49
VERSATEC ULTRA SERIES INSTALLATION MANUAL
Symptom
Head
Pressure
Suction
Pressure
Compressor
Amp Draw
Superheat
Subcooling
Air Temp.
Differential
Water Temp.
Differential
Under Charged System (Possible Leak)
Low
Low
Low
High
Low
Low
Low
Over Charged System
High
High
High
Normal
High
Normal/Low
Normal
Low Air Flow Heating
High
High
High
High/Normal
Low
High
Low
Low Air Flow Cooling
Low
Low
Low
Low/Normal
High
High
Low
Low Water Flow Heating
Low/Normal
Low/Normal
Low
Low
High
Low
High
Low Water Flow Cooling
High
High
High
High
Low
Low
High
High Air Flow Heating
Low
Low
Low
Low
High
Low
Low
High Air Flow Cooling
Low
High
Normal
High
Low
Low
Normal
High Water Flow Heating
Normal
Low
Normal
High
Normal
Normal
Low
High Water Flow Cooling
Low
Low
Low
Low
High
Normal
Low
Low Indoor Air Temperature Heating
Low
Low
Low
Normal
High
Normal
Normal/High
Low Indoor Air Temperature Cooling
Low
Low
Low
Normal/Low
High
Low
Low
High Indoor Air Temperature Heating
High
High
High
Normal/High
Normal/Low
Low
Normal
High Indoor Air Temperature Cooling
High
High
High
High
Low
Low
High
Restricted TXV (Check Service Advisory)
High
Low
Normal/Low
High
High
Low
Low
Insufficient Compressor (Possible Bad Valves)
Low
High
Low
High
Normal/High
Low
Low
TXV - Bulb Loss of Charge
Low
Low
Low
High
High
Low
Low
Scaled Coaxial Heat Exchanger Heating
Low
Low
Low
Normal/Low
High
Low
Low
Scaled Coaxial Heat Exchanger Cooling
High
High
High
Normal/Low
Low
Low
Low
Restricted Filter Drier
Check temperature difference (delta T) across filter drier.
7/6/10
Refrigerant Circuit Guideline
Reference Calculations
Heating Calculations:
Cooling Calculations:
LWT = EWT +
LAT(DB) = EAT(DB) -
LC = TC - SC
S/T =
HR
gpm x 500
SC
cfm x 1.08
SC
TC
HE
gpm x 500
LWT = EWT -
LAT = EAT +
TH = HC + HWC
HC
cfm x 1.08
Legend
ABBREVIATIONS AND DEFINITIONS:
cfm
= airflow, cubic feet/minute
EWT = entering water temperature, Fahrenheit
gpm = water flow in gallons/minute
WPD = water pressure drop, PSI and feet of water
EAT
= entering air temperature, Fahrenheit
(dry bulb/wet bulb)
HC
= air heating capacity, MBtu/h
TC
= total cooling capacity, MBtu/h
SC
= sensible cooling capacity, MBtu/h
KW
= total power unit input, kilowatts
HR
= total heat of rejection, MBtu/h
HE
= total heat of extraction, MBtu/h
HWC = hot water generator capacity, MBtu/h
EER
= Energy Efficient Ratio
= BTU output/Watt input
COP = Coefficient of Performance
= BTU output/BTU input
LWT = leaving water temperature, °F
LAT
= leaving air temperature, °F
TH
= total heating capacity, MBtu/h
LC
= latent cooling capacity, MBtu/h
S/T
= sensible to total cooling ratio
Summary of Contents for Versatec Ultra Series
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