66901 / 035-20393-001 Rev. C (1204)
Unitary Products Group
5
7.
Install TXV equalizer line in 1/8” hole previously made in vapor
line. Equalizer line should not be bottomed out in the vapor line.
Insert equalizer line at least 1/4” in the vapor line. Braze equalizer
line making sure that tube opening is not brazed closed.
All connections to be brazed are copper-to-copper and should be
brazed with a phosphorous-copper alloy material such as Silfos-5 or
equivalent. DO NOT use soft solder.
Install the TXV bulb to the vapor line near the equalizer line, using the
two bulb clamps furnished with the TXV assembly. Ensure the bulb is
making maximum contact. Refer to TXV installation instruction for view
of bulb location.
a.
Bulb should be installed on a horizontal run of the vapor line if
possible. On lines under 7/8" OD the bulb may be installed on
top of the line. With 7/8" OD and over, the bulb should be
installed at the position of about 2 or 10 o'clock.
b.
If bulb installation is made on a vertical run, the bulb should
be located at least 16 inches from any bend, and on the tub-
ing sides opposite the plane of the bend. The bulb should be
positioned with the bulb tail at the top, so that the bulb acts as
a reservoir.
c.
Bulb should be insulated using thermal insulation provided to
protect it from the effect of the surrounding ambient tempera-
ture.
SECTION V: ELECTRICAL CONNECTIONS
GENERAL INFORMATION & GROUNDING
Check the electrical supply to be sure that it meets the values specified
on the unit nameplate and wiring label.
Power wiring, control (low voltage) wiring, disconnect switches, and
over current protection must be supplied by the installer. Wire size
should be sized per NEC requirements.
The complete connection diagram and schematic wiring label is located
on the inside surface of the unit service access panel.
FIELD CONNECTIONS POWER WIRING
1.
Install the proper size weatherproof disconnect switch outdoors
and within sight of the unit.
2.
Remove the screws at the bottom of the corner cover. Slide corner
cover down and remove from unit. See Figure 5.
3.
Run power wiring from the disconnect switch to the unit.
4.
Remove the service access panel to gain access to the unit wiring.
Route wires from disconnect through power wiring opening pro-
vided and into the unit control box.
5.
Install the proper size time-delay fuses or circuit breaker, and
make the power supply connections.
FIELD CONNECTIONS CONTROL WIRING
1.
Route low voltage wiring into bottom of control box. Make low volt-
age wiring connections inside the junction box per Figures 7-9.
2.
The complete connection diagram and schematic wiring label is
located on the inside surface of the unit service access panel.
3.
Replace the corner cover and service access panel that were
removed in Steps 2 and 4 of the “Field Connections Power Wiring”
section.
4.
All field wiring to be in accordance with national electrical codes
(NEC) and/or local-city codes.
5.
Mount the thermostat about 5 ft. above the floor, where it will be
exposed to normal room air circulation. Do not place it on an out-
side wall or where it is exposed to the radiant effect from exposed
glass or appliances, drafts from outside doors, or supply air grilles.
6.
Route the 24-volt control wiring (NEC Class 2) from the outdoor
unit to the indoor unit and thermostat.
NOTE:
To eliminate erratic operation, seal the hole in the wall at the
thermostat with permagum or equivalent to prevent air drafts
affecting the operation of in the thermostat.
CFM SELECTION BOARD SETTINGS
For proper system operation the CFM Selection Board jumpers must be
set properly.
Refer to the Tabular Data Sheet for the recommended air flow settings
for each size condensing unit.
Set the cooling speed per the instructions for the air handler or furnace
by selecting the correct COOL and ADJ taps. Verify the airflow using
the LED display on the CFM selection board.
The HUMIDISTAT jumper must also be removed if a dehumidistat is
installed.
Dry nitrogen should always be supplied through the tubing while it
is being brazed, because the temperature is high enough to cause
oxidation of the copper unless an inert atmosphere is provided. The
flow of dry nitrogen should continue until the joint has cooled.
Always use a pressure regulator and safety valve to insure that only
low pressure dry nitrogen is introduced into the tubing. Only a small
flow is necessary to displace air and prevent oxidation.
In all cases, mount the TXV bulb after vapor line is brazed and has
had sufficient time to cool.
All field wiring must USE COPPER CONDUCTORS ONLY and
be in accordance with Local, National, Fire, Safety, & Electrical
Codes. This unit must be grounded with a separate ground
wire in accordance with the above codes.
FIGURE 5:
Typical Field Wiring
FIGURE 6:
CFM Selection Board
CONTROL
WIRING
POWER
WIRING
CORNER
COVER
SERVICE
ACCESS
PANEL
CFM SELECTION BOARD
TAP SELECTION
D
C
B
A
D
C
B
A
COOL
HEAT
ADJ
DELAY
REMOVE FOR
HEAT PUMP
HUMIDISTAT
