Functions - Trane Technologies IntelliPak Signature SCWF Installation, Operation And Maintenance Manual

Controls
Table 36. GBAS analog input setpoints (continued)
Control Parameter
Unoccupied zone heating setpoint (CV and VAV)
Supply air cooling setpoint (VAV units only)
Supply air hydronic heating setpoint (VAV units only)
Space static pressure setpoint
Supply air pressure setpoint (VAV units only)
Notes:
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 37. GBAS input voltage corresponding setpoints
Temp. °F
Volts
0.5 50
0.6 51
0.7 52
0.8 53
0.9 54
1.0 55
1.1 56
1.2 57
1.3 58
1.5 59
Input Devices and System Functions
Following are basic input device and system function
descriptions used within the UCM network on self-
contained units. Refer to the unit wiring diagrams for
specific connections.
Water Purge
NOTICE
Proper Water Treatment Required!
The use of untreated or improperly treated water
could result in scaling, erosion, corrosion, algae or
slime.
Use the services of a qualified water treatment
specialist 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.
During the unoccupied mode, water-cooled units will
periodically circulate water through the condensers and
waterside economizer if the user has enabled the purge
function at the HI. The water purge function circulates
water to introduce fresh water-treatment chemicals and
68
Temp. °F
Volts
1.6 60
1.7 61
1.8 62
1.9 63
2.0 64
2.1 65
2.2 66
2.3 67
2.4 68
2.5 69
Signal Range Vdc
0.5 to 4.5
0.5 to 4.5
0.5 to 4.5
0.5 to 4.5
0.5 to 4.5
Temp. °F
Volts
2.6 70
2.7 71
2.8 72
2.9 73
3.0 74
3.1 75
3.2 76
3.3 77
3.4 78
3.5 79
help prevent water stagnation. The number of hours
between each periodic purge, or purge duration, is user-
defined at the HI between 1-999 hours. If the periodic
purge timer expires while the unit is in occupied mode, it
will wait for the next available unoccupied time before
initiating water purge. Contrary, if a request for cooling
occurs during a purge sequence, purge will terminate and
cooling will commence.
Compressor Circuit Breakers
The Scroll Compressors are protected by circuit breakers
which interrupt the power supply to the compressors if the
current exceeds the breakers "must trip" value. During a
request for compressor operation, if the Compressor
Module detects a problem outside normal parameters, it
turns any operating compressor(s) on that circuit "Off",
locks out all compressor operation for that circuit, and
initiates a manual reset diagnostic.
Low Pressure Control
Low pressure (LP) control is accomplished using a binary
input device mounted on the suction line, near the
compressor. If suction pressure drops to 49 ± 6 psig, or
below, the switch opens.
Setpoint Range °F
50 to 90°F
40 to 90°F
40 to 180 F
0.03 to 0.30 IWC
0.0 to 5.0 IWC
Temp. °F
Volts
2.7 80
2.8 81
2.9 82
3.0 83
3.1 84
3.2 85
3.3 86
3.4 87
3.5 88
3.6 89
SCXF-SVX01T-EN