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Refrigerant charge, Gssd units coupled with twe air handlers – Trane GSSD User Manual

Page 16

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16

GSSD Units Coupled with
TWE Air Handlers

The GSSD IS coupled with the TWE-

E series. Table 4 may be used to deter-

mine the amount of charge necessary
for the split unit system without any

refrigerant line connecting the two.

Table 5 can be used to determine the
amount of refrigerant needed for lines.

By adding the two weights together,

the approximate total system charge
can be obtained. For fine tuning the

charge, see Units Coupled with Non-

TWE Air Handlers and Fine Tuning
in next section.

Note:

If piping runs exceed 50 feet, the next
highest pipe size should be used.

GSSD Units Coupled with
Non-TWE Air Handlers and
Fine Tuning

1. Place the GSSD system in the

cooling mode.

2. Throttle down the water flow

with a ball valve until the leaving

fluid temperature is 95 degrees F.

3. Charge the system unit until a

level of 10 degrees superheat is

achieved. To determine super-

heat, an accurate suction line

temperature needs to be taken

along with the suction pressure.

4. The sub-cooling will be approxi-

mately 8 degrees to 5 degrees F.

5. Allow system to run 20 minutes

for conditions to stabilize

before measuring the super-

heat.

6. Return water flow to 3 gpm per

nominal ton of capacity.

Table 4: R22 Requirements

GSSD
Model

Number

TWE

Model

Number

Lbs of R22

for both

GSSD & TWE

GSSD024

TWE031E

5.0

GSSD030

TWE031E

5.0

GSSD036

TWE040E

8.25

GSSD042

TWE040E

9.25

GSSD048

TWE065E

9.25

GSSD060

TWE065E

10.125

GSSD072

TWE065E

10.75‘

Table 5: R22 requirement per foot of line

O.D. Tube

Size

Liquid Line

(oz.)

Suction

Line (oz.)

1/4-inch

0.352

N/A

3/8-inch

0.928

N/A

1/2-inch

1.152

0.032

5/8-inch

1.840

0.048

3/4-inch

4.272

0.064

7/8-inch

N/A

0.080

1 1/8-inch

N/A

0.144

Refrigerant Charge