32
EconoMi$er IV
Table 5 provides a summary of EconoMi$er IV logic. Trouble-
shooting instructions are enclosed.
A functional view of the EconoMi$er system is shown in
Fig. 48. Typical settings, sensor ranges, and jumper positions
are also shown. An EconoMi$er IV simulator program is avail-
able from Carrier to help with EconoMi$er IV training and
troubleshooting.
ECONOMI$ER IV STANDARD SENSORS
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$er IV system can be used for free cooling. The sen-
sor is factory-installed on the EconoMi$er IV system in the
outdoor airstream. (See Fig. 49.) The operating range of tem-
perature measurement is 40°F to 100°F (4°C to 38°C). See
Fig. 51.
Supply Air Temperature (SAT) Sensor
The supply air temperature sensor is a 3 K thermistor located at
the inlet of the indoor fan. (See Fig. 49.) This sensor is factory
installed. The operating range of temperature measurement is
0°F to 158°F (–18°C to 70°C). See Table 6 for sensor tempera-
ture and resistance values.
Fig. 48 — EconoMi$er IV Functional View
* For single enthalpy control, the module compares outdoor enthalpy to
the ABCD set point.
† Power at N terminal determines Occupied/Unoccupied setting: 24 vac
(Occupied), no power (Unoccupied).
** Modulation is based on the supply-air sensor signal.
†† Modulation is based on the DCV signal.
*** Modulation is based on the greater of DCV and supply-air sensor
signals, between minimum position and either maximum position
(DCV) or fully open (supply-air signal).
††† Modulation is based on the greater of DCV and supply-air sensor
signals, between closed and either maximum position (DCV) or
fully open (supply-air signal).
Table 5 — EconoMi$er IV Input/Output Logic
INPUTS
OUTPUTS
Demand Control
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 Puron R-410A
Page 29: ...29 Fig 44 RTU Open Overlay for Economizer Wiring ...
Page 30: ...30 Fig 45 VFD Overlay for W2770 Controller Wiring ...
Page 50: ...50 Fig 63 50KC Typical Unit Wiring Diagram Power 06A 208 230 3 60 ...
Page 51: ...51 Fig 64 50KC Unit Wiring Diagram Control A06 ...
Page 77: ...77 Fig C Unit Wiring Diagram Power for Sizes A04 and A06 208 230 1 60 ...
Page 78: ...78 Fig D Unit Wiring Diagram Power for Size A05 208 230 1 60 ...
Page 79: ...79 Fig E Unit Wiring Diagram Power for Sizes A04 A06 208 230 3 60 460 3 60 575 3 60 ...