SystemAir TFC 225 P, Эксплуатация и обслуживание, Страница: 17 / 24

Installation | 13
4.2 Change from VAV to CAV
TFC 225 -TFC 560 are delivered as VAV- fans. The tubing is connected to - (minus) inlet on the controller.
All fans are also prepared with tubing for CAV (Constant air volume). The tubing is attached along the side of the casing
and loosely inserted in the electrical compartment. Change the function to CAV by replacing the connection to the con-
troller, the tubing from the bottom of the fan (1) to + (plus) inlet and the tubing from the cone (2) to - (minus).
The tubing from the cone is labelled with blue tape.
In BASE SETUP 5.01 in table 1, set the K-factor (see chapter 4.3). In SETTINGS, adjust the airflow for Setpoint 1, Setpoint
2 and Pband (nominal airflow x 2 recommended).
4.3 K-factor
Use the following equation to calculate the requested setting:
k ·
q =
p
q = airflow [m
3
/h]
k = k-factor
p= tuning pressure [Pa]
Model K-factor
TFC 225 57
TFC 280 79
TFC 355 134
TFC 450 212
TFC 500 289
TFC 560 554
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