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506393−01 11/2010
WARNING
Electric shock hazard and danger of
explosion. Can cause injury, death or
product or property damage. Turn off
gas and electrical power to unit before
performing any maintenance or
servicing operations on the unit. Follow
lighting instructions attached to unit
when putting unit back into operation
and after service or maintenance.
NOTICE
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil, causing the
rubber to swell. Bubbles in the rubber roofing
material can cause leaks. Protect the roof surface
to avoid exposure to refrigerant and oil during
service and installation. Failure to follow this notice
could result in damage to roof surface.
The KHA unit is ETL/CSA certified as a heat pump with
cooling and with or without auxiliary electric heat for
non−residential use only at the clearances to combustible
materials as listed on the unit nameplate and in figure 1.
Installation of ETL/CSA certified units must conform with
current standard C273.5 Installation Requirements for
Heat Pumps" and applicable local codes. Authorities
having jurisdiction should be consulted before
installation.
Use of this unit as a construction heater or air conditioner
is not recommended during any phase of construction.
Very low return air temperatures, harmful vapors and
operation of the unit with clogged or misplaced filters will
damage the unit.
If this unit has been used for heating or cooling of
buildings or structures under construction, the following
conditions must be met or the warranty will be void:
A room thermostat must control the unit. The use of
fixed jumpers that will provide continuous heating or
cooling is not allowed.
A pre−filter must be installed at the entry to the return
air duct.
The return air duct must be provided and sealed to
the unit.
Return air temperature range between 55°F (13°C)
and 80°F (27°C) must be maintained.
Air filters must be replaced and pre−filter must be
removed upon construction completion.
The unit components, duct system, air filters and
evaporator coil must be thoroughly cleaned following
final construction clean−up.
The unit operating conditions (including airflow,
cooling operation, and heating operation) must be
verified according to these installation instructions.
IMPORTANT
The Clean Air Act of 1990 bans the intentional vent-
ing of refrigerant (CFC’s and HCFC’s) as of July 1,
1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incar-
ceration may be levied for non−compliance.
Unit Support
NOTE − Securely fasten roof frame to roof per local codes.
A−Downflow Discharge Application
Roof Mounting with LARMF18/36
1− The LARMF18/36 roof mounting frame must be
installed, flashed and sealed in accordance with the
instructions provided with the frame.
2− The LARMF18/36 roof mounting frame should be
square and level to 1/16" per linear foot (5mm per
linear meter) in any direction.
3− Duct must be attached to the roof mounting frame
and not to the KHA unit; supply and return plenums
must be installed before setting the unit.
4− Trim and discard any pieces of exposed insulation which
extend past the edges of the roof mounting frame.
Installer’s Roof Mounting Frame
Many types of roof frames can be used to install the KHA
unit, depending upon different roof structures. Items to
keep in mind when using the building frame or supports
are:
1− The KHA base is fully enclosed and insulated, so an
enclosed frame is not required.
2− The frames or supports must be constructed with
non−combustible materials and should be square and
level to 1/16" per linear foot (5mm per linear meter)
in any direction.
3− Frame or supports must be high enough to prevent any
form of moisture from entering unit. Recommended
minimum frame height is 14" (356mm).
4− Duct must be attached to the roof mounting frame
and not to the KHA unit. Supply and return plenums
must be installed before setting the unit.
5− Units require support along all four sides of unit base.
Supports must be constructed of steel or suitably
treated wood materials.
NOTE−When installing an KHA unit on a combustible
surface for downflow discharge applications, the
LARMF18/36 roof mounting frame is required.
