035-15806-004 Rev. A (1000)
6
Unitary Products Group
REFRIGERANT VALVE OPERATION
All models in this series have brass service valves. These
valves are not back seating. Opening or closing valve does
not close service port. Service ports have Schrader valves for
gauge connections. Use back-up wrench on valve body when
removing cap to open or close the valve. To open, insert hex
wrench into stem and back out counter clockwise until stem
just touches retaining ring.
All caps must be replaced to prevent leaks.
OIL TRAPPING
When the outdoor unit is above the indoor coil oil trapping is
necessary. Please refer to APPLICATION DATA, 690.01-
AD1V (1296) and worksheet 690.01-AD1.1V (791) “General
Piping Recommendations and Refrigerant Line length".
Check the system for correct charge after all components of
the system have been installed, connected and wired cor-
rectly.
Connect service gauges to low pressure port and discharge
service ports.
Allow unit to operate until system pressures and tempera-
tures have stabilized, making sure that the pressure and tem-
perature align with unit service data. If not, check system
charge and adjust if necessary.
ELECTRICAL WIRING
POWER SUPPLY
All wiring must comply with N.E.C. and local codes. See rat-
ing plate and product data sheet for volts, frequency, phase,
maximum fuse size and minimum branch circuit ampacity.
Refer to the wiring diagram inside the unit control box cover
before connecting to power supply.
1.
The line voltage service wiring for the outdoor unit must
include a disconnect switch located within sight of the
outdoor unit.
2.
Use the correct size fuse or circuit breaker as listed on
the unit rating plate and data sheet. See Tabular Data
Sheet for minimum recommended wire size. If using
nonmetallic-sheathed cable (NM or NM-B) ampacities
shall be that of 60º C conductors per N.E.C. 336-26.
3.
Wiring connections. - Two are provided in the control
box:
a.
One for low voltage wiring.
b.
One entrance for high voltage.
The reversible High Voltage Conduit Plate is factory installed
for 1/2" conduit connections. For 3/4" conduit, remove the
screw holding the plate in place and reverse the location of
the holes. For 1" conduit, remove the conduit plate and dis-
card. Re-install screw to maintain the integrity of the unit
structure, regardless of the conduit being used. See Figure 3.
4.
Power connection to the unit is facilitated by screw termi-
nals on the outdoor unit contactor. See Figure 3.
5.
Ground the outdoor unit using the ground lug provided.
Unless the outdoor unit is grounded through proper wir-
ing to the service entrance ground, a suitable separate
ground should be provided at the outdoor unit.
6.
Use copper conductors only.
If the valve stem is backed out beyond the retaining
ring, system pressure could force the stem out of the
valve body and possibly cause personal injury. In
the event that the retaining ring is missing do not
attempt to open the valve.
To prevent electrical shock, open remote disconnect
so electrical supply to outdoor unit is shut off. Con-
tactor does not open both sides of the line volt elec-
trical circuit.
Casing or cabinet must be permanently grounded in
accordance with National Electric Code or other
applicable local codes.
