Commissioning Instructions

Before You Begin
Setting Override Time
8
Siemens Industry, Inc. Start-up Procedures 140-1199
Restricted 2015-05-06
– When the job specification requires a common heating and cooling temperature
setpoint, use the following configuration:
– Set DAY HTG STPT equal to DAY CLG STPT. This configures the setpoint
deadband equal to zero.
– If a setpoint deadband equals zero, then:
CTL STPT equals RM STPT DIAL, and is limited by RM STPT MIN and RM
STPT MAX.
NOTE: A space where the heating/cooling deadband is zero may be more
comfortable than a space where the deadband is being used; however, may
use more energy.
4. Set the room temperature setpoints to the desired values. Heating setpoints are not
present in cooling only applications.
Setting Override Time
If using night/unoccupied override, set OVRD TIME to the number of whole hours that
an override should last. If OVRD TIME equals 0 (default), this feature is disabled.
Setting Duct Area
If you do not know the duct area, use the following table:
Area =
Round Duct
Rectangular Duct
Area in Sq. Ft. ( π x R
2
)/144
( Where: π = 3.14 and R =
radius of duct in inches)
Width x Height/144
(in inches)
Area in Sq. M ( π x R
2
)/10,000
( Where: π = 3.14 and R =
radius of duct in centimeters)
Width x Height/10,000
(in centimeters)
Setting Flow Coefficient
1. Set FLOW COEFF to the appropriate value found in the following table. 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 ÷ Controller Volume) × Old Flow
Coefficient
The actual volume is the actual value obtained from the balancer’s
measurements. The controller volume is the value obtained from AIR
VOLUME.
3. If the controller volume is not within 5% of the actual volume, repeat Steps 1 and 2
until it is within 5%.