Enertech XT024, Руководство по установке и эксплуатации, Страница: 34 / 56

34
Enertech Global IOM, XT Models
NOTE: Supply voltage, amperage, fuse and
disconnect switch sizes MUST conform with all
technical specifications in this manual and on the
unit rating plate.
1. Permanently ground the electric heat accessory
in accordance with local codes and ordinances
and in the United States with National Electrical
Code ANSI/NFPA70-2008 or current edition.
Use a copper conductor of the appropriate
size from the electric heat accessory ground
lug, to a grounding lug on the circuit breaker
panel. On models with more than one circuit,
a separate copper ground wire MUST be
connected for each circuit. Install top front door
panel.
2. The time delay module stages the heater
elements for 15kW and 20kW heaters. In most
cases, the time adjustment knob should be
turned all the way to the right, providng
approximately 10 minutes of delay between the
first and second stage of electric heat.
3. Airflow requirements are different between
models. Please refer to the unit Installation
Instructions for airflow set-up information.
4. Temperature rise is the difference between
the supply and return air temperatures.
NOTE: The maximum outlet air temperature for all
models is 200 Degrees F (93.3 Degree C).
NOTE: Supply voltage, amperage, fuse and
disconnect switch sizes MUST conform with all
technical specifications in this manual and on the
unit rating plate.
⚠
WARNING
⚠
ELECTRICAL SHOCK HAZARD
THE UNIT 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 WITH EXISTING
ELECTRICAL CODES.
Section 7: Auxiliary Heater Installation
Heater Installation
1. Shut OFF electrical power at unit disconnect
switch or service panel.
2. Remove the upper front panel from unit. Locate
and remove the blank filler plate from the
internal discharge plenum.
3. If unit is going to be used for right hand return
the circuit breakers will have to be removed
and rotated 180 degrees, so the OFF position
will be DOWN when the cabinet is positioned
on the right side. This is an NEC requirement. DO
ONE BREAKER AT A TIME to make sure wires are
reconnected properly. Loosen terminal screws
on the wires. Gently pull wires back from breaker.
Remove screws securing the breaker and
rotate 180 degrees, then reconnect the wires to
breaker. Proper torque for terminal screws is 35
inch pounds.
4. Insert the heater into the cabinet opening as
shown in Figure 1. YT models do not have the
back side plenum bracket previously used on
XT and CT models. Exercise caution to prevent
damage to heater element.
5. Secure the electric heat accessory with
four screws.
6. Connect the 6-Pin heater wiring harness to
the receptacle located inside the cabinet
(Top Cover). A perfect match and positive
connection must be made between the plug
and receptacle. The plug will interlock with
receptacle when properly seated. Harness
contains 24 Volts wiring.
7. Route unit power supply through knockout in top
of unit and connect to line side of disconnect.
Connect ground wire to ground lug. See wiring
diagram label to make connections. All line
voltage connections and ground connections
MUST be made with copper wire. The power
supply wiring MUST have overcurrent protection.
This can be either fuses or circuit breakers. The
maximum size for the overcurrent protection is
shown in the column labeled “Max. Fuse or NEC
HACR Breaker (Amps)” in the electrical Data
Table or on the unit rating plate. Connect supply
voltage wires to the Circuit Breakers on the
heater or to the terminal block on the heater.