With the refrigerant system completely evacuated the system can now be opened to allow the refrigerant
charge in the Outdoor unit to be released into the line set.
The Service Valves require Allen wrenches sized per the table to undo the valve stems .
Remove the brass caps from the Service Valves to access the valve stems.
QSCU-361
QSCU-481
QSCU-601
Open the service valves to flood the system with refrigerant.
Unscrew both valve stems until they come to a stop against the valve body, replace the Brass Caps and
then tighten the caps to prevent leaks.
Energize the breaker to allow system to be powered.
Unit is charged with enough R410A refrigerant for a line set of 25ft length.
QSCU-361
QSCU-481
QSCU-601
For longer line set lengths additional charge must be WEIGHED in per the following table
40
50
60
75
90
100
7.5oz
12.5oz
17.5oz
25oz
32.5oz
37.5oz
7.5oz
12.5oz
17.5oz
25oz
32.5oz
37.5oz
7.5oz
12.5oz
17.5oz
25oz
32.5oz
37.5oz
Standard Operation of the unit - Cooling
Indoor Temperature Split
20 DegF
Suction Pressure
125 Psig, approx 43 DegF
Suction Line Temperature
50-55 DegF
Installation and Maintenance Manual
QSCU-361
QSCU-481
QSCU-601
Service Valve Wrench size
Unit
R410A Charge
159 oz
Added Charge required for a line set of varying lengths
194 oz
194 oz
Unit Start Up
4mm
8mm
4mm
4mm
Suction Valve
4mm
Liquid Valve
4mm
Add Charge at
0.5oz/ft
0.5oz/ft
0.5oz/ft
Page 9
