RH-D AND RH-W ELECTRIC DUCT HEATERS
7
1.800.627.4499
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
RENEWAIRE.COM
COMPONENT DESCRIPTION
2.0 COMPONENT DESCRIPTIONS
2.1 RH-D
RH-D heaters use open coil, electric resistance hardware to provide an adjustable heat output. An
airflow sensor is provided, checking for minimum airflow. There are two separate thermal cutout
devices, the first of which will shut down the heater at 125
0
F and then automatically reset itself and
there is a second cutout that will shut down the heater at 200
0
F. The second cutout must be manually
reset. The controller operates on 24 VAC provided by an on-board transformer. The controller has a
potentiometer to set the desired output air temperature from the unit and heat output is modulated by
the controller, which causes the SSR to provide pulsed current to the heating coil.
Output Air Temperature Sensor
(must be installed on the outlet
side)
Alternate Air Temperature Sensor Location
(move the sensor here if airflow direction
is reversed)
Manual Reset Thermal Cutout
(200
0
F)
Manual Reset Thermal Cutout
(200
0
F)
Auto Reset Thermal Cutout
(125
0
F)
Airflow Sensor
(checks for minimum airflow)
Potentiometer for Setting
Desired Output Air
Temperature
RH-D Heater (typ)
RH-D Controls (typ)
Air Temperature Sensor as
Shipped From Factory
Airflow Direction as
Shipped From Factory
LED Indicator Light
(turns ON to show when
power is going to the
heating coils)
