Product Tab
Note: The below default values are based on the “< 5 Ton Std Eff PTHP Comp, Cond, Evap” library member.
Rated Heating Capacity
Default: Auto Sized
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Typical Range: N/A
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Min Max: 0 < X < 100,000,000,000,000
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Units: W; kW; Btuh; Mbh; Tons
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This field specifies the rated heating capacity of the heat pump in heating mode according to the actual building heating load.
Rated Cooling Capacity
Default: Auto Sized
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Typical Range: 7,000 – 240,000 Btuh
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Min Max: 0 < X < 100,000,000,000,000
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Units: W; kW; Btuh; Mbh; Tons
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This field specifies the rated cooling capacity of the heat pump in cooling mode according the actual building cooling load.
Rated Cooling Full Load Energy Rate
Default: 3.77 COP
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Typical Range: 2.9 – 3.2 COP
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Min Max: 0.11 < X < 2,999,999,999
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Units: COP; EER; KW/KW; KW/MBh; KW/ton; MBh/ton; therms/(ton-hr)
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This field specifies the full load energy rate of the heat pump unit for rated conditions at the highest operating speed for cooling mode. The energy rate should account for the compressor, condenser fan, and accessories, but exclude the supply air fan.
Rated Heating Full Load Energy Rate
Default: 2.9 COP
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Typical Range: N/A
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Min Max: 0.11 < X < 1,000,000,000
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Units: COP; EER; KW/KW; KW/MBh; KW/ton; MBh/ton; therms/(ton-hr)
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This field specifies the full load energy rate of the heat pump unit for rated conditions at the highest operating speed for heating mode. The energy rate should account for the compressor, condenser fan, and accessories, but exclude the supply air fan.
Rated Heating Airflow Rate
Default: Auto Sized
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Typical Range: N/A
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Min Max: 0 < X < 100,000,000,000,000
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Units: ACH; CFM; L/s; m3/hr; m3/s
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This field specifies the rated airflow rate corresponding to the design heating capacity. This design airflow rate is used to determine the airflow rates at various speed levels if they exist.
Rated Cooling Airflow Rate
Default: Auto Sized
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Typical Range: N/A
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Min Max: 0 < X < 100,000,000,000,000
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Units: ACH; CFM; L/s; m3/hr; m3/s
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This field specifies the rated airflow rate corresponding to the design cooling capacity. This design airflow rate is used to determine the airflow rates at various speed levels if they exist.
Hot Gas Reheat
Enable Hot Gas Reheat
Default: No
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Typical Range: N/A
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Min Max: N/A
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Units: N/A
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This field determines whether or not the Air to Air Heat Pump will model heat reclamation from the superheated refrigerant and gas leaving the compressor. The superheated refrigerant coil reheats the air downstream of the DX cooling coil.
Parasitic Electric Load
Default: 0
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Typical Range: N/A
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Min Max: 0 < X < 100,000,000,000,000
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Units: hp, kW, W
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This field specifies the parasitic electric load due to control valves or other devices specific to the hot gas reheat coil operation. The load is applied whenever the coil is heating the air. Note that the electric load is small and does not contribute to the reheat.
Heat Reclaim Efficiency
Default: 0
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Typical Range: 25% to 30%
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Min Max: 0 < X < 30
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Units: hp, kW, W
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This field defines the ratio of recovered waste heat from the superheated refrigerant gas to the total rejected waste heat from the heat pump (as if no heat reclamation occurred).
Dehumidification
Dehumidification Control Type
Default: None
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Typical Range: None, Cool Reheat
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Min Max: N/A
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Units: N/A
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This field determines the type of dehumidification control. The following options are valid for this field:
None - meet sensible load only, no active dehumidification control. If the system control type is SingleZoneVAV then dehumidification control must be set to None. In order to apply a dehumidification control strategy make sure to add a relative humidity sensor in the Configure Systems system schematic.
If the dehumidification control type is specified as CoolReheat, the DX coil will cool beyond the dry-bulb temperature set point as required to meet the high humidity setpoint. The reheat coil will then heat the supply air back to dry bulb setpoint.
Condensate
Evaporation Ratio
Default: 0
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Typical Range: N/A
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Min Max: 0 < X < 100,000,000,000,000
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Units: N/A
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This field determines the ratio of the initial moisture evaporation rate from the cooling coil (when the compressor first turns off) and the coil’s steady-state latent capacity at rated airflow and temperature conditions. A value of zero means the latent degradation model is disabled.
Time for Condensate to Begin
Default: 0
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Typical Range: N/A
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Min Max: 0 < X < 100,000,000,000,000
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Units: s
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This field determines the nominal time after startup for condensate to begin leaving the coil’s condensate drain line at the coil’s rated airflow and temperature conditions. The nominal time is equal to the ratio of the energy of the coil’s maximum condensate holding capacity (J) to the coil’s steady-state latent capacity (W).
Crankcase Heater
Crankcase Outdoor DB Limit
Default: 50°F, 10°C
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Typical Range: N/A
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Min Max: 0 < X < 100,000,000,000,000
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Units: °F; °C
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This field determines the outdoor air dry-bulb temperature above which the compressor crankcase heater is disabled.
Crankcase Heater Capacity
Default: 0 W
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Typical Range: N/A
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Min Max: 0 < X < 100,000,000,000,000
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Units: Btuh; kW; MBh; W
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This field determines the compressor crankcase heater capacity. The crankcase heater is enabled for any time when the outdoor air dry bulb temperature is below the Crankcase Outdoor DB Limit and the compressor is not running. To simulate a unit without a crankcase heater, enter a value of 0.
Defrost Heating Mode
Defrost
Default: Resistive
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Typical Range: Resistive, Reverse Cycle
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Min Max: N/A
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Units: N/A
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This field determines the defrost strategy for melting frost that may accumulate on the condenser coil. The two methods for defrosting are Reverse Cycle and Resistive. The Reverse Cycle method means the heating cycle is periodically reversed in order to melt the frost on the condenser coil. If instead the resistive strategy is used, frost is melted using an electric resistance heater.
Resistive Heater Capacity
Default: Auto Sized
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Typical Range: N/A
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Min Max: 0 < X < 100,000,000,000,000
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Units: Btuh; kW; MBh; tons, W
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This field defines the capacity of the electric resistance heater if the Resistive method is chosen for the Defrost Heating Mode.
Defrost Control
Default: OnDemand
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Typical Range: OnDemand, Timed
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Min Max: N/A
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Units: N/A
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This field determines how often defrost control occurs via either the OnDemand or Timed method. If the OnDemand method is chosen the defrost time period is calculated based on outdoor humidity ratio. If instead the Timed method is chosen then the defrost time period is based on a fixed value whether or not frost has actually accumulated.
Defrost Time Fraction
Default: 0.058333
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Typical Range: N/A
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Min Max: 0 < X < 1,000,000,000,000,000
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Units: N/A
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This field determines the fractional amount of time the unit is in defrost mode if Timed Defrost Control has been selected.
Max ODB Limit
Default: 32°F, 0°C
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Typical Range: N/A
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Min Max: -13 < X < 100,000,000,000,000
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Units: °F, °C
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This field determine the outdoor dry bulb temperature above which the heat pump will no longer enable defrost mode. This field pertains to either the OnDemand or Timed Defrost Control Method.
Min. ODB Limit
Default: 17.6°F
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Typical Range: N/A
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Min Max: -13 < X < 100,000,000,000,000
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Units: °F, °C
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This field determines the temperature below which the compressor will no longer operate.