AG EHK2 Series User manual

EHK2
Installation Instructions
Electric Heater Packages
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS
Installing and servicing of heating and air conditioning equipment
can be hazardous due to system pressures and electrical
components. Only trained personnel should install or service
heating and air conditioning equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning coils, or cleaning and replacing filters. All other
operations should be performed by trained personnel. When
working on heating and air conditioning equipment, observe
precautions in literature, on tags, and on labels attached to the unit.
Follow all safety codes. Wear safety glasses and work gloves. Have
a fire extinguisher available.
Recognize safety information. This is the safety--alert symbol .
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety--alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing, modifying or servicing system, always turn
off main power to system. There may be more than one
disconnect switch. Lock out and tag switch with a suitable
warning label.
!
WARNING
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when
handling parts.
CAUTION
!
INSTALLATION
This instruction describes the installation of Part No. EHK2
accessory heaters in FFM, FMA, WAMA and WAXA fan coils.
NOTE: Electric heaters require a minimum airflow. Minimum
airflow and motor speed selection are listed in Table 2.
Install Electric Heater Assembly
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.
3. Remove the plate covering the opening at the back of the
top compartment.
4. Insert heater assembly into the opening, coils first. Ensure
the arrow stamped into the heater plate is orientated up to
correspond with the airflow direction. Use care not to dam-
age the coils during insertion.
5. Use the previously removed cover--plate screws to secure
the heater assembly. (See Fig. 1) Discard cover plate.
Attach Circuit Breaker Box
1. Snap the circuit breaker onto the circuit breaker bracket.
2. Install the breaker assembly using the mounting holes in the
top compartment.
3. Secure using provided screws.
4. Disconnect and discard the factory--installed high voltage
wiring harness.
5. Connect the heater assembly wiring harness to the unit--
wiring connector.
6. Use wire ties to secure wires away from sharp edges.
7. Apply the supplemental wiring diagram provided with the
heater kit over the existing wiring diagram on the fan coil.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Ensure fuse box is closed before power is turned to ON
position. There may be more than one power supply.
!
WARNING
ELECTRICAL CONNECTIONS
Refer to unit instructions for recommended wiring procedures.
Install wiring in accordance with all applicable local and national
codes. (See Table 5.) Connect heater wiring harness plug to
receptacle on fan--coil wire harness. A positive connection must be
made between plug and receptacle. Plug will interlock with
receptacle when properly seated. Harness contains both 24V
control and high--voltage wiring. Blower power is provided
through heater harness.
Power Connections
NOTE: Heater supply circuit wire size and overcurrent protection
must comply with National Electrical Code (NEC) and UL branch
circuit requirements. (See Table 5) Wires and overcurrent
protection, integral to the heater, are not required to meet branch
circuit requirements. Internal circuit protection of 60 amps
(maximum) is acceptable.

2
The 5--kW through 10--kW circuit breaker heaters can be wired for
single--supply circuit only.
Table 1 – Accessory Heater Usage
ELECTRIC HEATER PART NUMBER SIZES USED WITH kW INTERNAL CIRCUIT PROTECTION
EHK205B 18-37 5Circuit Breaker
EHK208B 18-37 7.5 Circuit Breaker
EHK210B 18-37 10 Circuit Breaker
Table 2 – Minimum CFM
Fan Coil Unit Size EHK2-05B EHK2-08B EHK2-10B
18, 19 325 350 375
24, 25 450 475 500
30, 31 575 600 625
36, 37 700 725 750
Heater
assembly
locations
Breaker box
locations
Unit sizes 18-25 Unit sizes 31-37
(Top View) (Top View)
(Front View) (Front View)
A13365
Fig. 1 -- Installation Locations for EHK2 Heaters
Ground
Lu
g
Field
Power
Wiring
Field
Ground
Wiring
ON
OFF
L1
L2
A00077
Fig. 2 -- 5--kW, 7.5--kW, 10--kW Circuit Breaker
and Disconnect Heaters
NOTE: Use UL--listed conduit and conduit connector for
connecting supply wire(s) to unit to obtain proper grounding. If
conduit connection uses reducing washers, a separate ground wire
must be used. Grounding may also be accomplished by using
grounding lugs provided in control box.
Ground Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
According to NEC, ANSI/NFPA 70, and local codes, cabinet
must have an uninterrupted or unbroken ground to minimize
personal injury if an electrical fault should occur. The ground
may consist of electrical wire or metal conduit when installed
in accordance with existing electrical codes. (See
Ground/Conduit Note below.)
!
WARNING

3
Fan Speeds
Before operating unit, be sure that the proper blower speed has
been selected. Fan speeds are selected manually. (See Table 3)
NOTE: The low fan speed tap should not be used for
simultaneous heat pump and electric heat applications. Always
ensure the minimum CFM shown in Table 2 is met.
To change the fan speed on fan coils with PSC motors:
The factory default is medium speed. To select the desired fan
speed for cooling, simultaneous heat pump and electric heat
operation, and anytime a “G” signal is present; connect the desired
fan motor speed tap wire to Fan Relay Terminal No. 4.
To select the desired fan speed for heating operation, anytime the
“G” signal is not present; connect the desired fan motor speed tap
wire to Fan Relay Terminal No. 6.
Always connect the unused fan--motor wire to the dummy terminal
block. The factory default for electric heat only operation is low
speed.
Table 3 – Color Code for PSC Motor Lead Wires
MOTOR SPEED TAP WIRE COLOR
Common Purple
High Black
Medium Red
Low Blue
To change the fan speed on fan coils equipped with multi--tap
ECM motors:
Fan speeds are selected manually (See Table 4). At the motor
connection plug (See Fig. 3) connect the green wire to the desired
motor tap number indicated on the motor plug. For the electric heat
fan speed selection connect the white wire to the desired motor tap
number indicated on the motor plug.
1 2 3 4 5
Speed Taps may be located on motor,
or on plug close to motor.
CLGN
1 2 3 4 5
A11048
Fig. 3 -- ECM Motor Speed Taps
Table 4 – ECM Motor Speed Taps
Ta p
D e l a y ---
off
Time (s)
19 25 31 37
Tap 1 30 --- --- --- ---
Tap 2 90 Default --- Default ---
Tap 3 30 --- --- --- ---
Tap 4 90 --- Default --- Default
Tap 5 30 --- --- --- ---
*The defaults shown are for cooling and simultaneous heat---pump / electric---
heat operation.
Transformer
All units are shipped from factory wired for 240VAC transformer
operation. For 208VAC operation, move primary lead from
240VAC terminal to 208VAC terminal, see Fig. 4.
240
COM
208
BLK
YEL
BLK
RED
SECONDARY
PRIMARY
A13092
Fig. 4 -- Connection of Transformer
VERIFY INSTALLATION
After completion of heater installation, check wiring to ensure
tightness and that proper connections and routings have been
made. Ensure all electrical covers are in place. Reinstall blower
access panel before turning unit power on.

4
Table 5 – Electric Heater Electrical Data for PSC Motor Units
Heat
Kit
Model
Used
on
Size
Nominal
Heat
Capacity
@ 240V
Ship-
ping
Weight
Heater
Capacity
(MBH)
Minimum
Circuit
Ampacity
(MCA)
MAX. Fuse
or Breaker
H e a t --- K i t
Ampacity
(HACR)
Min Wire
Size
(AWG) ††
Min Ground
Wire Size
Max Wire
Length (Ft)
‡‡
KW lbs. (kg) 208 240 208 240 208 240 208 240 208 240 208 240
EHK205B 1 --- 1 / 2
Ton
5
5.1 (2.3)
12.3 16.4 23.6 27.1 30 30 10 10 10 10 73 74
EHK208B 7.5 22.2 25.6 34.9 40.1 50 50 8 8 10 10 76 77
EHK210B 10 24.6 32.8 46.2 53.1 60 60 6 6 10 10 92 92
EHK205B
2
Ton
5
5.1 (2.3)
12.3 16.4 23.9 27.3 30 30 10 10 10 10 73 73
EHK208B 7.5 22.2 25.6 35.2 40.4 50 50 8 8 10 10 76 76
EHK210B 10 24.6 32.8 46.4 53.4 60 60 6 6 10 10 91 92
EHK205B
2 --- 1 / 2
Ton
5
5.1 (2.3)
12.3 16.4 24.2 27.7 30 30 10 10 10 10 72 72
EHK208B 7.5 22.2 25.6 35.5 40.7 50 50 8 8 10 10 75 76
EHK210B 10 24.6 32.8 46.8 53.7 60 60 6 6 10 10 91 91
EHK205B
3
Ton
5
5.1 (2.3)
12.3 16.4 24.9 28.3 30 30 10 10 10 10 70 71
EHK208B 7.5 22.2 25.6 36.2 41.4 50 50 8 8 10 10 74 74
EHK210B 10 24.6 32.8 47.4 54.4 60 60 6 6 10 10 90 90
* †† Copper wire must be used. If other than uncoated (non---plated), 75_C ambient, copper wire (solid wire for 10 AWG and smaller, stranded wire for larger
than 10 AWG) is used, consult applicable tables of the National electric Code (ANSI/NGPA 70).
* ‡‡ Length shown is as measured 1 way along wire path between unit and service panel for a voltage drop not to exceed 2%.
Table 6 – Electric Heater Electrical Data for ECM Motor Units
Heat
Kit
Model
Used
on
Size
Nominal
Heat
Capacity
@ 240V
Ship-
ping
Weight
Heater
Capacity
(MBH)
Minimum
Circuit
Ampacity
(MCA)
MAX. Fuse
or Breaker
H e a t --- K i t
Ampacity
(HACR)
Min Wire
Size
(AWG) ††
Min Ground
Wire Size
Max Wire
Length (Ft)
‡‡
KW lbs. (kg) 208 240 208 240 208 240 208 240 208 240 208 240
EHK205B
1 --- 1 / 2
Ton
5
5.1 (2.3)
12.3 16.4 25 28.5 30 30 10 10 10 10 69 70
EHK208B 7.5 22.2 25.6 36.3 41.5 50 50 8 8 10 10 73 74
EHK210B 10 24.6 32.8 47.6 54.5 60 60 6 6 10 10 89 90
EHK205B
2
Ton
5
5.1 (2.3)
12.3 16.4 25 28.5 30 30 10 10 10 10 69 70
EHK208B 7.5 22.2 25.6 36.3 41.5 50 50 8 8 10 10 73 74
EHK210B 10 24.6 32.8 47.6 54.5 60 60 6 6 10 10 89 90
EHK205B
2 --- 1 / 2
Ton
5
5.1 (2.3)
12.3 16.4 26 29.5 30 30 10 10 10 10 67 68
EHK208B 7.5 22.2 25.6 37.3 42.5 50 50 8 8 10 10 71 72
EHK210B 10 24.6 32.8 48.6 55.5 60 60 6 6 10 10 87 88
EHK205B
3
Ton
5
5.1 (2.3)
12.3 16.4 26 29.5 30 30 10 10 10 10 67 68
EHK208B 7.5 22.2 25.6 37.3 42.5 50 50 8 8 10 10 71 72
EHK210B 10 24.6 32.8 48.6 55.5 60 60 6 6 10 10 87 88
* †† Copper wire must be used. If other than uncoated (non---plated), 75_C ambient, copper wire (solid wire for 10 AWG and smaller, stranded wire for larger
than 10 AWG) is used, consult applicable tables of the National electric Code (ANSI/NGPA 70).
* ‡‡ Length shown is as measured 1 way along wire path between unit and service panel for a voltage drop not to exceed 2%.
Copyright 2019 CAC / BDP / ICP D7310 W. Morris St. DIndianapolis, IN 46231 Edition Date: 01/19
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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