RenewAire RH Series User manual

Model RH-D Model RH-W
RH-D Series (Integral Thermostat)
RH-W Series (Wall Mount Thermostat)
RH SERIES ELECTRIC DUCT HEATERS
Installation, Operation and Maintenance Manual

1.800.627.44992
RH Series Electric Duct Heaters
ACCESSORY
WARNING AVERTISSEMENT
ARCLASH 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 elec-
tric 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 elec-
trical schematic.
Follow all local codes.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 radia-
teurs 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’in-
térieur 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, dé-
connecté 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 pro-
tection 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 autho-
rized 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 com-
ponents, assemblies or subassemblies which is caused by
improper installation practices will void the warranty.
CAUTION ATTENTION
ATTENTION
CAUTION

31.800.627.4499
RH Series Electric Duct Heaters ACCESSORY
TYPICAL UNIT LABEL (FOUND OUTSIDE OF THE
APPLIANCE)
UNIT RECORDS
Record information as shown below. In the unlikely event that factory assistance is ever
required, this information will be needed
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.
Serial Number:
Electric Duct Heater Model:
Electric Duct Heater Type: (D or W)
R H
--
-
OWNER INFORMATION
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.
OWNER INFORMATION

RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.4499
RENEWAIRE.COM 1.800.627.4499 2928 FOR THE MOST COMPLETE AND CURRENT INFORMATION VISIT RENEWAIRE.COM
OPTIONS & ACCESSORIES
Specifications may be subject to change without notice.
A single source reduces time and costs: A single
information source, a single purchase point and a single
approval package for ERVs and heaters reduces design time
and costs, and streamlines logistics for design engineers
and contractors.
More flexibility: RenewAire offers design engineers the
capacity to specify ERVs with a matching heater to boost
flexibility and provide heated air to a single space or
multiple spaces.
Easy installation: A ZERO clearance rating to combustibles
allows designers and contractors to apply RenewAire heaters
with less restrictions onsite.
Ultimate reliability: RenewAire heaters come with our two-year
warranty and unmatched reliability. Single-source responsibility
offers contractors and end users peace of mind and a single call
location for technical, start-up and commissioning questions.
Highly certified: CSA certified and evaluated to the applicable
ANSI/UL and CSA Standards, for use in the U.S. and Canada.
RenewAire offers the highest-efficiency energy recovery ventilators (ERVs) on the market. However, during winter
conditions,supply air from the ERV may be less than optimal for space conditions.By adding RENEWAIRE’S
ROUND ELECTRIC DUCT HEATER as an option to our single/multi-family and light
commercial ERVs, RenewAire can now heat supply air during cooler months to enhance indoor comfort, all via one
package for ERVs and heaters from a single source.
RH SERIES
RH-W SHOWN
KEY BENEFITS
ACCESSORIES
AVAILABLE ON SINGLE/MULTI-FAMILY AND LIGHT COMMERCIAL UNITS (SOME EXCEPTIONS APPLY)
RH Series Electric Duct Heater
OPTIONS & ACCESSORIES
Specifications may be subject to change without notice.
SPECIFICATIONS
Heater Type:
Electric Duct Heater
Typical KW Range:
1–11.5 kW (1, 2, 3, 4, 5, 6, 8, 10, 11.5 kW)
Voltages & Phase:
Single phase - 120, 208 and 240V
Control Voltage:
24 VAC
Controllable Output Temperature Range:
RH-D: 5 to 131˚ F
RH-W: -3 to 130˚ F
Standard Features:
Open-coil element
High-grade, nickel-chrome element wire
Thermostat - Integral (RH-D),
Wall mount (RH-W)
Modulating heat output (SCR control)
Vertical or horizontal operation
Automatic limit switch for primary
over-temperature protection
Manual reset limit switch for secondary
over-temperature protection
Airflow sensor
Standard control transformer - 24 VAC
Corrosion-resistant galvanized steel
Round duct collars
High-voltage terminal block connections
Grounding lug
Mounting flanges
Accessories:
Temperature sensor - Duct mount (DS-600)
Digital time clock - wall mount (TC7D-W),
in exterior enclosure (TC7D-E)
Motion occupancy sensor/control -
ceiling mount (MC-C), wall mount (MC-W)
Note: Electric duct heater designed for indoor ductwork installation only.
SERIESRH Electric Duct Heater (1-11.5 kW) Accessory
ELECTRIC DUCT HEATER
Download specification at:
renewaire.com/specifications
Minimum Airflow
(CFM)
Heater Capacity
(kW)
30 1.00
60 2.00
90 3.00
120 4.00
150 5.00
180 6.00
240 8.00
300 10.00
345 11.50
Duct
Collars kW V Size Width (X) Height (Y) Depth (Z) Max. Wt.
(lbs.)
6" 1, 2 120, 208, 240 A 11 1/2" 8" 11 1/2" 10
8" 3, 4, 5 208 B11 1/2" 10" 13 1/2" 15
8" 3, 4, 5, 6 240 B11 1/2" 10" 13 1/2" 15
10" 3, 4, 5 208 C15 1/2" 12" 15 1/2" 20
10" 3, 4, 5, 6,
8, 10, 11.5 240 C15 1/2" 12" 15 1/2" 20
12" 6, 8, 10, 11.5 240 C15 1/2" 12" 15 1/2" 20
ABC
X
Y
Z
DIMENSIONS IN INCHES
SIZE X Y Z
A 11.5 8.0 11.5
B 11.5 10.0 13.5
C 15.5 12.0 15.5
RH-W (Wall-Mount Thermostat)
RH-D (Integral Thermostat)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
30 60 90 120 150 180 210 240 270 300 330 360 500 750 1000
HEATER CAPACITY -kW
AIRFLOW - CFM
RH SERIES HEATER CAPACITY
SAFE OPERATING
RANGE
RH SERIES HEATER CAPACITY
HEATER CAPACITY - KW
AIRFLOW - CFM
Download specification at:
renewaire.com/specifications

51.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL RENEWAIRE.COM
RH Series Electric Duct Heaters ACCESSORY
1.0 OVERVIEW 8
1.1 DESCRIPTION ........................................................ 8
1.2 APPLICATIONS....................................................... 8
1.3 SAFETY FEATURES ................................................ 8
1.3.1 Low Air Flow Modulation/Shut Off ...................................... 8
1.3.2 Auto-Reset Thermal Cutout................................................ 8
1.3.3 Manual Reset Thermal Cutout ............................................ 8
1.3.4 Maintenance...................................................................... 8
1.4 AIRFLOW DIRECTION ............................................. 8
1.4.1 RH-D .................................................................................8
1.4.2 RH-W ................................................................................ 9
1.5 RH-D AND RH-W MODELS ..................................... 9
2.0 COMPONENT DESCRIPTIONS 10
2.1 RH-D................................................................... 10
2.2 RH-W .................................................................. 11
2.2.1 CTH291 Thermostat......................................................... 12
3.0 DIMENSIONED DRAWINGS 13
3.1 RH-W AND RH-D WITH 6" DUCT COLLAR.............. 13
3.2 RH-D AND RH-W WITH 8" DUCT COLLAR.............. 13
3.3 RH-D AND RH-W WITH 10" DUCT COLLAR............ 14
3.4 RH-D AND RH-W WITH 12" DUCT COLLAR............ 14
4.0 WIRING SCHEMATICS 15
4.1 RH-D 120 VAC ..................................................... 15
4.2 RH-D 208/240 VAC (1, 2, 3, 4, 5, AND 6 KW)......... 15
4.3 RH-D 240 VAC (8, 10, AND 11.5 KW) .................... 16
4.4 RH-W 120 VAC .................................................... 16
4.5 RH-W 208/240 VAC (1, 2, 3, 4, 5, AND 6 KW) ........ 17
4.6 RH-W 240 VAC (8, 10, AND 11.5 KW).................... 17
5.0 UNIT WEIGHTS 18
5.1 RH-D AND RH-W WITH 6" DUCT........................... 18
5.2 RH-D AND RH-W WITH 8" DUCT........................... 18
5.3 RH-D AND RH-W WITH 10" OR 12" DUCTS........... 18
6.0 INSTALLATION 18
6.1 MINIMUM AIRFLOW REQUIREMENTS.................... 18
6.2 INSTALLATION LOCATION......................................18
6.3 UNIT ORIENTATION ...............................................18
6.4 INSTALLATION CLEARANCES.................................18
6.5 DUCTWORK CONNECTIONS...................................19
6.6 DUCTWORK INSULATION.......................................19
6.7 VERIFY AIRFLOW DIRECTION (RH-D UNITS ONLY) ..19
6.8 CONNECT ELECTRIC SERVICE ...............................20
6.8.1 Line Voltage Wiring Entry Point..........................................20
6.9 CONNECT THERMOSTAT (RH-W ONLY)...................20
6.9.1 Low Voltage Wiring Entry Point (RH-W Only) ......................24
6.10 SET CONTROLLER POTENTIOMETER (RH-D ONLY)24
7.0 MAINTENANCE 25
7.1 RH-D ANNUAL MAINTENANCE...............................25
7.2 RH-W ANNUAL MAINTENANCE..............................25
7.3 RH-D TROUBLE SHOOTING....................................25
7.3.1 Testing AFS and DS Sensors..............................................25
7.3.2 Testing Control Modules D21-T and D22-T.........................25
7.3.3 Testing Heating Elements..................................................26
7.3.4 Testing the Transformer ....................................................26
7.4 RH-W TROUBLE SHOOTING ...................................26
7.4.1 Testing the CTH291 Thermostat ........................................26
7.4.2 Testing the S2 Airflow Sensor ...........................................27
7.4.3 Testing the PSSR Control Module ......................................27
7.4.4 Testing the SSR ................................................................27
7.4.5 Testing the Heating Elements ............................................27
7.4.6 Testing the Transformer ....................................................27
7.5 SEQUENCE OF OPERATIONS..................................28
7.5.1 RH-D Heaters....................................................................28
7.5.2 RH-W Heaters...................................................................28
8.0 FACTORY ASSISTANCE 29
9.0 SERVICE PARTS 30
9.1 RH-D 1, 2, 3, 4, 5, AND 6 KW SERVICE PARTS .......30
9.2 RH-D 8, 10, AND 11.5 KW SERVICE PARTS ............30
9.3 RH-W 1, 2, 3, 4, 5, AND 6 KW SERVICE PARTS.......31
9.4 RH-W 8, 10, AND 11.5 KW SERVICE PARTS ...........31
TABLE OF CONTENTS

1.800.627.44996
RH Series Electric Duct Heaters
ACCESSORY
TABLE OF ILLUSTRATIONS
Figure 1.5.0 RH Series Configurations................................................................................................. 9
Figure 2.1.0 RH-D Manual Reset Thermal Cutout and Output Air Temperature Sensor......................... 10
Figure 2.1.1 RH-D Airflow Sensor and Autor Reset Thermal Cutout..................................................... 10
Figure 2.1.2 RH-D Controls (typ) ........................................................................................................11
Figure 2.2.0 RH-W Controls (typ) .......................................................................................................11
Figure 2.2.1 RH-W CTH291 Wall Thermostat (typ) ..............................................................................12
Figure 3.1.0 RH-D and RH-W 6" Duct Collar Dimensioned Drawing .....................................................13
Figure 3.2.0 RH-D and RH-W 8" Duct Collar Dimensioned Drawing.....................................................13
Figure 3.3.0 RH-D and RH-W 10" Duct Collar Dimensioned Drawing ...................................................14
Figure 3.4.0 RH-D 12" Duct Collar Dimensioned Drawing ...................................................................14
Figure 4.1.0 RH-D 120 VAC Wiring Schematic.....................................................................................15
Figure 4.2.0 RH-D 208/240 VAC Wiring Schematic (1, 2, 3, 4, 5, 6 kW)...............................................15
Figure 4.3.0 RH-D 240 VAC Wiring Schematic (8, 10, 11.5 kW) .......................................................... 16
Figure 4.4.0 RH-W 120 VAC Wiring Schematic................................................................................... 16
Figure 4.5.0 RH-W 208/240 VAC Wiring Schematic (1, 2, 3, 4, 5, 6 kW)..............................................17
Figure 4.6.0 RH-W 240 VAC Wiring Schematic (8, 10, 11.5 kW)...........................................................17
Figure 6.4.0 Ventilation Clearance......................................................................................................18
Figure 6.4.1 Orientations ...................................................................................................................18
Figure 6.4.2 Installation Supports ......................................................................................................19
Figure 6.7.0 Airflow Directions...........................................................................................................19
Figure 6.9.0 RH-W Thermostat ......................................................................................................... 21
Figure 6.9.1 Thermostat Wiring Illustration........................................................................................ 22
Figure 6.9.2 DIP Switch Positions ..................................................................................................... 22
Figure 6.9.3 Comfort Mode Screen Shot............................................................................................ 23
Figure 6.9.4 Economy Mode Screen Shot .......................................................................................... 23
Figure 6.9.5 Wiring Termination Illustration ....................................................................................... 24
Figure 9.1.0 RH-D 1, 2, 3, 4, 5, and 6 kW Service Parts..................................................................... 30
Figure 9.2.0 RH-D 8, 10, and 11.5 kW Service Parts.......................................................................... 30
Figure 9.3.0 RH-W 1, 2, 3, 4, 5, and 6 kW Service Parts.................................................................... 31
Figure 9.4.0 RH-W 8, 10, and 11.5 kW Service Parts ......................................................................... 31

71.800.627.4499
RH Series Electric Duct Heaters ACCESSORY
MINIMUM AIRFLOW AND AIR VELOCITIES
Minimum Airflow (CFM) = 30 (CFM) x Heater Capacity (kW).
EXAMPLE: Heater Capacity = 4 kW 30 CFM x 4kW = 120 CFM Minimum Airflow
Minimum Velocity = Minimum Airflow (CFM) / Round Duct Area (ft2).
EXAMPLE: Heater Capacity = 4 kW Area of 8" Round Duct Size = 0.349 ft2
120 CFM Minimum Airflow / 0.349 ft2duct area = 344 FPM minimum cross sectional velocity
LINE CURRENT CALCULATION
Line Current (Amperes (A)) = Watts (W)/Line Voltage (V)
EXAMPLE: 4 kW Heater = 4000 W Line Voltage = 240 V
Line Current = 4000 W/240 V = 16.7 A
KW AND TEMPERATURE RISE
The following formula may be used to determine the approximate total kW required when the CFM (air
volume) and desired temperature rise (°F) are known:
kW = (CFM x ∆T) / 3150
DUCT HEATER TEMPERATURE RISE
The following formula may be used to determine the approximate temperature rise (°F) of a duct heater
when the kW and CFM are known:
∆T = (kW x 3150)/CFM.
CALCULATIONS

1.800.627.44998
RH Series Electric Duct Heaters
ACCESSORY
1.0 OVERVIEW
1.1 DESCRIPTION
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.
1.2 APPLICATIONS
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 (RH-W
with remote duct temperature sensor) or post-heat (RH-W or RH-D) devices in conjunction with
an Energy Recovery Ventilator (ERV) or a Dedicated Outdoor Air System (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
indoor applications.
1.3 SAFETY FEATURES
1.3.1 Low Air Flow Modulation/Shut Off
The heater has a thermistor airflow sensor that will detect any overheating condition caused
by low airflow. The sensor has a threshold of 111°F [44°C]. If a temperature higher than 111°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 111°F
and the reduction will increase proportionally up to a detected temperature of 124°F [51°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 125°F. If a temperature
higher than 125°F is detected, the auto-reset cutout will shut off power to the heater element.
Once the detected temperature drops below 125°F, the cutout will reset itself and restore power
to the heater element.
1.3.3 Manual Reset Thermal Cutout
The heater has a manual reset thermal cutout having a threshold of 200°F. If a temperature
higher than 200°F is detected, power to the heater element is shut off until the heater cools and
the cutout is manually reset.
1.3.4 Maintenance
There is no required annual maintenance for these units.
1.4 AIRFLOW DIRECTION
1.4.1 RH-D
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 figures on page 12 and 20. If airflow direction other than as shown is
desired, the sensor must be relocated to the alternate location, as shown.
Alternatively, the output Air Tmperature Sensor can be replaced with Remote Duct Sensor
NOTE: This unit
is a high-voltage
open coil electric
heater, used for
both commercial and
residential applications. It
is commonly referred to in
this manual as an “electric
heater.”

91.800.627.4499
RH Series Electric Duct Heaters ACCESSORY
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 (BMS) or by a RenewAire
Premium Programmable Controller.
The heater should be supplied by a separate cable, of appropriate gauge and with appropriate
protection. Use wire suited for 167°F. Conform to all local and national electrical codes for
wiring.
6" 8" 10" 12" 1 2 3 4 5 6 8 10 11.5 120 208 240
RHD1120-6
131320
TER-6-1120  8.33 12 15
RHD1208-6
131352
TER-6-1208  4.80 12 15
RHD1240-6
131353
TER-6-1240  4.16 12 15
RHD2120-6
131321
TER-6-2120    16.7 12 20
RHD2208-6
131354
TER-6-2208    9.61 12 15
RHD2240-6
131355
TER-6-2240    8.33 12 15
RHD3208-8
131356
TER-8-3208    14.4 12 20
RHD3240-8
131322
TER-8-3240    12.5 12 15
RHD4208-8
131357
TER-8-4208    19.2 10 30
RHD4240-8
131323
TER-8-4240    16.7 12 20
RHD5208-8
131358
TER-8-5208    24.0 10 30
RHD5240-8
131359
TER-8-5240 20.8 10 30
RHD6240-8
131360
TER-8-6240    25.0 10 40
RHD3208-10
131336
TER-10-3208  14.4 12 20
RHD3240-10
131337
TER-10-3240  12.5 12 15
RHD4208-10
131338
TER-10-4208    19.2 10 30
RHD4240-10
131339
TER-10-4240    16.7 12 20
RHD5208-10
131340
TER-10-5208 24.0 10 30
RHD5240-10
131341
TER-10-5240    20.8 10 30
RHD6240-10
131342
TER-10-6240    25.0 10 40
RHD8240-10
131343
TER-10-8240    33.3 8 50
RHD10240-10
131361
TER-10-10240 41.7 6 60
RHD11-1/2240-10
131362
TER-10-12240 47.9 6 60
RHD6240-12
131344
TER-12-6240 25.0 10 40
RHD8240-12
131345
TER-12-8240    33.3 8 50
RHD10240-12
131346
TER-12-10240 41.7 6 60
RHD11-1/2240-12
131347
TER-12-12240 47.9 6 60
RHW1120-6
131324
ZON-6-1120  8.33 12 15
RHW1208-6
131363
ZON-6-1208  4.80 12 15
RHW1240-6
131364
ZON-6-1240  4.16 12 15
RHW2120-6
131325
ZON-6-2120    16.7 12 20
RHW2208-6
131365
ZON-6-2208    9.61 12 15
RHW2240-6
131366
ZON-6-2240    8.33 12 15
RHW3208-8
131367
ZON-8-3208    14.4 12 20
RHW3240-8
131326
ZON-8-3240    12.5 12 15
RHW4208-8
131368
ZON-8-4208    19.2 10 30
RHW4240-8
131327
ZON-8-4240    16.7 12 20
RHW5208-8
131369
ZON-8-5208    24.0 10 30
RHW5240-8
131370
ZON-8-5240 20.8 10 30
RHW6240-8
131371
ZON-8-6240    25.0 10 40
RHW3208-10
131328
ZON-10-3208  14.4 12 20
RHW3240-10
131329
ZON-10-3240  12.5 12 15
RHW4208-10
131330
ZON-10-4208    19.2 10 30
RHW4240-10
131331
ZON-10-4240    16.7 12 20
RHW5208-10
131332
ZON-10-5208 24.0 10 30
RHW5240-10
131333
ZON-10-5240    20.8 10 30
RHW6240-10
131334
ZON-10-6240    25.0 10 40
RHW8240-10
131348
ZON-10-8240    33.3 8 50
RHW10240-10
131372
ZON-10-10240 41.7 6 60
RHW11-1/2240-10
131373
ZON-10-12240 47.9 6 60
RHW6240-12
131335
ZON-12-6240 25.0 10 40
RHW8240-12
131349
ZON-12-8240    33.3 8 50
RHW10240-12
131350
ZON-12-10240 41.7 6 60
RHW11-1/2240-12
131351
ZON-12-12240 47.9 6 60
Line
Amps
Wire
Gauge
Fuse
Amps
Configuration Model
Duct Collar Size
Kilowattage
Voltage (1P, 60 Hz)
Part Number
1.4.2 RH-W
Airflow direction in the RH-W can be in either direction, with no changes to the unit hardware.
FIGURE 1.5.0 RH SERIES CONGURATIONS
accessory DS-600 (PN 131319) when connected to the 'ss' terminals on RH-D controller. Using
the DS-600 Remote Duct Sensor may be deisred when the output temperature of the heater
needs to be controlled some distance from the RH-D heater.

1.800.627.449910
RH Series Electric Duct Heaters
ACCESSORY
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°F and then automatically
reset itself and there is a second cutout that will shut down the heater at 200°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
between 32°F and 108°F from the unit and heat output is modulated by the controller, which
causes the SSR to provide pulsed current to the heating coil.
The electronic controller modulates the heater's capacity according to the quantity of air flowing
through the heater by responding to the radiant heat of the elements even at very low CFMs.
With normal airflow, the controller will operateat full power. When the airflow drops below the
minimum airflow (30 CFM per kW), the controller will still operate, but at reduced power. It will
also safely shut down the heater in case of a total loss of airflow.
OUTPUT AIR TEMPERATURE SENSOR
(MUST BE INSTALLED ON THE OUTLET
SIDE)
MANUAL RESET THERMAL CUTOUT
(200°F)
AUTO RESET THERMAL CUTOUT
(125°F)
AIRFLOW SENSOR (CHECKS FOR
MINIMUM AIRFLOW)
COMPONENT DESCRIPTIONS
FIGURE 2.1.0 RH-D MANUAL RESET THERMAL CUTOUT AND OUTPUT AIR TEMPERATURE SENSOR
FIGURE 2.1.1 RH-D AIRFLOW SENSOR AND AUTO RESET THERMAL CUTOUT