Modine Manufacturing GEO16-501.4, Installation And Service Manual

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17
GEO16-501.4
START-UP PROCEDURE
Table 17.1 - Compressor Winding Resistance (Ohms)
Table 17.2 - Refrigerant Circuit Malfunctions and Probable Causes
➀
The following chart will assist in troubleshooting and diagnosing causes of a problematic unit. The chart provides general guidance
for system measurements relative to typical operating conditions.
Cause
Symptom
Head Press.
Suct.
Press.
Comp Amp
Draw
Superheat Subcool
Air Temp
Diff.
Water (Source)
Temp Diff
Undercharged System Low Low Low High Low Low Low
Overcharged System High High High Normal High Normal Normal
Low Air Flow / Load Water Flow - Heating High High High High Low High Low / Normal
Low Air Flow / Load Water Flow - Cooling Low Low Low Low / Normal High High Low / Normal
Low Source Water Flow - Heating Low Low Low Low High Low High
Low Source Water Flow - Cooling High High High High Low Low High
High Air Flow / Load Water Flow - Heating Low Low Low Low High Low Normal / High
High Air Flow / Load Water Flow - Cooling Normal / High High Normal / High High Low Low Normal / High
High Source Water Flow - Heating Normal / High High Normal / High High Low / Normal High Low
High Source Water Flow - Cooling Low Low Low Low High High Low
Low Indoor Air / Load Water Temp - Heating Low Low Low Low / Normal High High Normal / High
Low Indoor Air /Load Water Temp - Cooling Low Low Low Low / Normal High Low Low
High Indoor Air / Load Water Temp - Heating High High High Normal / High Low / Normal Low Low
High Indoor Air / Load Water Temp - Cooling High High High High Low Low High
Restricted TXV High Low Low / Normal High High Low Low
TXV Bulb Failure (Loss of Charge) Normal Low Normal High High Low Low
Restricted Filter/Drier
1
High Low Low / Normal High High Low Low
Inefficient Compressor Low High Low High High Low Low
Scaled / Fouled Load Heat Exchanger - Heating High High High High Low Low Low
Scaled / Fouled Load Heat Exchanger - Cooling Low Low Low Low / Normal High Low Low
Scaled / Fouled Source Heat Exchanger - Heating Low Low Low Low / Normal High Low Low
Scaled / Fouled Source Heat Exchanger - Cooling High High High High Low Low Low
➀
Restricted filter / drier will have symptoms similar to restricted TXV. Check temperature drop across filter drier to verify a restriction.
Compressor C to S C to R S to R
ZPS20K5E-PFV
1.64 1.30 2.94
ZPS26K5E -PFV
1.91 1.02 2.93
ZPS30K5E -PFV
1.52 0.89 2.40
ZPS35K5E -PFV
1.55 0.62 2.17
ZPS40K5E-PFV
1.87 0.52 2.38
ZPS49K5E-PFV
1.67 0.42 2.09
ZPS51K5E-PFV
1.67 0.42 2.09
ZPS60K5E-PFV
1.91 0.36 2.27