Daikin DCH048 Series Service Instructions Manual page 106

SYSTEM OPERATION
CIRCULATING AIR AND FILTERS
D
UCTWORK
The supply duct should be provided with an access panel
large enough to inspect the air chamber 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 D C
ONDENSATE RAIN 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
condensate piping. An external trap must be installed for
proper condensate drainage.
Base Rail
Open Vent
2" Min
Drain Plug
NOTE: Trap should be deep enough to offset maximum
unit static difference. A minimum 4" trap is recommended.
Drain Connection
Install condensate drain trap as shown. Use 1" drain line and
fittings or larger. Do not operate without trap.
H D
ORIZONTAL RAIN
Drainage of condensate directly onto the roof may be accept-
able; 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
See NOTE
Roof Curb
to airborne bacteria and spores. Periodic cleaning is neces-
sary to prevent this build-up from plugging the drain.
STARTUP, ADJUSTMENTS, AND CHECKS
HIGH VOLTAGE!
T
O AVOID PERSONAL INJURY OR DEATH DUE TO
,
ELECTRICAL SHOCK BOND THE FRAME OF THIS UNIT TO
THE BUILDING ELECTRICAL GROUND BY USE OF THE
GROUNDING TERMINAL PROVIDED OR OTHER
. D
ACCEPTABLE MEANS ISCONNECT ALL POWER BEFORE
SERVICING OR INSTALLING THIS UNIT
T
O PREVENT PROPERTY DAMAGE OR PERSONAL INJURY
THE UNIT UNTIL ALL NECESSARY PRE
.
PERFORMED
MOVING MACHINERY HAZARD!
T
O PREVENT POSSIBLE PERSONAL INJURY OR DEATH
POWER TO THE UNIT AND PADLOCK IN THE
.
SERVICING FANS
C R
ONTRACTOR ESPONSIBILITY
The installing contractor must be certain that:
• All supply and return air ductwork is in place, properly
sealed, and corresponds with installation instructions.
• All thermostats are mounted and wired in accordance
with installation instructions.
• All electric power, all gas, hot water or steam line
connections, and the condensate drain installation
have been made to each unit on the job. These main
supply lines must be functional and capable of operat-
ing all units simultaneously.
• Requirements are met for venting and combution air.
• Air filters are in place.
• Input rate and temperature rise are adjusted per rating
plate.
• Return air temperature is maintained between 55°F
(13°C) and 80°F (27°C).
R C I
OOF URB NSTALLATION
Inspect the roof curb for correct installation. The unit and curb
assembly should be level. Inspect the flashing of the roof
mounting curb to the roof, especially at the corners, for good
WARNING
.
CAUTION
, D
O NOT START
-
CHECKS AND TEST HAVE BEEN
WARNING
,
DISCONNECT
"OFF"
POSITION BEFORE
C
HECK
11