9
CIRCULATING AIR AND FILTERS
D
UCTWORK
The supply duct from the unit through a wall may be installed with-
out clearance. However, minimum unit clearances must be main-
tained (see “Clearances” section). The supply duct should be pro-
vided with an access panel large enough to inspect the air cham-
ber downstream of the heat exchanger. A cover should be tightly
attached to prevent air leaks.
Ductwork dimensions are shown in the roof curb installation
manual.
If desired, supply and return duct connections to the unit may be
made with flexible connections to reduce possible unit operating
sound transmission.
CONDENSATE DRAIN CONNECTION
C
ONDENSATE
D
RAIN
C
ONNECTION
A 1” female NPT drain connection is supplied on the side of the
unit and a 1” male NPT on the bottom of the drain pan for con-
densate piping. An external trap must be installed for proper con-
densate drainage.
UNIT
2" MINIMUM
FLEXIBLE
TUBING-HOSE
OR PIPE
3" MINIMUM
A POSITIVE LIQUID
SEAL IS REQUIRED
DRAIN CONNECTION
Install condensate drain trap as shown. Use 1" drain line and fit-
tings or larger. Do not operate without trap.
H
ORIZONTAL
D
RAIN
Drainage of condensate directly onto the roof may be acceptable;
refer to local code. It is recommended that a small drip pad of
either stone, mortar, wood or metal be provided to prevent any
possible damage to the roof.
C
LEANING
Due to the fact that drain pans in any air conditioning unit
will have some moisture in them, algae and fungus will grow
due to airborne bacteria and spores. Periodic cleaning is
necessary to prevent this build-up from plugging the drain.
STARTUP, ADJUSTMENTS, AND CHECKS
HIGH VOLTAGE!
OND
THE
FRAME
OF
THIS
UNIT
TO
THE
BUILDING
ELECTRICAL
GROUND
BY
USE
OF
THE
GROUNDING
TERMINAL
PROVIDED
OR
OTHER
ACCEPTABLE
MEANS
. D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
OR
INSTALLING
THIS
UNIT
.
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
B
WARNING
P
RE
-S
TARTUP
I
NSTRUCTIONS
T
O
PREVENT
PROPERTY
DAMAGE
OR
PERSONAL
INJURY
, D
O
NOT
START
THE
UNIT
UNTIL
ALL
NECESSARY
PRE
-
CHECKS
AND
TESTS
HAVE
BEEN
PERFORMED
.
CAUTION
Prior to the beginning of Startup, Adjustments, and Checks proce-
dures, the following steps should be completed in the building.
MOVING MACHINERY HAZARD!
T
O
PREVENT
POSSIBLE
PERSONAL
INJURY
OR
DEATH
,
DISCONNECT
POWER
TO
THE
UNIT
AND
PADLOCK
IN
THE
“OFF”
POSITION
BEFORE
SERVICNG
FANS
.
WARNING
H
EATING
S
TARTUP
On new installations, or if a major component has been replaced,
the operation of the unit must be checked.
Check unit operation as outlined in the following instructions. If
any sparking, odors, or unusual sounds are encountered, shut off
electrical power and recheck for wiring errors, or obstructions in
or near the blower motors. Duct covers must be removed before
operating unit.
The Startup, Adjustments, and Checks procedure provides a step-
by-step sequence which, if followed, will assure the proper startup
of the equipment in the minimum amount of time. Air balancing
of duct system is not considered part of this procedure. However,
it is an important phase of any air conditioning system startup and
should be performed upon completion of the Startup, Adjustments,
and Checks procedure. The Startup, Adjustments, and Checks pro-
cedure at outside ambients below 55°F should be limited to a readi-
ness check of the refrigeration system with the required final check
and calibration left to be completed when the outside ambient
rises above 55°F.
