Rinnai RSEP1S25P User manual

2
SE+ Series Infrared Gas Heater Installation and Operation Manual
NOTICE:
Rinnai reserves the right to make changes to equipment and specifications without obligation
or notification. This publication, or parts thereof, may not be reproduced in any form, without
prior written consent from Rinnai. Unauthorized use or distribution of this publication is strictly
prohibited.
Improper installation, adjustment, alteration, service or mainte-
nance can cause property damage, injury or death.
Read the installation and operating and maintenance instructions
thoroughly before installing or servicing this equipment.
SAFETY ALERT:
This heater must be installed and serviced only by a trained gas service technician. Failure to
comply could result in personal injury, death, fire and/or property damage.
Do not store or use gasoline or other flammable vapors and liquids in the
vicinity of this or any other gas fired appliance.
Indoor Applications: The heater cannot be used indoors in a residence.
IF YOU SMELL GAS:
◼ Extinguish any open flame
◼ Do not attempt to light this or any other appliance
◼ Don’t touch any electrical switch, or telephone
◼ Immediately leave the area and call your gas supplier from a neighbor’s phone
◼ Follow any and all instruction from your gas supplier
◼ If your gas supplier is not available, call the fire department
WARNING
FIELD CONVERTIBILITY:
This appliance is field convertible to
LP gas (except RSEP2S50N: NG only).
Only use kit available from Rinnai.
Follow kit instructions and all local and
national codes.
INSTALLER: PRESENT THIS MANUAL
TO THE END USER.
Keep this manual in a secure place.
Record for future reference:
Model #:
Serial #:
(located on heater rating label)
All models approved:
 ANSI Z83.26-2014 / CSA 2.37-2014
 Gas-Fired Infrared Patio Heater for Outdoor Commercial / Residential Application
 ANSI Z83.19a-2011 / CSA 2.35a-2011
 Gas-Fired High Intensity Infrared Heater for Commercial /Industrial Non-Residential
Application for either indoor or outdoor installation
All models constructed with Marine Grade Stainless Steel Cabinet

3SE+ Series Infrared Gas Heater Installation and Operation Manual
TABLE OF CONTENTS
TOPIC PAGE NUMBER
IMPORTANT INFORMATION - READ FIRST
IMPORTANT WARNINGS...........................4
HEATER EXPANSION ................................5
GAS CONNECTION....................................5
VENTING ..............................................5, 13
‘SMOKE’ & DISCOLORATION ...................5
MOUNTING & CLEARANCE DISTANCES:
OUTDOOR PATIO INSTALLATION .......6
INDOOR INSTALLATION ......................9
1. APPLICATION ................................................ 11
OUTDOOR / PATIO.................................... 11
INDOOR INSTALLATION ........................... 11
2. AIRCRAFT HANGARS.................................... 12
3. GARAGES & PARKING STRUCTURES .......... 12
4. OTHER THAN SPACE HEATING.................... 12
5. PRE-INSTALLATION SURVEY ....................... 12
6. INSTALLATION REQUIREMENTS.................. 13
6.1 MOUNTING CLEARANCES .....................13
6.2 HEATER MOUNTING............................... 13
7. GAS SUPPLY PIPING..................................... 14
7.1 GAS PRESSURE ..................................... 14
Gas-fired Infrared Patio Heater for Outdoor Commercial / Residential Application,
and Gas-Fired Luminous (High Intensity) Infrared Heater for Commercial / Industrial
Non-Residential Application for either indoor or outdoor installation
TOPIC PAGE NUMBER
8. ELECTRICAL - BASIC REQUIREMENTS ......... 14
9. INSTALLATION PROCEDURES....................... 15
10. LIGHTING INSTRUCTIONS............................. 16
10.1 SHUT DOWN INSTRUCTIONS ............... 16
11. HEATER FINISH & APPEARANCE .................. 16
12. SERVICING GUIDE......................................... 17
13. VENTILATION FOR INDOOR APP’S ............... 19
14. DIMENSIONS & CONFIGURATION................. 20
15. MOUNTING KIT OPTIONS.............................. 21
16. ELECTRICAL REQUIREMENTS...................... 24
16.1 CONTROL OPTIONS............................... 24
17. SEQUENCE OF OPERATION-FENWAL 35-60
DSI.................................................................. 25
18. SPARK IGNITION CIRCUIT ............................ 26
19. WIRING DIAGRAM.......................................... 27
20. TROUBLESHOOTING GUIDE ......................... 30
21. COMMISSIONING REPORT............................ 32
22. HIGH ALTITUDE INSTALLATION .................... 34
23. REPLACEMENT PARTS LIST.................. .35 - 36
IMPORTANT Installer: Present this manual to the end user. Acquaint the
end user with Important Information: Cover & pages 4 to 10.
END USER: In particular you must be aware of ‘Clearances to Combustible’ re-
quirements and the limitations of stacking or placing material near the heaters.
Inform your safety personnel and staff of this information.

4
SE+ Series Infrared Gas Heater Installation and Operation Manual
This heater is not for installation in a Class 1 or Class 2 explo-
sive environment, nor for any residential application. If installa-
tion of this equipment is in question, consult with local authorities having jurisdiction (Fire Mar-
shal, labor department, insurance underwriter, or others).
Revisions to codes and/or standards, may require revision to equipment and installation proce-
dures. In case of discrepancy, the latest codes, standards, and installation manual will take pri-
ority over prior releases.
IMPORTANT: DO NOT INSTALL THIS HEATER INDOORS IN A STRUCTURE WITH NO IN-
SULATION IN THE ROOF—CONDENSATION WILL OCCUR.
Improper installation, adjustment, alteration, service or maintenance can cause
property damage, injury or death. Read and understand this installation and op-
eration manual thoroughly prior to assembly, installation, operation or service to
this appliance.
This heater must be installed and serviced only by a trained gas service techni-
cian.
Do not store or use gasoline or other flammable vapours and liquids in the vicinity
of this or any other gas fired appliance.
Failure to comply to these warnings could result in personal injury, death, fire and/
or property damage.
This appliance may have sharp edges and corners. Wear protective clothing such
as gloves and protective eye wear when servicing this or any other appliance.
WARNING
Due to the effects of radiant heat upon certain materials it is not
recommended to store or place items that could be damaged or
distorted, directly under this heater....i.e. combustible patio furniture etc.
• Clothing or other flammable materials should not be hung from, or placed near to the heater
• Children and Adults should be alerted to the hazards of high surface temperatures and
should be careful to avoid burns or clothing ignition
• Young children should be carefully supervised when in the area of a heater
WARNING
WARNING
DO NOT INSTALL THIS APPLIANCE IN A RECESS, ALCOVE,
OR ENCLOSURE.
While minimum clearances to combustibles are stipulated to ensure safe installation, adequate
free space must be provided to allow the products of combustion to escape from the heater to
atmosphere when installed outdoors, or through mechanical exhaust withdrawal when installed
indoors. Also refer to “Outdoor” and “Indoor” definitions and requirements on page 11. Do not
allow the products of combustion to accumulate in any space or enclosure.
WARNING
California Proposition 65:
WARNING: This product can expose you to chemicals including carbon monoxide, which
is known to the State of California to cause birth defects or other reproductive harm. For more
information, go to www.P65Warnings.ca.gov

5SE+ Series Infrared Gas Heater Installation and Operation Manual
Heater Expansion
It is a normal condition that during heat-up and cool-down a radiant
heater will expand and contract. Allowances for heater expansion
must be made in the gas connection and heater suspension. Improp-
er installation, alteration, or adjustment can result in property dam-
age, injury or death.
WARNING
Venting
Inadequate venting of a heater may result in asphyxiation, carbon
monoxide poisoning, injury or death. When used indoors, this heater
is indirectly vented from the space. Venting must be in accordance
with all local, state, provincial, and national codes (ANSI Z223.1/
NFPA 54 in USA) and as indicated in this manual. Refer to Page 19
Gas Connection
Improper installation, connection, or adjustment can result in proper-
ty damage, toxic gases, asphyxiation, injury or death. Use an ap-
proved stainless steel flexible gas connector (field supplied) to con-
nect to the gas supply to the heater in accordance with all local,
state, provincial, and national codes (ANSI Z223.1/NFPA 54 in USA) and as indicated in this
manual.
WARNING
WARNING
WARNING Start-up ‘Smoke’ & Discoloration Condition
During start-up, the heating of material coatings used in the production process of the heater
may create a small amount of smoke during the initial period of operation. This condition is
normal and temporary .
Ensure that there is sufficient ventilation to adequately clear any ‘smoke’ from the space.
Notify site management and safety personnel to ensure that alarm systems are not unduly activated.
WARNING Heater Discoloration / Staining
Stainless Steel & Painted Finishes: Surface discoloration or staining will occur on any heater body
due to heat. Surface finish discoloration due to heat is a normal occurrence. Surface discoloration
does not affect the operation or performance of the heater nor Rinnai’s component warranties.
(Refer to Section 11: Heater Finish & Appearance, page 16)
Some discoloration can result from the deposit of ambient air-borne particulate or gases from within
the space that have passed through combustion to create ‘smoke’. The combustion of fuel gas in a
clean environment will not cause smoke discoloration deposits.

6
SE+ Series Infrared Gas Heater Installation and Operation Manual
WHEN INSTALLED AS AN OUTDOOR PATIO HEATER
• See pages 9 - 10 for Indoor installation, and Ventilation Requirements page 19
• Also refer to “Outdoor” and “Indoor” definitions and requirements on page 11
Certain materials or items, when stored under the heater, will
be subjected to radiant heat and could be seriously damaged.
Location of flammable or explosive objects, liquids or vapors close to the heater may cause
fire or explosion and result in property damage, injury or death. Do not use, store or locate
flammable or explosive objects, liquids or vapors in proximity of the heater.
The clearance to combustible material represents the minimum
distance that must be maintained between the outer heater surface
and a nearby surface. The stated clearance to combustibles repre-
sents a surface temperature of 117F° (65C°) above ambient tem-
perature when installed outdoors.
It is the installer’s responsibility to ensure that building materials
with a low heat tolerance which may degrade at lower tempera-
tures are protected to prevent degradation. Examples of low heat
tolerance materials include vinyl siding, fabrics, some plastics,
filmy materials, etc.
It is beyond the scope of these instructions to consider all conditions that may be encoun-
tered. Consult local authorities such as the Fire Marshall, insurance carrier, or safety authori-
ties if you are uncertain as to the safety or applicability of the proposed installation.
Refer to Table 1 & Figure 1 Next Page for the minimum mounting and clearances to
combustibles for Outdoor Patio application.
WARNING
DO NOT INSTALL THIS APPLIANCE IN A RECESS, ALCOVE,
OR ENCLOSURE.
Adequate free space must be provided to allow the products of combustion to escape from
the heater to atmosphere when installed outdoors, or to mechanical exhaust withdrawal
when installed indoors. Do not allow the products of combustion to accumulate in any space
or enclosure.
WARNING
Note: Do not store or place anything directly under heater
Ensure mounting height in any location is sufficient to prevent patrons from
coming in contact with heater, and clearance to combustibles is maintained.

7SE+ Series Infrared Gas Heater Installation and Operation Manual
Table 1: OUTDOOR - MINIMUM CLEARANCES TO COMBUSTIBLES
The clearance to combustible material represents the minimum distance that must be main-
tained between the outer heater surface and a nearby surface. In an OUTDOOR application
the stated clearance to combustibles represents a surface temperature of 90F° (50C°) above
ambient temperature.
It is the installer’s responsibility to ensure that building materials with a low heat tolerance
which may degrade at lower temperatures are protected to prevent degradation. Examples of
low heat tolerance materials include awnings, vinyl siding, fabrics, some plastics, filmy materi-
als, etc.
Figure 1: OUTDOOR - MINIMUM CLEARANCES (Indoor Clearances Page 10)
See Table 2 Next Page for “Suggested Mounting Height for Comfort”
NOTE: ANGLE MOUNT IS MAXIMUM 30° TO AVOID DAMAGE
Application MODEL NO
Horizontal 30° Angle Under Ends
ASTBFUE
OUTDOOR RSEP1S25X - NG/LPG 5.5” 7” 9.5” 1” 9.5” 48” 3”
OUTDOOR RSEP1S35X - NG/LPG 7.5” 9” 9.5” 1.5” 21” 48” 5”
OUTDOOR RSEP2S50N - NG Only 12” 28” 16” 10” 36” 60” 21”
Note: Do not mount less than 8 ft [2438 mm] above floor.
Do not store or place anything directly under heater
Ensure mounting height in any location is sufficient to prevent patrons from
coming in contact with heater, and clearance to combustibles is maintained.

8
SE+ Series Infrared Gas Heater Installation and Operation Manual
Table 2: SUGGESTED MOUNTING DISTANCES FOR COMFORT
*** Note: Mounting
angles and distances
are suggested to en-
sure comfort, and are
subject to site and
design conditions.
If in doubt, please
contact your Rinnai
distributor.
Ensure mounting
height in any location
is sufficient to prevent
patio patrons from
coming in contact
with the heater.
Figure 2: MOUNTING PARAMETER DISTANCES
SY
Z
H
A (Maximum 30°)
W
MOUNTING
PARAMETERS ***
MODEL
RSEP1S25X
23,000 Btuh
MODEL
RSEP1S35X
35,000 Btuh
MODEL
RSEP2S50N
50,000/35,000 Btuh
A - Mounting angle Horizontal Max. 300Horizontal Max. 300Horizontal Max. 300
H - Suggested height
above deck/floor 8’ to 10’ 8’ to 10’ 8’ 6” to 11’ 8’ 6” to 11’ 9’ to 12’ 9’ to 12’
S - Side distance to
patio edge 3’ 6” 3’ 6” 4’ 0” 4’ 0” 5’ 0” 5’ 0”
Y - Side distance
between heaters 6’ 0” 6’ 0” 8’ 0” 8’ 0” 9’ 0” 9’ 0”
W - Distance effective
coverage 6’ 0” 7’ 0” 7’ 0” 8’ 0” 8’ 6” 9’ 6”
Z - Front distance
between heaters 12’ 0” 14’ 0” 14’ 0” 16’ 0” 17’ 0” 19’ 0”

9SE+ Series Infrared Gas Heater Installation and Operation Manual
WHEN INSTALLED INDOORS FOR COMFORT OR SPACE HEAT
• Also refer to “Outdoor” definition and requirements on page 11
• And refer to Indoor Ventilation Requirements page 19
Clearance to Combustibles
Location of flammable or explosive objects, liquids or vapors close to the heater may cause fire
or explosion and result in property damage, injury or death. Do not use, store or locate flamma-
ble or explosive objects, liquids or vapors in proximity of the heater.
The clearance to combustible material represents the minimum dis-
tance that must be maintained between the outer heater surface and
a nearby surface. The stated clearance to combustibles represents a
surface temperature of 90F° (50C°) above room temperature.
It is the installer’s responsibility to ensure that building materials
with a low heat tolerance which may degrade at lower temperatures
are protected to prevent degradation. Examples of low heat toler-
ance materials include vinyl siding, fabrics, some plastics, filmy ma-
terials, etc.
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. Such signs must either be posted adjacent to the heater thermostats or in
the absence of such thermostats in a conspicuous location.
In addition to stored or stationary material, consideration must also be given to moveable ob-
jects such as cranes, vehicles, and overhead doors, and structural objects such as electrical
and gas lines, electrical fixtures, and sprinkler heads.
Heaters must be located an appropriate distance from sprinkler heads. This distance may be
greater than the certified clearance to combustibles. Check the temperature rating of the sprin-
kler heads and locate heaters at a safe distance - in some instances the sprinkler heads may
need to be replaced by higher temperature heads.
It is beyond the scope of these instructions to consider all conditions that may be encountered.
Consult local authorities such as the Fire Marshall, insurance carrier, or safety authorities if you
are uncertain as to the safety or applicability of the proposed installation.
Refer to Figure 3 and Table 3 NEXT PAGE for the mounting requirements and certified
clearances to combustibles for indoor installation. Also refer to ventilation requirements for
indoor installations on page 19.
WARNING
DO NOT INSTALL THIS APPLIANCE IN A RECESS, ALCOVE,
OR ENCLOSURE.
Adequate free space must be provided to allow the products
of combustion to escape from the heater to atmosphere when installed outdoors, or to me-
chanical exhaust withdrawal when installed indoors. Also refer to “Outdoor” and “Indoor” defi-
nitions and requirements on page 11.
Do not allow the products of combustion to accumulate in any space or enclosure.
WARNING

10
SE+ Series Infrared Gas Heater Installation and Operation Manual
Table 3: INDOOR - MINIMUM CLEARANCES TO COMBUSTIBLES
The clearance to combustible material represents the minimum distance that must be main-
tained between the outer heater surface and a nearby surface. The stated clearance to com-
bustibles represents a surface temperature of 90F° (50C°) above indoor room temperature.
It is the installer’s responsibility to ensure that building materials with a low heat tolerance
which may degrade at lower temperatures are protected to prevent degradation. Examples of
low heat tolerance materials include awnings, vinyl siding, fabrics, some plastics, filmy materials, etc.
Figure 3: INDOOR - MOUNTING CLEARANCES (Outdoor Clearances Page 7)
Table 4: INDOOR - SUGGESTED MOUNTING HEIGHT FOR COMFORT
MOUNTING
PARAMETERS ***
MODEL
RSEP1S25X
23,000 Btuh
MODEL
RSEP1S35X
35,000 Btuh
Mounting angle Horizontal MAX. 300Horizontal MAX. 300
Suggested height above deck/floor 9’ 0” 9’ 0” 10’ 0” 10’ 0”
NOTE: ANGLE MOUNT IS MAXIMUM 30° TO AVOID DAMAGE
Application MODEL NO
Horizontal 30° Angle Under Ends
ASTBFUE
INDOOR RSEP1S25X - NG/LPG 8” 10” 12.5” 2.5” 14” 60” 4”
INDOOR RSEP1S35X - NG/LPG 10.5” 14.5” 12.5” 2.5” 26” 60” 6”
INDOOR RSEP2S50N - NG Only 24” 33” 24” 24” 78” 78” 24”

11 SE+ Series Infrared Gas Heater Installation and Operation Manual
1. APPLICATION: All models are approved to ANSI Z83.26-2014 / CSA 2.37-2014 for heating of outdoor
commercial / industrial / residential patios and areas, and are also approved to ANSI Z83.19a-2011 / CSA
2.35a-2011 for heating indoor and outdoor commercial / industrial / non-residential spaces.
It is beyond the scope of these instructions to consider all conditions that may be encountered.
Installation in the USA must conform to all local and national code requirements including the
current National Fuel Gas code ANSI Z223.1, and the National Electrical Code ANSI/NFPA No
70 (latest edition). In case of discrepancy due to revisions to standards and codes, the latest
standards, codes, and installation manual are in effect and take priority.
DO NOT INSTALL THIS APPLIANCE IN A RECESS, ALCOVE, OR ENCLOSURE.
Adequate free space must be provided to allow the products of combustion to escape from the
heater to atmosphere when installed outdoors, or to mechanical exhaust withdrawal when in-
stalled indoors. Also refer to “Outdoor” and “Indoor” definitions and requirements below.
Do not allow the products of combustion to accumulate in any space or enclosure.
OUTDOOR / PATIO Installation:
This heater is certified for use outdoors. Rinnai warrants that the heater will operate as
designed for patio use in wind conditions up to 10 MPH . Higher wind speeds exceeding
10 MPH can adversely affect heater performance and human comfort conditions on the
patio.
What is “Outdoor”?:
An appliance approved for “outdoor use” may be installed with shelter no more inclusive than:
• With walls on all sides, but with no overhead cover, (overhead permanently open)
• Or Within a partial enclosure which includes an overhead cover and no more than two side
walls. These side walls may be parallel, as in a breezeway, or at right angle to each other.
The open sides must be permanently open
• Or Within a partial enclosure which includes an overhead cover and three side walls, as
long as 30 percent or more of the horizontal periphery of the enclosure is permanently open.
If an “outdoor” condition is not met, this heater is approved for “indoor use”. Ventilation
requirements of local codes apply. See “Indoor Installation” below.
INDOOR Installation:
This heater is certified for space or spot heating of commercial / industrial non-
residential indoor spaces in accordance with ANSI Z83.19 / CSA 2.35.
Inadequate venting of a heater may result in asphyxiation, car-
bon monoxide poisoning, injury or death. Heating system vent-
ing must be in accordance with all local, state, provincial, and national codes (ANSI
Z223.1/NFPA 54 in USA).
INDOOR INSTALLATION IN A STRUCTURE THAT HAS NO INSULATION IN THE ROOF
CAN RESULT IN THE FORMATION OF CONDENSATION ON COLD SURFACES.
WARNING

12
SE+ Series Infrared Gas Heater Installation and Operation Manual
2. INSTALLATION IN COMMERCIAL AIRCRAFT HANGARS
Luminous (high intensity) radiant tube heaters are suitable for use in aircraft hangars when in-
stalled in accordance with the latest edition of the Standard for Aircraft Hangars, ANSI/NFPA
No 409 in the USA.
A. A minimum clearance of 10 ft (3 m) above either the highest fuel storage compartment or
the highest engine enclosure of the highest aircraft which may occupy the hangar. The
clearance to the bottom of the heater shall be measured from the upper surface of either
the fuel storage compartment or the engine enclosure, whichever is higher from the floor.
B. A minimum clearance of 8 ft (2.4 m) must be maintained from the bottom of the heater to
the floor in other sections of the aircraft hangar, such as offices and shops, which communi-
cate with areas for servicing or storage. Refer to Table 1 for proper mounting clearances to
combustibles.
C. Heaters must be located so as to be protected from damage by aircraft and other objects,
such as cranes and movable scaffolding.
D. Heaters must be located so as to be accessible for servicing and adjustment.
3. INSTALLATION IN COMMERCIAL GARAGES AND PARKING STRUCTURES
Luminous (high intensity) radiant heaters are suitable for use in commercial garages when in-
stalled in accordance with the latest edition of the Standard for Parking Structures, ANSI/NFPA
88A, or the Standard for Repair Garages, ANSI/NFPA No. 88B.
An overhead heater shall be located to maintain the minimum
distance to combustibles, as shown on the heater rating plate,
from the heater to any vehicles parked below the heater.
Overhead heaters shall be installed at least 8 ft (2.4 m) above the floor.
4. INSTALLATIONS OTHER THAN SPACE HEATING
Use for process or other applications that are not space heating will void the C.S.A. certification
and product warranty. Process application requires field inspection and/or certification by local
authorities having jurisdiction. Process application design should be provided by local experi-
enced process design experts.
5. PRE INSTALLATION SURVEY
It is recommended that a full heating design including heat loss calculation be conducted on
the structure or area to be heated. Heater sizing and placement must consider available
mounting height, sources of greatest heat loss, and obstructions on the site. The certified clear-
ances to combustibles with respect to stored material, moveable objects (cranes, vehicles, lifts,
WARNING

13 SE+ Series Infrared Gas Heater Installation and Operation Manual
6. INSTALLATION REQUIREMENTS
6.1 MOUNTING CLEARANCES
The SE+ Series Heaters must be mounted with minimum clearances to combustible materi-
als. Refer to the introductory section “Clearance to Combustibles” pages 6 to 10 and to Table
1 and Figure 1 page 7 (Outdoor) or Table 3 and Figure 3 page 10 (Indoor).
THIS HEATER HAS HOT SURFACES: Minimum mounting height is to be no less than 87”
above the floor / deck. Do not locate heater where patrons can come into contact with heater.
Do not store or place items directly underneath heater. Maintain clearance to combustibles.
The heater must be located with respect to building construction and equipment so as to pro-
vide sufficient clearance and accessibility for servicing of burner and ignition control and
cleaning . Provide adequate clearance around air openings into the combustion chamber.
6.2 HEATER MOUNTING
This heater must be rigidly mounted to prevent movement from wind force.
Refer to Table 2 and Figure 2. The SE+ Series Heaters are approved for both horizontal and
30° angle mounting on the short axis. Rinnai specifies a MAXIMUM 30° mounting angle - if
the short axis is rotated to an angle exceeding 30°, damage to the heater or unsafe operation
can result, and will void warranty.
IMPORTANT: For either horizontal or up to 30° angle mounting, the long axis of the heater
must be level. Use only non-combustible mounting hardware. Figures 6 & 7 on Page 21 il-
lustrate typical suspension hardware that may be used, and provided by Rinnai as an optional
component.
overhead doors, etc), structural components, and sprinkler system heads. Consideration must
also be given to ventilation fan placement (outdoor heaters do not require ventilation). Care-
fully survey the area to be heated, and for best results place heaters in the coldest area(s)
and at sufficient spacing to provide uniform radiant heat coverage.
Installation must conform with all local, state, provincial and national code requirements in-
cluding the current latest edition ANSI Z223.1 (NFPA 54) in the U.S.A. The latest edition Elec-
trical Code ANSI/NFPA N0 70 in the U.S.A. must also be observed.
The heating system must have gas piping of the correct diameter, length, and arrangement to
provide for and satisfy the total system input. A layout drawing is necessary to calculate
properly sized gas supply piping.

14
SE+ Series Infrared Gas Heater Installation and Operation Manual
7. GAS SUPPLY PIPING
• All piping must be installed according to applicable local and national codes
• A listed flexible connector (field supplied) must be installed between the heater and gas
supply piping. For outdoor installation the connector must be in compliance with ANSI
Z21.75 / CSA 6.27. An optional 3/8” x 24” black finish flexible gas connector (part number
903000012 - approved Indoor/Outdoor) is available from Rinnai.
• A drip-pocket must be provided in the gas piping at the inlet connection
• Provide a 1/8” NPT plugged tapping, accessible for test gage connection, immediately up-
stream of the gas supply connection to the heater.
• On propane-fired units, a main line filter is recommended (field supplied)
• Piping joint compounds must be resistant to the action of liquefied petroleum gases
• All piping joints must be tested for leaks with a soap and water solution.
CAUTION: DO NOT INSTALL ANY GAS PIPING IN HEAT ZONES
The maximum supply pressure must be limited to 14”w.c. (0.5 psi). If the line pressure is
above 14”w.c., then a separate pressure reducing regulator must be installed. The minimum
pressure at the inlet to the heater regulator must be equal to or greater than 6.0”w.c. for natu-
ral gas and 11.0”w.c. for propane gas.
Proper manifold pressure must be established during commissioning, and will be maintained
when the main burner is operating under the following supply pressure:
7.1 GAS PRESSURE
Natural Gas: Orifice sized for 1000 BTU/CU.FT.
Propane Gas: Orifice sized for 2500 BTU/CU.FT.
8. BASIC ELECTRICAL REQUIREMENTS - see also Section 16 page 25
All electrical installations must meet local codes and the latest edition ANSI/NFPA N0 70 in the
U.S.A.
TRANSFORMER SPECIFICATIONS (field supplied)
Single heater requires 24 Volt, 60 Hz electrical transformer sized at 40 VA.
Multiple heaters in a zone are powered by a single transformer (field supplied). The proper
transformer is 24 Volt AC, 60 Hz, sized at 40VA for the first heater plus 20VA for each addition-
al heater in the zone - round up the calculated value to the next higher available sized trans-
former. For example, four heaters in a zone require a transformer of : 1 x 40VA + 3 x 20 VA =
100 VA . It is not recommended to install more than 12 heaters per zone.
Table 5 LINE PRESSURE ”w.c. MANIFOLD PRESSURE ”w.c.
MODELS GAS TYPE MINIMUM MAXIMUM AT GAS VALVE TEST PORT
NATURAL GAS 6.0 14.0 5.0
RSEP1S25X, RSEP1S35X PROPANE GAS 11.0 14.0 10.0
RSEP2S50N (2-Stage) NATURAL GAS (ONLY) 6.0 14.0 5.0 High; 3.0 Low

15 SE+ Series Infrared Gas Heater Installation and Operation Manual
a) Properly install gas line to all local codes
b) Mount heaters using non-combustible mounting hardware
c) Observe all minimum clearances as indicated: OUTDOOR in Table 1 and Figure 1, page
7; INDOOR in Table 3 and Figure 3, page 10.
d) Suggested mounting distances for comfort in Table 2 and Figure 2 are guidelines based
on experience. Site conditions can allow for some deviation from these distances.
WARNING: This heater must be rigidly mounted to prevent movement from wind force.
When using Mounting Brackets, ensure that anchoring to the structure is of suffi-
cient strength, integrity and workmanship, to support the weight of the heater and
any other loads such as snow and wind force.
e) Connect heater to the main gas line. An approved 1/2" flexible connector (field supplied -
available as an option from Rinnai) must be used to absorb heater and gas line expansion
and any vibration - check local code requirements.
f) Check gas line for leaks by using soap test or gas meter test. Ensure gas pressure meets
the requirements outlined in Section 7.1 (above).
WARNING: When testing the main gas line pressure up to 0.5 psig, ensure that the isolation
valve and combination gas valve are "OFF", otherwise damage to the combina-
tion gas valve will result. When testing main gas line in excess of 0.5 psig the
appliance and shut off valve must be disconnected or isolated from the gas sup-
ply piping system during any such pressure testing. Gas supply to the heater
must be regulated to be maximum 0.5 psig (14”w.c.) and minimum values listed
in Table 3 above in Section 7.1
g) All wiring must comply to local and national codes. The heater requires 24Vac power sup-
ply. The heater system zone requires a field supplied 120/24Vac transformer rated at
40VA for the first heater plus 20VA for each additional heater in the zone. Ensure proper
electrical rating in the system by checking voltage at ignition module terminals. To avoid
system malfunction, the voltage range must be within 10% of required 24Vac (21.6 Volts
to 26.4 Volts), and correct polarity must be maintained throughout the system.
h) Test-fire the heating system by following the lighting instructions listed below and on the
heater label.
9. INSTALLATION PROCEDURES
PROPER WIRING POLARITY MUST BE MAINTAINED, particularly when grouping the heat-
ers in a zone. Total wiring distances of up to 200' must use minimum 16 gauge electrical wire,
and wiring distances of over 200' must use minimum 14 gauge electrical wire. The heater
must be electrically grounded in accordance with local and national electrical codes. Malfunc-
tion of the heating system will result if the voltage varies by more than ±10% .
The heater can be controlled by a line voltage thermostat, a 24 volt thermostat or “off-on”
switch. Total load of all heaters must be considered in determining the required contact rating
of the controlling thermostat or switch.

16
SE+ Series Infrared Gas Heater Installation and Operation Manual
10.1 SHUT DOWN INSTRUCTIONS
a) For temporary shutdown, turn off the electrical supply circuit.
b) For complete shutdown, turn off the electrical circuit and turn gas control knob to the
"OFF" position.
10. LIGHTING INSTRUCTIONS
1. Ensure the correct voltage is supplied, gas supply lines have been properly purged, and
gas valve is switched to the ON position.
2. Turn on power to heater, set thermostat (if applicable) to above ambient temperature, the
heater will light.
3. If heater does not light: Turn off power to heater, turn gas valve to OFF position.
4. Wait for five minutes and repeat steps above. If heater does not light after three attempts,
call a qualified service technician.
11. HEATER FINISH AND APPEARANCE
All models are constructed with a marine grade stainless steel enclosure cabinet, with option-
al finish of stainless steel, or high temperature black coating.
Stainless Steel Enclosure Heater: ALL stainless steel heaters will discolor or stain to some
extent due to the impact of heat. This is a normal occurrence and does not effect heater per-
formance or the warranty of components.
High Temperature Coating Finish Heater: Exterior heater surfaces, including any stainless
steel components, are coated with a black high emissive coating that helps preserve the aes-
thetic appearance of the heater and improves the radiant heat output.
Handle the heater with care during installation and service to avoid scratching or damaging
the finish.
With extended use, the finish coat will discolor and deteriorate to some extent due to the im-
pact of heat, the deposit of ambient air born particles, and environmental factors.
These are normal occurrences caused by heat, products of combustion, and the environment,
and in no way affect the operation / performance of the heater or Rinnai’s warranty.
OCCASIONAL PAINT FINISH MAINTENANCE:
Wear protective gloves, eyewear, and breathing mask. Ensure that power to the heater is dis-
connected prior to maintenance and the application of any finish coating. Use a fine steel
wool to remove blemishes or unsightly deposit, and smooth the outer surface. The heater fin-
ish coat can be touched up using a high temperature coating such as Thurmalox Stove Paint -
Flat Black-1200°F (650°C) or similar high temperature stove paint that is compatible with the
original finish. No other coating or non-high-temperature paint finish may be applied to
the heater – use of an incompatible finish coating will create a hazardous condition
such as fire or noxious fumes, damage the heater, and void the warranty.
Apply the touch up finish with the heater in its operating orientation (facing down). Ensure that
overspray does not reach or effect the egg crate grilles and the burner tile surface - mask the
heater grilles during any re-finishing. Remove the masking immediately after re-finish and pri-
or to operation of the heater.

17 SE+ Series Infrared Gas Heater Installation and Operation Manual
Indication of back firing:
• Loud ignition noise, followed by distinct hissing sound.
• Little or no visible burning on the ceramic tile surface.
• Combustion is taking place inside the burner body.
WARNING: If heater backfires during operation, it must be turned off immediately.
Cause & remedy of back firing:
• Improper gas pressure entering the venturi tube: check pressure.
• Breakage of a ceramic tile and or gasketing: - replace damaged part.
• Faulty sealing of the ceramic tile to the burner body, caused by breakdown of gasket ma-
terial: contact your local distributor or contractor.
HEATER SERVICING POSITION:
WHEN USING WALL MOUNT BRACKET 903000024 (see Figure 4 next page), the heater
may need to be rotated ‘up’ so that access is provided to the service access door at the rear
side of the heater that is against the wall.
1. To allow rotation of the heater, slacken the upper bolt fastening the heater bracket to the
wall mounting bracket .
2. Remove the lower bolt securing the two brackets and rotate the heater up to the service
position.
3. Insert the bolt in the upper bracket hole to hold the heater for servicing, and apply locking
nut to bolt for extra safety. Heater panel can now be accessed and serviced safely.
4. NOTE: Do not start up the heater when in this upper service position as the gas
valve is in a compromised position. Before starting the heater, ALWAYS restore the
heater bracket back to its original plane and correct support position.
5. To restore the heater to the operating position, lift and support the weight of the heater and
remove nut and bolt from upper hole.
6. Slowly rotate the heater back down to the correct operating position.
7. Insert and fasten the bolt in the bottom hole, and secure with the nut.
8. At completion of service, ensure that both bracket support bolts are tightened securely.
Servicing of heater is essential for continued efficient operation. Servicing should be carried
out annually by a qualified gas service technician as follows:
• Clean the ceramic tiles with compressed air. Avoid directing air stream at gasket material
between tile and heater body. The air pressure must be lower than 20 psig.
• Clean venturi tube with compressed air. The air pressure must be lower than 20 psig.
• Ensure gas orifice is clean and the heater cabinet is free of any debris
12. SERVICING GUIDE (Also refer to Troubleshooting Guide on page 29)

18
SE+ Series Infrared Gas Heater Installation and Operation Manual
Figure 4: HEATER SERVICE POSITION WITH WALL MOUNT BRACKET
(To simplify illustration the heater is not shown)

19 SE+ Series Infrared Gas Heater Installation and Operation Manual
13. VENTILATION REQUIREMENTS FOR INDOOR APPLICATION
Inadequate venting of a heater may result in asphyxiation, car-
bon monoxide poisoning, injury or death. Heating system vent-
ing must be in accordance with all local, state, provincial, and national codes
(ANSI Z223.1/NFPA 54 in USA).
This heater is approved for unvented (indirect venting) application. Ensure that there is ade-
quate ventilation to supply combustion air and to dilute the products of combustion in accord-
ance with all local, state, provincial, and national codes. A balanced exhaust / inlet air system
is required to ensure that a negative air condition is not created. See below for a summary of
exhaust capacity requirements by the national codes in the U.S.A.
Air Supply: A “loose” building may not require any additional air supply if infiltration rates are
sufficient to offset exhaust volume. However, for “tighter” buildings, or if air movement is stag-
nant in an area, air can typically be supplied via inlet(s) with an area of 1 sq. in. per 1,000 Btuh
input (22 sq cm per kW). Locate air inlet(s) up at the level of the heaters to avoid cold drafts at
work level, and effectively supply combustion and dilution air to the heaters and balance the
system.
Heater Zoning: Exhausters are sized according to the input requirements of each controlled
zone of heaters. Multiple smaller zones are usually more effective in both comfort and ventila-
tion control than one large zone. Maximum zone size is limited by the total input that can be
handled by the capacity of an exhauster, and by the proximity of the exhauster to heaters in the
zone.
Exhauster Location & Proximity: Exhaust must be located as high as practicable in the
structure above the level of the heater(s) to effectively dilute and remove the warm (rising)
products of combustion. The exhauster should be as centrally located as practicable in the
zone of heaters. Rinnai recommends a maximum 6:1 ratio of the horizontal distance between
the exhauster and the furthest heater in a zone, to the height the heaters are mounted above
the floor . For example, if heaters are mounted 20 ft above the floor, then the exhaust fan
should be located no more than 120 ft from the furthest heater in the zone. Sufficient air supply
must be provided.
Exhauster Capacity:
USA: Natural or mechanical means shall be provided to supply and exhaust at least
4ft3/min/1000Btuh (0.38m3/min/kW) Natural Gas input of installed heaters [4.5ft3/
min/1000Btuh (0..43m3/min/kW) Propane input]. Some local codes may require an inter-
lock to a dedicated exhaust fan. Consult your local code and ANSI Z223.1 latest edition
for all venting requirements and practices.
WARNING

20
SE+ Series Infrared Gas Heater Installation and Operation Manual
MODEL Voltage
VAC
Current
amps
Btu/hr input Total
Weight (lbs).
Length
< A >
RSEP1S25X (NG and LP)
RSEP1S35X (NG and LP)
RSEP2S50N (NG) 24 40 VA*
23,000
23,000
35,000
35,000
50,000/35,000
32
32
44
44
49
30 1/2”
30 1/2”
43 1/2”
43 1/2”
48 1/4”
14. HEATER DIMENSIONS & CONFIGURATIONS
Figure 5: DIMENSIONS
Front View End View
Table 5: CAPACITIES & CONFIGURATIONS
* For a multiple heater installation, the first heater is sized at 40VA and each consecutive
heater is sized at 20VA. The sum total will be the required Transformer size. If total VA
exceeds one transformer size select the next higher VA rated transformer.
15. MOUNTING KIT OPTIONS (NOTE: For unusual mounting application contact
Rinnai.)
ITEM NO PART NUMBER DESCRIPTION
1903000009 CEILING MOUNT BRACKET
2903000022 WALL MOUNT BRACKET
3903000028 ARM MOUNT BRACKET
4903000026 POST BRACKET
Optional mounting kits available:
WARNING: This heater must be rigidly mounted to prevent movement from wind force.
Mounting Brackets: Ensure that anchoring to the structure is of sufficient
strength, integrity and workmanship, to adequately support the weight of the
heater and any other potential loads such as snow build up, and wind force.
A
10”
13”