Trane Tracer AH540 Setup And Operation page 89

Table 44. Discharge air temperature control setpoint configuration
Setpoints and limits
Discharge air temperature cooling setpoint
Discharge air temperature heating setpoint
Discharge air temperature cooling setpoint high limit
Discharge air temperature cooling setpoint low limit
Discharge air temperature heating setpoint high limit
Discharge air temperature heating setpoint low limit
Table 45. Daytime warm-up setpoint configuration
Parameter
Daytime warm-up start setpoint
Daytime warm-up termination setpoint
1
When the space temperature is below the daytime warm-up start setpoint, the daytime warm-up sequence is initiated.
2 When the space temperature is above the daytime warm-up stop setpoint, the daytime warm-up sequence is terminated.
Table 46. Duct static pressure setpoint and limit configuration
Parameter
Duct static pressure high limit
Duct static pressure setpoint
Duct static pressure setpoint high limit
Duct static pressure setpoint low limit
1 This is the pressure at which the controller shuts down the unit to prevent duct damage.
Table 47. Mixed-air temperature control configuration
Parameter
Mixed-air low limit setpoint
Mixed-air control sequence
3
Pre-ventilation setpoint
1 If the mixed-air temperature reaches this low limit setpoint, the controller uses the configured mixed-air control sequence to
maintain mixed-air temperature above the configured mixed-air low limit setpoint.
2 The Tracer AH540/541 controller can be configured three different ways to control mixed-air temperature above the mixed-air
low-limit temperature. If none is selected, the controller does not attempt to prevent low mixed-air temperature conditions. Low
temperature detect provides unit freeze protection from freezestat binary input IN7. Mixed-air control reduces the outdoor air
damper minimum position to maintain mixed-air temperature. The mixed-air preheat control sequence first attempts to use
preheat (if available) to maintain mixed-air temperature above the low limit temperature. If preheat capacity cannot maintain
the air-handling unit's mixed-air temperature above the configured mixed-air low limit temperature, the controller lowers the
outdoor air damper below its minimum ventilation position.
3 If discharge air temperature or mixed-air temperature is less than the pre-ventilation setpoint, heating capacity is energized
early in the unit start-up process.
CNT-SVX05B-EN
1
2
1
1 -4°F to 104°F (-20°C to 40°C)
• None
2
• Mixed-air control
• Mixed-air preheat control
32°F to 86°F (0°C to 30°C)
Valid range
32°F to 86°F (0°C to 30°C)
50°F to 158°F (10°C to 70°C)
32°F to 86°F (0°C to 30°C)
32°F to 86°F (0°C to 30°C)
32°F to 158°F (0°C to 70°C)
32°F to 158°F (0°C to 70°C)
Valid range
40 to 87.0°F (4.4 to 30.6°C)
43 to 90°F (6.1 to 32.2°C)
Valid range
0 to 5 inH O (0 to 1250 Pa)
2
0 to 5 inH O (0 to 1250 Pa)
2
0 to 5 inH O (0 to 1250 Pa)
2
0 to 5 inH O (0 to 1250 Pa)
2
Valid range
Configuration
Default value
55°F (12.8°C)
100°F (37.8°C)
68°F (20°C)
44.6°F (7°C)
104°F (40°C)
86°F (30°C)
Default value
62°F (16.7°C)
71°F (21.7°C)
Default value
4 inH O (1000 Pa)
2
1.5 inH O (375 Pa)
2
3 in H O (750 Pa)
2
0.5 inH O (125 Pa)
2
Default value
48°F (8.9°C)
Dependent on air-handler type
48°F (8.9°C)
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