3
AIR11-500.6
INSTALLATION - UNIT MOUNTING / PIPING / ELECTRICAL CONNECTIONS
INSTALLATION
Unit Mounting
1. Open front panel and line up end compartment with roughed-
in piping and position unit at ceiling or wall location. (Hinged
cabinet doors may be removed to facilitate unit installation.)
2. Fasten floor or wall mounted unit to wall studs through
the four mounting holes in the back of the unit. For ceiling
mounted units sizes 002-006, suspend four 1/4" threaded
hanger studs from ceiling joists to match mounting holes in
back of unit and fasten with lockwashers and hex nuts. (For
sizes 008-014, use a 3/8" threaded rod.)
Perma-Lap
®
Frames
A Perma-Lap
®
frame (see Figure 11.3 on page 10) provides
a finished appearance to a recessed wall or ceiling cabinet
unit heater. The installation is easy and assures a perfect fit
by neatly framing the heater and covering any irregularities
between the heater and the opening in the wall or ceiling.
Because the bond between wall or ceiling surfaces and the
Perma-Lap® framing is permanent, there is no opportunity for
air leakage which can cause wall streaking.
Since the enclosure front panel is never in contact with the wall
or ceiling, servicing the heater involves simply removing the
heater front panel and leaving the Perma-Lap® and cabinet
enclosure permanently fixed in the recess opening.
Perma-Lap
®
frames allow flexibility in recessing depth. Enclosures
may be flush, recessed or partially recessed. Desired unit projection
on partially recessed units is accomplished by positioning the unit
within the Perma-Lap
®
frame. The four sided Perma-Lap® frame
has a 3/8” projection and a 1 ½” width.
Piping
1. On standard coil (single row), connections are 3/4" MPT on
unit sizes 002 through 006.
On high capacity coil (2 row), connections are 5/8" ID sweat
on unit sizes 002 through 006. On high capacity coil (3 & 4
row), connections are 3/4" NPT on unit sizes 002 through 006.
On unit sizes 008 through 014, either standard or high capacity
coil, connections are 1" NPT. On high capacity coil (3 & 4 row),
connections are 1" NPT on unit sizes 008 through 014.
2. Supply and return lines should be adequately sized to handle
heating requirements under maximum load.
3. Attach air vent fitting at the high point of the piping in the unit
on hot water systems.
4. Install piping to provide for expansion and contraction
normally encountered with temperature changes.
Electrical Connections
1. Installation of wiring must conform with local building
codes, or in the absence of local codes, with the National
Electric Code ANSI/NFPA 70 - Latest Edition. Unit must
be electrically grounded in conformance to this code. In
Canada, wiring must comply with CSA C22.1, Electrical
Code.
2. Electric wiring must be sized to carry the full load amp draw
of the motor and any controls that are used with the unit
heater. Overcurrent protectors should be sized based on
motor current rating shown on the unit serial plate, and
applicable national electric code procedures.
All units are provided with an electrical junction box. Make
wiring connections from 115V/60Hz/1Ø building service to
control box as shown on wiring diagram furnished with the
unit.
Any damage to or failure of Modine units caused by
incorrect wiring of the units is not covered by Modine’s
standard warranty.
3. Location of room thermostat, when supplied, should be in
the natural circulating path of room air. Mount thermostat
about five feet above floor level where it will not be affected
by heat from the unit or other sources of drafts that would
prevent it from properly controlling room temperature. See
instructions packed with the thermostat.
4. With ceiling mounted units, a multi-speed remote fan
switch is supplied as standard. The switch can be recessed
into a standard 2 x 4 electrical wall box.
Failure to wire this unit according to this wiring diagram may
result in injury to the installer or user. For deviations, contact
the factory.
CAUTION
Figure 3.1
Standard Wiring Diagram for Cabinet Unit Heaters
CAUTION
1. Do not reuse any electrical component which has been
wet. Such component must be replaced.
2. Do not operate the units within steam pressure greater
than 10 psig. Steam pressure must be 10 psig. or lower
to avoid excessive discharge air temperatures that could
cause burns or personal injury.
WARNING
1. Disconnect power supply before making wiring connections
to prevent electrical shock and equipment damage.
2. All appliances must be wired strictly in accordance with
wiring diagram furnished with the appliance. Any wiring
different from the wiring diagram could result in a hazard to
persons and property.
3. Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature
rating of at least 105°C.
16 AWG
16 AWG
L1
L2
MAIN
GROUND
Factory Installed Disconnect Option or
1
2
AQUASTAT
ACCESSORY
MOTOR
STARTER
4
3
REQUIRED FOR
SIZES 008 - 014
ACCESSORY
F1
F2
SPEED
CONTROL
FIELD INSTALLED
CONTROL VALVE
(ACCESSORY OR
BY OTHERS)
FIELD INSTALLED
THERMOSTAT
WHT
BLK
WHT
BLK
MOUNT INSIDE J-BOX
OPTIONAL MOTOR PLUG
AND SOCKET CONNECTIONS
Rated Amps
2.5 A
5.0 A
RED
BLK
Terminal 3 Terminal 4
WHT
RED
GRN
Ground
10.0 A
BLK
WHT
Motor Type
Shaded Pole
PSC
High Static
See Below Motor Key For Motor
Information and Wiring Configuration
Ground
N / A
N / A
FIELD INSTALLED
MOTORIZED DAMPER
(ACCESSORY)
Motorized Damper Option or
Factory Installed
Return Air Option or
115V / 60HZ /
1PH POWER
CIRCUIT
BREAKER
BY OTHERS
FIELD INSTALLED
DISCONNECT
