Orion System VCM-X/RNE Controller - Manual (Page 52)

VCM-X / RNE SETPOINTS
VCM-X / RNE Operator Interface SD 52
Setpoint Screen #28 - Preheat/ Low Ambient
Temperature
VCM-X / RNE Spts
Preheat/Low
Ambient Temperature
Setpoint: 0ºF
For cold climates where freezing temperatures may be experienced,
a Pre-Heater relay output can be activated based on the Outdoor Air
Temperature to prevent freezing of Water Coils. One of the VCM-X
/ RNE Relay Outputs must be confi gured for the Pre-Heater control.
When confi gured, if the Outdoor Air Temperature falls below the Low
OAT Ambient Protection Temperature Setpoint and the HVAC unit is
in Occupied Mode, the Pre-Heater relay will activate. This setpoint will
also be used to enable the Preheater if the PREHEAT-X Controller is
being used in conjunction with the VCM-X Controller.
Description Minimum Default Maximum
Preheat/Low Ambient
Temperature
0ºF 0ºF 70ºF
Setpoint Screen #29 - Max OA Damper
Tempering Limit
VCM-X / RNE Spts
Max OA Damper
Tempering Limit
Setpoint: 50%
The Maximum OA Damper Tempering Limit Setpoint allows you to
set the maximum damper position the economizer can open to while
the heat is running during the VAV Supply Air tempering mode in this
sequence (to prevent potential wasting of energy).
Description Minimum Default Maximum
Maximum Outdoor Air
Damper Tempering Limit
0% 50% 60%
Setpoint Screen #30 - HVAC Schedule
VCM-X / RNE Spts
HVAC Schedule...: 0
[ 0 = Internal ]
[1-5 = External ]
The VCM-X / RNE has an Internal Scheduler. If you want the VCM-X or
RNE to use its own Internal Schedule to schedule the HVAC unit, enter
<0> for Internal. To use the External Schedule option, you must have a
GPC Plus controller installed and operating on your system. To use one
of the (5) External Schedules available on the GPC Plus controller, enter
the number of the GPC Plus Schedule (1 through 5) you wish to use.
Description Minimum Default Maximum
HVAC Schedule 0 0 5
Setpoint Screen #31 - Push-Button Override
Duration
VCM-X / RNE Spts
Push-Button Override
Duration....: 2.0 Hr
If the Unit Controller has a Space Temperature Sensor installed and it has
the Override Button option, the HVAC unit will initiate Occupied Mode
any time the Override Button is pressed and held for less than 3 seconds.
The Push-Button Override Duration Setpoint allows you to adjust the
amount of time the Override will remain in effect when the Override
Button is pressed. To cancel the Override before the Override Duration
time period expires, press the Override Button for 5 to 10 seconds.
Description Minimum Default Maximum
Push-Button
Override Duration
0.0 Hr 2.0 Hr 8.0 Hr
Setpoint Screen #32 - HVAC Mode Sensor
Slide Offset
VCM-X / RNE Spts
HVAC Mode Sensor
Slide Offset: 0ºF
If the Unit Controller has a Space Temperature Sensor with the Slide
Adjust option installed, the HVAC Mode Enable Heating and Cooling
Setpoints can be offset by the HVAC Mode Sensor Slide Offset Setpoint
value. When the Slide Adjust bar is in the middle, no offset will occur.
If the Slide Adjust bar is moved all the way to the top of the Sensor, the
Heating and Cooling Setpoints will be raised by the Setpoint value you
have entered. If the Slide Adjust bar is moved all the way down to the
bottom of the Sensor, the Heating and Cooling Setpoints will be lowered
by the Setpoint value you have entered.
Description Minimum Default Maximum
HVAC Mode Sensor
Slide Offset
0ºF 0ºF 10ºF
Setpoint Screen #33 - Heat Pump Auxiliary
Heating Delay
VCM-X / RNE Spts
Heat Pump
Auxiliary Heating
Delay: 3 Min
If the Unit Controller is confi gured to operate as a Heat Pump, the Heat
Pump Auxiliary Heating Delay Setpoint can be confi gured to provide
a time delay period before Auxiliary Heating Stages can be activated
once activation of the Compressor Heating Stages have been initiated.
VCM-X / RNE Setpoint Screens