RT-SVD03L-EN
137
ReliaTel
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- Humidity Sensors
Outdoor Humidity Sensor
Field installed accessory, located below and to the left
of economizer actuator motor. Used in reference
(BAYENTH005*) and comparative (BAYENTH006*)
enthalpy control. Operates from 10-90% RH, 32°F – 90°
F.
Figure 89.
Humidity sensor
C7600C 1016
X13790376-01
Component Description
Humidity Sensor (OHS, RHS)
Part Number
SEN-01036
Return Humidity Sensor
Field installed accessory, located inside economizer
barometric relief hood. Used in comparative
(BAYENTH006*) enthalpy control only. (Honeywell
#C7600C).
To Test Humidity Sensors
Return Air Humidity Sensor
ECA
RAH/RAE
Outdoor Humidity Sensor
ECA
OAH/OAE
To test this circuit, place a DC milliamp meter in series
with either of the leads to the humidity sensor. If the
reading is 0ma, polarity may be reversed. R & -
and retest. If the reading does not correspond to the
table below, check the output voltage from the ECA
with the sensor disconnected.
The DC voltage at the OAH and RAH pins on the
Honeywell ECA module should be approximately 15 or
20VDC (depending on the ECA version) or 23Vdc if the
module is a RTEM. If so, and all connections are intact,
replace the sensor. If the appropriate Vdc signal is not
present, yet the economizer module's green LED is on,
the economizer module has failed.
Table 97.
Module voltage compared to return
humidity
RH%
DCma
100%
20
97.7
19.636
95.5
19.286
93.4
18.947
91.4
18.621
89.4
18.305
87.5
18
85.7
17.705
83.9
17.419
82.1
17.143
80.5
16.875
78.8
16.615
77.3
16.364
75.7
16.119
74.3
15.882
72.8
15.652
71.4
15.429
70.1
15.211
68.8
15
67.5
14.795
66.2
14.595
65
14.4
63.8
14.211
62.7
14.026
61.5
13.846
60.4
13.671
59.4
13.5
58.3
13.333
57.3
13.171
56.3
13.012
55.4
12.857
54.4
12.706
53.5
12.558
52.6
12.414
51.7
12.273
50.8
12.135
50
12
49.2
11.868
48.4
11.739
47.6
11.613
46.8
11.489
46.1
11.368
45.3
11.25
44.6
11.134
43.9
11.02
43.2
10.909
42.5
10.8
41.8
10.693
41.2
10.588
40.5
10.485
39.9
10.385
39.3
10.286
38.7
10.189
38.1
10.093
37.5
10
36.9
9.908
36.4
9.818
35.8
9.73
35.3
9.463
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