Bard W48A2PQ, Инструкция по установке и обслуживанию

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Manual 2100-642
Page 42 of 82
FIGURE 2.5
Free Cooling Damper Operation
Free cooling can take place providing the outside air meets three (3) separate criteria:
1. The dewpoint must be below 60°F
2. The relative humidity must be below 80%
3. The outside air must be cooler than the current setpoint.
With an accurate psychrometer, it is easy to pinpoint when the damper should be
open or closed during normal operations.
Below 60°F Dewpoint
Below 80% Relative Humidity
Description Default Setpoint
Temperature at local remote
(main) sensor
--
Temperature Setpoint 77°F
Heating Setpoint 60°F
Temperature High Limit –
Level 1
85°F
Temperature High Limit –
Level 2 (High Temp Alarm)
90°F
Temperature Low Limit 45°F
Cooling Stage Differential 5°F
Heating Stage Differential 2°F
Comfort Mode Setpoint 72°F
Comfort Mode Operation
Time
60 Minutes
Freecooling Setpoint 55°F
Lead/Lag Changeover Time
(Active/Standby Rotation)
1
Temperature Units °F
TABLE 2.2
Controller Default Settings