RT-SVD03G-EN 109
ReliaTel Humidity Sensors
Outdoor Humidity Sensor
Field installed accessory, located below and to the left of economizer actuator motor. Used in
reference (BAYENTH005A) and comparative (BAYENTH006A) enthalpy control. Operates from 10-
90% RH, 32°F – 90°F.
Return Humidity Sensor
Field installed accessory, located inside economizer barometric relief hood. Used in comparative
(BAYENTH006A) enthalpy control only. (Honeywell #C7600C).
To Test Humidity Sensors
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. Reverse + & - 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.
Figure 64. Humidity Sensor
C7600C 1016
X13790376-01
Component Description
Humidity Sensor (OHS, RHS)
Part Number
SEN-01036
Return Air Humidity
Sensor
ECA RAH/RAE
Outdoor Humidity
Sensor
ECA OAH/OAE
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