Modine Manufacturing HD Installation And Service Manual - page 4
4
Turning The Unit 180°
All units are produced at the factory with left-side controls, when
looking at the unit. If the installation requires that the controls be
on the right side, the unit heater can be “turned over”. In
addition, the following instructions must be followed:
• By turning the unit 180° from the way it was received from
the factory, the sides become opposite but the front and
back remain in the same relative position. The bottom
panel now becomes the top panel and vise-versa.
• Remove the access panel, turn it 180°, and re-attach it to
the unit. This is important so that all the information labels
can be read.
• Remove the spring loaded deflector blades, turn them over,
replace, and adjust so they are open and in a position to
direct the heated air down to the floor.
Unit Suspension
Be sure the means of suspension is adequate to support the
weight of the unit (see page 14 for unit weights). For proper
operation, the unit must be installed in a level horizontal
position. Clearances to combustibles as specified above must
be strictly maintained.
Before lifting the heater for suspension, the mounting brackets
must be installed. Decide if the unit will be installed as received
from the factory; that is with left-side controls when looking at
the front of the unit.
If so, remove and retain the (3) screws along the top edge of
both the front and back of unit. Align screw holes on mounting
bracket with holes along front and back top edges. Secure (1)
mounting bracket to front of unit with retained screws. Secure
the other mounting bracket to back of unit in a similar way.
If you chose to turn the unit 180° from the way it was received
from the factory, the mounting brackets are attached in a
similar manner after the unit is turned over.
To suspend unit, secure the mounting brackets to the ceiling
joists or truss, using 1/4" screws with 1/2" washers. These 1" -
angle, mounting brackets are slotted to accommodate joists on
16" or 24" centerlines.
This heater can also be hung utilizing the same mounting
brackets and threaded rod. Attach the threaded rod to the unit
mounting brackets, securing with a top and bottom nut.
Next, drill holes into a steel channel or angle iron at the same
centerline dimensions as those chosen for the heater that is
being installed. The steel channels or angle iron pieces need to
span and be fastened to appropriate structural members. Cut
the threaded rods to the preferred length, push them through
the holes in the steel channel or angle iron and secure with
washers and lock nuts, lock washers and nuts, or a double nut
arrangement like used on the unit heater mounting brackets.
Finally, the HD gas-fired unit heater can also be installed on a
shelf, if so desired. The mounting brackets will need to be
attached to the heater the same manner as explained earlier,
however, to mount on a shelf the brackets must go on the
bottom of the heater. The brackets must be affixed to the shelf
using similar screws (1/4" screw with 1/2" washer) as overhead
joist or truss mounting. Be sure all clearance to combustible
requirements are met.
Venting
Before you start use the following steps to verify that
the venting system is adequately sized:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code ANSI
Z223.1 or CAN/CGA B149.1 or .2 Installation Code-latest
edition and these instructions. Determine that there is no
blockage or restriction, leakage, corrosion and other
deficiencies, which could cause an unsafe condition.
3. In so far as practical, close all building doors and windows
and all doors between the space in which the appliance(s)
connected to the venting system are located and other
spaces of the building. Turn on clothes dryers and any
exhaust fans such as range hoods and bathroom exhausts,
so they shall operate at maximum speed. Do not operate a
summer exhaust fan. Close fireplace dampers.
4. Follow the lighting instructions. Place the appliance being
inspected in operation. Adjust thermostat so that the
appliance will operate continuously.
CAUTION
Do not install units below 7' measured from the bottom of the
unit to the floor in commercial applications and 5' measured
from the bottom of the unit to the floor in residential
applications.
Do not locate unit closer to combustible materials than the
clearances listed. They are:
Top and Bottom
1"
Vent Connector
4"
Access Side
18"
Non-Access Side
1"
Rear
18"
Be sure no obstructions block air intake and discharge of
unit heaters.
!
CAUTION
The minimum distance from combustible material is based
on the combustible material surface not exceeding 160° F.
Clearance from the top of the unit may be required to be
greater than the minimum specified if heat damage, other
than fire, may occur to materials above the unit heater at the
temperature described.
Allow 18" clearance at rear (or 6" beyond end of motor at rear
of unit, whichever is greater) and access side to provide
ample air for combustion and proper operation of fan.
!
INSTALLATION
CAUTION
All units must be vented to the outside atmosphere.
A built-in power exhauster is provided - additional external
draft hoods (diverters) or power exhausters are not required
or permitted.
Installation must conform with local building codes or in the
absence of local codes, with Part 7, Venting of Equipment, of
the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) - latest
edition. In Canada installation must be in accordance with
CAN/CGA-B149.1 for natural gas units, and CAN/CGA-
B149.2 for propane units.
!
WARNING
If you are replacing an existing heater, it may necessary to
resize the venting systems. Improperly sized venting
systems can result in vent gas leakage or the formation of
condensate. Refer to the National Fuel Gas Code ANSI
Z223.1 or CAN/CGA B149.1 or .2 latest edition. Failure to
follow these instructions can result in serious injury or death.
This heater is equipped with a power exhaust system. DO
NOT use any additional power exhaust systems or vent
dampers. FAILURE TO FOLLOW THESE INSTRUCTIONS
could result in serious injury or death.
!