34
100
700
INSIDE/OUTSIDE CO
2
DIFFERENTIAL
AQ
DIFFERENTIAL
LOW (AQD.L)
AQ
DIFFERENTIAL
HIGH (AQD.H)
MINIMUM
IAQ
DAMPER
POSITION
(AQ. MN)
ECONOMIZER
MINIMUM
DAMPER
POSITION
(EC. MN)
INCREASING VENTILA
TION
VENTILATION FOR PEOPLE
VENTILATION FOR SOURCES
C07010
Fig. 22 -- IAQ Control
IA.CF = 3 (Control Minimum Position)
When
IA.CF
= 3
, an external 4 to 20 mA source is used to set the
minimum position. The 4 mA signal corresponds to 0% and the 20
mA signal corresponds to 100%. In this mode, configurations such
as
Configuration
→
AIR.Q
→
EC.MN
and
Configuration
→
AIR.Q
→
AQ.MN
are not used.
If the indoor fan is not operating, the economizer position will be
zero. The damper position may exceed the economizer minimum
position to provide economizer cooling.
IAQ (Switch Input)
Indoor air quality can also be measured using a switch input. For
the purpose of specifying the type of switch input, low CO
2
levels
are considered normal. The IAQ switch input is defined by the
configuration by
Configuration
→
AIR.Q
→
II.CF
IAQ Level
(Switch Input). Enthalpy and IAQ are controlled by the same
switch input and therefore they cannot be used simultaneously.
II.CF = 0 (No IAQ)
The
II.CF
= 0
configuration signifies that there is no IAQ switch
input. The damper will operate at the
EC.MN
position when the
space is occupied and the indoor fan is on.
II.CF = 1 (DCV NO) or II.CF = 2 (DCV NC)
The Demand Control Ventilation (DCV) allows the economizer
minimum position to be decreased when there is no IAQ problem.
If IAQ is low, the economizer minimum position is Minimum IAQ
Damper Position (
Configuration
→
AIR.Q
→
AQ.MN
). If IAQ is
high, the economizer minimum position is the Economizer
Minimum Position (
Configuration
→
AIR.Q
→
EC.MN
).
II.CF = 3 (Override NO) or II.CF = 4 (Override NC)
The damper override function permits absolute positioning of the
economizer damper for ventilation purposes. The override is active
when IAQ is high and inactive when IAQ is low. The override
position is configurable by the configuration by
Configuration
→
AIR.Q
→
OVR.P
(Economizer Override Position).
Outdoor Air Quality (Analog Input)
The
Comfort
Link
t
control is configured for outdoor air quality
sensors which provide 4 to 20 mA for 0 to 2000 ppm. If a sensor
has a different range, the ppm display range must be reconfigured
by entering new values for
Configuration
→
AIR.Q
→
O.4M
and
Configuration
→
AIR.Q
→
O.20M
.
OA.CF = 0 (No OAQ)
This signifies there is no outdoor air sensor installed. The default
value of
OAQ
is 400 ppm.
OA.CF = 1 (DCV)
The outdoor air quality sensor analog input is for the value of
OAQ
during demand control ventilation operation.
OA.CF = 2 (OAQ Lockout)
The outdoor air quality sensor analog input is only used to lock out
the outdoor ventilation. The economizer commanded position is set
to 0% when the ppm exceeds the OAQ lockout value configured
for
Configuration
→
AIR.Q
→
OAQ.L
. The default value of
OAQ.L
is 600 ppm.
48/
50P
G
and
P
M
Summary of Contents for 48/50PG Series
Page 32: ...32 C07009 Fig 20 Air Baffle Dimensions 48 50PG03 16 48 50PG and PM...
Page 33: ...33 C08077 Fig 21 Air Baffle Dimensions 48 50PG20 28 and 48 50PM16 28 48 50PG and PM...
Page 58: ...58 C08549 Fig 28 48PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 59: ...59 C08550 Fig 29 50PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 64: ...64 C08471 Fig 34 Typical 48PG and PM16 28 Control Schematic 48PM16 28 Shown 48 50PG and PM...
Page 66: ...66 C08557 Fig 36 Typical 50PG and PM16 28 Control Schematic 50PG20 28 Shown 48 50PG and PM...
Page 68: ...68 C08558 Fig 38 Typical 48 50PG and PM16 28 Power Schematic 48 50PM16 28 Shown 48 50PG and PM...
Page 72: ...72 C08565 Fig 42 Typical 48 50PG20 28 Component Arrangement 48 50PG20 24 Shown 48 50PG and PM...
Page 73: ...73 C08067 Fig 43 48 50PM16 28 Component Arrangement 48 50PG and PM...
Page 74: ...74 C08562 Fig 44 48 50PM16 28 with Humidi MiZert Component Arrangement 48 50PG and PM...
Page 208: ...208 48 50PG and PM...
