First Co DFCH Ductless Fan Coil Upflow / Horizontal Heat Pump or DX - 1.5 to 2.5 tons - Manual (Page 3)

CONDENSATE DRAIN LINE
2) Install a rigid (copper) drain line connected to the drain pan
nipple (5/8" OD) and extending out the rear of the cabinet.
This line must be sloping down slightly from the drain pan to
the rear of the cabinet.
3) The rigid drain line should drain directly outdoors or connect
to an open drain trap. An open drain trap is required to
prevent any possible sewer gas from entering the fan coil unit
through the drain line.
It is also necessary to have adequate slope in the drain line
from the fan coil unit to the open trap or outdoors to ensure
proper drainage.
Warning: The condensate pan will overflow if drain line
is higher than drain pan at any point.
4) A condensate pump must be installed if the drain line is to be
run above the drain pan elevation. The pump must be
located external to the fan coil unit and lower than the drain
pan in order to operate properly. (See condensate pump
installation instructions.)
Drain line installation must adhere to all code requirements.
Wall or Floor Mount (Vertical)
Figure 1 shows the location of the condensate knockouts.
Install a rigid (copper) drain line connected to the drain pan
nipple (5/8" OD). The condensate line should drain directly
outdoors or connect to an open drain trap. An open drain trap
is required to prevent any possible sewer gas from entering the
fan coil unit through the drain tube.
It is also necessary to have adequate slope in the drain line
from the fan coil unit to the open trap or outdoors to ensure
proper drainage.
Ceiling Mount (Horizontal)
Figure 2 shows the location of the condensate knockouts.
The following requirements should be met to insure proper
drainage of condensate from the pan in the horizontal position:
1) Fan coil must be installed level.
ELECTRICAL
All wiring must comply with local and national code require-
ments. Units are provided with wiring diagrams, located on
electrical compartment panel, and nameplate data to provide
information required for necessary field wiring. A 7/8" AND 1-1/
8" knockout is provided as entry points for field wiring. Refer to
figure 1 and 2. If 1-1/8" knockout is used install snap bushing in
hole and route flex conduit through snap bushing to 7/8" hole in
electrical box and secure.
These units are provided with a Class 2 transformer for 24-volt
control circuits. Should any add-on equipment used also have
a Class 2 transformer furnished, care must be taken to prevent
interconnecting outputs of the two transformers by using a
thermostat with isolating contacts.
REFRIGERANT PIPING
Upon completion of refrigerant connections check all connec-
tions for leaks. In addition the suction line must be fully insulated
to prevent sweating of refrigerant line within the unit. A length of
Armaflex insulating tape has been shipped with the unit for this
propose.
Reinstall drain pan to original position.
Entry points for the refrigerant lines are shown in Figure 1 and
2. These lines must be sized in accordance with the outdoor unit
manufacturer’s recommendations. The evaporator coil is fac-
tory supplied for sweat connections on the liquid and suction
lines. A short preformed 90 degree copper elbow is also factory
supplied to facilitate the connection to the suction line at the
evaporator.
To ease the installation of the refrigerant lines to the evapora-
tor, remove the drain pan by sliding it out of the fan coil unit.
REFRIGERANT CHARGING
Refer to outdoor manufacturer installation instructions for initial
charging instructions. Even though the outdoor unit is factory
precharged, the charge must be checked and adjusted if re-
quired.
Allow sufficient running time in the cooling cycle, 20 to 30
minutes, for system to balance. At this time you must check the
sub-cooling of the liquid refrigerant at the outdoor unit to insure
a proper liquid seal is present at the expansion valve.
At outdoor conditions between 80 to 95 degrees the system
should be charged to a sub-cooling level of 8 to 10 degrees at
the outdoor unit. This charge will permit the expansion valve to
operate properly at a superheat level of 6 to 8 degrees. Super-
heat at the outdoor unit will be in the range of 12 to 18 degrees.
To increase sub-cooling increase refrigerant charge.
To decrease sub-cooling decrease refrigerant charge.