RenewAire RH-D Series Instruction manual

ELECTRIC DUCT HEATER
INSTALLATION, OPERATION & MAINTENANCE MANUAL
WWW.RENEWAIRE.COM
RH-D Series
RH-W Series
Model RH-D Shown
LR 30551

RH-D AND RH-W ELECTRIC DUCT HEATERS
RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.44992
IMPORTANT SAFETY INFORMATION
WARNING AVERTISSEMENT
ARC FLASH AND ELECTRIC SHOCK HAZARD
All models of Electric Heaters as discussed in this manual operate
on high voltages that can cause severe electric shock. Some
models of Electric Heaters use high voltages that are capable
of causing dangerous arc flash. Whenever accessing any part or
component of the heater, disconnect all electric power supplies,
verify with a voltmeter that electric power is OFF and wear
protective equipment per NFPA 70E when working within the
electric enclosure. Failure to comply can cause serious injury
or death.
The terminal blocks contain live high-voltage.
The only way to ensure that there is NO voltage inside the unit
is to install and open a remote disconnect switch and verify that
power is off with a voltmeter. Refer to unit electrical schematic.
Follow all local codes.
RISQUE FLASH D’ARC OU DE CHOC ÉLECTRIQUE GRAVE
Tous les modèles de radiateurs électriques décrits dans ce manuel
fonctionnent avec des tensions élevées pouvant causer un choc
électrique grave. Certains modèles de radiateurs électriques
utilisent des tensions élevées susceptibles de provoquer des arcs
électriques dangereux. Lorsque vous accédez à une pièce ou à un
composant du chauffe-eau, débranchez toutes les alimentations
électriques, vérifiez avec un voltmètre que le courant est coupé
et portez un équipement de protection conformément à NFPA
70E lorsque vous travaillez dans le boîtier électrique. Ne pas se
conformer peut entraîner des blessures graves ou la mort.
Les borniers contiennent une haute tension sous tension.
Le seul moyen de s’assurer qu’il n’ya PAS de tension à l’intérieur
de l’unité est d’installer et d’ouvrir un sectionneur à distance et de
vérifier que l’alimentation est coupée avec un voltmètre. Reportez-
vous au schéma électrique de l’unité.
Suivez tous les codes locaux.
RISK OF ELECTRIC SHOCK OR EQUIPMENT DAMAGE
Whenever electrical wiring is connected, disconnected or
changed, the power supply to the electric heater and its controls
must be disconnected. Lock and tag the disconnect switch or
circuit breaker to prevent accidental reconnection of electric
power. RISQUE DE CHOC ÉLECTRIQUE OU DE DOMMAGES MATERIELS
Chaque fois que le câblage électrique est connecté, déconnecté
ou modifié, l’alimentation électrique du radiateur électrique
et de ses commandes doit être déconnectée. Verrouillez et
étiquetez le sectionneur ou le disjoncteur pour empêcher toute
reconnexion accidentelle de l’alimentation électrique.
RISQUE DE BRÛLURES
Cet appareil est un radiateur électrique et est capable de produire
des températures très élevées, susceptibles de provoquer de
graves brûlures. Soyez prudent lorsque vous travaillez sur le
radiateur et portez un équipement de protection individuelle
(EPI) approprié lorsque vous travaillez sur l’appareil.
RISK OF BURNS
This device is an electric heater and produces very high
temperatures, capable of causing severe burns. Use caution
when working on the heater and wear appropriate Personal
Protective Equipment (PPE) whenever working on the unit.
IMPORTANT
IMPORTANT
Only persons who have been properly trained and authorized
are to access the electric heater and its controls. Changes to
the electric heater wiring and controls are to be made only by
trained and authorized personnel.
This equipment is to be installed by following Industry Best
Practices and all applicable codes. Any damage to components,
assemblies or subassemblies which is caused by improper
installation practices will void the warranty.
CAUTION
CAUTION
CAUTION
CAUTION
ATTENTION
ATTENTION
CAUTION

RH-D AND RH-W ELECTRIC DUCT HEATERS
31.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL RENEWAIRE.COM
OWNER INFORMATION
Record information as shown below. In the unlikely event that factory assistance is ever required, this
information will be needed.
Serial Number:
Electric Duct Heater Model:
Electric Duct Heater Type: (D or W)
R H
--
-
Locate the RenewAire unit label, to be found on the outside of the appliance.
NOTE: This information is for purposes of identifying the specific appliance. Unit-specific option data can
then be obtained, as needed, from the Model Number.
NOTE: This page is to
be completed by the
installing contractor.
The completed
document is to be turned over
to the owner after start-up.
UNIT RECORDS

RH-D AND RH-W ELECTRIC DUCT HEATERS
RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.44994
OWNER INFORMATION
TABLE OF CONTENTS
TABLE OF ILLUSTRATIONS
IMPORTANT SAFETY INFORMATION 2
UNIT RECORDS 3
1.0 OVERVIEW 5
1.1 DESCRIPTION 5
1.2 APPLICATIONS 5
1.3 SAFETY FEATURES 5
1.3.1 Low Air Flow Modulation / Shut Off 5
1.3.2 Auto-Reset Thermal Cutout 5
1.3.3 Manual Reset Thermal Cutout 5
1.3.4 Maintenance 5
1.4 AIRFLOW DIRECTION 5
1.4.1 RH-D 5
1.4.2 RH-W 5
1.5 RH-D AND RH-W MODELS 6
2.0 COMPONENT DESCRIPTION 7
2.1 RH-D 7
2.2 RH-W 8
2.2.1 CTH291 Thermostat 8
2.3 COMPANION ACCESSORIES 9
2.3.1 Occupancy Sensor 9
2.3.2 Timer 9
3.0 DIMENSIONED DRAWINGS 10
3.1 RH-D AND RH-W WITH 6” DUCT COLLAR 10
3.2 RH-D AND RH-W WITH 8” DUCT COLLAR 10
3.3 RH-D AND RH-W WITH 10” DUCT COLLAR 11
3.4 RH-D AND RH-W WITH 12” DUCT COLLAR 11
4.0 UNIT WEIGHTS 12
4.1 RH-D AND RH-W WITH 6” DUCT 12
4.2 RH-D AND RH-W WITH 8” DUCT 12
4.3 RH-D AND RH-W WITH 10” OR 12” DUCTS 12
5.0 INSTALLATION 12
5.1 MINIMUM AIRFLOW REQUIREMENTS 12
5.2 INSTALLATION LOCATION 12
5.3 UNIT ORIENTATION 12
5.4 INSTALLATION CLEARANCES 12
5.5 DUCTWORK CONNECTIONS 12
5.6 DUCTWORK INSULATION 13
5.7 VERIFY AIRFLOW DIRECTION (RH-D UNITS ONLY) 13
5.8 CONNECT ELECTRIC SERVICE 13
5.8.1 Line Voltage Wiring Entry Point 13
5.9 CONNECT THERMOSTAT (RH-W ONLY) 13
5.9.1 Low Voltage Wiring Entry Point (RH-W Only) 17
5.10 SET CONTROLLER POTENTIOMETER (RH-D ONLY) 17
6.0 WIRING SCHEMATICS 18
6.1 RH-D 120 VAC 18
6.2 RH-D 208/240 VAC (1,2,3,4,5 AND 6 KW) 18
6.3 RH-D 208/240 VAC (8,10 AND 11.5 KW) 19
6.4 RH-W 120 VAC 19
6.5 RH-W 208/240 VAC (3,4,5,6 KW) 20
6.6 RH-W 208/240 VAC (8,10,11.5 KW) 20
7.0 MAINTENANCE 21
7.1 RH-D ANNUAL MAINTENANCE 21
7.2 RH-W ANNUAL MAINTENANCE 21
7.3 RH-D TROUBLE SHOOTING 21
7.3.1 Testing AFS and S1 Sensors 21
7.3.2 Testing Control Modules D21-T and D22-T 21
7.3.3 Testing Heating Elements 22
7.3.4 Testing the Transformer 22
7.4 RH-W TROUBLE SHOOTING 22
7.4.1 Testing the CTH291 Thermostat 22
7.4.2 Testing the S2 Airflow Sensor 22
7.4.3 Testing the PSSR Control Module 22
7.4.4 Testing the SSR 23
7.4.5 Testing the Heating Elements 23
7.4.6 Testing the Transformer 23
7.5 SEQUENCE OF OPERATION 23
7.5.1 RH-D Heaters 23
7.5.2 RH-W Heaters 24
8.0 FACTORY ASSISTANCE 24
9.0 WARRANTY 24
10.0 REPAIR PARTS 25
10.1 RH-D 1,2,3,4,5,6 KW REPAIR PARTS 25
10.2 RH-D 8,10,11.5 KW REPAIR PARTS 25
10.4 RH-W 8,10,11.5 KW REPAIR PARTS 26
10.3 RH-W 1,2,3,4,5,6 KW REPAIR PARTS 26
11.0 ENGINEERING AND PERFORMANCE DATA 27
RH-D Heater (typ) 7
RH-D Controls (typ) 7
RH-W Heater (typ) 8
RH-W Controls (typ) 8
Wall Thermostat (typ) 8
MC-C Occupancy Sensor, Ceiling Mount 9
TC7D-W Wall Mount Time Clock 9
MC-W Occupancy Sensor, Wall Mount 9
TC7D-E Time Clock 9
RH-D and RH-W 6” Duct Collar Dimensioned Dwg 10
RH-D and RH-W 8” Duct Collar Dimensioned Dwg 10
RH-D and RH-W 10” Duct Collar Dimensioned Dwg 11
RH-D 12” Duct Collar Dimensioned Dwg 11
Ventilation Clearance 12
Thermostat Wiring Illustration 15
DIP Switch Positions 15
Comfort Mode Screen Shot 16
Economy Mode Screen Shot 16
Wiring Termination Illustration 17
RH-D 1,2,3,4,5,6 KW Repair Parts 25
RH-D 8,10,11,5 KW Repair Parts 25
RH-W 1,2,3,4,5,6 KW Repair Parts 26
RH-W 8,10,11.5 KW Repair Parts 26

RH-D AND RH-W ELECTRIC DUCT HEATERS
51.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL RENEWAIRE.COM
OVERVIEW
NOTE: This unit is a
high-voltage open coil
electric heater, used for
both commercial and res-
idential applications. It is com-
monly referred to in this manual
as an “electric heater”.
1.0 OVERVIEW
1.1 DESCRIPTION
1.2 APPLICATIONS
1.4 AIRFLOW DIRECTION
The RH-D and RH-W heaters are open-coil, electric resistance duct heaters that come in several
different models with different wattages and duct sizes. The RH-D heater has an internal temperature
sensor mounted in the outlet side of the unit and has an adjustable thermostat that determines what
the outlet air temperature is to be. The controller then modulates current to the heating coil to maintain
that temperature setting. The RH-W heater requires an external analog 0 - 10 VDC control signal,
supplied by wall-mount thermostat, a RenewAire Premium Commercial Controller or a BMS. A wall-
mount thermostat is provided with each RH-W unit. Every heater is equipped with an airflow sensor to
detect minimum allowable airflow. If there is inadequate airflow, current to the heating coils is reduced
to a level that corresponds to the detected airflow volume. All heaters use a Solid State Relay (SSR) to
modulate the heat output.
1.4.1 RH-D
1.4.2 RH-W
Airflow direction in the RH-D must be coordinated with the Output Air Temperature Sensor. The sensor
must be located on the outlet side of the unit in order to properly monitor the output temperature.
See the illustrations on page 7. If airflow direction other than as shown is desired, the sensor must be
relocated to the alternate location, as shown.
Airflow direction in the RH-W can be in either direction, with no changes to the unit hardware.
1.3 SAFETY FEATURES
1.3.1 Low Air Flow Modulation / Shut Off
The heater has a thermistor air flow sensor that will detect any overheating condition caused by low
air flow. The sensor has a threshold of 111º F [44º C]. If a temperature higher than 111º F is detected,
it will cause the controller to begin reducing the pulse width of the control signal being sent to the SSR.
The reduction in pulse width begins at a detected temperature of 111º F and the reduction will increase
proportionally up to a detected temperature of 124º F [51º C], at which point the sensor will shut off the
control signal to the SSR. In this mode, the unit’s Red (or Yellow) warning light is ON steady.
1.3.2 Auto-Reset Thermal Cutout
The heater has an auto-reset thermal cutout having a threshold of 125º F. If a temperature higher than
125º F is detected, the auto-reset cutout will shut off power to the heater element. Once the detected
temperature drops below 125º F, the cutout will reset itself and restore power to the heater element.
1.3.3 Manual Reset Thermal Cutout
1.3.4 Maintenance
The heater has a manual reset thermal cutout having a threshold of 200º F. If a temperature higher
than 200º F is detected, power to the heater element is shut off until the heater cools and the cutout
is manually reset.
There is no required annual maintenance for these units.
These heaters are ideally suited for use in tempering air that is delivered directly to an Occupied Space
or they can also be used as a primary heat source. They can be used as pre-heat or post-heat devices
in conjunction with an ERV or a DOAS. The RH-D can operate independantly by setting an on-board
potentiometer to maintain a constant output temperature while the RH-W uses an external temperature
control signal (wall thermostat) to modulate the heat output. These heaters are suitable for use in both
residential and commercial applications.

RH-D AND RH-W ELECTRIC DUCT HEATERS
RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.44996
OVERVIEW
1.5 RH-D AND RH-W MODELS
Both the RH-D and RH-W heaters are available in several different duct sizes and wattages. Note that
type RH-D uses an internal temperature sensor to regulate the heat output while type RH-W uses a
wall-mount thermostat that operates on 24 VAC, which is provided with the heater. The RH-W can also
be controlled by a Building Management System, or BMS.
6" 8" 10" 12"
123456810 11.5 120 208 240
RH-D TER-6-1120 l l l
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RH-D TER-6-1208 l l l
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RH-W ZON-6-1120 l l l
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RH-W ZON-6-2120 l l l
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RH-W ZON-12-10240 l l l
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RH-W
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131351
RenewAire
Part
Number
Heater
Type Model
Duct Collar Size Kilowattage Voltage (1 Phase Only)

RH-D AND RH-W ELECTRIC DUCT HEATERS
71.800.627.4499 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 1250 F and then automatically reset itself and
there is a second cutout that will shut down the heater at 2000F. 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
(2000F)
Manual Reset Thermal Cutout
(2000F)
Auto Reset Thermal Cutout
(1250F)
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)

RH-D AND RH-W ELECTRIC DUCT HEATERS
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COMPONENT DESCRIPTION
2.2 RH-W
RH-W 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 1250 F and then automatically reset itself and
there is a second cutout that will shut down the heater at 2000F. The second cutout must be manually
reset. The controller operates on 24 VAC provided by an on-board transformer. Output temperature is
controlled by an analog 0-10 VAC signal provided by either an optional wall thermostat, a BMS or by a
RenewAire Premium Programmable Controller. The heat output of the unit is modulated by means of
pulsed current supplied to the heating coils by the SSR, which is controlled by the on-board controller.
Wall Thermostat (typ)
RH-W Heater (typ)
RH-W Controls (typ)
2.2.1 CTH291 Thermostat
The CTH291 Thermostat is an 0 - 10 VDC output, dual mode device. It provides an analog 0 - 10 VDC
output signal to the RH-W controller, enabling the controller to modulate the heat output, as needed. It
has a Comfort mode and an Economy mode, which is a temperature setback of 80F. Comfort Mode is
the standard mode of operation and Economy mode can only be enabled if there is either an occupancy
sensor or a timer wired to the thermostat. Economy mode will remain active until the Normally Closed
(NC) contacts on either the timer or the occupancy sensor open, indicating an occupied condition
for the Occupied Space. When the NC contacts open, the device will switch back to Comfort mode
automatically. While the thermostat is in Economy mode, the mode can be overridden by pressing the
UP or DOWN arrow buttons to change the setpoint and then pressing the hand button to enter the new
setpoint. This override condition remains in effect for two hours.

RH-D AND RH-W ELECTRIC DUCT HEATERS
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COMPONENT DESCRIPTION
2.3 COMPANION ACCESSORIES
2.3.1 Occupancy Sensor
2.3.2 Timer
RenewAire offers both ceiling mount and wall mount occupancy sensors as options for the Electric
Duct Heater. Either device must be hard-wired to the CTH291 thermostat and powered by an external
24 VAC source.
RenewAire offers a commercial-grade timer as an option for the CTH291 Thermostat. The timer may
be pre-set to switch the thermostat from Economy mode to Comfort mode.
MC-C Occupancy Sensor, Ceiling Mount MC-W Occupancy Sensor, Wall Mount
TC7D-E Time Clock
TC7D-W Wall Mount Time Clock

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DIMENSIONED DRAWINGS
3.0 DIMENSIONED DRAWINGS
3.1 RH-D AND RH-W WITH 6” DUCT COLLAR
3.2 RH-D AND RH-W WITH 8” DUCT COLLAR
RH-D and RH-W 6” Duct Collar Dimensioned Dwg
RH-D and RH-W 8” Duct Collar Dimensioned Dwg

RH-D AND RH-W ELECTRIC DUCT HEATERS
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DIMENSIONED DRAWINGS
3.3 RH-D AND RH-W WITH 10” DUCT COLLAR
3.4 RH-D AND RH-W WITH 12” DUCT COLLAR
RH-D 12” Duct Collar Dimensioned Dwg
RH-D and RH-W 10” Duct Collar Dimensioned Dwg

RH-D AND RH-W ELECTRIC DUCT HEATERS
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INSTALLATION
4.0 UNIT WEIGHTS
5.0 INSTALLATION
4.1 RH-D AND RH-W WITH 6” DUCT
4.2 RH-D AND RH-W WITH 8” DUCT
4.3 RH-D AND RH-W WITH 10” OR 12” DUCTS
5.1 MINIMUM AIRFLOW REQUIREMENTS
5.4 INSTALLATION CLEARANCES
5.2 INSTALLATION LOCATION
5.3 UNIT ORIENTATION
All heaters require a minimum airflow in order to operate properly. The rule of thumb is that 30 CFM is
required for each kilowatt of electric heat. See the chart in Section 1.2 of this manual. If airflow through
the heater is less than 30 CFM per kilowatt, the airflow sensor will detect the reduced airflow and will
cause the controller to modulate the heat output to a level that is consistent with the airflow volume
sensed in the heater. See the illustration on Page 7 of this manual.
All Electric Duct Heaters with 6” diameter duct collars weigh 9 pounds.
All Electric Duct Heaters with 8” diameter duct collars weigh 12 pounds.
All RH-D and RH-W Electric Heaters are rated for 0 clearance to combustible surfaces. There are
ventilation openings in the top and bottom of the unit control box that require a minimum of 1/2 inch
clearance for cooling of the control box. If any heater is installed horizontally, maintain a minimum
of 1/2 inch clearance above and beneath the unit. In addition, any heater that is installed vertically
must maintain a clearance of 1 inch for a distance of 6 feet downstream from the heater.
The Electric Duct Heater should be installed as near as possible to the Occupied Space in order to
reduce heat loss from duct runs.
Ventilation Openings on Both Top and Bottom
(leave a minimum of 1/2 inch clearance
above and beneath the unit)
All RH-D and RH-W heaters may be installed either horizontally or vertically.When installed horizontally,
the unit top must be installed UP. See image below. There is a removable sheet metal cover installed on
the top that covers the auto reset temperature cutout and the airflow sensor.
5.5 DUCTWORK CONNECTIONS
Ductwork connections are to be made in accordance with SMACNA guidelines. All ductwork and its
insulation must be rated for a minimum of 200 degrees F. Ductwork should be attached with both
mechanical fasteners and UL 181 - rated duct mastic. DO NOT INSTALL ANY DUCTWORK ELBOWS
CLOSER THAN 2.5 TIMES THE DUCT DIAMETER TO THE HEATER.
Ventilation Clearance
All units having duct collars of either 10” or 12” and a capacity of up to 6 KW weigh 16 pounds. Units
having a capacity greater than 6 KW weigh 21 pounds.

RH-D AND RH-W ELECTRIC DUCT HEATERS
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INSTALLATION
WARNING
ARC FLASH AND ELECTRIC SHOCK HAZARD
All models of Electric Heaters as discussed in this manual operate on high voltages that can cause
severe electric shock. Some models of Electric Heaters use high voltages that are capable of
causing dangerous arc flash. Whenever accessing any part or component of the heater, disconnect
all electric power supplies, verify with a voltmeter that electric power is OFF and wear protective
equipment per NFPA 70E when working within the electric enclosure. Failure to comply can cause
serious injury or death.
The terminal blocks contain live high-voltage.
The only way to ensure that there is NO voltage inside the unit is to install and open a remote
disconnect switch and verify that power is off with a voltmeter. Refer to unit electrical schematic.
Follow all local codes.
RISK OF ELECTRIC SHOCK OR EQUIPMENT DAMAGE
Whenever electrical wiring is connected, disconnected or changed, the power supply to the electric
heater and its controls must be disconnected. Lock and tag the disconnect switch or circuit breaker
to prevent accidental reconnection of electric power.
CAUTION CAUTION
5.8 CONNECT ELECTRIC SERVICE
5.7 VERIFY AIRFLOW DIRECTION (RH-D UNITS ONLY)
5.9 CONNECT THERMOSTAT (RH-W ONLY)
High voltage electric service is to be brought into the unit through one of the factory-provided knockouts
located on the side of the control box. Wiring is to be terminated on the terminal block and grounding
lug as shown in the photo in Section 5.9.1 of this manual. Also see the wiring schematics in Section
8.0 of this manual. Observe all local codes.
RH-W heaters require an external 0 - 10 VDC signal to control the heater output. This is normally
accomplished by using a CTH291 wall thermostat, which also requires 24 VAC to operate. The low
voltage thermostat wiring should enter the heater through the second knockout located on the side
of the control box. Wiring is to be terminated as shown in the wiring schematics in Section 6.0 of this
manual.
5.6 DUCTWORK INSULATION
The Supply Air ductwork leading from the output side of the heater to the Occupied Space should be
insulated to prevent heat loss. Individual jobsite conditions will dictate whether the duct leading to the
inlet side of the heater should also be insulated. In some cases, the air being supplied to the heater
is coming from an Energy Recovery Ventilator (ERV) and the connecting duct passes through a space
that is not conditioned. In this case, the ductwork from the ERV to the heater should also be insulated.
5.8.1 Line Voltage Wiring Entry Point
The Outlet Air Temperature Sensor must be positioned on the outlet side of the heater. Check the airflow
direction through the heater. If necessary, move the sensor to the outlet side, as shown in Section 2.1
of this manual.

RH-D AND RH-W ELECTRIC DUCT HEATERS
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INSTALLATION
Remove two screws from bottom
of thermostat and lift cover off.
Install base plate on wall using provided
hardware or mount directly on standard 2 X 4
electrical junction box.
Pull low-voltage wiring through
opening in the back of the
thermostat and then attach
thermostat to base plate using
the provided two short screws.
Each thermostat is provided with a mounting base plate and all necessary mounting hardware.
• Mount the base plate on the wall using provided anchors and screws or mount it directly on a
standard 2 X 4 electrical junction box..
• Open the thermostat housing by removing two screws on the bottom of the thermostat and lift
the cover off.
• Pull low voltage wiring through the opening in the back of the thermostat and then mount the
thermostat on the base plate using the provided two short screws.
• Connect low voltage wiring as shown in illustration at right.
• Set the DIP switches to desired settings. See chart and illustration at right.
• Reinstall the front cover.
• Reconnect power to the heater, which will provide 24 VAC to the thermostat.
RISK OF ELECTRIC SHOCK OR EQUIPMENT DAMAGE
Whenever electrical wiring is connected, disconnected or changed, the power supply to the electric
heater and its controls must be disconnected. Lock and tag the disconnect switch or circuit breaker
to prevent accidental reconnection of electric power.
CAUTION CAUTION

RH-D AND RH-W ELECTRIC DUCT HEATERS
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INSTALLATION
24 VAC
24 VAC Common
0 - 10 VDC
Provide field wiring from these
three terminals to terminal lugs
on RH-W controller. See wiring
schematics 6.4, 6.5 and 6.6 in
this manual.
DIP SWITCH POSITIONS
SWITCH
1
3
6
2
5
4
7
OFF
OC
INTERNAL SENSOR
RH-W ROOM APPLICATION
REVERSE ACTING OUTPUT
NOT USED
0 - 10 VDC
NOT USED
ON
0F
NOT USED
NOT USED
NOT USED
FULL SET POINT RANGE
NOT USED
NOT USED
Connect optional Occupancy
Sensor or Timer to terminals
4 and 5. Use Normally
Closed (NC) contacts. When
contacts open (or if no
sensor or timer is present),
thermostat will operate only
in Comfort Mode.
Thermostat Wiring Illustration
DIP Switch Positions

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INSTALLATION
FOR THERMOSTATS THAT DO NOT HAVE EITHER AN OCCUPANCY SENSOR OR A TIMER:
When line voltage is applied to the heater, it automatically provides power to the CTH291 thermostat.
The LCD screen on the thermostat will show the current (ambient) temperature and a small indicator
symbol at the bottom shows whether or not there is a call for heat. If the current setpoint is less
than the ambient temperature, there will be no call for heat and the indicator symbol will remain on
constantly. When the setpoint temperature is greater than the ambient temperature, a call for heat will
be provided by the thermostat to the heater controller and the indicator symbol will blink as long as
there is a call for heat. The thermostat will put out an analog 0 - 10 VDC control signal to the heater
controller, which ramps UP and DOWN slowly.
To change the desired temperature setpoint, press either the UP or DOWN arrow button. The view on
the screen will change from the current ambient temperature to show the active setpoint. To change
the setpoint, continue to press either the UP or DOWN arrow.
Blinks whenever a call for heat is
being sent to the heater controller
• Ambient temperature if not blinking.
• When either UP or DOWN arrow is
pressed briefly, the current setpoint
will show.
• Continue pressing either UP or
DOWN arrows to change the
setpoint.
FOR THERMOSTATS THAT HAVE EITHER AN OCCUPANCY SENSOR OR A TIMER CONNECTED:
When an occupancy sensor or a timer is connected to terminals 4 and 5 on the terminal strip (see
illustration on page 15) in the thermostat, the thermostat will go into Economy mode as long as the
NC contacts are closed. When the contacts open, this represents an occupied mode for the Occupied
Space and the thermostat will switch from Economy mode to Comfort mode.
Economy mode can be overridden for up to two hours without the NC contacts opening, and a temporary
setpoint can be installed. Press either the UP or the DOWN arrow button and both the temperature
reading and the indicator dot will blink. Continue pressing the UP and DOWN arrow buttons as needed
to establish the new setpoint and then press the Hand button to enter the new reading.
The Economy mode setpoint is always 80F less than the Comfort mode setpoint unless it is being
temporarily overridden.
• Indicates thermostat is in Economy
mode.
• Blinks while changing Economy
mode setpoint
Comfort Mode Screen Shot
Economy Mode Screen Shot

RH-D AND RH-W ELECTRIC DUCT HEATERS
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INSTALLATION
5.9.1 Low Voltage Wiring Entry Point (RH-W Only)
Low voltage wiring is to be brought into the unit through one of the factory-provided knockouts located
on the side of the control box. See the dimensioned drawings in Section 3.0 of this manual.
Terminate Thermostat
Wiring on Terminal
Block
Grounding Lug
Terminate line voltage
wiring here
Wiring Termination Illustration
5.10 SET CONTROLLER POTENTIOMETER (RH-D ONLY)
Set the potentiometer to the desired output temperature from the heater. See the illustration on page
7 of this manual.

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WIRING SCHEMATICS
6.1 RH-D 120 VAC
6.2 RH-D 208/240 VAC (1,2,3,4,5 AND 6 KW)
6.0 WIRING SCHEMATICS
RH-D 120 VAC Wiring Schematic
RH-D 208/240 VAC Wiring Schematic (1,2,3,4,5,6 KW)

RH-D AND RH-W ELECTRIC DUCT HEATERS
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WIRING SCHEMATICS
6.3 RH-D 208/240 VAC (8,10 AND 11.5 KW)
RH-D 208/240 VAC Wiring Schematic (8,10,11.5 KW)
6.4 RH-W 120 VAC
RH-W 120 VAC Wiring Schematic

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WIRING SCHEMATICS
6.6 RH-W 208/240 VAC (8,10,11.5 KW)
RH-W 208/240 VAC Wiring Schematic (8,10,11.5 KW)
6.5 RH-W 208/240 VAC (3,4,5,6 KW)
RH-W 208/240 VAC Wiring Schematic (3,4,5,6 KW)