MIL-HDBK-1003/3
dampers are closed, the return air damper is open, and the
heating coil valve and preheat coil valve (cooling coil valve)
are in the warm-up (cool down) position. Change the command to
occupied mode and observe that the outside air damper, return air
damper, relief air damper, heating coil valve, preheat coil
valve, and chilled water valve are in control, by changing the
controller output.
(2) Apply the minimum outside air mode signal.
Observe that the outside air damper opens to the minimum
position.
(3)
Index the cold deck coil temperature
controller manual-automatic switch to the manual position, and
perform the two-point calibration accuracy check of sensing
element-to-controller readout. Index the controller
manual-automatic switch to the automatic position, and perform
the controller tuning procedure. Set the controller at the
temperature setpoint as shown. Index the mixed air low limit
temperature controller manual-automatic switch to the manual
position. Change the controller output to open the preheat coil
valve slightly. Perform the two-point calibration accuracy check
of sensing element-to-controller readout for outside air, return
air, and mixed air temperatures. Index the mixed air low limit
temperature controller manual-automatic switch to the automatic
position. Apply the economizer mode input signal, and observe
that the outside air, return air, and relief air dampers are
under control. Perform the controller tuning procedure. Set the
controller at the predetermined temperature setpoint.
(4) Apply an unoccupied mode signal, and observe
that the HVAC system shuts down, and the control system assumes
the specified shutdown conditions. Raise the night thermostat
temperature setting and observe that the HVAC system starts.
Lower the setting and observe that the HVAC system stops. Set
the night thermostat at the predetermined setting.
(5) With the HVAC system running, simulate a
filter differential pressure switch input signal at the device.
Observe that the filter alarm is activated. Set the differential
pressure switch at the predetermined setpoint.
(6) With the HVAC system running, simulate a low
temperature condition at the freezestat. Observe HVAC system
shutdown and that the low temperature alarm is activated. Set
the thermostat at the predetermined setpoint. Restart the HVAC
system by manual reset, and observe that the alarm is
deactivated.
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