WattMaster VAV System - Manual (Page 20)

Technical Guide
Operator Interfaces 20
Setpoint Screen #23
WMVAV Spts ID 59
Push-Button Override
Duration....: x.x Hr
If the Space Temperature sensor contains the optional push-button over-
ride then this is the amount of time the unit will revert to occupied
operation whenever the button is pressed during the unoccupied mode.
Description Minimum Default Maximum
Duration 0.0 Hr 2.0 Hr 8.0 Hr
Setpoint Screen #24
WMVAV Spts ID 59
Slide Offset Sensor
Setpoint....: x
° F
If Space Temperature is used as the controlling sensor for the HVAC
unit and it is supplied with the optional Setpoint Slide Adjust, this is
the maximum amount the user can adjust the heating and cooling set-
points up or down as the slide is moved from the center position to its
full up or down position.
Description Minimum Default Maximum
Slide Offset Setpoint 0
°
F 0
°
F 6
°
F
Setpoint Screen #25
WMVAV Spts ID 59
Air to Air Heat Pump
Delay Before Using
Aux Heating.: xx M
If you configured this air handler to control as an Air to Air Heat Pump
unit and you have auxiliary heating on this unit, you can adjust how
long the unit uses the compressor to attempt to provide heating before
it activates the Aux Heat to supplement the compressor.
Note: On Air to Air Heat Pumps you must configure one of the
relays to be used as the Reversing Valve. This output is
active anytime the unit is in the heating mode and this
mode is the only time the Aux Heat will be activated, if
needed.
Description Minimum Default Maximum
Aux Heating Delay 0 Min 3 Min 30 Min
Setpoint Screen #20
WMVAV Spts ID 59
AHU Scheduled By
Schedule Number: x
0=AHU 1-7=Scheduler
Normally, the HVAC unit will use its own internal time clock and week
schedules to set the occupied mode of operation. If you have several air
handlers you can connect an external scheduling device to the commu-
nications loop and program the air handler for the desired schedule to
follow. If the HVAC unit is using its internal schedule, enter a ‘0’ for the
Schedule Number.
Description Minimum Default Maximum
Schedule Number 0 0 1 to 7
Setpoint Screen #21
WMVAV Spts ID 59
Maximum Economizer
Position if High CO2
Level Occurs.: xxx %
If you have configured the air handler to read a CO
2
sensor, it will
override the minimum economizer position up to this position if the
CO
2
level rises above its setpoint by the adjustable Reset Rng amount.
See Setpoint Screen #22.
Note: Minimum Position determined by user adjustable Min
Position Setpoint on Setpoint Screen #13.
Description Minimum Default Maximum
Max Position See Note 100% 100%
Setpoint Screen #22
WMVAV Spts ID 59
CO2 Protection Limit
Max Level.: xxxx PPM
Reset Rng.: xxxx PPM
If you configure the air handler to read a CO
2
Sensor, the Max Level is
the point at which the economizer minimum position starts to reset
upward. As the CO
2
level rises above the Max Level by the Reset Rng
amount, the economizer will have reset its minimum position propor-
tionally up to the previously defined economizer maximum damper
position setpoint.
Description Minimum Default Maximum
Max Level 0 PPM 900 PPM 5000 PPM
Reset Rng 0 PPM 100 PPM 1000 PPM
Programming The WMVAV Controller