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AAON SS1079 User Manual

AAON SS1079
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VCC-X Operator Interface SD
VCC-X SETPOINTS
51
Setpoint Screen #39 - Supply Air Cutoffs -
Cooling/Heating
VCC-X Spts ID:#
Supply Air Cutoffs
Cooling: 40.0ºF
Heating: 150.0ºF
The VCC-X controller will temporarily disable Heating or Cooling
if while in Heating or Cooling Mode the Supply Air Temperature
rises above the SAT Heating Cutoff Setpoint or falls below the
SAT Cooling Cutoff Setpoint. See the VCC-X Controller Technical
Guide for detailed information on the Low and High Supply Air
Temperature Cutoff sequence of operation.
Description Minimum Default Maximum
Cooling SAT Cutoff 0ºF
(-17.7ºC)
40ºF
(4.5ºC)
100ºF
(37.7ºC)
Heating SAT Cutoff 0ºF
(-17.7
ºC)
150ºF
(65.5ºC)
250ºF
(121.1ºC)
Setpoint Screen #40 - Hot Water Valve
Protection Position
VCC-X Spts ID:#
Hot Water Valve
Protection Pos: 0%
If the Supply Fan is on and the Supply Air Temperature (SAT) falls
below the Low SAT Cutoff Setpoint for 1 minute, the Hot Water
Valve will move to this position. If the SAT rises 5°F above the Low
SAT Cutoff, the valve will return to normal operation. If the SAT
remains below the Low SAT Cutoff Setpoint for 10 minutes, the
unit will shut down and a Low SAT Cutoff Alarm will be generated.
If the Supply Fan is off or during Emergency Shutdown and the
Outdoor Air Temperature (OAT) falls below the Low Ambient Set-
point, the Hot Water Valve will move to this position. If the OAT
rises back above the Low Ambient Setpoint, the valve will return
to its normal position.
If this setpoint is left at the default value of 0%, then the controller
will not initiate this protection sequence. For SCR heat this should
be left at 0%.
Description Minimum Default Maximum
Hot Water Valve
Protection Position
0% 0% 100%
Setpoint Screen #41 - Preheat Relay Setpoint
VCC-X Spts ID:#
Preheat Relay
Setpoint: 30.0ºF
For cold climates where freezing temperatures may be experienced,
a Pre-Heater relay output can be activated to control a preheat coil
based on the Outdoor Air Temperature to prevent freezing of Water
Coils. One of the VCC-X Relay Outputs must be con gured for the
Pre-Heater control. When con gured, any time the Outdoor Air Tem-
perature falls below the Preheat Setpoint during Occupied Mode and
the HVAC unit’s fan is running, the Pre-Heater relay will activate.
This setpoint will also be used to enable the PREHEAT-X Control-
ler if it is being used in conjunction with the VCC-X Controller.
IF the PREHEAT-X Controller is being used with the VCC-X Con-
troller, a relay on the VCC-X cannot also be con gured as Preheat
and energize for Preheat function.
Description Minimum Default Maximum
Preheat Setpoint -30ºF
(-34.4ºC)
30ºF
(-1.1ºC)
70ºF
(21.1ºC)
Setpoint Screen #42 - Low Ambient Setpoint
VCC-X Spts ID:#
Low Ambient
Setpoint: 30.0ºF
Similar to the Pre-Heat Relay, a Low Ambient Relay can be con g-
ured to energize anytime (during Occupied or Unoccupied Mode)
the Outdoor Air Temperature falls below this setpoint. The Low
Ambient Relay, though, can energize whether the fan is running or
not. This could be used to energize a boiler, for instance.
Description Minimum Default Maximum
Low Ambient Setpoint -30ºF
(-34.4
ºC)
30ºF
(-1.1ºC)
70ºF
(21.1ºC)
Setpoint Screen #43 - Heat Pump Defrost
Interval
VCC-X Spts ID 102
Heat Pump Defrost
Interval: 30 Min
If this is a heat pump unit with a Defrost Coil Temperature Switch
installed and con gured, a Heat Pump Defrost Mode is available.
If the Defrost Coil Temperature Switch closes during Heat Pump
Heating operation, the unit will enter the Defrost Mode for 10
minutes or until the Defrost Coil Temperature Switch opens. The
VCC-X Setpoint Screens

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AAON SS1079 Specifications

General IconGeneral
BrandAAON
ModelSS1079
CategoryController
LanguageEnglish

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