Circulating Air And Filters; Condensate Drain Connection - Daikin DFC Series Installation Instructions Manual

Low Voltage Control Wiring
1. A 24V thermostat must be installed for unit operation.
2. Locate thermostat or remote sensor in the conditioned
space where it will sense average temperature. Do
not locate the device where it may be directly exposed
to supply air, sunlight or other sources of heat. Follow
installation instructions packaged with the thermostat.
3. Use #18 AWG wire for 24V control wiring runs not
exceeding 75 feet. Use #16 AWG wire for 24V control
wiring runs not exceeding 125 feet. Use #14 AWG
wire for 24V control wiring runs not exceeding 200
feet. Low voltage wiring may be National Electrical
Code (NEC) Class 2 where permitted by local codes.
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 and Thru Curb" Figure 8B.
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
2" Min
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 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.
NOTE: All threaded connections use pipe sealer.
Cleaning
Due to the fact that the 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 the build-up from plugging
the drain.
To remove the drain pan for cleaning, remove the drain pan
cover first (located on duct panel) then the drain pan could
be slid out.
10
Figure 9
See NOTE
Drain Plug
Figure 10
STANDARD
SIDE DRAIN
Roof Curb