![background image](http://html1.mh-extra.com/html/trane/vav-ucm-4-2/vav-ucm-4-2_installation-and-maintenance-manual_1149794038.webp)
38
VAV-SVX01C-EN
UCM Programming and Operation
defaults (cooling high limit = 102°F (38.8°C), heating low limit = 43°F (6.1°C)) should prevent
them from impacting field operation.
High Limit:
This limit applies to the occupied mode only starting in UCM version 4.1. Prior to
version 4.1, the limits would affect both the unoccupied and occupied setpoints. Both limits
have a range of 30.0°F - 100.0°F (-1.1°C - 37.8°C). The set point limits will be applied to the active
heating set point by the UCM but will not restrict operator entry of set points.
Flow
Minimum:
Although the UCM will read flow down to 5% of cataloged, the range of MIN FLOW
settings is 0%, or 10% to 100% of cataloged. The UCM will not drive its flow below this minimum
flow value under normal operating conditions while in the cool mode. Cool mode occurs when
cool air is in the supply duct. The entry in the Cooling Minimum field must be less than or equal
to the entry in the
Maximum
field.
Maximum:
This range is 10% to 100% of the unit's cataloged CFM size. Cooling and heating
flow can be edited to zero.The UCM will not drive its flow above this maximum flow value under
normal operating conditions while in the Cool mode. Cool mode occurs when cool air is in the
supply duct. The entry for Maximum Flow must be greater than or equal to the entry in any of
the Minimum fields.
Min Heating:
The UCM will not drive its position/flow below this value under normal operating
conditions while in the HEAT mode (warm air in the supply duct) or while it is using local heat.
The Min Heating Flow value must be less than or equal to the Maximum Flow value.
Min Local Heat:
If the Min Local Heat flow is enabled, then the Min Local Heat flow is used
to determine the minimum position/flow instead of the Min Heating Flow when local heat is on.
The entry for Min Heating Flow must be less than or equal to the entry for the Maximum Flow.
Outdoor Air Required
Occupied:
The UCMs use these values to calculate the ventilation ratio. Valid range: 0 to 100%.
Unoccupied:
The UCMs use these values to calculate the ventilation ratio. Valid range: 0 to
100%.
Offsets
Heat Offset:
This is the value subtracted from the cooling thumbwheel setpoint to derive the
heating setpoint. This defines the minimum difference between the cooling and heating
setpoints. Valid Range: 2°F to 10°F.
Control Offset:
When control offset is active, the UCM adds the value to the edited occupied
cooling setpoint and subtracts the control offset value from the edited occupied heating
setpoint to determine the active setpoints. The control offset value does not affect a zone sensor
thumbwheel setpoint.
Fan Control Setpoint
The entry on this line determines when a parallel fan will be turned ON and OFF. If "Parallel fan
control" has been edited to "DEG" the fan control offset will be entered as a temperature offset (2°
- 10°F) (1.1°C - 5.5°C) which will be added to the heating set point. If "Parallel fan control" has been
edited to "FLOW" this line will be entered as a percent (0 to 100%) if the unit is a VariTrane unit. The
entry field on this line will appear as "-" if the unit does not have a parallel fan.
Important:
This field is visible ONLY with Parallel Fan Powered units.
Table 8.
Valid flow ranges (by model)
VariTrane C
0, 10-150%
VariTrane D
0, 10-110%
VariTrane F
0, 10-100%
Содержание VAV-UCM 4.2
Страница 1: ...May 2010 VAV SVX01C EN Installation Operation Maintenance VAV UCM 4 2...
Страница 81: ...VAV SVX01C EN 81 Troubleshooting Figure 46 Single duct with single phase voltage electric heat...
Страница 82: ...82 VAV SVX01C EN Troubleshooting Figure 47 Single duct with three phase voltage electric heat...
Страница 83: ...VAV SVX01C EN 83 Troubleshooting Figure 48 SCR PSC fan powered with single phase voltage electric heat...
Страница 84: ...84 VAV SVX01C EN Troubleshooting Figure 49 SCR PSC fan powered with three phase voltage electric heat...
Страница 85: ...VAV SVX01C EN 85 Troubleshooting Figure 50 ECM fan powered with single phase voltage electric heat...
Страница 86: ...86 VAV SVX01C EN Troubleshooting Figure 51 ECM fan powered with three phase voltage electric heat...