COMMON
SUCTION
PORT
HIGH
PRESSURE
SWITCH
COMMON
DISCHARGE
REFRIGERANT PROCESSING
Charging Unit
1.
Attach manifold set, vacuum pump, & micron Gauge.
See Figure 18 .
2.
Evacuate line to 500 microns or less to insure all
moisture has been removed and there are no leaks.
See Figure 19 .
• Evacuate
• Pressurize with 100psi
N2 or Nitrogen
• Evacuate again
• Charge with R410A
3.
Verify evacuation and leak free joints. Back-seat valves
(counter-clockwise) to open and allow factory charge to
fi ll lines and indoor unit. See Figure 20 .
Refer to refrigerant charge table for specifi ed charge.
4.
Charge to proper weight. Charge based on feet of
interconnect. Only add/remove R410A in liquid
form. See Table 6, Page 16 .
5.
Refer to charts beginning on page 16 to “fi ne tune” the
refrigerant charge to meet your conditions.
Systems require fi eld charge adjustments. Refer to
“Refrigerant Charge Tables” for proper weight charge
and Operation Charts for proper system pressures and
temperatures at different outdoor conditions. Sub-cool
should be used for fi nal system charge.
Charging should be suitable charge weighed in with
scale.
NOTICE
It is illegal to discharge refrigerant into the
atmosphere. Use proper reclaiming methods &
equipment when installing or servicing this unit.
• Measure all heat pump saturated suction pressures at
the Common Suction Port not vapor Service Valve.
• Common Suction Port includes pressure drop and
temperature increase through reversing valve resulting
in a more accurate and complete system charge.
• Port may also be used to charge system in heating
mode when both sides of line set are at high system
pressures or to determine saturated evaporator
pressure while in heating mode.
Figure 18 - Manifold Set Connections At Unit
Figure 19 - Manifold Set Up For Evacuation
A
A
B
B
C
C
S1HV
S1HV
Shown
Shown
A
Manifold
B
B
Vacuum Pump
C
C
Micron Gage
Figure 20 - Charging
Straight Cool Condenser Use
Valves
Heat Pump Unit Use Common
Suction
Common
Suction
High Pressure
Switch
High Pressure
Switch
HIGH PRESSURE
RED
LOW PRESSURE
BLUE
S1HV
Shown
Figure 21 - Common Suction, Discharge, and
High Pressure Switch
15
