AG EHK2 Series Installation Instructions

EHK2
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.
WARNING
!
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.
CAUTION
!
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.
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.
Installation Instructions
Electric Heater Packages

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.
WARNING
!
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.

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.