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7
IM 1040 • VAV ACTUATOR
Setting flow coefficient
1.
Set FLOW COEFF to the appropriate value found in
Table 6. This value is a starting point for the air balancer.
2.
To fine tune the flow coefficient use the following formula:
new flow coefficient = (actual volume / TEC volume)
× old flow coefficient
The actual volume is the actual value obtained from the
balancer’s measurements. The TEC volume is the value
obtained from AIR VOLUME.
3.
If the TEC volume is not within 5% of the actual volume,
repeat the procedure until it is within 5%.
Table 7:
Box Manufacturer Flow Coefficients.
Manufacturer
Sensor Tpe
Value
Anemostat
2-pipe without orifice
0.79
2-pipe with orifice
0.59
Spider without orifice
0.73
Spider with orifice
0.39
Carnes
2-pipe
065
Flow cross
0.59
Carrier
0.59
E.H. Price/Siemens Industry Lab Terminal Boxes
0.78
Environmental Technologies
0.79
Krueger
0.68
Metal Aire
0.72
Nailor Industries
0.69
Titus
0.60
Trane
0.66
Setting airflow setpoints
CAUTION
If using electric heat in a unit without a terminal fan, do not set
HTG FLOW MIN to 0 (zero). Equipment damage may occur at
0 (zero) CFM with electric heat ON.
NOTICE
Maximum flow(s) must be set ≥ minimum flow(s).
NOTICE
For Applications 2562, 2563, 2564, and 2566, HTG FLOW
MAX should be less than CLG FLOW MAX. Otherwise, cold
supply air may cool rather than heat the space in heating
mode. A typical setting for HTG FLOW MAX is 50% or less of
CLG FLOW MAX.
1.
Set CLG FLOW MIN to the desired minimum cooling
airflow setpoint.
2.
Set CLG FLOW MAX to the desired maximum cooling
airflow setpoint.
Applications 2561 - 2567:
1.
Set HTG FLOW MIN to the desired minimum heating
airflow setpoint.
2.
Set HTG FLOW MAX to the desired maximum heating
airflow setpoint.
Setting room temperature offset
(optional)
NOTICE
The Room Temperature Offset feature is optional.
When the room has stabilized to within 5°F, take a precision
temperature reading at the room temperature sensor, record
any difference between this reading and the value of ROOM
TEMP and set this difference value (to the nearest 0.25°F) into
RMTMP OFFSET.
Example:
If the actual room temperature is 72.0°F, and the value of
ROOM TEMP is 73.0°F, then the value entered into RMTMP
OFFSET is –1.0. In this case, the value of ROOM TEMP would
read 73.0°F, but the value of CTL TEMP would read 72.0°F.
CTL TEMP = ROOM TEMP + RMTMP OFFSET
Summary of Contents for BACnet
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