Install Instructions

60
IOM - HZH/HZV Series
Functional Troubleshooting
Note: Never connect refrigerant gauges during startup procedures. Conduct water-side analysis using P/T
ports to determine water flow and temperature difference. If water-side analysis shows poor performance,
refrigerant troubleshooting may be required. Connect refrigerant gauges as a last resort.
Packaged Unit Refrigeration Schematic
Rev. 12/08
Customer: _____________________________________
Antifreeze: ________________________
Model#: ________________________ Serial#: ________________ Loop type: _______________
Complaint: ________________________________________________________________________
COAX
COMPRESSOR
DISCHARGE
SUCTION
HWG
COOLING CYCLE ANALYSIS -
COAX
COMPRESSOR
DISCHARGE
SUCTION
HWG
HEATING CYCLE ANALYSIS -
PSI
SAT
PSI
SAT
°F
°F
AIR
COIL
°F °F
FP2: HEATING
LIQUID LINE
°F
EXPANSION
VALVE
AIR
COIL
°F °F
PSI
SAT
PSI
SAT
°F
°F
°F °F
WATER IN WATER OUT
PSI PSI
°F °F
WATER IN WATER OUT
PSI PSI

Use 500 for water, 485 for antifreeze.
FILTER
DRIER*
FLASH
GAS LINE
°F
FP1
SENSOR
°F
EXPANSION
VALVE
FILTER
DRIER*
FP2: FLASH
GAS LINE
°F
OTHER SIDE
OF FILTR DR
°F
FP1: CLG
LIQ LINE
°F
Refrigerant Type:
HFC-410A
Heat of Extraction (Absorption) or Heat of Rejection =
________ flow rate ( diff. ( factor = _____________
(Btu/hr)
Superheat
Subcooling
Suction temperature- suction saturation temp.
Discharge saturation temp.-liquid line temp.
=
=
=
=
(deg F)
(deg F)
gpm) x ________ temp. deg. F) x ________ fluid

Date: ________________________
Voltage: ________
Comp Amps: _______
Total Amps: ________
Location: ________________________
Model Number: ________________________
Serial Number: ________________________
Look up pressure drop in
I.O.M. or spec. catalog to
determine flow rate.
Look up pressure drop in
I.O.M. or spec. catalog to
determine flow rate.
Refrigerant Circuit Diagrams