5
Unitary Products Group
Each
coil
has an orifice installed in the fitting between the
liquid
line connection and distributor
. The orifice is
identi
-
fied
on a label next to the liquid line connection.
The
orifice shipped with the outdoor unit is based on the
“most
sold” combination, but it may be changed, depend
-
ing on the capacity and efficiency of the outdoor unit,
elevation differences, and/or long total line lengths. An
additional
orifice(s) is shipped with most outdoor units for
the
most commonly required replacement combinations.
Other sizes must be ordered from Source 1 Parts if re-
quired.
See the appropriate Tabular Data Sheet for the correct
orifice
size and charge adder
. If the orifice size matches,
nothing further is required and the refrigerant lines may
be
connected per the outdoor unit instruction. However
,
if
another
orifice should be used, see the
coil instruction for
details
to change the orifice in the coil.
OPENING BASE VALVES
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 count
-
er
clockwise until stem just touches retaining ring.
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 at
-
tempt
to open the valve.
All caps must be replaced to prevent leaks.
Some
units
may have factory installed 1–1/8” ball valves.
To
open the valve, remove the brass valve stem cap, lo
-
cated
on the side of the valve, with an adjustable wrench.
Next,
turn the valve stem 1/4 turn CCW (away from unit).
Replace
valve cap finger tight, then
tighten an additional
1/6 of a turn with a wrench, using a back–up wrench
on
the valve body
.
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 Refriger-
ant
Line length”.
Check
the system for
correct charge after all components
of
the system have been installed, connected and wired
correctly.
Connect service gauges to low pressure port and dis-
charge
service ports.
Allow
unit to operate until system pressures and temper
-
atures
have stabilized, making sure that the pressure and
temperature
align with
unit service data. If not, check sys
-
tem
charge and adjust if necessary
.
ELECTRICAL WIRING
To prevent electrical shock, open remote discon-
nect so electrical supply to outdoor unit is shut off.
Contactor
does not open
both sides of the 208/230
or
460 volt electrical circuit.
POWER SUPPLY
All
wiring must comply with N.E.C. and local codes. See
rating 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 con
-
trol
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. — T
wo are provided in the
con
-
trol
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 con
-
duit plate and discard. 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
terminals
o
n t
h
e o
utdoo
r u
ni
t c
ontactor
. S
e
e F
igur
e 3
.
5. Ground the outdoor unit using the ground lug pro-
vided. Unless the outdoor unit is grounded through
proper
wiring to the service entrance ground, a
suit
-
able
separate ground should be provided at the out
-
door
unit.
Casing
or cabinet must be
permanently grounded in
accordance
with National Electric Code
or other ap
-
plicable
local codes.
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