Detroit Radiant Products DR 160 User manual

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.
Only trained, qualified gas installation and service personnel may install or service
this equipment. Failure to comply could result in personal injury, asphyxiation, death,
fire 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.
Not for residential use!
This heater is not approved in any residential application. This includes (but is not limited to) the home,
living quarters, attached garages, etc. Installation in residential indoor spaces may result in property
damage, asphyxiation, serious injury or death.
WARNING
!
!
For Your Safety
If you smell gas:
• Do not try to light any appliance. • Immediately call your gas supplier from a neighbor’s phone.
• Do not touch any electrical switch. • Follow the gas supplier’s instructions.
• Do not use any phone in your building. • If you cannot reach your gas supplier, call the fire department.
Keep these instructions for future reference.
DR Series Manual
Detroit Radiant Products Co.
All persons involved with the installation, operation and maintenance of the heater system must read and
understand the information in this manual.
Installation, Operation
Maintenance and Parts
LIODR-Rev. 25911
Print: 5M-10/12_r2-10/13(CDS)
Replaces: LIODR-5M-9/11(CDS)

DR Series Manual
2
Contents
1.0 Safety.................................................................... 3
Safety Symbols ....................................................... 3
Applications .......................................................... 3
Clearance to Combustibles .............................................. 4
Gas Connection....................................................... 6
Standards, Certifications and Government Regulations ........................ 6
Safety Signs and Labels ................................................ 8
2.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Heater Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Total Area Heating ..................................................10
Spot Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Heater Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Ventilation ...........................................................14
Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Electrical ............................................................17
3.0 Operation ................................................................19
4.0 Maintenance ..............................................................20
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Heater Assembly Components ...........................................22
Parts Listing..........................................................23
5.0 Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

NOTICE
WARNING
!
!
CAUTION
!
WARNING
!
!
WARNING
!
!
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2 3
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.
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 marshall, insurance carrier and other
authorities for approval of the proposed installation.
Commercial / Industrial
Infrared heaters are designed and certified for use in industrial and commercial buildings such as
warehouses, manufacturing plants, aircraft hangars and vehicle maintenance shops. For maximum safety,
the building must be evaluated for potential hazards before installing the heater system. A critical safety
factor to consider before installation is the clearance to combustibles.
Not For Residential Use.
Installation of an infrared heater system in residential indoor spaces, RV’s,
mobile homes, etc. may result in property damage, asphyxiation, fire, serious
injury or death.
Residential
This heater is NOT approved for use in any residential application. This includes, but not limited to,
attached garages, living quarters, solariums, etc. Consult the local fire marshal and/or insurance provider
if unsure of your application.
1.0 Safety
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.

CAUTION
!
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4
1.0 Safety •Clearance to Combustibles
Clearance to Combustibles
Combustible Items Include: Moving Objects Include:
• Wood • Overhead doors
• Paper • Vehicles on lifts
• Fabric • Cranes
• Chemicals • Hoists
• Wall or roof insulation • Car wash equipment
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 marshall, fire insurance carrier or other qualified authorities on the installation of gas
fired infrared heaters for approval of the proposed installation.
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:
Hazards Include:
For maximum safety the building must be evaluated for hazards before installing the heater system.
Examples include, but are not limited to:
• 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
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.
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.
Signs shall be posted specifying the maximum permissible stacking height in order to
maintain clearances to combustibles.

20° - 35°
Below
Top
Front
Back
Manifold or
Control End
SideSide
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4 5
1.0 Safety •Clearance to Combustibles
Chart 1.1 • Clearance to Combustibles in Inches (see Figure 1.1)
Model No. Sides Back Top Below/Front
DR 30 (S) 30 18 28 72
DR 45 30 18 28 72
DR 50 30 18 34 72
DR 55 32 18 40 72*
DR 60 32 18 40 72*
DR 75 48 30 42 98
DR 80 48 30 42 98
DR 85 48 30 42 98
DR 90 48 30 42 98
DR 95 48 30 52 120
DR 100 48 30 52 120
DR 130 48 30 52 120
DR 160 50 32 60 132
* This clearance is 80 in. when the heater is fitted with a parabolic reflector.
NOTE: If the heater is mounted beneath a non-combustible surface, a 24 in. minimum top clearance must
be maintained from the top of the heater to prevent overheating the controls.
Figure 1.1 •Clearance to Combustibles
Mount Heater Level
- Side to Side -
FRONT VIEW SIDE VIEW

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1.0 Safety •Gas Connection •Standards, Certifications and Government Regulations
Standards, Certifications and Government Regulations
Installation of this infrared heater must comply with all applicable local, state and national specifications,
regulations and building codes. Contact the local building inspector and/or fire marshall for guidance.
In the absence of local codes, the installation must conform to the latest edition of:
United States: National Fuel Gas Code, ANSI Z223.1 (NFPA 54).
Canada: CAN/CGA B149.1 and .2, Canadian Electrical Code C22.1
WARNING
!
To ensure your safety, and comply with the terms of the warranty, all units must be installed in accordance
with these instructions.
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’. In no case shall the gas supply support the weight of the heater.
Gas Connection
The heater must be electrically grounded in accordance with the following codes:
United States: Refer to National Electrical Code®, ANSI/NFPA 70 (latest edition).
Wiring must conform to the latest edition of National Electrical
Code®, local ordinances, and any special diagrams furnished.
Canada: Refer to Canadian Electrical Code CSA C22.1 Part 1 (latest edition).
The space being heated by unvented heaters must meet ventilation requirements.
Electrical
Venting
Building
Aspect Codes and Guidelines
Chart 1.2 • Standards and Code Installation Guidelines •Building Aspect

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6 7
Detroit Radiant Products units comply or are certified by one or more of the following
organizations or standards:
• CSA Design Certified (CSA 2.35).
• American National Standards (ANSI Z83.19).
• Underwriters Laboratory (UL).
• Certification of Europe (CE).
• Infrared Heater Safety Council. (IRSC).
Building
Type
Installation of this infrared heater in public garages must conform to the following codes:
United States: Standard for Parking Structures NFPA 88A (latest edition) or the
Code for Motor Fuel Dispensing Facilities and Repair Garages NFPA 30A (latest edition).
Canada: Refer to CAN/CGA B149.1 and B149.2: Installation Codes for Gas
Burning Appliances.
Guidelines:
• Heaters must not be installed less than 8 ft. (2.4 m) above the floor. Minimum
clearances to combustibles must be maintained from vehicles parked below the
heater.
• When installed over hoists, minimum clearances to combustibles must be maintained
from the upper most point of objects on the hoist.
Installation of this infrared heater in aircraft hangars must be in accordance with the
following codes:
United States: Refer to Standard for Aircraft Hangars, ANSI/NFPA 409 (latest edition).
In Canada:Refer to Standard CAN/CGA B149.1 and B149.2.
Guidelines:
• In aircraft storage and servicing areas, heaters shall be installed at least 10 ft. (3 m)
from above the upper surface of wings or of the engine enclosures of the highest
aircraft that may be housed in the hangar. The measurement shall be made from the
wing or engine enclosure, whichever is higher from the floor, to the bottom of the
heater.
• In areas adjoining the aircraft storage area (e.g., shops, offices) the bottom of heaters
shall be installed no less than 8 ft. (2.4 m) above the floor.
• Suspended or elevated heaters shall be located in spaces where they shall not be
subject to damage by aircraft, cranes, movable scaffolding or other objects.
Provisions shall be made to assure accessibility to suspended infrared heaters for
recurrent maintenance purposes.
Public
Garages
Aircraft
Hangars
Chart 1.3 • Standards and Code Installation Guidelines •Building Type
Codes and Guidelines
1.0 Safety •Standards, Certifications and Government Regulations

®
DETROIT RADIANT PRODUCTS COMPANY
21400 HOOVER ROAD - WARREN, MI
RE-VERBER-RAY INFRA-RED RADIANT HEATER
FOR OUTDOOR USE AND INDOOR (Non-Residential) INSTALLATION ONLY.
High - Intensity Infrared Heater
Class IIIA Permanent Label
[phone] - www.drp-co.com
Volts AC:
AMPS - Starting:
AMPS - Running:
Heater Type:
120V - 60Hz
0.1
0.1
C1
DESIGN COMPLIES WITH:
ANSI Z83.20-2001-GAS FIRED LOW INTENSITY INFRA-RED HTR.
Manifold Pressure:
Maximum Inlet Pressure:
Minimum Inlet Pressure:
6.0 in.
14 in.
7.0 in.
W.C.P.
W.C.P.
W.C.P.
Serial No. 08 07 DRPC 123456 0001
MODEL NO.
DR60-NFS-2 120
Heater Type
Minimum Mounting Angle:
Maximum Mounting Angle:
C1
20
35
DEGREES
DEGREES
INPUT BTU/H
60,000
FOR USE WITH
Natural Gas
VERSION
05/97
DR Series Manual
8
Safety Signs and Labels
It is important to provide warnings to alert individuals to potential hazards and safety actions. ANSI Z83.19
and the National Fuel Gas Code require you to post a sign “specifying the maximum permissible stacking
height to maintain the required clearances from the heater to the combustibles” near the heater’s
thermostat or in absence of such thermostats in a conspicuous location. Signs should state the hazards
for the particular application and be legible to the building occupants. Consult the factory or a factory
representative for additional information on signage compliance.
Safety warning labels must be maintained on the
infrared heater. Illustrations of the safety labels,
and their locations, are pictured below.
1.0 Safety •Safety Signs and Labels
Back View
Bottom View
F/N: LLDCL002
Clearance to Combustibles Label
SAMPLE
®
DETROIT RADIANT PRODUCTS COMPANY
21400 HOOVER ROAD - WARREN, MI
RE-VERBER-RAY INFRA-RED RADIANT HEATER
FOR OUTDOOR USE AND INDOOR (Non-Residential) INSTALLATION ONLY.
High - Intensity Infrared Heater
Class IIIA Permanent Label
[phone] - www.drp-co.com
Volts AC:
AMPS - Starting:
AMPS - Running:
Heater Type:
120V - 60Hz
0.1
0.1
C1
DESIGN COMPLIES WITH:
ANSI Z83.20-2001-GAS FIRED LOW INTENSITY INFRA-RED HTR.
Manifold Pressure:
Maximum Inlet Pressure:
Minimum Inlet Pressure:
6.0 in.
14 in.
7.0 in.
W.C.P.
W.C.P.
W.C.P.
Serial No. 08 07 DRPC 123456 0001
MODEL NO.
DR60-NFS-2 120
Heater Type
Minimum Mounting Angle:
Maximum Mounting Angle:
C1
20
35
DEGREES
DEGREES
INPUT BTU/H
60,000
FOR USE WITH
Natural Gas
VERSION
05/97
Rating Plate
F/N: LLDR002
F/N: LL01 - Clearance
Safety Tag
(Affix adjacent to
heater’s thermostat)

2.0 Installation
WARNING
!
CAUTION
!
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8 9
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
To ensure a safe, properly designed heating system, a layout should be developed for the correct
placement of the infrared heater(s). Aside from safety factors such as clearance to combustibles (see
Chart 1.1 on page 5), you should take also into consideration the environment (e.g., cold/drafty, average,
protected), heat coverage (sq. ft.) needed, heater centers, the distance behind a person or work station(s)
and exhaust path. Also, the effective infrared surface temperature of a person or object may be
diminished with wind above 5 mph. Wind barrier(s) may be required. Most importantly, clearance to
combustibles must always be maintained! Refer to hazards on page 4.
This installation manual, along with national, state, provincial and local codes, address these issues. It is
critical that you read, understand and follow all guidelines and instructions. Always inspect and evaluate
the mounting conditions, space for exhaust, gas supply and wiring.
Perimeter mounting of infrared heaters provides the most effective distribution of heat. The recommended
spacing between the heaters is shown in Chart 2.1. Add additional heaters in the center of the space
when heaters are spaced farther than the recommended distance (see Figure 2.1 ).
When heated, materials high in hydrocarbons (solvents, paint thinner, mineral spirits, formaldehydes, etc.)
can evaporate. This may result in odors or fumes being emitted into the environment. To correct this
problem, clean the area and/or introduce additional ventilation. Heaters installed and serviced in
accordance with the installation manual do not emit foul odors into the environment.
IMPORTANT: Fire sprinkler heads must be located at an appropriate distance from the heater. This
distance may exceed the published clearance to combustibles. Certain applications will require the use
of high temperature sprinkler heads or relocation of the heaters.
Sprinkler systems containing propylene glycol or other flammable substances are not to be used in
conjunction with this heater without careful consideration for and avoidance of potential fire or explosion
hazards. For further information consult NFPA 13. Always observe applicable state and local codes.
This heater cannot be used in a building with an uninsulated roof or condensation problems can occur.

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10
2.0 Installation •Heater Placement
Model No.
Distance
Between
Heaters
Dim. B (ft.)
Distance
Between
Heater Rows
Dim. C (ft.)
Distance
Between
Heater
and Wall (ft.)
DR 30(S) 12-14 12-15 8-24 15-40 4-8
DR 45 12-14 16 -19 12-36 15-55 6-12
DR 50 12-14 17-20 12-36 15-55 6-12
DR 55 13-15 18-21 12-36 15-55 6-12
DR 60 14-16 18-21 12-36 15-55 6-12
DR 75 15-17 19-22 16-48 20-70 6-12
DR 80 15-17 19-22 16-48 20-70 6-12
DR 85 16-18 21-25 16-48 20-70 6-12
DR 90 16-18 21-25 16-48 20-70 6-12
DR 95 17-20 21-25 16-48 20-70 6-12
DR 100 17-20 23-27 16-48 20-70 6-12
DR 130 21-24 26-32 20-60 25-85 8-14
DR 160 24-28 29-35 24-65 30-100 8-14
Chart 2.1 • Recommended Mounting Heights and Distances for “Total Area” Heating
Figure 2.1 •Total Area Heating Sample Layout
Key
Infrared heater
Exhauster
Thermostat
Air intake louver
A
B
Perimeter mounting
Perimeter and center row mounting
A
B
Mounting Heights Dim. A
30º Angle
Standard
Reflector (ft.)
30º Angle
Parabolic
Reflector (ft.)
Factory recommended mounting heights are listed as a guideline. If infrared heaters are mounted too low or
too high, they may result in discomfort or lack of heat. Detroit Radiant Products Company generally
recommends observing the recommended mounting heights to optimize comfort conditions. However,
certain applications such as spot heating, freeze protection, outdoor patio heating or very high ceilings may
result in the heaters being mounted outside of the recommended mounting heights.
C

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10 11
Model & Input Type of Area (Surroundings) Approx. Area Covered Approx. Coverage (sq. ft.)
Recommended Mounting Height (Dim. A)
Distance Behind Person or Work Station (Dim. B) Centers for Full Coverage (Spot & Area) Htg. Only
10’ 12’ 14’ 16’ 18’ 20’ 22’ 24’ 26’ 28’ 30’
DR-30
30,000
BTU/h
Cold/Drafty 10’ x 10’ 100 9’ 4’ 10’
Average 12’ x 12’ 144 10’ 12’ 5’ 12’
Protected/Insul. 14’ x 14’ 196 12’ 14’ 6’ 14’
DR-45
45,000
BTU/h
Cold/Drafty 12’ x 12’ 144 10’ 12’ 5’ 12’
Average 14’ x 14’ 196 12’ 14’ 6’ 14’
Protected/Insul. 16’ x 16’ 256 14’ 16’ 7’ 16’
DR-60
60,000
BTU/h
Cold/Drafty 16’ x 16’ 256 12’ 14’ 6’ 16’
Average 18’ x 18’ 324 14’ 16’ 7’ 18’
Protected/Insul. 20’ x 20’ 400 16’ 18’ 8’ 20’
DR-75
75,000
BTU/h
Cold/Drafty 18’ x 18’ 324 14’ 16’ 7’ 18’
Average 22’ x 22’ 484 16’ 18’ 8’ 22’
Protected/Insul. 26’ x 26’ 676 18’ 20’ 9’ 24’
DR-90
90,000
BTU/h
Cold/Drafty 20’ x 20’ 400 16’ 18’ 9’ 20’
Average 24’ x 24’ 576 18’ 20’ 10’ 24’
Protected/Insul. 28’ x 28’ 784 20’ 11’ 26’
DR-95
95,000
BTU/h
Cold/Drafty 24’ x 24’ 576 18’ 10’ 24’
Average 28‘ x 28’ 784 18’ 20’ 11’ 26’
Protected/Insul. 32’ x 32’ 1024 20’ 12’ 26’
DR-100
100,000
BTU/h
Cold/Drafty 24’ x 24’ 576 18’ 10’ 24’
Average 28‘ x 28’ 784 18’ 20’ 11’ 26’
Protected/Insul. 32’ x 32’ 1024 20’ 12’ 30’
DR-130
130,000
BTU/h
Cold/Drafty 26’ x 26’ 676 18’ 11’ 26’
Average 30’ x 30’ 900 18’ 20’ 12’ 28’
Protected/Insul. 35’ x 35’ 1225 20’ 22’ 13’ 32’
DR-160
160,000
BTU/h
Cold/Drafty 28’ x 28’ 784 20’ 22’ 12’ 28’
Average 35’ x 35’ 1225 24’ 26’ 16’ 32’
Protected/Insul. 40’ x 40’ 1600 28’ 30’ 20’ 35’
Chart 2.2 • Recommended Mounting Heights and Distances for “Spot” Heating
2.0 Installation •Heater Placement
A
B
Figure 2.2 •Spot Heater Heights

Figure 2.3 •Heater Mounting
Rigid threaded rod
Control
End Down
SIDE VIEW
20˚ - 35˚
Steel “C” clamp
Chain hanging set
Closed “S” hook
(typical)
SIDE VIEW
Control
End Down
20˚ - 35˚
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12
2.0 Installation •Heater Mounting
WARNING
!
Heater Mounting
Improper suspension of the infrared heater may result in collapse and 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 to the building occupants. Consult the factory or a
factory representative for additional information on signage compliance.
The heater can be suspended with chains or rigid threaded rod. Local codes, or conditions that would
cause the unit to move (e.g., wind drafts, blowers, crane rails, etc.), may require rigid threaded rod.
Consult all applicable codes before installation.
The heater must be level from side to side and between 20° and 35° from horizontal. The pilot burner or
ignitor, manifold and controls must be located on the lower end. Refer to figures 2.3 and 2.4.
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’. In no case shall the gas supply support the weight of the heater.

Mount 20˚ - 35˚
from horizontal
DR Series Manual
12 13
2.0 Installation •Heater Mounting
Figure 2.4 •Heater Orientation
Figure 2.5 •Gas Connection
Steel C-clamp
Chain hanging set
Mount Heater Level - Side to Side
Pilot/spark electrode
must be in lower
right corner.
(excludes DR30S)
Manifold control box must be located towards
the lower end of the heater (towards the floor).
Drip Leg/Sediment Trap
NOTE: Use a
regulator when gas
supply pressure
exceeds 14” W.C.P.
Do not exceed 14”
W.C.P to the
appliance.
Ball Valve / Inlet Tap
Disconnect switch
Stainless Steel Gas Connector, formed into
a smooth C-Shape (Field Supplied)
Not for use with rigidly mounted heaters.
SIDE VIEW
FRONT VIEW
SIDE VIEW
20˚ - 35˚
TOP VIEW

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14
Ventilation
WARNING
!
Insufficient ventilation may result in health problems, carbon monoxide
poisoning or death. Vent enclosed spaces and buildings according to
national, state, provincial and local codes.
Improper venting may result in asphyxiation, fire, explosion, injury or death.
2.0 Installation • Ventilation
It is required that the levels where heaters are mounted be properly ventilated to supply combustion
air to the heaters and to sufficiently dilute the products of combustion. It is also required that the flue
discharge area is kept clear of gas piping and electrical wiring (see Figure 2.6).
This infrared heater must be vented in accordance with national, state, provincial and local codes and the
guidelines in this manual. In the United Sates refer to the latest edition of ANSI Z223.1 (NFPA 54) and in
Canada refer to the latest edition of the CAN/CGA B149.2 Standard.
Provisions must also be made to provide sufficient fresh air intake area and exhaust air outlet area. For
proper ventilation, a positive air displacement of 4 cfm/1,000 BTU/h of gas consumed must be provided.
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 natural or mechanical means. Mechanical exhausters
are preferred and typically mounted at high points on the roof where stagnant air accumulates inside
the building. 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 (see Figure 2.1) high in the sidewalls 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.
Local codes may require that mechanical exhaust systems be interlocked with heaters to enable both to
function simultaneously (see page 17, Figure 2.7) or allow control of exhausters with a ceiling mounted
humidistat.
Figure 2.6 •Hot Flue Discharge
Flue Discharge Area
Important! Do not
install gas piping or
electrical wiring above
the flue discharge
area! Manifold/Control
End Down
SIDE VIEW
20˚ - 35˚

DR Series Manual
14 15
2.0 Installation •Gas Supply
Gas Supply
WARNING
!
Improperly connected gas lines may result in fire, explosion,
poisonous fumes, toxic gases, asphyxiation or death.
Connect gas lines in accordance to national, state, provincial
and local codes.
Important! Before connecting the gas supply to the infrared heater(s):
• Check that the gas piping and service has the capacity to handle the load of all 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.
• Test and confirm that inlet pressures are correct. Refer to the rating plate for required minimum
and maximum pressures (see Chart 2.3). The gas supply pipe must be of sufficient size to
provide the required capacity and inlet pressure to the heater (if necessary, consult the local
gas company).
Chart 2.3 • Manifold Pressure
Pressure Equivalents: 1 inch W.C. equals .058 oz/sq. in. equals 2.49 Mbar.
Note: Check manifold pressure at the tap located either at the outlet of the gas valve or on the gas
manifold pipe. Readings will be above atmospheric pressure during operation.
This heater must be installed and serviced by trained gas installation 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).
WARNING
!
!
Failure to install, operate or service this appliance in the approved manner may result in
property damage, injury or death.
To connect the gas:
The gas supply to the infrared heater must be connected and tested in accordance with national, state,
provincial and local codes along with the guidelines in the Detroit Radiant DR Series 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 B149.2 Standard.
Type of Gas
Required Manifold
Pressure
Minimum Inlet
Pressure
Maximum Inlet
Pressure
Natural 6.0 Inches W.C. 7.0 Inches W.C. 14.0 Inches W.C.
Liquefied Petroleum 10.0 Inches W.C. 11.0 Inches W.C. 14.0 Inches W.C.

DR Series Manual
16
The gas outlet must be in the same room as the appliance and accessible. It may not be concealed within
or run through any wall, floor or partition.
1Install a sediment trap / drip leg if condensation may occur at any point of the gas supply line. This will
decrease the possibly of loose scale or dirt in the supply line entering the heater’s control system and
causing a malfunction. Note: High pressure gas above 14 in. W.C.P. (water column pressure) requires
a high pressure regulator and ball valve (field supplied).
2Form the stainless steel flexible connector (field supplied) into a smooth C-shape allowing 12 in.
between the flexible connector’s end nuts. Figure 2.5 on page 13. NOTE: Not for use on rigidly
mounted heaters.
3Attach the ball valve (field supplied) to the gas supply pipe. Apply pipe compound to NPT adapter
threads to seal the joint. Use only a pipe compound resistant to liquid petroleum.
NOTE: Provide a 1/8 in. NPT plugged tapping accessible for test gauge connection immediately
upstream of gas connection to the heater (provided on ball valve, when supplied).
4Attach the flexible connector to the adapter and gas inlet. Seal the joints.
Note: Excessive torque on the manifold may misalign the orifice. Always use two wrenches to tighten
mating pipe connections.
5Final assembly must be tested for gas leaks according to NFPA or local codes.
2.0 Installation •Gas Supply
CAUTION
!
The fittings (nuts) on the flexible connector must be connected to an adapter. They may not be
directly connected to the gas supply pipe.
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
!
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’. In no case shall the gas supply support the weight of the heater.
CAUTION
!
In high moisture or corrosive environments, use gas supply lines and connectors suitable for the
environment. Periodically inspect for signs of failure or leakage.

DR Series Manual
16 17
2.0 Installation •Electrical
WARNING
!
Electric Shock
Field wiring to the heater must be connected and grounded in accordance with national,
state, provincial, local codes and to the guidelines in the this manual. In the United States
refer to the most current revisions to the ANSI/NFPA 70 Standard and in Canada refer to the
most current revisions the CSA C22.1 Part I Standard.
Control systems are initiated by either 120 VAC, 24 VAC or millivolt energy. The 120 VAC systems can be
used directly from a 120 VAC line. On 24 VAC systems, transformers must be used to supply power of
sufficient VA rating for single or multiple connected installations.
Important! Proper grounding and polarity are essential for heaters with spark ignition controls. If the
system is not properly grounded, it cannot determine the presence of a flame and will lockout and shut off.
Millivolt systems require NO external power, as energy needed to operate the valve is developed by the
power-pile generator. Do not use multiple connections, as one thermostat may only control one heater.
For wiring of controls on the unit see the wiring diagram included on page 18. It is recommended that the
thermostat be installed on the hot side of a fused supply line and have a sufficient ampere capacity rating
for the heater(s) it will control. The ventilation system may be controlled separately from the heating
system (consult local codes) by the use of a humidistat that closes when the humidity rises. The
humidistat control should be installed at roof level. For summer ventilation, a simple on/off switch can be
installed at the occupant level.
Electrical
Thermostat
Hot
Neutral
Exhaust
Fan
DR Series
Heater
DR Series
Heater
DR Series
Heater
Figure 2.7 •Typical Field Wiring
Transformer
(required on
24V heaters)

L1
ELECTRODE
ASSEMBLY
GAS VALVE
120VAC DSI MODULE
O
W
BK
W
W
BK
BK
G
GG
L2
W
BK
SENSE
NEUTRAL
THERMOSTAT
NEUTRAL
VALVE
GROUND
HIGH
VOLTAGE
W
ELECTRODE
ASSEMBLY
GAS VALVE
24VAC DSI MODULE
O
W
BK
W
BL
G
G G
(COMMON)
N/PFS-2 24VAC
LLWDR002REV. 1
(24VAC)
SENSE
GROUND
NEUTRAL
THERMOSTAT
VALVE HIGH
VOLTAGE
DR Series Manual
18
2.0 Installation •Wiring Diagrams
Wiring Diagrams
Figure 2.8 • NMV-2/PMV-2 • 750 Schematic
• Millivolt Control
Figure 2.9 • NFS-2/PFS-2 (24V) • 24 V Schematic
• Direct Spark
Ignition
• VA Draw: 12
• Amps: .48
• Potted Circuit
Board
Figure 2.10 • NFS-2/PFS-2 (120V) • 120 V Schematic
•Direct Spark
Ignition
•VA Draw: 12
•Amps: .10
• Potted Circuit
Board

DR Series Manual
18 19
WARNING
!
3.0 Operation
3.0 Operation •Lighting Instructions
Do not attempt to ignite a direct spark ignition heater by hand. Failure to comply could
result in personal injury, property damage, explosion, fire or death.
Direct Spark Ignition (NFS-2 / PFS-2)
Lighting Instructions
1Rotate the heater’s valve knob to the “ON” position.
2Close electrical circuit (typically the thermostat).
3If the heater fails to light, turn off gas, open electrical circuit and wait 5 minutes before repeating the
above steps.
Shutdown Instructions
1Open electrical circuit.
2Rotate the heater’s valve knob to the “OFF” position.
Sequence of Operation
Starting Circuit: Upon a call for heat, voltage is applied to L1 and Neutral. After a pre-purge, the spark
electrode is energized and the gas valve opens. The trial for ignition is 15 seconds. If flame is not
sensed, the heater will attempt two more times to reignite.
Running Circuit: After ignition, the sensing electrode monitors the burner flame. If sense of flame is lost,
the control immediately acts to reignite the gas-air mixture. If flame sense is not established within 15
seconds, the heater will attempt two additional ignition sequences before proceeding to hard lockout. The
control can be reset by briefly interrupting the power source.
Millivolt (NMV-2 / PMV-2)
Lighting Instructions
1Purge main gas supply line.
2Slightly depress and rotate the heater’s manual gas valve knob COUNTERCLOCKWISE from the
“OFF” position to the “PILOT” position.
3Fully depress the manual gas valve knob and light the pilot burner. Continue to depress for 30
seconds and then release.
4Rotate the heater’s valve knob to the “ON” position.
5Close the control circuit. If the heater fails to light, turn off the gas, open control circuit and wait 5
minutes before repeating the above steps.
Shutdown Instructions
1Open the control circuit.
2
Rotate the heater’s valve knob to the “PILOT” position, depress slightly and rotate to the “OFF” position.
Sequence of Operation
Starting Circuit: After manually lighting the pilot (see lighting instructions), upon a call for heat, the main
burner solenoid is energized. The gas valve opens and the pilot lights the main burner.
Running Circuit: After ignition, the powerpile monitors the pilot flame. If the pilot flame is lost, the
powerpile cools and closes the valve within 180 seconds. See lighting instructions to relight the heater.
Upon satisfactory completion of the electrical supply and purging of the gas supply line to the heater(s),
follow the lighting instructions on the heater’s rating label to put the heater into operation.

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20
4.0 Maintenance
4.0 Maintenance •Maintenance Checks
Main Burner
1Gently use an air hose to blow any
accumulated dust and/or dirt off the heater.
Air hose pressure must not exceed 30 psig.
2Gently pass the air hose over the entire
exposed area of the ceramic. A distance of
2’ to 4’ from the unit is recommended.
NOTE: Blowing out the gasket material will
permanently damage the rayhead.
3Gently place the air hose outlet into each
venturi tube and allow the air to flow for
approximately one minute.
4See troubleshooting chart (page 21) if there
are any signs of burner malfunction. Replace
if necessary.
Pilot Burner
1Remove pilot access door.
2Use an air hose and gently blow the pilot
burner free of dust or debris.
Gas Supply
1Periodically inspect the gas supply for signs
of corrosion or failure. Replace if necessary.
WARNING
!
Use protective glasses when cleaning
the heater.
Disconnect power to heater before
servicing.
Do not operate unit if repairs are
necessary. Do not operate unit
showing any signs of burner
malfunction. Call a professional for
assistance.
Avoid Equipment Failure.
Do not blow out heating elements
with high pressure air.
CAUTION
!
It is recommended that the following become a standard yearly procedure to obtain maximum operating
efficiency and trouble free operation.
During long periods of non-usage, remove or cover heater with a polyethylene bag and shut off gas
supply. If further service to the heater is desired, contact your representative or the factory.