Detroit Radiant Products PH Series User manual

WARNING
!
!
Keep these instructions for future reference.
For Your Safety
If you smell gas:
• Shut off gas to the appliance. • Call your gas supplier. Do not use any phone in your building.
• Extinguish any open flame. • Follow the gas supplier’s instructions.
• Do not try to light any appliance. • If you cannot reach your gas supplier, call the fire department.
• Do not touch any electrical switch.
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.
Not for indoor residential use. 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.
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.
Maintain clearance to combustibles.
Form No. LIOPH-4/07 (DRP)
Replaces Form No. LIOPH-2M-1/07
PH 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

Contents
1.0 Safety....................................................................3
Warning Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Applications..........................................................3
ClearancetoCombustibles..............................................4
GasConnection.......................................................6
Standards, Certifications and Government Regulations. . . . . . . . . . . . . . . . . . . . . . . . 6
SafetySignsandLabels................................................8
2.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Heater Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
ElectricalRequirements ................................................16
Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.0 Operation ................................................................18
SequenceofOperation.................................................18
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.0 Maintenance ..............................................................20
Periodic Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.0 Parts ....................................................................22
6.0 Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2

NOTICE
WARNING
!
!
CAUTION
!
WARNING
!
!
WARNING
!
!
Warning Symbols
Safety is the most important consideration during installation, operation and maintenance of the infra-red
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.
3
1.0 Safety •Warning 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
Infra-red heaters are designed and certified for use in industrial and commercial buildings such as
outdoor restaurant patios, 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 Indoor Residential Use. Installation of a infra-red 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.
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.
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.

1.0 Safety •Clearance to Combustibles
4
Clearance to Combustibles
Combustible items: Moving Objects:
• Wood • Overhead doors
• Paper • Vehicle lifts
• Fabric • Cranes
• Chemicals • Hoists
• Wall or roof insulation • Car wash equipment
When installing the infra-red heater system, the minimum clearances to combustibles must be maintained.
These distances are shown in Chart 1.1 and on the minimum clearance to combustibles label
(F/N: LLPCL002) found 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 infra-red 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 infra-red surface, or
reflector, and the combustible item. Considerations must also be made for moving objects around the
infra-red 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 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 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.

5
1.0 Safety •Clearance to Combustibles
Chart 1.1 • Clearance to Combustibles in Inches (see Figure 1.1)
* Heaters mounted on an angle between 0° to 30° must maintain clearances posted for 0° or 30°;
whichever is greater.
Certain applications (awnings, fabrics, plastics, sprinklers, insulation) may require the heater to be
mounted at a distance in excess of the published clearances to combustibles. Contact the factory.
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.
Back
This side down
Below
Top
(to ceiling)
Figure 1.1 •Clearance to Combustibles
Model No. Mounting
Angle* Sides Back Top Below End(s) Front
PH 28 (-SS)
28,000 [N,P]
0° 14 N/A 13 46 22 N/A
30° N/A 8 17 46 22 46
PH 31 (-SS)
31,000 [N,P]
0° 14 N/A 13 46 22 N/A
30° N/A 8 17 46 22 46
PH 34 (-SS)
34,000 [N,P]
0° 14 N/A 13 46 22 N/A
30° N/A 8 17 46 22 46
Below
SideSide
End End
Front
END VIEW
0° MOUNTING ANGLE
END VIEW
30° MOUNTING ANGLE
SIDE VIEW
30˚
Top
(to ceiling)

6
1.0 Safety •Gas Connection •Standards, Certifications and Government Regulations
Standards, Certifications and Government Regulations
Installation of this infra-red 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 the National Fuel Gas
Code, ANSI Z223.1 (NFPA 54).
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 or in direct contact
with infrared rays. In no case shall the gas supply support or bear weight of the heater.
Gas Connection
Chart 1.2 • Standards and Code Installation Guidelines •Building Aspect
Building
Aspect Codes And Guidelines
Electrical The heater must be electrically grounded in accordance with the following codes:
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.
Venting Unvented heater must meet ventilation requirements. See page 17.
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.
Potentially flammable substances, such as Propylene Glycol or antifreeze solutions, are not to be used in
conjunction with this heater.
For further information consult NFPA 13. Always observe applicable state and local codes.

7
Detroit Radiant Products Units comply or are certified by one or more of the following
organizations or standards:
• CSA International Requirement (CSA 2.37/5.90 U.S.).
• American National Standards Institute (ANSI Z83.26).
1.0 Safety •Standards, Certifications and Government Regulations
Chart 1.3 • Standards and Code Installation Guidelines •Building Type
Building
Type Codes And Guidelines
Public
Garages
Installation of this infra-red heater in public garages must conform to the following codes:
Standard for Parking Structures NFPA 88A (latest edition)
or the Standard for Repair Garages NFPA 88B (latest edition).
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.
Aircraft
Hangars
Installation of this infra-red heater in aircraft hangars must be in accordance with the
following codes:
Refer to Standard for Aircraft Hangars, ANSI/NFPA 409 (latest edition).
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 infra-red heaters for
recurrent maintenance purposes.

!
CLEARANCE TO COMBUSTIBLES
FIRE HAZARD. Always maintain published clearance to combustibles.
In locations used for the storage of combustible materials, signs must be
posted. Consult manual for additional guidelines.
MODEL NO.
DANGER
SIDE(S) BELOW TOP BEHINDEND(S) FRONT
ALL MODELS
(in millimeters)
MOUNTING
ANGLE
0°
0°
30°
30°
22”
559mm
22”
559mm
14”
356mm
N/A
N/A
46”
1168mm
46”
1168mm
13”
330mm
17”
432mm
N/A
N/A
8”
203mm
N/A
N/A
46”
1168mm
ALL MODELS
(in inches)
Contact may cause burn.
Do NOT touch hot surface.
Allow to cool before
servicing.
This heater must be installed
by qualified personnel only
and in accordance with the
latest edition of the
ANSI/NFPA Standards.
(ANSI/NFPA 88A Parking Structures), 88B
(Repair Garages), 409 (Aircraft Hangars).
Observe all country, state and local codes.
LIGHTING INSTRUCTIONS
1. Rotate heater’s valve knob to “ON” position.
2. Close electrical circuit (usually thermostat).
3. If the heater fails to light, turn “OFF” gas, open electrical circuit and wait 5 minutes
before repeating.
Avoid Serious Injury or
Death. Improper installation,
adjustment, alteration, service
or maintenance can cause
property damage, injury or
death. Read the installation, operation and
maintenance manual thoroughly before
installing or servicing this equipment.
This is not an explosion-proof heater. Where
there is the possibility of flammable vapors or
dusts, consult the local fire marshal, fire
insurance carrier or other authorities for
approval of the proposed installation. Always
maintain minimum ventilation requirements.
30°
This side down
END VIEWSIDE VIEW 0° Mounting END VIEW
30° Mounting
The minimum end clearance is 22” or 559mm.
!
CLEARANCE TO COMBUSTIBLES
FIRE HAZARD. Always maintain published clearance to combustibles.
In locations used for the storage of combustible materials, signs must be
posted. Consult manual for additional guidelines.
MODEL NO.
DANGER
SIDE(S) BELOW TOP BEHINDEND(S) FRONT
ALL MODELS
(in millimeters)
MOUNTING
ANGLE
0°
0°
30°
30°
22”
559mm
22”
559mm
14”
356mm
N/A
N/A
46”
1168mm
46”
1168mm
13”
330mm
17”
432mm
N/A
N/A
8”
203mm
N/A
N/A
46”
1168mm
ALL MODELS
(in inches)
Contact may cause burn.
Do NOT touch hot surface.
Allow to cool before
servicing.
This heater mustbe installed
by qualified personnel only
and in accordancewith the
latest editionof the
ANSI/NFPAStandards.
(ANSI/NFPA 88A ParkingStructures), 88B
(Repair Garages),409 (Aircraft Hangars).
Observe all country, state and localcodes.
LIGHTING INSTRUCTIONS
1. Rotate heater’s valve knob to “ON” position.
2. Close electrical circuit (usually thermostat).
3. If the heater fails to light, turn “OFF” gas, open electrical circuit and wait 5 minutes
before repeating.
AvoidSerious Injuryor
Death. Improper installation,
adjustment, alteration, service
or maintenance can cause
propertydamage, injuryor
death. Read the installation,operation and
maintenance manualthoroughly before
installing or servicingthis equipment.
This is notan explosion-proof heater. Where
there isthe possibilityof flammable vaporsor
dusts,consult the localfire marshal, fire
insurance carrier orother authoritiesfor
approvalof the proposedinstallation. Always
maintainminimum ventilation requirements.
30°
This side down
ENDVIEWSIDEVIEW 0°Mounting ENDVIEW
30°Mounting
Theminimum end clearanceis 22” or 559mm.
Maintain Clearances to Combustibles to Prevent the Risk of Fire.
Clearances to combustibles must be maintained in order to prevent
the ignition of combustible materials. 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. Clearances are provided on
the heater’s safety labels and in the heater’s Installation & Operation
Manual. Refer to applicable ANSI orNFPA-54 Standards or local codes
for further information. Post this tag adjacent to the heater’s
thermostat or controls before operating the heater.
WARNING
AVOID SERIOUS INJURY, DEATH OR PROPERTY DAMAGE.
!
INSTALLER. READ AND POST THIS NOTICE.
F/N: LL01 - Clearance Safety Tag
(Affix adjacent to heater’s thermostat).
F/N: LL02 - Observe Proper Gas Type (Natural Gas)
F/N: LL03 - Observe Proper Gas Type (LP Gas)
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 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 heaters thermostat or in
absence of such thermostats in a conspicuous location.
Safety warning labels must be maintained on the infra-red 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 thermostats or in the
absence of such thermostats in a prominent location.
8
1.0 Safety •Safety Signs and Labels
Top Panel
F/N: LLPCL002
Patio Heater Clearance
to Combustibles Label
WARNING OBSERVE
PROPER GAS
DO NOT
ROTATE CONTROL
ASSEMBLY FOR
GAS TYPE
ONLY
USE TWO
WRENCHES
TO TIGHTEN

2.0 Installation
WARNING
!
CAUTION
!
NOTICE
To ensure a safe, properly designed heating system, a layout should be developed for the correct
placement of the infra-red heater(s). Aside from safety factors such as clearance to combustibles
(see Chart 1.1 on page 5), you should take into consideration:
• The environment (e.g., is it cold/drafty, average, protected)?
Note: The effective infra-red surface temperature of a person or object may be diminished
with wind above 5 mph, wind barriers may be required.
• What is the area of heat coverage (e.g., sq. ft.) needed (Chart 2.1, Figure 2.2)?
• Is the heater being used in a social gathering area, or work station(s)?
• The mounting height of the heater (Chart 2.1, Figure 2.2).
• The type of mounting to be used.
• Physical space needed for the heater (Figure 2.1).
• Gas supply and connections.
• Combustion, ventilating air supply and exhaust path.
• Electricity and wiring to the heater.
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.
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.
This heater cannot be used in a building with a roof that is not insulated or where condensation problems
can occur.
Design
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.

10
2.0 Installation •Design
Chart 2.1 • Recommended Mounting Heights
Model & Input
Recommended
Mounting Height
(Dim. A)
Approximate
Coverage Area
Approx. Coverage
(sq. ft.)
PH-28
28,000
BTU/H
8’-0” to 8’-6” 7’ x 7’ 49 sq. ft.
PH-31
31,000
BTU/H
8’-0” to 9’-0” 8’ x 8’ 64 sq. ft.
PH-34
34,000
BTU/H
8’-6” to 10’-0” 9’ x 9’ 81 sq. ft.
A
Figure 2.2 •Recommended Mounting Heights
Note: This chart is provided as a guideline. Actual conditions dictate variances from this data.
Figure 2.1 •Heater Dimensions
END VIEW
8.5”
9”
SIDE VIEW
42.25”

10 11
2.0 Installation •Heater Mounting
WARNING
!
Heater Mounting
Improper suspension of the infra-red 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.
The heater can be suspended with chains or rigid threaded rod. Local codes, or conditions such as wind
drafts or other variables can cause movement of the heater and may require rigid threaded rod. Avoid
excessive movement and/or vibration of the gas connection by rigidly mounting the heater (see Figure 2.4).
The Detroit Radiant optional patio heater mounting brackets (P/N: PH-BKT) can be used in place of rigid
threaded rods. Consult all applicable codes before installation.
The heater must be level from side to side and can be set at an angle between 0° and 30° from horizontal.
The gas connection and power cord must be located on the lower side (see Figure 2.3).
Level end to end
The gas connection
and power cord must
be located towards the
lower side of the heater
(towards the floor).
Optional mounting
bracket (P/N: PH-BKT)
30° End
Figure 2.3 •Heater Orientation
End

Figure 2.4 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 and close S-Hook (P/N: S-HOOK) and #1 double-loop chain (P/N: THCS includes a 5 ft. chain
and 2 S-hooks, 4 required) to anchor. Check that it is securely attached.
4Attach heater to chains. Adjust chain lengths until the heater is level and equal weight distribution is
achieved. Chains must be straight up and down, do not install chains at an angle.
12
2.0 Installation •Heater Mounting
Steel C-clamp
Screw Hook
S-Hook and
#1 double-loop
chain (recommended)
Bar Joist Clip
Rigid threaded rod
and turnbuckle
(field supplied)
Optional mounting
bracket (PH-BKT)
attached to ceiling.
Wood Beam
Optional mounting
bracket (PH-BKT)
attached to wall.
I-Beam
Figure 2.4 •Heater Mounting
Concrete Beam
0-30° 0-30° 0-30°
0-30°
0-30°
0° Mounting Angle
30° Mounting Angle
30° Mounting Angle0° Mounting Angle

2.0 Installation • Gas Supply
13
Gas Supply
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.
Chart 2.2 • Manifold Pressure
Type of Required Manifold Minimum Inlet Maximum Inlet
Gas Pressure Pressure Pressure
Pressure Equivalents: 1 in. W.C.P. equals .058 oz./sq. in. equals 2.49 Mbar.
Note: Check manifold pressure at the tap on the ball shutoff valve. Readings will be above atmospheric
pressure during operation.
The gas supply to the infra-red heater must be connected and tested in accordance with national, state,
provincial and local codes along with the guidelines in the Detroit Radiant PH Series manual. Refer to the
latest edition of the ANSI Z223.1 (NFPA 54) Standard.
Important! Before connecting the gas supply to the infra-red heater(s):
• Check for conditions such as drafts or other variables which might cause excessive movement of
the unit and cause damage to the gas connection. Ensure that the unit is securely mounted
and connect the gas with an approved connection device suitable for the environment of use.
• 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 2.2). 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).
• For test pressures in excess of 1/2 psig (3.5 kPa), the heater and ball shutoff valve must be
disconnected from the gas supply piping system during any pressure testing of the system.
• For test pressures equal to or less than 1/2 psig (3.5 kPa), the heater must be isolated from the gas
supply piping system by closing it’s individual manual shutoff valve during any pressure testing of
the gas supply piping system.
Natural 5.0 in. W.C.P. 6.0 in. W.C.P. 14.0 in. W.C.P.
Liquefied Petroleum 10.0 in. W.C.P. 11.0 in. W.C.P. 14.0 in. W.C.P.

14
2.0 Installation •Gas Supply
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 hose and fittings for abrasion, wear or damage. Replace if necessary.
To disconnect the gas:
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).
2A stainless steel flexible hose (field supplied) formed into a smooth C-shape is recommended. If
local codes prohibit the use of a gas hose, then a swing joint may be used.
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 gas connector (field supplied) to the adapter and the heater’s gas inlet. Seal the joints.
Important! The fittings (nuts) on the flexible connector (field supplied) must be connected to an
adapter. They may not be directly connected to the gas supply pipe.
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.
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).
To connect the gas:

15
2.0 Installation •Gas Supply
WARNING
!
!
Failure to disconnect the electricity to the heater before disconnecting the gas supply
may result in explosion, fire, property damage, injury or death.
Figure 2.5 •Gas Connection (shown installed with a flexible hose)
Drip leg / Sediment trap
(field supplied)
Stainless steel gas connector
(field supplied), formed into
smooth C-shape.
Regulator
(field supplied
when required)
Elbows
(field supplied)
Shut off valve
(field supplied)
Optional
mounting
bracket
(P/N: PH-BKT)
Shut off valve / inlet tap
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.

2.0 Installation •Electrical Requirements
NOTICE
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.
Control systems are initiated by either 120V or optional 24V control voltage. A 120V system can be
operated directly with 120V to the heater. Heaters with the optional relay can be controlled with 24V.
Transformers (sold separately) must be used to supply power of sufficient VA rating for single or multiple
connected installations.
Important! Proper grounding and polarity are essential. If the system is not properly grounded, it cannot
determine the presence of a flame and will lockout and shut off.
For wiring of controls see Figure 2.7 below. It is recommended that the control 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
(see Figures 3.1 & 3.2).
Electrical Requirements
Figure 2.7 •Typical Field Wiring
PH Series 120V PH Series 120V with 24V Control (PH-24VAO)
Radiant heat may damage the flexible power cord. Always keep the flexible power cord away from the
heater. Do not allow the power cord to be subjected to radiant heat.
16
Neutral Neutral -
24V thermostat,
timer or switch
(field supplied)
Hot
120V
Hot
24V
Transformer
+
PH Series
Heater
Optional
mounting
bracket
(P/N: PH-BKT)
120V thermostat,
timer or switch
(field supplied)
PH Series
Heater

2.0 Installation •Ventilation
17
16
This infra-red heater must be vented in accordance with national, state, provincial and local codes and
the guidelines in the Detroit Radiant PH Series 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 2.6).
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 4.0 CFM per 1000 BTU/H of gas
input. 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 1000 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.
Ventilation
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.
Figure 2.6 •Hot Flue Discharge
Discharge released from side
air channels. Keep area clear of
gas piping and electrical wiring.

18
When voltage is applied to L1 and L2, a circuit is completed from L1 via the blower motor to L2. The
blower fan is mounted in the control box and rated to supply sufficient air for combustion. Air pressure
generated by the blower will cause the normally open pressure switch to close. Another circuit is
completed from L1 to the spark ignition module and back to L2. After a seven (7) second pre-purge, the
spark electrode and gas valve are energized simultaneously. The trial for ignition is fifteen seconds.
Starting 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.
Running Circuit:
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 temperature 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 the hose assembly for excessive abrasion, wear or damage. If necessary replace.
The replacement hose must be that specified by Detroit Radiant Products.
• Check control compartment, burners and circulating air passages for debris. If necessary, clean
the debris.
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.
Sequence of Operation:

19
Wiring Diagrams
Figure 3.2 • PH Series 120V with 24V control
Figure 3.1 • PH Series 120V
Amp draw:
.10 starting
Amp draw:
.25 starting
.24 running
3.0 Operation •Wiring Diagrams
Lighting Instructions:
1 Rotate heater’s valve knob to “ON” position.
2Close electrical circuit (usually thermostat).
3If the heater fails to light, turn “OFF” gas, open electrical circuit and wait 5 minutes before
repeating.
Shutdown Instructions:
1 Open electrical circuit (usually thermostat).
2 Turn off electrical power if service is to be performed.
3Rotate heater’s valve knob to “OFF” position.

NOTICE
20
4.0 Maintenance
WARNING
!
4.0 Maintenance
Always wear clothing that protects the body and use protective glasses when
maintaining the heater.
Electrical shock or explosion may occur when conducting maintenance while
the heater is connected to the power source and gas supply. Disconnect
power and gas supply to heater before servicing.
Burner malfunction may result in explosion or fire. Never operate the heater if
there are any signs of malfunction, excessive wear or damage. Call a
professional for assistance.
Before each use:
• Check the gas supply line and hose assembly for any possible leaks or damage.
• Check heater elements for debris. Visually check burner flames.
• Keep the heated area clear and free of combustible materials, gasoline and flammable vapors and
liquids. Ensure there is no obstruction of the flow of combustion and ventilation.
Periodic maintenance:
• Clean the heater with cleaning agents suitable for the unit’s construction material (i.e., stainless
steel cleaner).
• Lubricate moving parts.
• Inspect the gas supply piping system for signs of corrosion or failure. Replace if necessary.
Before conducting maintenance on the heater disconnect the power and gas supply. When pressure
testing the gas supply piping system follow these guidelines:
• At a test pressure in excess of 1/2 psig (3.5 kPa) the heater and ball shutoff valve must
be disconnected from the gas supply piping system during any pressure testing of the system.
• At a test pressure equal to or less than 1/2 psig (3.5 kPa) the heater must be isolated from the
gas supply piping system by closing it’s individual manual shutoff valve during any pressure testing
of the gas supply piping system.
Cleaning the main burner:
1 Gently use an air hose to blow any accumulated dust and/or dirt off the heater. Air hose pressure
should 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.
3Gently place the air hose outlet into the venturi tube and allow the air to flow for approximately one minute.
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.
Cleaning the heater elements with high pressure air may cause damage to the elements and equipment
failure. Do not blow out heating elements with high pressure air.