CAUTION: Casing or cabinet must be permanently grounded
in accordance with National Electric Code or other
applicable local codes.
LOW VOLTAGE
Control wiring may vary, depending upon the type of thermo-
stat, furnace or air handler being connected.
Low voltage wiring diagrams can be found with the furnace or
air conditioning blower package installation instructions.
Pig-tail connector wires (two blue or one blue, one brown) are
provided from the low voltage pull-in coil on the contactor to a
section of the control box. A “fingered” bushing is provided in
the low voltage knockout hole. If
1
⁄
2
" conduit is used for the low
voltage wiring, the bushing is to be removed.
1.
Route the low voltage cable through the fingered bushing
in the low voltage junction box. See Figure 3 and 4.
2.
Using wire nuts, connect low voltage wiring as shown in
Figure 5.
3.
A minimum 19 AWG wire gauge for total lengths not
exceeding 130 feet must be used in connecting the low
voltage control wiring between the outdoor unit, furnace
and thermostat. For longer low voltage control wiring
lengths, consult the N.E.C.
Connect thermostat and control package wiring as shown
in Figure 5 and per the instructions packed with those
pieces.
SYSTEM CHARGE
The factory charge in the outdoor unit includes enough charge
for the unit and a most sold matched evaporator. Some indoor
coil matches may require some additional charge. See Tabular
Data sheet provided in unit literature packet.
Sweat connect units also include sufficient charge for 15 feet
of lines. Pre-charged line lengths are factory charged with the
correct amount of refrigerant required. Table 2 lists the refrig-
erant line charges.
The “TOTAL SYSTEM CHARGE” must be permanently
stamped on the unit data plate.
Total system charge is determined as follows:
1.
Determine outdoor unit charge from tabular data sheet.
2.
Determine indoor coil adjustment from tabular data sheet.
3.
Calculate the line charge using Table 2 factors. Calculate
over 15 feet of sweat lines for sweat connect units.
NOTE: For sweat connect lines, the line charge over 15 feet
should be included on the data plate and must be
added to the system.
4.
Total system charge = item 1 + item 2 + item 3.
5.
Permanently stamp the unit data plate with the total
amount of refrigerant in the system.
Use one of the following charging methods whenever addi-
tional refrigerant is required for the system charge.
CAUTION: Refrigerant charging should only be carried out by
a qualified air conditioning contractor.
Measurement Method
If a calibrated charging cylinder or accurate weighing device is
available, add refrigerant accordingly.
CAUTION: Compressor damage will occur if system is improp-
erly charged. On new system installations charge
system per R-22 charge information label and fol-
low guidelines in this instruction.
Check flare caps on service ports to be sure they are leak tight.
DO NOT OVER TIGHTEN (between 40 and 60 inch - lbs.
maximum).
Superheat Charging Method
NOTE: Use this method only during system maintenance and
repair.
1.
Operate system until temperatures and pressures stabi-
lize (minimum of 10 minutes).
2.
Measure and record indoor wet bulb (WB) temperature
using a sling psychrometer and the outdoor dry bulb (DB)
temperature using a thermometer.
C Y R G W
W
G
R
Y
CONTACTOR
TERMINALS
FURNACEORAIRHANDLERTERMINALBLOCK
POWER
CONTROL
FACTORY
ROOMTHERMOSTAT
*
*TerminalWisonly
requiredonsystems
withheat.
POWERWIRING
208/230-1-60
230-1-50
COIL
GROUND
SCREW
ALLFIELDWIRINGTOBEINACCORDANCEWITHNATIONALELECTRICALCODE(NEC)AND/ORLOCALCODES
ALLOUTDOORWIRINGMUSTBEWEATHERPROOF. USECOPPERCONDUCTORSONLY.
24VOLTCONTROLWIRING
Minimum18GA.Wire
(NECClass2)
FIGURE 5 - TYPICAL FIELD WIRING
550.46-N1YI
6
Unitary Products Group
