Remote Damper Position Potentiometer Wiring; Fire And Smoke Control Wiring - Carrier 48TM004-007 Installation, Start-Up And Service Instructions Manual

Fig. 33 — Remote Damper Position
Potentiometer Wiring
ECONOMISER2
ACTUATOR
RED
BLACK
WHITE
+
-
ECONOMISER2 CONTROLLER
24 VAC HOT
24 VAC COM
1K
1S
+
2K
2-10V
OUT
1S1
-
MINIMUM
POSITION
ADJUSTMENT
FREE MAXIMUM
COOL POSITION
ADJUSTMENT
UNIT
CONTROL
EXHAUST
FAN
INDOOR
FAN
Fig. 34 — Fire and Smoke Control Wiring
Dehumidification of Fresh Air with DCV Control — Infor-
mation from AHSRAE indicates that the largest humidity load
on any zone is the fresh air introduced. For some applications,
a device such as a 62AQ energy recovery unit is added to re-
duce the moisture content of the fresh air being brought into the
building when the enthalpy is high. In most cases, the normal
heating and cooling processes are more than adequate to re-
move the humidity loads for most commercial applications.
This makes the control of the of the dehumidification device
simple when using the enthalpy or differential enthalpy sensor.
The enthalpy sensor or differential enthalpy sensor is installed
on the equipment to determine economizer operation. The high
enthalpy signal from the enthalpy sensor or differential en-
thalpy sensor can be used to turn on the outdoor air moisture
removal device any time fresh air is required for the space.
The energy recovery device should be sized for maximum
latent and sensible conditioning at maximum ventilation on a
design day. A calculation for leaving-air temperature on a low
ambient, low ventilation day should also be done to determine
the mixed-air temperature of the return and pre-conditioned
outside air. The design should produce air temperature some-
what near room conditions to prevent reheat of the air mixture.
The energy recovery device should be interlocked with the heat
to turn off the device when in the heat mode.
BROWN
BLACK
TR1
TR
TAN
ECONOMISER2
820 OHM
+
S O
RESISTOR DRY BULB
VIOLET
SENSOR
+
S R
620 OHM
RESISTOR
BLACK
5
1 2
WHITE
Compressor Lockout N.C.
4
3
T T1
P P1
Q Q1
AQ
AQ1
FIRE AND SMOKE CONTROL
SD
SD1
AC1
AC
PG
PG1
24
4
3
GRAY
5
BLUE
2
YELLOW
8
VIOLET
6
PINK
7
1
10
11
9
12
HARNESS
SHUTDOWN
AND PLUG
AIR CHANGE
PURGE
BROWN
BLACK
GRAY
BLUE
YELLOW
VIOLET
PINK
RED
WHITE
BROWN
ORANGE