Unit Operation
Figure 19: Vertical unit with
Upon
controller for standalone applica- tions.
When a unit uses
Table 22: Water assumption chart
point. Default minimum damper positions are provided and can be changed for occupied and occu- pied standby modes, or for low speed operation. The controller can also receive a communicated outdoor air damper minimum po- sition from Tracer Summit. A com- municated minimum position from Tracer Summit has priority over all configured setpoints.
During the OCCUPIED mode the outdoor air damper will always be controlled to the effective mini- mum position unless ASHRAE Cy- cle I, ASHRAE Cycle II, or economizing modes are active.
ibrates the
Unit Configuration
Temperature Assumed1
Hot
Cold
Hot
Cold
Figure 20: OA/RA actuator mounting for the vertical unit ventilator
Entering Water
Temperature
Sampling
Units with
1.Assumption based on absence of a valid entering water temperature
Modulating Outdoor Air Operation
The Tracer ZN.520 controller oper- ates a modulating
Figure 21: Figure 2: OA/RA actuator mounting for the horizontal unit ventilator
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