Manitowoc Indigo Series Technician's Handbook page 196

Operational Analysis
Harvest Valve
Suction Line Temperature
Attach a temperature probe
on the suction line within 6 in.
of the shut-off valve outlet.
Record the low event at the
end of the Freeze cycle.
Final Analysis
Enter total number of boxes
checked in each column.
Twin Expansion Valve – I1470C/I1870C/I2170C Models
1
Audible refrigerant flow
through left or right
valve in Freeze cycle
Suction line
temperature at the
suction shut-off valve is
greater than 10°F
(-12.2°C)
at the end of the Freeze
cycle
Harvest Valve
Leaking
2
No audible
refrigerant flow through refrigerant flow through
left or right valve in left or right valve in
Freeze cycle
Suction line
temperature at the
suction shut-off valve is suction shut-off valve is
greater than 10°F
(-12.2°C)
at the end of the Freeze at the end of the Freeze
cycle
Low on charge
-or-
TXV starving
3
No audible
refrigerant flow through
left or right valve in
Freeze cycle
Suction line
temperature at the temperature at the
suction shut-off valve is
less than 10°F greater than 10°F
(-12.2°C)
at the end of the Freeze
cycle
Refrigerant
Overcharge
-or-
TXV flooding
4
No audible
Freeze cycle
Suction line
(-12.2°C)
cycle
Compressor