Detroit Radiant Products DSC series Owner's manual

DANGER
WARNING
!
!
Improper installation, adjustment, alteration, service or maintenance can cause
property damage, injury or death. Read and understand the installation, operating
and maintenance instructions thoroughly before installing or servicing this equipment.
This heater must be installed and serviced by trained gas installation and service
personnel only. Inspect the heater annually. Failure to comply could result in personal
injury, asphyxiation, death fire and/or property damage.
Storage of gasoline and other flammable vapors and liquids in the vicinity of this or
any other appliance may result in fire or explosion. Do not store or use gasoline or
other flammable vapors and liquids in the vicinity of this or any other appliance. An
LP cylinder not connected for use shall not be stored in the vicinity of this or any other
appliance. Maintain clearance to combustibles at all times.
For outdoor use only. This heater is not approved for use in any indoor residential
application. This includes, but is not limited to, attached garages, solarium, living
quarters, etc. Installation in residential indoor spaces may result in property damage,
asphyxiation, serious injury or death
LIODSCS-Rev. 32513
Print: LIODSCS-1M-11/14(CDS)
Replaces: LIODSCS-1M-2/14(CDS)
DSC Series Manual
Detroit Radiant Products Company
Installation, Operation,
Maintenance and Parts
INSTALLER: Present this manual to the end user.
Keep these instructions in a clean and dry place for future reference.
Model#: ___________________ Serial #: _________________________
(located on rating label)
If you smell gas:
1. Shut off gas to the appliance.
2. Extinguish any flame.
3. If odor continues, keep away from the appliance and immediately call your gas supplier or fire
department.
!

2
DSC Series
Contents
1.0 Safety....................................................................3
Safety Symbols .......................................................3
Applications ..........................................................3
Clearance to Combustibles ..............................................4
Standards, Certifications and Government Regulations ........................6
Safety Signs and Labels ................................................8
2.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Heater Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Recommended Mounting Heights.........................................11
Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Gas Connection.......................................................14
Leak Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electrical Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.0 Operation ................................................................20
Sequence of Operation .................................................20
4.0 Maintenance ..............................................................21
Periodic Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Service Access Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Maintenance Log ......................................................24
5.0 Parts ....................................................................26
6.0 Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

32
NOTICE
CAUTION
!
WARNING
!
!
DANGER
!
!
DSC Series
Safety Symbols
Safety is the most important consideration during installation, operation and maintenance of the infrared
heater. You will see the following symbols and signal words when there is a hazard related to safety or
property damage.
WARNING
!
Improper installation, adjustment, alteration, service or maintenance can cause
property damage, serious injury or death. Read and understand the installation,
operating and maintenance instructions thoroughly before installing or servicing this
equipment. Only trained, qualified gas installation and service personnel may install or
service this equipment.
1.0 Safety •Safety Symbols •Applications
Applications
This is not an explosion proof heater. Consult your local fire marshal, insurance carrier and other
authorities for approval of the proposed installation.
Commercial / Industrial
This patio heater is specifically designed to provide heated comfort in an outdoor environment. When
properly integrated into a patio design, the heaters generally increase the comfort levels.
Outdoor Residential
This heater may only be used in outdoor residential applications and is NOT approved for use in any
indoor residential application. This includes, but not limited to, attached garages, living quarters, solarium,
etc. Consult the local fire marshal and/or insurance provider if unsure of your application.
WARNING
!
!
Not For Indoor Residential Use. Installation of an infrared heater system in
residential indoor spaces may result in property damage, serious injury or
death. In residential applications this heater may only be used outdoors.
1.0 Safety
Danger indicates a hazardous situation which, if
not avoided, will result in death or serious injury.
Warning indicates a potentially hazardous situation
which, if not avoided, could result in death or injury.
Caution indicates a potentially hazardous situation
which, if not avoided, could result in minor or
moderate injury.
Notice indicates a potentially hazardous situation
which, if not avoided, could result in property
damage.

4
DSC Series
A critical safety factor to consider before installation is the clearances to combustibles. Clearance to
combustibles is defined as the minimum distance you must have between the infrared surface, or
reflector, and the combustible item. Considerations must also be made for moving objects around the
infrared heater. The following is a partial list of items to maintain clearances from:
Combustible items: Moving Objects:
• Wood • Chemicals • Overhead doors • Hoists
• Paper • Wall or roof insulation • Vehicle lifts • Car wash equipment
• Fabric • Cranes
Hazards:
For maximum safety the building must be evaluated for hazards before installing the heater system.
Examples include, but are not limited to:
Children and adults should be alerted to the hazards for high surface temperatures and should stay away
to avoid burns or clothing ignition.
Young children should be carefully supervised when they are in the same space as the heater.
Clothing or other flammable materials should not be hung from the heater, or placed on or near the heater.
Any guard or other protective device removed for servicing the heater must be replaced prior to operating
the heater.
Installation and repair should be done by a qualified service person. The heater should be inspected
before use and at least annually by a qualified service person. More frequent cleaning may be required as
necessary. It is imperative that the control compartment, air passage ways and burner of the heater are
kept clean.
1.0 Safety •Clearance to Combustibles
Clearance to Combustibles
• Gas and electrical lines
• Combustible and explosive materials
• Chemical storage areas
• Areas of high chemical fume concentrations
• Provisions for accessibility to the heater
• Adequate clearances around air openings
• Combustion and ventilating air supply
• Vehicle parking areas
• Vehicles with lifts or cranes
• Storage areas with stacked materials
• Lights
• Sprinkler heads
• Overhead doors and tracks
• Dirty, contaminated environment
Placement of explosive objects, flammable objects, liquids and vapors close
to the heater may result in explosion, fire, property damage, serious injury or
death. Do not store, or use, explosive objects, liquids and vapor in the vicinity
of the heater.
Failure to comply with the published clearances to combustibles could result in personal injury, death and/
or property damage.
In locations used for the storage of combustible materials, signs must be posted to specify
the maximum permissible stacking height to maintain the required clearances from the
heater to the combustibles. Signs must either be posted adjacent to the heater thermostats
or in the absence of such thermostats, in a conspicuous location.
CAUTION
!
WARNING
!

54
DSC Series 1.0 Safety •Clearance to Combustibles
Chart 1.1 • Clearance to Combustibles in Inches (see Figure 1.1)
Figure 1.1 •Clearance to Combustibles
* Heaters mounted on an angle between 1° to 30° must maintain clearances posted for 0° or 30°;
whichever is greater.
Important! If the heater is mounted beneath a non-combustible surface an 8 in. minimum top clearance
must be maintained from the top of the heater to prevent overheating the controls.
Clearance to combustible distances represent a surface temperature of 90°F (32°C) above ambient
temperature. Ensure that building materials with a low heat tolerance (i.e, awnings, fabrics, plastics,
sprinklers, insulation) are protected against degradation. This may require the heater to be mounted at a
distance in excess of the published clearances to combustibles. Contact the factory or the building
material manufacturer for additional information.
Model No. BTU/h Voltage
Mounting
Angle* Sides Back Top Below Ends Front
DSC-31 31,000 24 VAC 0° 18 N/A 13 48 12 N/A
30° N/A 18 18 40 12 36
DSC-34 34,000 24 VAC 0° 18 N/A 13 48 12 N/A
30° N/A 18 18 40 12 36
SIDE VIEW
End End
Below
Side
Side
END VIEW - 0° MOUNTING ANGLE
Top (to ceiling)
Back
Top
(to ceiling)
Front
END VIEW - 30° MOUNTING ANGLE
Below
30˚
When installing the infrared heater system, the minimum clearances to combustibles must be maintained.
These distances are shown in Chart 1.1 and on the heater. If you are unsure of the potential hazards,
consult your local fire marshal, fire insurance carrier or other qualified authorities on the installation of gas
fired infrared heaters for approval of the proposed installation.

6
DSC Series
Standards, Certifications and Governmental Regulations
The installation of this heater must comply with all applicable local, state and national specifications,
regulations and building codes (contact the local building inspector and/or fire marshal for guidance)
before installing the heater system.
In the absence of local codes, the installation must conform to the latest edition of the National Fuel Code
ANSI Z223.1 (NFPA 54).
Refer to the following standards and codes for application specific guidelines:
Public Garages:
The installation of this heater in public garages must conform with the Standard for Parking Structures,
ANSI/NFPA 88A (latest edition), and must be at least 8 ft. above the floor.
Aircraft Hangars:
The installation of this heater in aircraft hangars must conform with the Standard for Aircraft Hangars,
ANSI/NFPA 409 (latest edition). The heater must be installed at least 10 ft. above the upper wing
surfaces and engine enclosures of the highest aircraft which might be stored in the hangar. In areas
adjoining the aircraft storage area, the heaters must be installed at least 8 ft. above the floor. The heaters
must be located in areas where they will not be subject to damage by aircraft, cranes, moveable
scaffolding or other objects.
High Altitude:
The installation of this heater is approved, without modifications, for elevations up to 2,000 ft. above MSL
(sea level). Contact Detroit Radiant Products Company for installations above these elevations.
Gas Connection:
To ensure your safety, and to comply with the terms of the warranty, all units must be installed in
accordance with these instructions. Under no circumstance should the gas supply line provide support to
the heater.
The gas supply to the infrared patio heater must be connected and tested in accordance with national,
state, provincial, and local codes along with the guidelines in the manual. In the United States refer to the
latest edition of the ANSI Z223.1 (NFPA 54) Standard; and in Canada, refer to the latest edition of the
CAN/ CGA B149.1 Standard.
Supply gas piping to the unit should conform to the local and national requirements for type and volume of
gas handled, and pressure drop allowed in the line. Avoid pipe sizes smaller than 1/2”.
1.0 Safety •Standards, Certifications and Government Regulations
WARNING
!
An approved connector, suitable for the environment of equipment usage, is required. Visible or excessive
swaying, flexing and vibration of the gas connections must be avoided to prevent failure. Neither the gas
pipe nor the connector shall be placed in the flue discharge area or in direct contact with infrared rays. In
no case shall the gas supply support or bear weight of the heater.

76
DSC Series 1.0 Safety •Standards, Certifications and Government Regulations
Electrical:
The heater, when installed, must be electrically grounded in accordance with the National Electrical Code
ANSI/NFPA 70 (latest edition). Under no circumstances is the electrical supply line to provide any
assistance in the suspension of the heater.
Ventilation:
This heater must be installed in accordance with the requirements set forth in this manual and with the
NFPA 54/ANSI Z223.1 National Fuel Gas Code (latest edition). See ventilation requirements on page 19.
Re-Verber-Ray®units comply or are certified by one or more of the following organizations or standards:
• CSA International Requirement (CSA 2.37).
• American National Standards Institute (ANSI Z83.26).
• Intertek (ETL)
• Occupational Safety and Health Act (OSHA).
• NFPA 54/ANSI Z223.1 - National Fuel Gas Code.
• NFPA 70/ANSI - National Electrical Code.
• IRSC - Infrared Heater Safety.

8
DSC Series
Safety Signs and Labels
It is important to provide warnings to alert individuals to potential hazards and safety actions. ANSI
Z83.26/CSA 2.37 requires you to post a sign specifying the maximum permissible stacking height to
maintain the required clearances from the heater to the combustibles near the heaters thermostat or in
absence of such thermostats in a conspicuous location.
Safety warning labels must be maintained on the infrared heater. Illustrations of the safety labels, and their
locations, are pictured below. In locations used for the storage of combustible materials, signs must be
posted to specify the maximum permissible stacking height to maintain the required clearances from the
heater to combustibles. Signs must either be posted adjacent to the heater device or in the absence of
such control in a prominent location.
Figure 1.2 •Heater Safety Label Locations
1.0 Safety •Safety Signs and Labels
F/N: LL01 - Clearance Safety Tag
(Affix adjacent to heater’s control
device).
Front Panel
4002434
SAMPLE
F/N: LLPCL004
Clearance to Combustibles Label
Side Panel
End Panel
F/N: LLPCL013 Logo Label
Rating Label
(inside panel)
F/N: LLDR009 (NG)
F/N: LLDR010 (LP)
Gas Type Label
Wiring Diagram (inside panel)
LLDR003
Provide 24 Volts

98
2.0 Installation
WARNING
!
DSC Series 2.0 Installation •Design
Read and understand, the installation, operating and maintenance instructions
thoroughly before installing or servicing this equipment.
Only trained, qualified gas installation and service personnel may install or service
this equipment.
Design
Re-Verber-Ray®Patio Heaters are designed specifically for comfort heating in an outdoor environment.
Examples of suitable applications include patios, porches, outdoor shopping areas, and outdoor
pathways. When used properly, the heaters will increase the comfort levels of its application. However, the
effectiveness of the heating will depend on many variables, such as air temperature, wind velocity, wind
barriers, mounting heights, and distance between heaters. To ensure a safe, properly designed heating
system, all of these variables should be considered prior to developing a layout for the infrared heaters.
It is important to note that the effectiveness of the heater may be diminished in environments with wind
velocities above 5 MPH. Wind barriers can be extremely effective in maintaining the effectiveness of the
heater and reducing the operational costs. However, if wind barriers are used, they must be designed in
such a way that allows for the necessary fresh air and ventilation for the proper heater operation. In
addition, all clearance to combustibles must be maintained at all times (See Chart 1.1 on page 5).
The infrared patio heaters may be laid out in a number of configurations depending on the structures
constraints of the application, heating requirements, and therefore, the basic recommendations of
installation. The minimum mounting height for all Re-Verber-Ray®Patio Heaters is 6.5 feet above the
finished floor.
The heater must always be operated in a location that allows uniform air pressure around the heater. If
one part of the heater is located outside of a wind protected zone, the heater may not properly function or
damage to the heater may occur. Consideration should be taken on how the wind will affect the heaters
after installation. IMPORTANT: Fire sprinkler heads must be located at an appropriate distance from the
heater to avoid accidental discharge of the fire suppression system. This distance may exceed the
published clearance to combustibles (see Chart 1.1 on pg. 5). Certain applications will require the use of
high temperature sprinkler heads or relocation of the heaters.
NOTICE
Radiant heat is capable of damaging or destroying certain materials or items. Do not store material or
items underneath the heater. Always maintain clearance to combustibles.
Fire sprinkler systems containing propylene glycol, antifreeze or other potentially flammable substances
shall not be used in conjunction with this heater without careful consideration for and avoidance of
inadvertent discharge hazards. For further information consult NFPA 13. Always observe applicable state
and local codes.
CAUTION
!

10
DSC Series
2.0 Installation •Heater Mounting •Optional Mounting Kit
Heater Mounting
The heater shall be mounted in a fixed position attached from a structure that can evenly support the total
force and weight of the heater. The mounting means shall be independent of the gas and electrical supply
line. All hangars and bracket material shall be of noncombustible construction. Examples of suitable
material include, but are not limited to, Steel channel, steel tubing, threaded rod, or field fabricated
hangers that are adequate to bear the load. In some cases, the heater may need to be isolated from
vibration with the use of vibration isolating devices.
The heater must be level from side to side and can be set at an angle between 0° and 30° from horizontal.
Figure 2.1 •Heater Dimensions
Optional Mounting Kit
Optional adjustable mounting kits and brackets are available for the Patio Heater. Refer to the insert that
was packaged with the mounting brackets for complete installation instructions.
WARNING
!
Improper suspension of the infrared heater may result in collapse and persons being
crushed. Always suspend from a permanent part of the building structure that can support
the total force and weight of the heater.
Failure to maintain minimum clearance to combustibles may result in fire and/or explosion,
property damage, serious injury or death. Always maintain minimum clearances and post
signs or provided tags (F/N: LL01) where needed. Signs should state the hazards for the
particular application and be legible for the building occupants. Consult the factory or a
factory representative for additional information on signage compliance.
END VIEWSIDE VIEW
2.75”
10.875”
9”
48.375”
9”

1110
DSC Series 2.0 Installation •Heater Mounting •Recommended Mounting Heights
Figure 2.2 •Heater Orientation
Chart 2.1 • Recommended Mounting Heights
Level end to end
Optional
Mounting
Bracket
0-30°
End End
NOTE: This chart is provided as a guideline. Actual conditions dictate variances from this data.
Recommended Mounting Heights
WARNING
!
Heater must be installed at least 6.5 feet above the finished floor.
BTU/h
Recommended
Mounting Height
Approximate
Coverage Area
Approx. Coverage
(sq. ft.)
31,000 8’-0” to 12’-0” 8’ x 8’ 64 sq. ft.
34,000 8’-6” to 13’-0” 9’ x 9’ 81 sq. ft.

12
Figure 2.3 shows different types of mounting configurations. Depending on the type of mounting you use,
be sure to:
1Prepare mounting surface. If necessary, weld blocks to mounting structure, drill holes, etc.
2Fasten beam clamp, screw hook or other type of suspension anchor to hanging point.
3Attach threaded rod and turnbuckle to anchor. Check that it is securely attached.
4Attach heater to turnbuckle. Adjust turnbuckle until the heater is level and equal weight distribution is
achieved. Threaded rod must be straight up and down, do not install threaded rod at an angle.
Figure 2.3 •Heater Mounting
DSC Series
2.0 Installation •Heater Mounting
Optional
Mounting bracket
attached to ceiling.
Optional Mounting
bracket attached to
wall.
0° Mounting Angle
30° Mounting Angle
30°
Mounting Angle
0°
Mounting Angle
30°
30°
Bar Joist Clip
Rigid threaded rod
and turnbuckle
(field supplied)

1312
DSC Series 2.0 Installation • Gas Supply
Gas Supply
The gas supply to the infrared patio heater must be connected and tested in accordance with national,
state, provincial, and local codes along with the guidelines in the manual. In the United States refer to the
latest edition of the ANSI Z223.1 (NFPA 54) standard; and in Canada, refer to the latest edition of the
CAN/ CGA B149.1 Standard.
Supply gas piping to the unit should conform to the local and national requirements for type and volume of
gas handled, and pressure drop allowed in the line. Avoid pipe sizes smaller than 1/2”.
IMPORTANT! Before connecting the gas supply to the heater:
• Verify that the heaters’ gas type (as listed on the rating plate) matches that of your application and the
installation complies with national and local codes and requirements of the local gas company.
• Unless otherwise noted on the rating plate, the infrared heater is designed and orificed to operate on
standard BTU gas. Contact the factory if utilizing non-standard BTU gas.
• Check that the gas piping and service has the capacity to handle the total gas consumption of all the
heaters being installed, as well as any other gas appliances being connected to the supply line.
• Check that the main gas supply line is of proper diameter to supply the required fuel pressures.
• If utilizing used pipe, verify that its condition is clean and comparable to a new pipe. Test all gas
supply lines in accordance with local codes.
The gas outlet must be in the same space as the appliance installation, and must be accessible. It may
not be concealed within or run through any wall, floor or partition. When installing the heater in a corrosive
environment (or near corrosive substances), use a gas connector suitable for the environment. Do not
use the gas piping to electrically ground the heater.
This heater is equipped to connect to ½” NPT gas pipe. All piping must be installed in accordance with the
requirements outlined in the National Fuel Gas Code ANSI/Z223.1 (latest edition) or CSA B149.1 and
B149.2. Support all gas piping with pipe hangers, metal strapping, or other suitable material. Do not rely
on the heater to support the gas pipe.
WARNING
!
Improperly connected gas lines may result in fire, explosion,
poisonous fumes, toxic gases, asphyxiation and death.
Connect gas lines in accordance to national, state, provincial
and local codes.
NOTICE
The total input to the appliance must fall within +/- 5% of the rated input as indicated on the rating plate.
Otherwise the burner may prematurely fail.

14
DSC Series
2.0 Installation •Gas Supply •Gas Connection
When connecting gas piping to the unit, the use of a thread joint compound is required. The thread
compound (pipe dope) shall be resistant to the action of liquefied petroleum gas or any other chemical
constituents of the gas to be conducted through the piping. Use of Teflon® tape is not permitted.
Install a ground joint union with a brass seat and a manual shut-off valve adjacent to the unit for
emergency shut-off and easy servicing of the controls. A 1/8” NPT plugged tap that is accessible for a test
gauge connection is also recommended as illustrated in Figures 2.4 and 2.5.
A sediment trap must be installed in the supply line in the lowest spot prior to connecting to the heater.
The trap length shall be at least three inches long. Ideally, the trap would be installed as close as possible
to the shut-off.
Chart 2.2 • Gas Consumption and Manifold Pressure (Inches W.C.)
To connect the gas:
Pressure Equivalents: 1 inch W.C. equals .058 oz./sq. in. equals 2.49 Mbar.
Model No. Input
Manifold
Pressure
Minimum
Inlet
Pressure
Maximum
Inlet
Pressure
Gas
Consumption
(CFH)
Gallons per
Hour
Orifice
Size
DSC-31N 31,000 6.0” W.C. 7.0 ” W.C . 14.0” W.C. 29.5 0.43 2.35 mm
DSC-31P 31,000 10.0” W.C. 11.0 ” W.C. 14.0” W.C. 12.4 0.34 1.65 mm
DSC-34N 34,000 6.0” W.C. 7.0 ” W.C . 14.0” W.C. 32.4 0.47 41 DMS
WARNING
!
!
Improperly connected gas lines may result in serious injury or death, explosion,
poisonous fumes, toxic gases, asphyxiation. Connect gas lines in accordance to national,
state, provincial and local codes.
WARNING
!
!
Conditions such as wind drafts or other variables can cause movement of the heater and
may require it to be rigidly mounted. Avoid excessive movement and/or vibration of the
gas connection by rigidly mounting the heater.

1514
DSC Series 2.0 Installation •Gas Supply •Gas Connection
Figure 2.4 •Gas Connection - End View (shown installed from above)
Drip leg / Sediment trap
(field supplied)
Elbow
Shut off valve /
inlet tap
(field supplied)
Ground
joint union
Tee
Elbow
Shut off valve/
inlet tap
(field supplied)
Elbow
Ground
joint union
NOTE: Do not exceed 14 inches W.C. to the
appliance. Use a regulator when gas supply
pressure exceeds 14 inches W.C.
Figure 2.5 •Gas Connection - End View (shown installed from below)
WARNING
!
!
Failure to disconnect the electricity to the heater before disconnecting the gas supply
may result in explosion, fire, property damage, injury or death.
To disconnect the gas:
1Disconnect the power to the heater.
2Turn off the gas supply to the heater and ”bleed” the gas line.
3Using two wrenches, slowly loosen the fittings. Excessive torque on the manifold may misalign the
orifice.
4Inspect the gas pipe. Replace if necessary.
5Always cap off and leak check any open gas lines that are not in use.

16
DSC Series
Leak Testing
Use a soap solution or equivalent for leak testing. Leak testing solution must be non-corrosive, and be
rinsed off immediately after the leak test. Never test for leaks with an open flame. Failure to comply could
result in personal injury, property damage or death.
Always leak test the final gas assembly for gas leaks according to the procedures outlined in NFPA 54
and all local codes/or standards.
For leak testing on pressures below ½ PSI
Before leak testing, close the field installed manual shut off valve shown in Figures 2.4 and 2.5 (pg. 15) on
the supply line to isolate the gas valve from the pressure. NOTE: All factory installed gas connections
have passed an approved leak test.
For leak testing on pressures above ½ PSI
When leak testing with pressures above ½ PSI (14 inches W.C.) the unit’s gas controls must be isolated
from the supply pipe. Close the field installed manuals shut off valve, disconnect the supply line to the
unit, and temporarily cap the supply line for testing purposes.
2.0 Installation •Gas Supply •Leak Testing
WARNING
!
!
Gas pressures to the appliance controls must never exceed 14 inches W.C. (1/2 PSI).
Supply pressures greater than 14 inches W.C. can damage the controls, resulting in
personal injury, property damage, or death.
WARNING
!
!
Testing for gas leaks with an open flame or other sources of ignition may lead to a fire or
explosion and cause serious injury or death. Test in accordance with NFPA or local codes.
WARNING
!
!
Failure to install, operate or service this appliance in the approved manner may result in
property damage, injury or death. This heater must be installed and serviced by trained gas
installations and service personnel only.
The installation of this heater must conform with local building codes or, in the absence of
such codes, the National Fuel Code (NFPA 54).

1716
DSC Series 2.0 Installation •Electrical Requirements
Electrical Requirements
All field wiring to the patio heater must be done in accordance with the national, state, provincial, local
codes and the guidelines in this manual. In the United States, refer to the most current revisions to the
Electrical Code ANSI/NFPA 70 and in Canada refer to the most current revisions of the Canadian
Electrical Code CSA C22.1 Part 1. The unit must be electrically grounded according to these codes.
This patio heater system is designed to operate on an external 24VAC electrical system. Provide only
24VAC with a NEC Class 2 transformer to the control wires inside the controls compartment. Use at least
18 AWG Solid core thermostat type wire that has an adequate capacity and temperature rating for the
total load. Never locate the transformer inside the controls compartment.
Installing the control wire
Each heater includes a rubber grommet to allow
for control wire to be brought into the unit with a
water resistant seal. Feed the control wire
through the grommet, piercing the rubber with
the wire. Ensure enough wire length is available
to make the proper connections. Tie the control
wire into a loose knot, as shown in Figure 2.6.
Ensure knot is loose enough to not cause any
damage to the wire. This will allow for a strain
relief for the connections to the heater.
Wiring: From the control wire, connect the
24VAC to the blue wire (labeled “24VAC”) inside
the control compartment. Then connect the
Common from the control wire to the green wire
(labeled “Common”). See Fig 2.8, page 18.
Controls Operation
This patio heater was designed for use in an outdoor environment. Therefore, controlling the heater by
use of a thermostat may not be the best means of temperature control. In an outdoor application, the air
temperature may not increase and never satisfy the thermostat. The preferred control device when
operating this heater in an outdoor area is a switching or timer device.
In an application where there are several wind breaks or a partially enclosed area, a thermostat can be
used.
NOTICE
The power supply to the heater must be within +/-5% of the voltage rating as indicated on the rating plate
of the appliance. If input power does not meet these specifications, contact your utility company.
WARNING
!
Incorrect or improper wiring may result in shock, injury or death. Field wiring to the heater
must be connected and grounded in accordance with national, state, provincial, local codes
and to the guidelines in this manual. Refer to the most current revisions to the ANSI/NFPA
70 Standard.
Figure 2.6 •Control Wire Installation
Loose Knot in
Control Wire
Control Wire
Connections

18
DSC Series
3.0 Maintenance •Wiring Diagrams
Figure 2.7 •Internal Wiring Diagram
IGNITION
MODULE
SPARK
SENSE
GROUND
VALVE -
THERMOSTAT
VALVE +
Figure 2.8 •Field Wiring Diagram
Starting Amp Draw: 0.65 Amp
Running Amp Draw: 0.48 Amp
Field Wiring:
124 VAC/20VA transformer (.8 Amp) per heater is required (supplied by installer).
2Maintain electrical polarity when hooking up multiple heaters.
3 Allow heaters to be switched by zones for heating flexibility.
4 Do not attempt to install transformer inside of heater.
IGNITION
MODULE
SPARK
SENSE
GROUND
VALVE -
THERMOSTAT
VALVE +
IGNITION
MODULE
SPARK
SENSE
GROUND
VALVE -
THERMOSTAT
VALVE +
IGNITION
MODULE
SPARK
SENSE
GROUND
VALVE -
THERMOSTAT
VALVE +

1918
DSC Series 2.0 Installation •Ventilation
Ventilation
This infrared heater must be vented in accordance with national, state, provincial and local codes and the
guidelines in this manual. Refer to the latest edition of the ANSI Z223.1 (NFPA 54) Standard.
It is required that the upper levels of the space to be heated are properly ventilated to supply combustion
air to the heaters and to sufficiently dilute the products of combustion. It is also important to keep the flue
discharge area clear of gas piping and electrical wiring (see Figure 2.9).
Provisions must also be made to provide sufficient fresh air intake area and exhaust air outlet area.
Natural or mechanical means shall be provided to supply and exhaust at least 4 CFM/1,000 BTU/h of total
gas input of heaters installed. Exhaust openings for the removal of flue products must be above the level
of the heater(s).
Where insufficient air movement exists, induced air displacement is required. A balanced system is
essential to avoid negative building pressure which causes excessive infiltration, unfavorable drafts and
affects combustion efficiency.
Air displacement may be accomplished by either gravity or mechanical means. Mechanical exhausters
are preferred and typically mounted at high points on the roof over where stagnant air accumulates inside.
For a flat roof, considerations of prevailing winds, high and low pressure areas, and distribution of air
movement must be taken into consideration when locating exhausters.
Best air distribution is accomplished by using a number of small exhausters versus one large exhauster.
Provide a minimum of one square inch of inlet area per 1,000 BTU/h for combustion air supply. Inlet
opening in the building should be well distributed, located high on the wall and should direct incoming air
upward to dilute products of combustion while preventing drafts at lower levels. Inlets are typically 1 to 3
sq. ft.
In certain applications, local codes may require that mechanical exhaust systems be interlocked with the
heaters to enable both to function simultaneously or allow control of exhausters with a ceiling mounted
humidistat.
Figure 2.9 •Hot Flue Discharge
WARNING
!
Improper or insufficient ventilation may result in explosion, fire, health
problems, carbon monoxide poisoning or death. Vent enclosed spaces and
buildings according to national, state, provincial and local codes.
Discharge released from side
air channels. Keep area clear of
gas piping and electrical wiring.

20
DSC Series
3.0 Operation
3.0 Operation •Sequence of Operation
Important! Before operating the heater, conduct the following safety procedures:
• Check for any possible gas leaks.
• Alert all persons about the hazards of high surface temperatures and to keep a safe distance away in
order to avoid burns and possible clothing ignition.
• Provide supervision when young children are in the area of the heater.
• Check to make sure clothing isn’t hung from the heater and that flammable materials are not
placed on or near the heater.
• Check that all guards or protective devices are in place and secure.
• Check control compartment, burners and circulating air passages for debris. If necessary, clean the
debris.
Sequence of Operation
Starting Circuit:
When voltage is applied to the controls connection, the ignition module sends power to the gas valve
while simultaneously sending spark to the igniter. The ignition time is 15 seconds. Once the flame on the
burner is established, the ignition module will continuously monitor the flame. The heater will continue to
run as long as there is 24VAC present in the call for heat. If the heater does not light on the first trial, the
heater will attempt two more ignitions prior to going into a lockout mode.
Running Circuit:
After ignition, the flame rod monitors the flame. As long as a flame is present, the valve is held open. If the
flame is lost, the control acts to close the valve within one second, and a new trial sequence identical to
that at start-up is initiated. If proof of flame is not established within the 15 second trial for ignition, the unit
will retry two additional times before entering lockout mode. If lockout occurs, the control can be reset by
briefly interrupting the power source.
WARNING
!
Improper operation of the heater may result in explosion, fire,
shock and carbon monoxide poisoning. Follow all guidelines and
warnings in this manual and national, state, provincial and local
codes. Always conduct safety checks before operating the heater.
Do not operate the heater in unsafe conditions.