58
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. 75.) This
sensor is factory installed. The operating range of
temperature measurement is 0
°
to 158
_
F (--18
_
to 70
_
C).
See Table 15 for sensor temperature/resistance values.
SUPPLY AIR
TEMPERATURE
SENSOR
MOUNTING
LOCATION
SUPPLY AIR
TEMPERATURE
SENSOR
C06033
Fig. 75 -- Supply Air Sensor Location
The temperature sensor looks like an eyelet terminal with
wires running to it. The sensor is located in the “crimp
end” and is sealed from moisture.
Outdoor Air Lockout Sensor
The EconoMi$er IV is equipped with an ambient
temperature lockout switch located in the outdoor
airstream which is used to lock out the compressors below
a 42
_
F (6
_
C) ambient temperature. (See Fig. 70.)
EconoMi$er IV Control Modes
IMPORTANT
: The optional EconoMi$er2 does not
include a controller. The EconoMi$er2 is operated by a 4
to 20 mA signal from an existing field-supplied controller
(such as PremierLink
™
control). See Fig. 72 for wiring
information.
Determine the EconoMi$er IV control mode before set up
of the control. Some modes of operation may require
different sensors. (See Table 22.) The EconoMi$er IV is
supplied from the factory with a supply--air temperature
sensor and an outdoor-- air temperature sensor. This allows
for operation of the EconoMi$er IV with outdoor air dry
bulb changeover control. Additional accessories can be
added to allow for different types of changeover control
and operation of the EconoMi$er IV and unit.
Outdoor Dry Bulb Changeover
The standard controller is shipped from the factory
configured for outdoor dry bulb changeover control. The
outdoor air and supply air temperature sensors are
included as standard. For this control mode, the outdoor
temperature is compared to an adjustable setpoint selected
on the control. If the outdoor-air temperature is above the
setpoint, the EconoMi$er IV will adjust the outside air
dampers to minimum position. If the outdoor-air
temperature is below the setpoint, the position of the
outside air dampers will be controlled to provided free
cooling using outdoor air. When in this mode, the LED
next to the free cooling setpoint potentiometer will be on.
The changeover temperature setpoint is controlled by the
free cooling setpoint potentiometer located on the control.
(See Fig. 76.) The scale on the potentiometer is A, B, C,
and D. See Fig. 77 for the corresponding temperature
changeover values.
C06034
Fig. 76 -- EconoMi$er IV Controller Potentiometer
and LED Locations
LED ON
LED ON
LED ON
LED ON
LED OFF
19
18
LED OFF
LED OFF
LED OFF
17
16
15
14
13
12
11
10
9
40
45
50
55
60
65
70
75
80
85
90
95 100
DEGREES FAHRENHEIT
mA
D
C
B
A
C06035
Fig. 77 -- Outside Air Temperature Changeover
Setpoints
0
5
10
15
20
25
30
0.13 0.20 0.22 0.25 0.30 0.35 0.40 0.45 0.50
STATIC PRESSURE (in. wg)
FLOW
IN
CUBIC
FEET
PER
MINUTE
(cfm)
C06031
Fig. 78 -- Outdoor--Air Damper Leakage
Differential Dry Bulb Control
For differential dry bulb control the standard outdoor dry
bulb sensor is used in conjunction with an additional
accessory
dry
bulb
sensor
(part
number
CRTEMPSN002A00). The accessory sensor must be
mounted in the return airstream. (See Fig. 79.) Wiring is
48TC
Summary of Contents for WeatherMaker 48TC*A04
Page 10: ...10 COOLING CHARGING CHARTS cont C08204 C08228 Fig 12 cont Cooling Charging Charts 48TC ...
Page 11: ...11 COOLING CHARGING CHARTS cont C08229 C08437 Fig 12 cont Cooling Charging Charts 48TC ...
Page 12: ...12 COOLING CHARGING CHARTS cont C08438 C08439 Fig 12 cont Cooling Charging Charts 48TC ...
Page 35: ...35 C08248 Fig 42 PremierLink Wiring Schematic 48TC ...
Page 43: ...43 C07129 Fig 59 RTU MP Multi Protocol Control Board 48TC ...
Page 44: ...44 44 C08458 Fig 60 RTU MP System Control Wiring Diagram 48TC ...
Page 64: ...64 C08308 Fig 83 48TC Typical Unit Wiring Diagram Power A06 208 230 3 60 48TC ...
Page 65: ...65 C08317 Fig 84 48TC Unit Wiring Diagram Control A06 48TC ...
