valent VRC Series Installation, Operation & Maintenance Instructions Manual page 11

Charging Guidelines
Each circuit should be charged with the
compressor(s) at 100% and as much DX/condenser
load (highest ambient) as possible. Hot gas reheat
should be at 0% during initial charging. Let the
system run for at least 10 minutes between each
adjustment before rechecking. Refer to the following
table for adjustments.
Base Charge Measurement
High superheat and low subcooling = Undercharged
Low superheat and high subcooling = Overcharged
Normal superheat and low subcooling = Undercharged
Normal superheat and high subcooling = Overcharged
High superheat and normal subcooling = Over restricted
Low superheat and normal subcooling = Under restricted
High superheat and high subcooling = Over restricted
Low superheat and low subcooling = Under restricted
Recommended Line Sizes
All line lengths are equivalent line lengths and must
account for fitting pressure drop.
Casing Tonnage
5
110 8
10
10
13
16
210
18
20
25
25
30
310
35
40
* Line size in this column = stub connection size on the VPR and VRC units.
VRC Series IOM
Technical Support: (800) 789-8550
Add refrigerant to the system in small increments (0.5-1 lb.)
Remove refrigerant from the system in small increments (0.5-1 lb.)
Add refrigerant to the system in small increments (0.5-1 lb.)
Remove refrigerant from the system in small increments (0.5-1 lb.)
Nominal
Circuit Capacity
(BTU/hr)
A 67,700
A 99,691
A 128,662
A 64,877
B 68,382
A 63,413
B 98,057
A 100,505
B 99,547
A 100,336
B 130,206
A 130,937
B 132,322
A 133,719
B 171,374
A 157,576
B 157,673
A 152,579
B 228,142
A 199,312
B 230,993
A 252,507
B 259,060
11
Adjustment
Loosen TXV adjustment screw by 1 or 2 turns
Tighten TXV adjustment screw by 1 or 2 turns
Loosen TXV adjustment screw by 1 or 2 turns
Tighten TXV adjustment screw by 1 or 2 turns
Discharge Line Size (inches)
0 – 40 ft * 40 – 100 ft
1/2 5/8
5/8 7/8
7/8 7/8
1/2 5/8
1/2 5/8
1/2 5/8
5/8 7/8
5/8 7/8
5/8 7/8
5/8 7/8
7/8 7/8
7/8 7/8
7/8 7/8
7/8 7/8
7/8 7/8
7/8 7/8
7/8 7/8
7/8 7/8
7/8 1 1/8
7/8 7/8
7/8 1 1/8
7/8 1 1/8
7/8 1 1/8
Liquid Line
Size (inches)
0 – 100 ft *
1/2
1/2
5/8
1/2
1/2
1/2
1/2
1/2
1/2
1/2
5/8
5/8
5/8
5/8
7/8
5/8
5/8
5/8
7/8
7/8
7/8
7/8
7/8
IOM-M2-0316
Part Number 478603