Circulating Air And Filters; Condensate Drain Connection; Startup, Adjustments, And Checks - Daikin DBC Series Installation Instructions Manual

4. Route thermostat wires from sub-base terminals
to the unit. Control wiring should enter through the
condenser panel opening or through curb indicated in
"Electrical Entrance" figure. Connect thermostat and
any accessory wiring to low voltage terminal block
TB1 in the main control box.
NOTE: Field-supplied conduit may need to be
installed depending on unit/curb configuration.
Use #18 AWG solid conductor wire whenever
connecting thermostat wires to terminals on
sub-base. DO NOT use larger than #18 AWG wire. A
transition to #18 AWG wire may be required before
entering thermostat sub-base.
NOTE: Refer to unit wiring diagrams for
thermostat or remote sensor connections.

CIRCULATING AIR AND FILTERS

Ductwork
The supply duct from the unit through a wall may be
installed without clearance. However, minimum unit
clearances must be maintained (see "Clearances" section).
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

Condensate Drain Connection
A 3/4" female NPT drain connection is supplied on the
end of the unit and bottom of the drain pan for condensate
piping. An external trap must be installed for proper
condensate drainage. Hand tighten drain fitting to the drain
connection.
DRAIN PLUG
(FACTORY-INSTALLED)
Drain Pan (Side View)
Base Rail
Open Vent
NOTE: Trap should be deep enough to offset maximum
unit static difference. A minimum 4" trap is recommended.
Install condensate drain trap as shown. Use 3/4" drain line
and fittings or larger. Do not operate without trap.
Horizontal Drain
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.
Vertical Drain
To use the bottom drain connection, remove the drain plug
from the bottom connection and install it in the horizontal
connection.
Cleaning
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. A non-chlorine cleaning agent must be used.

STARTUP, ADJUSTMENTS, AND CHECKS

HIGH VOLTAGE!
To 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
acceptable means. Disconnect all
power before servicing or installing
this unit.
STANDARD
SIDE DRAIN
10
2" Min
See NOTE
Drain Plug
drain connection
WARNING
Roof Curb