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035-13606-003 Rev. A (202)
8 Unitary Products Group
E
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.
MEASUREMENT METHOD
If a calibrated charging cylinder or accurate weighing device
is available, add refrigerant accordingly.
SUPERHEAT CHARGING METHOD
NOTE:
Use this method only during system maintenace
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.
FIGURE 5 : TYPICAL FIELD WIRING
ALL FIELD WIRING TO BE IN ACCORDANCE WITH ELECTRIC CODE (NEC) AND/OR LOCAL CODES
POWER WIRING
208/230-1-60
230-1-50
CONTACTOR
TERMINALS
COIL
GND.
LUG
CYRGW
YRGW
POWER WIRING
CONTROL WIRING
FACTORY WIRING
24 VOLT CONTROL WIRING
MINIMUM 18 GA. WIRE
(NEC CLASS 2)
FURNACE OR AIR HANDLER TERMINAL BLOCK
ROOM THERMOSTAT
CONDENSING UNIT
ALL OUTDOOR WIRING MUST BE WEATHERPROOF. USE COPPER CONDUCTORS ONLY.
TERMINAL W IS ONLY
REQUIRED ON SYSTEMS
WITH HEAT.
*
*
Refrigerant charging should only be carried out
by a qualified air conditioning contractor.
Compressor damage will occur if system is
improperly charged. On new system installations
charge system per R-22 charge information label
and follow 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).