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Enertech Global IOM, VS/VT Models, Rev A
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ECM Temporary Replacement
ECM Motor Troubleshooting
Troubleshooting a TXV
Compressor Troubleshooting
Variable Speed Flow Centers
Return Conversion for and XT or CT
Heat Of Extraction and Rejection
Measuring Subcooling/Superheat
Nitrogen Purge While Brazing
Leak Testing an Air Coil
Loop Flushing
Repairing a Microchannel Air Coil
Testing a Coaxial Heat Exchanger
Troubleshooting a TXV
Section 12: Troubleshooting
Performance Check
Heat of Extraction(HE)/Rejection(HR)
Record information on the Unit Start-up Form
Equipment should be in full load operation for a
minimum of 10 minutes in either mode – WITH THE
HOT WATER GENERATOR TURNED OFF.
1. Determine ow rate in gallons per minute
• Check entering water temperature
• Check entering water pressure
• Check leaving water pressure
Once this information is recorded,
• Find corresponding entering water temperature
column in the HE/HR Table.
• Find pressure differential in PSI column.
• Then read the GPM column to determine ow in
GPM.
2. Check leaving water temperature of unit.
• FORMULA: GPM x water temp diff. x 485
(antifreeze) or 500 (fresh water) = HE or HR in
BTU/HR
A 10% variance from table is allowed. Always use
the same pressure gauge & temperature measuring
device. Water ow must be in range of table. If
system has too much water ow, performance
problems should be expected.
Installing a YT Vertical Unit
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