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Step 5: Set the SMC55-HWQS Advanced Parameters to Modify the
Functionality of the HVAC System
Parameters Applicable for 2-pipe Fan Coil Units
This section lists out the details of the advanced configuration parameters applicable to 2-Pipe Fan Coil Units.
(40A) Change Over to Heat for Pipe Temperature
Use this parameter to indicate the temperature at which the operating mode of a 2-pipe FCU changes to heating. This is
applicable only if a value of '03: Changeover' is selected for a basic configuration parameter (10b) is used.
(41A) Change Over to Cool for Pipe Temperature
Use this parameter to indicate the temperature at which the operating mode of a 2-pipe FCU changes to cooling. This is
applicable only if a value of '03: Changeover' is selected for a basic configuration parameter (10b).
(42A) Enable Purge Function
Use this parameter to indicate whether or not to turn the valves on to refresh the temperature of the pipes when left dormant. Set
this parameter to '00' to disable. Set this parameter to '01' to enable the purge functionality.
(43A) Purge Valve On-Time
Use this parameter to indicate the number of minutes for which the valve should be left open during the purge. Set this to '00' if
the purge functionality is disabled in (42A).
(44A) Purge Valve Off-Time
Use this parameter to indicate the number of minutes to leave the valve closed in between the purges. Set this to '00' if the
purge functionality is disabled in (42A).
Parameters Applicable to a FCU with Multi-Speed Fan
This section lists out the details of the advanced configuration parameters applicable to a FCU with multi-speed fan.
(05A) Fan High Differential
Use this parameter to indicate the difference between the measured room temperature and the setpoint temperature when the
fan speed switches from 'Medium' to 'High' in Auto mode.
(09A) Kick-Start Fan
Use this parameter to indicate whether or not the fan should turn on at 'High' speed when turning on for the first time. Set this
parameter to '00' to disable. Set this parameter to '01' to enable the fan to turn on at high speed for 1 second.
Once all the advanced parameters are configured, verify the values selected for each advanced parameter. To exit the Advanced
Configuration Mode once all of the values are verified, hold the
the current room temperature (3 seconds). The thermostat will enter normal operating mode as shown in the example in
Figure 13: Normal Operating Mode of the Thermostat
AUTO
Auto
On
Set
Set
(continued)
button until the button backlights flash and the display shows
28
P/N 032498h
Figure
14.
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