WaterFurnace Envision2 - Manual (Page 46)

46
ENVISION 2 COMPACT 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