MIL-HDBK-1003/3
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 mixed air low limit temperature
controller manual-automatic switch to the manual position.
Perform the two-point calibration accuracy check of sensing
element-to-controller readout. Index the mixed air low limit
temperature controller manual-automatic switch to the automatic
position. Change the controller output to open the preheat coil
valve slightly. Perform the controller tuning procedure. Set
the controller at the predetermined temperature setpoint. Apply
the economizer mode input signal, and observe that the outside
air, return air, and relief air dampers are under control. Index
the supply air low limit temperature controller manual-automatic
switch to the manual position. Perform the two-point calibration
accuracy check of sensing element-to-controller readout. Index
the supply air low limit temperature controller manual-automatic
switch to the automatic position. Change the controller output
to open the heating coil valve slightly. Perform the controller
tuning procedure. Set the controller at the predetermined
temperature setpoint. Index the room 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.
(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
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