-stage op-

eration.
c. The 18-, 20-, 24-, and 30-kw heaters are adaptable for

3-stage operation.

4. Rectifier and Time Delay Boards
Each heater element is controlled by a relay mounted on the

heater panel. The relay has a 24v DC coil. Each relay has a
small rectifier board attached directly to relay coil terminals.

The rectifier board converts incoming 24v AC control signal
to DC. Some heaters may have up to three relays. The sec-

ond and/or third relay rectifier board also has a time delay
feature and a small jumper wire built into it. With the jumper

uncut, the time delay allows the second stage heat to be en-
ergized approximately 5 seconds after the first stage. On 18,

24, and 30kw heaters, the third stage relay board jumper is
cut at factory. This provides an 8 second delay after first stage

relay closes.

Figure 4 / Window Bezel Installation

i

482 01 2226 01 L_J
May 2003