C7400A Solid State Enthalpy Sensor

C7400A Solid State Enthalpy Sensor
C7400A
Solid State Enthalpy Sensor
SPECIFICATION DATA
FEATURES
• Senses and combines temperature and humidity of
outdoor air.
• Long lasting solid state thermistor sensing element is
accurate and stable over time.
• As enthalpy of outdoor air increases, the outdoor air
damper closes to a preset minimum position.
• As enthalpy of outdoor air becomes low, the outdoor
air damper opens to reduce the cooling load in the
building.
• Maximum economizer savings is achieved when two
C7400A Solid State Enthalpy Sensors are connected
to one W7459 Solid State Economizer Control for
differential enthalpy changeover control.
APPLICATION
• Compact size and lightweight construction. Allows
easy mounting in HVAC rooftop unit.
The C7400A Solid State Enthalpy Sensor is used with the
W7459 Solid State Economizer Control Package. It permits
the use of outdoor air as the first stage of cooling in heating,
ventilating and air conditioning (HVAC) systems.
• Sensor is enclosed in a rugged, corrosion-resistant
glass-fiber reinforced plastic duct-mount case.
SPECIFICATIONS
Approvals:
Underwriters Laboratories Inc. Flammability Rating: UL94-5V.
Model:
C7400A Solid State Enthalpy Sensor.
Dimensions:
See Fig. 1
• Provides a 4 to 20 mA output signal to W7459 Solid
State Economizer Control; setpoint is located on solid
state economizer control.
Output Signal:
4 to 20 mA current signal increases from 4 mA to 20 mA as
enthalpy decreases.
5/16 (8)
Operating Ambient Temperature Range:
-25°F to +125°F (-32°C to +52°C).
3-5/32
(80)
Shipping Temperature Range:
-40°F to +150°F (-40°C to +66°C).
+
S
2-3/4
(70)
Maximum Power Consumption:
0.45 VA.
Supply Voltage:
18-24 Vdc.
Electrical Connections:
Two 1/4 in. (6 mm) quick connect terminals.
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • All Rights Reserved
9/16
(14)
1 (25)
7/32
(6)
3-7/8 (96)
M9096
Fig. 1. Approximate dimensions of C7400A Solid State
Enthalpy Sensor in in. (mm).
63-1143-1
C7400A SOLID STATE ENTHALPY SENSOR
C7400/W7459 Performance Curves:
See Fig. 2.
NOTE: Curves illustrate reset in temperature control point
due to changes in relative humidity.
46
85
90
95 100 105 110
(29) (32) (35) (38) (41) (43)
44
CONTROL CONTROL POINT
CURVE
APPROX. °F (°C)
AT 50% RH
A
73 (23)
B
70 (21)
C
67 (19)
D
63 (17)
(%
)
RE
LA
TIV
EH
UM
IDI
TY
38
75
(24)
R
PE
30
22
60
70
80
65
(18)
10
0
90
28
—
BT
U
70
(21)
24
EN
TH
AL
26 PY
32
34
PO
UN
D
36
DR
Y
AI
R
40
42
80
(27)
20
50
60
(16)
40
A
16
14
50
(10)
12
45
(7)
30
18
55
(13) B
C
20
D
40
(4)
10
35
(2)
1
B A
D C
35
(2)
40
(4)
45
(7)
50
(10)
55
60
65
70
75
80
85
90
95 100 105 110
(13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43)
APPROXIMATE DRY BULB TEMPERATURE—°F (°C)
1
HIGH LIMIT CURVE FOR W6210D,W7210D,W7459D.
M11160
Fig. 2. Partial psychometric chart with single C7400 Solid State Enthalpy Sensor and
W7459 Solid State Economizer Control performance curves.
Home and Building Control
Honeywell Inc.
Honeywell Plaza
P.O. Box 524
Minneapolis MN 55408-0524
Home and Building Control
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
M2H 2C9
Honeywell Latin American Division
Miami Lakes Headquarters
14505 Commerce Way Suite 500
Miami Lakes FL 33016
Honeywell Europe S.A.
3 Avenue du Bourget
B-1140 Brussels Belgium
Honeywell Asia Pacific Inc.
Room 3213-3225
Sun Hung Kai Centre
No. 30 Harbour Road
Wanchai
Hong Kong
Helping You Control Your World®
63-1143—1 G.R. Rev. 2-97
Printed in U.S.A. on recycled paper
containing at least 10%2post-consumer paper fibers
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