C L I M A T E M A S T E R W A T E R - S O U R C E H E A T P U M P S
Vertical DOAS
R e v. : 0 1 / 3 1 / 1 3
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C l i m a t e M a s t e r Wa t e r - S o u r c e H e a t P u m p s
Severe Burnouts
• If the burnout is severe, recover the refrigerant charge
or transfer it to an unused portion of the refrigeration
circuit such as the receiver. You may need to energize
the liquid line solenoid valve to evacuate the circuit
completely. On systems equipped with an optional
tower water condenser, take care to avoid freezing the
condenser during evacuation.
• Verify that the TXV and solenoid valves are not
plugged with debris. Clean or replace them if
necessary.
• Replace the suction filter with a suction line
filter-drier.
Sporlan Valve Corporation manufactures special “HH”
filter-driers for cleaning system burnouts. These filters
are equipped with a tap for measuring the pressure drop
across the filter. If you install a filter without a tap, solder
a tap in the suction line immediately upstream of the
filter.
• Remove the old liquid line filter-drier and replace it
with a new “HH” type filter one size larger than the
original.
• Remove the old compressor if you have not already
done so.
• Install the new compressor. Be careful not to overheat
its pipe stubs if it is not equipped with rotolock
connections.
• Evacuate the system to purge the moisture and non-
condensables from it.
• Check the compressor contractor for damage or
pitted contacts. Some single-phase compressors are
equipped with start capacitors, run capacitors, and
starting delays. Check these components and replace
them if necessary.
• Check the piping and joints for leaks, and recharge the
system.
• Run the refrigeration system for an hour while you
monitor the pressure drop across the suction filter.
If the pressure drop is 3 psig or less after one hour,
continue to run the system for 24 hours, then take an
oil sample.
• If the oil sample is dirty or acidic, or if the one-hour
pressure drop is greater than 3 psi, then recover the
system charge and replace both the suction and liquid
filter-dryers. Repeat the previous step until your oil
sample tests negative.
