DX CONNECTION STEPS
In the field:
1. Purge the system by pressing the Schrader valve.
2. Heat the soft solder and remove the Schrader
valve and flare.
3. Attach thermal expansion valve (TXV) to dis-
tributor.
Notes:
• DX coils are shipped capped and sealed with a
Nitrogen holding charge.
• Distributors are not used if only one refrigerant
feeder tube provided.
•
Metering devices on DX coils to be field provided.
• TXV’s are the advised method of refrigerant regu-
lation into the coil.
•
If a TXV is field installed the fixed orifice must be
removed prior to TXV installation. TXV’s
• All pipe connections need to be supported inde-
pendently from the header. Failure to do so may
cause cracking at the headers. All piping shall be
in accordance with local codes and follow accept-
ed industry standards. DX coil distributor cap for
test and nitrogen charge must be removed before
mounting TXV.
• These coils may be used in systems with hot gas
bypass or heat pump condensing units, but require
the addition of fittings or refrigerant specialties to
be furnished and installed by others.
Condensate Drain
All condensate drains must have a trap installed. This
will prevent excessive condensate buildup and/or con-
densate overflow. To ensure that the trap remains sealed
the trap depth and the distance between the pan outlet
and the trap outlet should be the total static pressure of
the unit plus one inch (see
Figure 10 on page 16
).
TSP + 1
TSP + 1
FIGURE 10 -
DRAIN TRAP
Electrical Installation
1. The Electrical service to the fan must be compat-
ible to the rated voltage on the motor nameplate,
and be in accordance with local codes.
2. The Fan segments metal casing must be connect-
ed to the buildings electrical ground on isolated
units.
3. Door electrical interlock is not offered.
4. Some motors have internal automatic reset over-
load protection.
5. Thermal motor protection is external to the unit.
Thermal protection and a disconnect switch are
provided by others.
6. Review wiring diagram and make necessary con-
nections accordingly.
ENVIRO-TEC
16
FORM ET102.19-NOM1 (0521)
SECTION 2 - INSTALLATION