Orion System VCM-X/RNE Controller - Manual (Page 53)

VCM-X / RNE Operator Interface SD
VCM-X / RNE SETPOINTS
53
Description Minimum Default Maximum
Heat Pump
Auxiliary Heating Delay
0 Min 3 Min 30 Min
Setpoint Screen #34 - Heat Pump Defrost
Setpoints
VCM-X / RNE Spts
Heat Pump Defrost
Defrost Tmp: 30ºF
Defrost Tmr: 30 Min
The Defrost Temp Setpoint is the Coil Suction Temperature at which
the unit will go into Defrost Mode during Heat Pump Heating opera-
tion. This unit will operate in the Defrost Mode for 10 minutes or until
the Head Pressure reaches 450 PSI. The Defrost Timer determines the
length of time between Defrost Modes. The length of the Defrost Timer
can be automatically be adjusted by the Adaptive Defrost Adjustment
described in Setpoint Screen # 35. This Defrost Mode is only available
if using the VCM-X E-BUS Controller or RNE Controller and a Head
Pressure Module. A Suction Pressure Transducer is also required. This
screen only applies if using the VCM-X E-BUS Controller or RNE
Controller with a Suction Pressure Sensor, a Head Pressure Module,
and Head Pressure Transducer(s). This screen does not apply if using
the VCM-X WSHP Controller and a WSHP Module.
Description Minimum Default Maximum
Heat Pump Defrost Temp 0ºF 30ºF 50ºF
Heat Pump Defrost Timer 10 Min 30 Min 90 Min
Setpoint Screen #35 - Adaptive Defrost Adj.
Setpoint
VCM-X / RNE Spts
Adaptive Defrost
Adj. Setpoint: 0 MIN
Once initiated, the Defrost Mode is active until the Head Pressure reaches
450 PSIG or until a 10 minute timer has expired. Enter a value greater
than zero to enable the Adaptive Defrost Adjustment of the Heat Pump
Defrost Timer (Screen #34). This adjustment value will be subtracted
from the Heat Pump Defrost Timer if the Defrost Mode lasts the entire
10 minutes. A proportion of this adjustment value will be added to the
Heat Pump Defrost Timer if the Defrost Mode only lasts between 8
minutes and 0 minutes. This screen only applies if using the VCM-X
Modular Controller or RNE Controller with a Suction Pressure Sensor,
a Head Pressure Module, and Head Pressure Transducer(s). This screen
does not apply if using the VCM-X WSHP Controller and a WSHP
Protection Module.
Description Minimum Default Maximum
Adaptive Defrost Adj. 0 Min 0 Min 30 Min
VCM-X / RNE Setpoint Screens
Setpoint Screen #36 - Heat Wheel Defrost
VCM-X / RNE Spts
Heat Wheel Defrost
Setpoint: 32ºF
The unit will go into Heat Wheel Defrost Mode when the Outdoor Air
is below this setpoint.
Description Minimum Default Maximum
Heat Wheel Defrost 0ºF 32ºF 50ºF
Setpoint Screen #37 - Internal Schedule
Optimal Start Soak Multiplier
VCM-X / RNE Spts
Internal Schedule
Optimal Start Soak
Multiplier: 0.0
The Internal Schedule Optimal Start Soak Multiplier Setpoint is a multi-
plier that if set to a number greater than 0 will be used as a multiplier for
calculating the Optimal Start Time for the HVAC unit. This multiplier
is only applied if the unit has been off for more than 24 hours. See the
VCM-X Controller Technical Guide, VCM-X Modular E-BUS Controller
Technical Guide, or RNE Controller Technical Guide for more detailed
information regarding the Optimal Start. This multiplier is only applied
if you are using the Unit Controller Internal Schedule.
Description Minimum Default Maximum
Internal Schedule Optimal
Start Soak Multiplier
0.0 0.0 5.0
Setpoint Screen #38 - Trend Log Interval
VCM-X / RNE Spts
Trend Log
Interval: 15 MIN
An internal Trend Log is constantly updated at a rate equal to this value.
Description Minimum Default Maximum
Trend Log Interval 1 Min 15 Min 60 Min