Page 3
Parts Arrangement
General
These installation instructions are intended as a general
guide only, for use by an experienced, qualified contractor.
The Merit
®
Series 13CHA units are single−package electric
units designed for outdoor installation on a rooftop or a
slab. The units are equipped with a transformer and blower
control for applications which do not include electric heat.
Electric heat sections are available for separate order.
The unit must be sized based on heat loss and heat gain
calculations made according to the methods of the Air
Conditioning Contractors of America (ACCA).
The units are shipped assembled. All piping, refrigerant
charge, and electrical wiring are factory−installed and
tested. The units require electric power, condensate drain
and duct connections at the point of 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 re-
moved upon construction completion.
The unit components, duct system, air filters and evap-
orator coil must be thoroughly cleaned following final
construction clean−up.
The unit operating conditions (including airflow, cool-
ing operation, and heating operation) must be verified
according to these installation instructions.
