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9
Fixed Orifice
CAUTION
To prevent personal injury, carefully connect and disconnect
manifold gauge hoses. Escaping liquid refrigerant can cause
burns. Do not vent refrigerant into the atmosphere. Recover all
refrigerant during system repair and before final unit disposal.
1. Purge gauge lines. Connect service gauge manifold to
base-valve service ports. Run system at least 10 minutes
to allow pressure to stabilize.
2. Temporarily install thermometer on suction (large) line
near suction line service valve with adequate contact and
insulate for best possible reading.
3. Refer to the superheat table provided for proper system
superheat. Add charge to lower superheat or recover
charge to raise superheat.
4. Disconnect manifold set, installation is complete.
Superheat Formula = Suct. Line Temp. - Sat. Suct. Temp.
Expansion Valve System
1. Purge gauge lines. Connect service gauge manifold
tobase-valve service ports. Run system at least 10 min-
utes to allow pressure to stabilize.
2. Temporarily install thermometer on liquid (small) line near
liquid line service valve with adequate contact and insu-
late for best possible reading.
3. Check subcooling and superheat. Systems with TXV ap-
plication should have a subcooling of 7 ± 2 ºF and super-
heat of 8 ± 1 ºF.
a. If subcooling and superheat are low, adjust TXV to
8 ± 1 ºF superheat, then check subcooling.
NOTE: To adjust superheat, turn the valve stem clock-
wise to increase and counter clockwise to decrease.
b. If subcooling is low and superheat is high, add charge
to raise subcooling to 7 ± 2ºF then check super-
heat.
c. If subcooling and superheat are high, adjust TXV
valve to 8 ± 1 ºF superheat, then check subcooling.
d. If subcooling is high and superheat is low, adjust
TXV valve to 8 ± 1 ºF superheat and remove charge
to lower the subcooling to 7 ± 2ºF.
NOTE: Do NOT adjust the charge based on suction pres-
sure unless there is a gross undercharge.
4. Disconnect manifold set, installation is complete.
Subcooling Formula = Sat. Liquid Temp. - Liquid Line Temp.
NOTE: Check the Schrader ports for leaks and tighten valve
cores if necessary. Install caps finger-tight.