Unit installation
Controls
70 SCXF-SVX01K-EN
If the static pressure range is 0.0-5.0 iwc:
IPV = (SP)(0.8) + 0.5
SP = [IPV/(0.8 + 0.5)]
GBAS Demand Limit Relay (Binary Input)
The GBAS allows the unit to utilize the demand limit
function by using a normally open (N.O.) switch to limit the
electrical power usage during peak periods. Demand limit
can initiate by a toggle switch closure, a time clock, or an
ICS control output.These contacts must be rated for 12 ma
@ 24 VDC minimum.
When the GBAS module receives a binary input signal
indicating demand limiting is required, a command
initiates to either partially (50%) or fully (100%) inhibit
compressor and heater operation.This can be set at the HI
using the setup menu, under the “demand limit definition
cooling” and “demand limit definition heating” screens. A
toggle switch, time clock, or building automation system
control output can initiate demand limiting.
If the cooling demand limit is set to 50%, half of the cooling
capacity will disable when the demand limit binary input
closes.The heating demand limit definition can only be set
at 100%, unless the unit has field-provided two-stage
electric heat. In that case, if the heating demand limit is set
to 50%, half or one stage of heating disables when the
demand limit binary input closes. If the demand limit
definition is set to 100%, then all cooling and/or heating
will disable when the demand limit input closes.
GBAS Diagnostics (Binary Outputs)
The GBAS can signal up to five alarm diagnostics, which
are fully mappable through the setup menu on the HI.
These diagnostics, along with the alarm output on the
RTM, allow up to six fully mappable alarm outputs.
Each binary output has a NO and NC contact with a rating
of two amps at 24 VAC.The five binary outputs are factory
preset as shown on the unit wiring diagram (on the unit
control panel door). However, these outputs can be field
defined in a variety of configurations, assigning single or
multiple diagnostics to any output.
For a complete listing of possible diagnostics, see the
IntelliPak Self-Contained Programming Guide, PKG-
SVP01B-EN. For terminal strip locations, refer to the unit
wiring diagram for the GBAS.
Input Devices and System
Functions
Following are basic input device and system function
descriptions used within the UCM network on IntelliPak™
self-contained units. Refer to the unit wiring diagrams for
specific connections.
Water Purge
During the unoccupied mode, water-cooled units will
periodically circulate water through the condensers and
Table 44. GBAS analog input setpoints
Control Parameter
Signal Range
VDC
Setpoint Range
°F
occupied zone cooling setpoint 0.5 to 4.5 50 to 90°F
(CV units only)
unoccupied zone cooling setpoint 0.5 to 4.5 50 to 90°F
(CV and VAV)
occupied zone heating setpoint 0.5 to 4.5 50 to 90°F
(CV units only)
unoccupied zone heating setpoint 0.5 to 4.5 50 to 90°F
(CV and VAV)
supply air cooling setpoint 0.5 to 4.5 40 to 90°F
(VAV units only)
supply air hydronic heating
setpoint
0.5 to 4.5 40 to 180 F
(VAV units only)
space static pressure setpoint 0.5 to 4.5 0.03 to 0.30 IWC
supply air pressure setpoint 0.5 to 4.5 0.0 to 5.0 IWC
(VAV units only)
Note:
1. Input voltages less than 0.5 vdc are considered as 0.5 vdc input signal is
lost, the setpoint will "clamp" to the low end of the setpoint scale. No
diagnostic will result from this condition.
2. Input voltages greater than 4.5 vdc are considered to be 4.5 vdc.
3. The actual measured voltage is displayed at the HI.
Table 45. GBAS input voltage corresponding setpoints
Volts
Temp.
°F Volts
Temp.
°F Volts
Temp.
°F Volts
Temp.
°F
0.5 50 1.6 60 2.6 70 2.7 80
0.6 51 1.7 61 2.7 71 2.8 81
0.7 52 1.8 62 2.8 72 2.9 82
0.8 53 1.9 63 2.9 73 3.0 83
0.9 54 2.0 64 3.0 74 3.1 84
1.0 55 2.1 65 3.1 75 3.2 85
1.1 56 2.2 66 3.2 76 3.3 86
1.2 57 2.3 67 3.3 77 3.4 87
1.3 58 2.4 68 3.4 78 3.5 88
1.5 59 2.5 69 3.5 79 3.6 89
NOTICE:
Proper Water Treatment!
The use of untreated or improperly treated water in
coils could result in scaling, erosion, corrosion, algae or
slime. It is recommended that the services of a
qualified water treatment specialist be engaged to
determine what water treatment, if any, is required.
Trane assumes no responsibility for equipment failures
which result from untreated or improperly treated
water, or saline or brackish water.
Table 44. GBAS analog input setpoints (continued)
Control Parameter
Signal Range
VDC
Setpoint Range
°F