![background image](http://html.mh-extra.com/html/carrier/weathermaker-50tc-17-30-series/weathermaker-50tc-17-30-series_service-and-maintenance-instructions_2562135037.webp)
37
EconoMi$er IV Standard Sensors
Table 9 provides a summary of EconoMi$er IV Logic. A function
-
al view of the EconoMi$er is shown in Fig. 52. Typical settings,
sensor ranges, and jumper positions are also shown. An
EconoMi$er IV simulator program is available from Carrier to
help with EconoMi$er IV system training and troubleshooting.
OUTDOOR AIR TEMPERATURE (OAT) SENSOR
The outdoor air temperature sensor (HH57AC074) is a 10 to
20 mA device used to measure the outdoor-air temperature. The
outdoor-air temperature is used to determine when the
EconoMi$er IV system can be used for free cooling. The sensor is
factory-installed on the EconoMi$er IV in the outdoor airstream.
(See Fig. 53.) The operating range of temperature measurement is
40°F to 100°F (4°C to 38°C). See Fig. 54.
*For single enthalpy control, the module compares outdoor enthalpy to
the ABCD set point.
†
Power at N terminal determines Occupied/Unoccupied setting: 24 vac
(Occupied), no power (Unoccupied).
**Modulation is based on the supply-air sensor signal.
††
Modulation is based on the DCV signal.
*** Modulation is based on the greater of DCV and supply-air sensor
signals, between minimum position and either maximum position (DCV)
or fully open (supply-air signal).
††† Modulation is based on the greater of DCV and supply-air sensor
signals, between closed and either maximum position (DCV) or fully
open (supply-air signal).
Fig. 52 —
EconoMi$er IV Functional View
Table 9 —
EconoMi$er IV Input/Output Logic
INPUTS
OUTPUTS
Demand
Controlled
Ventilation (DCV)
Enthalpy*
Y1 Y2
Compressor
N Terminal†
Outdoor
Return
Stage 1 Stage 2
Occupied
Unoccupied
Damper
Below set
(DCV LED off)
High (Free
Cooling LED off)
Low
On On
On
On
Minimum position
Closed
On Off
On
Off
Off Off
Off
Off
Low (Free
Cooling LED on)
High
On On
On
Off
Modulating** (between min.
position and full-open)
Modulating** (between closed
and full-open)
On Off
Off
Off
Off Off
Off
Off
Minimum position
Closed
Above set
(DCV LED on)
High (Free
Cooling LED off)
Low
On On
On
On
Modulating†† (between min.
position and DCV maximum)
Modulating†† (between closed
and DCV maximum)
On Off
On
Off
Off Off
Off
Off
Low (Free
Cooling LED on)
High
On On
On
Off
Modulating***
Modulating†††
On Off
Off
Off
Off Off
Off
Off
Summary of Contents for WeatherMaker 50TC 17-30 Series
Page 34: ...34 Fig 48 RTU Open Overlay for Economizer Wiring ...
Page 35: ...35 Fig 49 VFD Overlay for W2770 Controller Wiring ...
Page 80: ...80 Fig C 50TC 17 28 Control Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 81: ...81 Fig D 50TC 30 Control Wiring Diagram 208 230 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 82: ...82 Fig E 50TC 30 Control Wiring Diagram 460 3 60 575 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 83: ...83 Fig F 50TC 17 30 Power Wiring Diagram 208 230 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 84: ...84 Fig G 50TC 17 30 Power Wiring Diagram 460 3 60 575 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 89: ...89 Fig L 50TC PremierLink System Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 90: ...90 Fig M 50TC RTU Open Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 91: ...91 Fig N 50TC SAV VFD System Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 93: ......