18-GE08D1-2
5
Installer’s Guide
e. It is always recommended that an auxiliary drain
pan be installed under a horizontal air handler (See
Condensate Drain Piping) to prevent possible
damage to ceilings.
f. Isolate the auxiliary drain pan from the unit or
from the structure.
g. Connect the auxiliary drain line to a separate drain
line (no trap is needed in this line) and terminate
according to local codes.
h. If a return duct is connected to the Air Handler,
it must be the same dimensions as the return
opening shown in the outline drawings.
C. DUCT CONNECTIONS
The supply and return air ducts should be connected to
the unit with flame retardant duct connectors.
Convertible duct flanges are provided on the discharge
opening to provide a “flush fit” for 3/4" or 1-1/2" duct board
applications. See the Outline drawing on page 9 for sizes
of the duct connections. After the duct is secured, seal
around the supply duct to prevent air leakage.
NOTE:
If the convertible duct flanges are not used, they must be
removed and discarded for proper airflow.
D. REFRIGERANT PIPING
IMPORTANT:
Refrigerant piping must be routed to maintain service access
to blower compartment and provide easy removal of filter
access panel and filter.
1. Refrigerant connections are made outside the
cabinet.
NOTE:
TXV bulb MUST be protected (wrapped with wet rag) or
removed, while brazing the tubing. Overheating of the
sensing bulb will affect the functional characteristics and
performance of the air handler.
2. Installation of refrigerant lines is covered in the
installation instructions packaged with the outdoor
unit. Evacuation, leak testing and brazing procedures
are included in those instructions. Read those instruc-
tions before starting installation of refrigerant lines.
NOTE:
Torque specification for TXV equals 1/6 turn past finger
tight.
BRAZING TO EVAPORATOR SECTION
NOTE:
A brazing shield is provided in the information pack
accompanying this unit. This shield fits over the refriger-
ant fittings while brazing. Wet the shield before brazing.
See Figure 5.
IMPORTANT:
Do not unseal refrigerant tubing until ready to cut and fit
refrigerant lines.
1. Remove the sealing caps from indoor coil field
connections.
2. Field supplied tubing should be cut square, round and
free of burrs at the connecting end. Clean the tubing
to prevent contaminants from entering the system.
3. Run refrigerant tubing into the stub sockets of
indoor unit coil.
4. Braze and evacuate according to indoor and outdoor
installation instructions.
PAINTED AREAS OF UNIT MUST BE SHIELDED
DURING BRAZING.
E. CONDENSATE DRAIN PIPING
NOTE:
Make certain that the unit has been installed in a level
position to ensure proper draining.
The indoor blower is downstream of the evaporator coil
which creates a negative pressure at the condensate
drain connections during operation. The condensate
drain connections in front of the indoor coil are 3/4"
NPT. The lower connection is the primary drain. See
Figure 6.
Two secondary drain connections are provided for the
different orientations (See Figure 6). The lower of the
two should be connected as a backup to prevent conden-
sate overflow by a blocked primary drain.
For proper drainage of condensate, the following steps
should be followed:
1. The primary drain line must be trapped with a mini-
mum of 2" water seal as shown in Figures 7 & 8.
Do
not use preformed 3/4" PVC running traps.
