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Expansion Valve (TXV) System
Single Speed Application (DP5HH24-36)
Purge gauge lines. Connect service gauge manifold to
access fittings. Run system at least 10 minutes to allow
pressure to stabilize.
4. Temporarily install thermometer on liquid (small) line
near liquid line access fitting with adequate contact
and insulate for best possible reading.
5. Check subcooling and superheat. Systems with TXV
application should have a subcooling and superheat
within the range listed on the chart.
a. If subcooling and superheat are low, adjust TXV
then check subcooling.
b. If subcooling is low and superheat is high,
add charge to raise subcooling then check
superheat.
c. If subcooling and superheat are high, adjust TXV
valve then check subcooling.
d. If subcooling is high and superheat is low, adjust
TXV valve superheat and remove charge to
lower the subcooling.
The TXV should NOT be adjusted at light load conditions
55º to 60ºF, under such conditions only the subcooling
can be evaluated. This is because suction pressure is
dependent on indoor air flow, and wet bulb temperature.
NOTE: Do NOT adjust charge based on suction
pressure unless there is a gross undercharge.
6. Disconnect manifold set. Installation is complete.
Two Speed Application (DP5HH42-60)
Run the unit on low stage cooling for 10 minutes until
refrigerant pressures stabilize. Follow the guidelines and
methods below to check unit operation and ensure that the
refrigerant charge is within limits. Charge the unit on low
stage.
1. Purge gauge lines. Connect service gauge manifold
to access fittings. Run system at least 10 minutes to
allow pressure to stabilize.
2. Temporarily install thermometer on liquid (small) line
near liquid line access fitting with adequate contact
and insulate for best possible reading.
3. Check subcooling and superheat. Two stage
systems running on low stage with TXV application
should have a subcooling and superheat within the
range listed on the chart.
a. If subcooling and superheat are low, adjust TXV
superheat, then check subcooling.
NOTE: To adjust superheat, turn the valve stem
clockwise to increase and counter clockwise to
decrease.
b. If subcooling is low and superheat is high,
add charge to raise subcooling then check
superheat.
c. If subcooling and superheat are high, adjust
TXV valve superheat, then check subcooling.
d. If subcooling is high and superheat is low, adjust
TXV valve superheat and remove charge to
lower the subcooling.
NOTE: Do NOT adjust the charge based
on suction pressure unless there is a gross
undercharge.
4. Disconnect manifold set, installation is
complete.
Design superheat @ 95°F
outdoor ambient temperature
Model
*PHH52441
*PHH53041
*PHH53641
*PHH54241
*PHH54841
*PHH56041
ELECTRIC HEAT INSTALLATION &
ADJUSTMENT
This series of electric cooling and heat pump package
equipment is designed to accept a field installed electric
heat kit. The unit is equipped to easily install the HKR/HKP
Series Electric Heat Kit. Full Installation Instructions are
included in this kit. Please use this document for guidance
in field equipping the package unit with electric heat.
Choose the heat kit that fits the application for the specific
installation. Permanently mark the unit's nameplate
with the model being installed. High and low voltage
connections are detailed in the heat kit instructions.
Indoor Blower motor speed tap selection may need
to be modified to accommodate normal continuous
operation to prevent a nuisance trip. See following tables.
12
DP5HH
Superheat
Supercooling
± 2°F
± 2°F
12°
-
9°
-
10°
-
13°
15°
11°
17°
13°
19°
Table 6
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Troubleshooting
