Rinnai RHEPM8020N Owner's manual

2
HE+ Series Modulating Supplemental Manual
NOTICE:
This manual is current and correct for this product at time of manufacture. Occasional revision
of the product Certification Standard may require changes to the product and/or this manual.
This publication, or parts thereof, may not be reproduced in any form, without prior written con-
sent from Rinnai. Unauthorized use or distribution of this publication is strictly prohibited.
MODULATING — SUPPLEMENTARY MANUAL
A GENERAL INFORMATION MANUAL IS INCLUDED IN THE BURNER KIT
:
Do not store or use gasoline or other flammable vapours and liquids in the
vicinity of this or any other gas fired appliance.
:
◼ Extinguish any open flame
◼ Do not attempt to light this or any other appliance
◼ Don’t touch any electrical switch, or telephone
◼ Immediately 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

FIELD CONVERTIBILITY:
This appliance is field convertible to LP gas.
Only use a kit available from Rinnai.
Follow instructions provided in the kit and
all local and national codes.
Keep this manual in a secure place .
Record for future reference:
Model #:
Serial #:


     
       
      

-• -

3HE+ Series Modulating Supplemental Manual

..... 
 4
1. INPUT RATINGS AND DIMENSIONS 5
2. BURNER / TUBE KIT ASSEMBLY CHART 7
3. TURBULATOR LENGTH & LOCATION 8
4. COMBUSTION AIR DUCTING 11
5. FLUE VENTING: 12
MIN./MAX. SYSTEM LENGTHS 13
HEATER EXPANSION & VENT 14
VERTICAL VENTING—CATEGORY I 15
HORIZONTAL VENTING—CATEGORY III 16
6. GAS SUPPLY PRESSURES 18
7. ELECTRICAL AND THERMOSTAT 18
8A. WIRING DIAGRAM: FENWAL DSI
24V or 120V THERMOSTAT 19
……...
9. FENWAL DSI: SEQUENCE OF OPERATION 21
SPARK IGNITER SET UP 23
FENWAL DSI SERVICE CHECK 23
10. TROUBLESHOOTING GUIDE: DSI 24
11. TROUBLESHOOTING GUIDE: HEATER 25
12. START– UP / COMMISSIONING SHEET 27
13. GAS CONVERSION OF BURNER 29
14. HIGH ALTITUDE & ORIFICE CHART 30
15. BURNER PARTS LIST 31
16. TUBE SYSTEM PARTS LIST 33

• ALSO REFER TO THE GENERAL MANUAL INCLUDED FOR THIS SERIES HEATER

 ....... 
IMPORTANT INFORMATION - READ FIRST
 4
 5, 31
 5, 31
 5, 26
‘’5
 5
‘’6
 6
Clearances Figure & Table 7
 8
1. LABOR REQUIREMENTS 9
2. INSTALLATION IN AIRCRAFT HANGARS 9
3. COMMERCIAL GARAGES 9
4. USE OTHER THAN SPACE HEATING 9
5. PRE-INSTALLATION SURVEY 10
6. MOUNTING CLEARANCES 11
SERVICE CLEARANCE 11
HEATER PLACEMENT GUIDELINES 12
……...
7. SYSTEMS WITH 90° & 180° ELBOWS 12
ELBOW KIT DIMENSIONS 13
8. SUSPENSION OF THE SYSTEM 14
9. BURNER & TUBE INSTALLATION:
STRAIGHT TUBE SYSTEM 15
SPECIAL COUPLING - 180 to 260 Mbh 18
10. SESMIC RESTRAINT 19
HIGH WIND RESTRAINT 19
11. REFLECTOR INSTALLATION 20
12. GAS SUPPLY 21
HEATER EXPANSION 22
FLEXIBLE GAS CONNECTION 23
13. ELECTRICAL AND THERMOSTAT 24
14. HIGH ALTITUDE INSTALLATION 24
15. LIGHTING INSTRUCTIONS 24
16. RECOMMENDED MAINTENANCE 24
17. OPTIONAL ACCESSORIES 25
OPTIONAL CONTROLS 27
WARRANTY STATEMENT BACK PAGE

4
HE+ Series Modulating Supplemental Manual

HE+ Series models are modulating gas-fired radiant tube heatersthat may be installed for
heating of commercial / industrial indoor spaces.Not for use in residential dwellings.
A “residential dwelling” is defined in the standard as “a housekeeping unit used or intended to
be used as a domicile by one or more persons, containing cooking, eating, living, sleeping,
and/or sanitary facilities. A residential dwelling does not include an attached garage, detached
garage, workshop or outdoors”. Local Code requirements take precedence for this application.
It is beyond the scope of these instructions to consider all conditions and requirements that
may be encountered in the field. Installation must conform with all local codes or, in the ab-
sence of local codes, with the latest edition of the National Fuel Gas Code, ANSI Z223.1/NFPA
54 in the U.S.A. The latest edition Electrical Code ANSI/NFPA No. 70 in the U.S.A. must also
be observed.
Installation of a gas fired tube heater must conform to all heating installation design procedures
including clearance to combustibles, connection to the gas and electrical supplies, and ventila-
tion requirements.
This heater is not for installation in a Class 1 or Class 2 explosive environment, nor in a resi-
dential dwelling. If installation of this equipment is in question, consult with the local authority
having jurisdiction (Fire Marshall, labor department, insurance underwriter, or other).
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.
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 could result in personal injury, death, fire and/or property dam-
age.
Do not store or use gasoline or other flammable vapours and liquids in the vicinity
of this or any other gas fired appliance.
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.

California Proposition 65:
: 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

5HE+ Series Modulating Supplemental Manual











  

RHEPM8020N
RHEPM8030N NG / PROPANE 80,000 / 60,000
20 21’ 7” 111
30 31' 3" 154
RHEPM11530N
RHEPM11540N NG / PROPANE 115,000 / 72,000
30 31' 3" 154
40 40’ 11” 197
RHEPM15540N
RHEPM15550N NG / PROPANE 155,000 / 100,000
40 40’ 11” 197
50 50’ 7” 239
RHEPM20550N
RHEPM20560N NG / PROPANE 205,000 / 125,000
50 50’ 7” 239
60 60' 3" 282
RHEPM25060N
RHEPM25070N NG / PROPANE 250,000 / 160,000
60 60' 3" 282
70 69’ 11” 324
 - 
205,000 or less:
903000013 - 1/2”x24”
225,000 or more:
903000061- 3/4”x36”
FLEXIBLE GAS CONNECTOR (Included in Burner Kit) - MUST INSTALL - see GENERAL MANUAL Section 15
See next page for dimensions of heater components (Burner, tube, reflector, turn box)
**Additional tube length is available upon request

6
HE+ Series Modulating Supplemental Manual
Tube
Length ‘’ = center air intake to end
10’ 11’-3 3/4” ; 135 3/4” ; 345 cm
20’ 20’-11 3/4” ; 251 3/4” ; 628 cm
30’ 30’-7 3/4” ; 367 3/4” ; 934 cm
40’ 40’-3 3/4” ; 483 3/4” ; 1229 cm
Tube
Length ‘’ = center air intake to end
50’ 49’-11 3/4” ; 599 3/4” ; 1523 cm
60’ 59’-7 3/4” ; 715 3/4” ; 1818 cm
70’ 69’-3 3/4” ; 831 3/4” ; 2113 cm
80’ 78’-11 3/4” ; 947 3/4” ; 2407 cm
-
• POSITION BURNER END HANGER 4 INCHES (10 CM) FROM BURNER CONNECTION
• LOCATE SYSTEM HANGERS NO LESS THAN 6 INCHES (150mm) AND NO MORE THAN 24
INCHES (610mm) FROM TUBE COUPLING

REFLECTOR = 120”

7HE+ Series Modulating Supplemental Manual


INPUT
[BTUH]
TUBE
LENGTH
BASE SYSTEM TUBE KIT(S) FIRST TUBE SECOND TUBE
PRIMARY KIT SECONDARY KIT
80,000 20' RHEPP2AHM N/A Aluminized Steel Hot Rolled Steel
80,000 30' RHEPP3AHM N/A Aluminized Steel Hot Rolled Steel
115,000 30' RHEPP3AHMX N/A Aluminized Steel Hot Rolled Steel
115,000 40' RHEPP4AHMX N/A Aluminized Steel Hot Rolled Steel
155,000 40' RHEPP4AHMX N/A Aluminized Steel Hot Rolled Steel
155,000 50' RHEPP3AHMX RHEPS2HHS1S2 Aluminized Steel Hot Rolled Steel
205,000 50' RHEPP3AH RHEPS2HHS1S2 Aluminized Steel Hot Rolled Steel
205,000 60' RHEPP3AH RHEPS3HHS1S2 Aluminized Steel Hot Rolled Steel
250,000 60' RHEPP4SS RHEPS2HHS1S2 Stainless Steel Stainless Steel
250,000 70' RHEPP4SS RHEPS3HHS1S2 Stainless Steel Stainless Steel
TUBE KIT NOMENCLATURE
Example: ------
Rinnai
 Series: High Efficiency Plus/Comfort
Type:
• P = Primary
• S = Secondary
Tube Quantity (1-4)
First Tube Material:
• A = Aluminum
• H = Hot Rolled Steel
• S = Stainless Steel
Second Tube Material:
• A = Aluminum
• H = Hot Rolled Steel
• S = Stainless Steel
 Stage
• M = Modulating
• MX = Modulating Alternate Turbulator
• 1S2S = 1 and 2 Stage

8
HE+ Series Modulating Supplemental Manual






30 ft PRIMARY: RHEPP3AHMX
RHEPS2HHS1S2 20 ft SECONDARY

20 ft SECONDARY
RHEPS3HHS1S2 30 ft SECONDARY


20 ft SECONDARY
40 ft PRIMARY: 
RHEPS3HHS1S2 30 ft SECONDARY

9HE+ Series Modulating Supplemental Manual



10
HE+ Series Modulating Supplemental Manual

Improper location of a turbulator can cause malfunction of the heater, property
damage, and will void the heater warranty.
Tubes with turbulators inside are clearly labeled for easy identification.
ALL turbulators are located within the BASE LENGTH (shortest length) of the tube sys-
tem. One or two tubes added to system base length are regular empty tubes with no turbulators.
Each turbulator is 36 inches in length by 2.25” wide (see Table below).
Turbulators link together with tabs, and individual sections can be removed by straightening tabs (see
below). A Base Tube Kit may need turbulator removal depending on input rate (see below and illustra-
tion next page).
The orientation of the turbulator(s) [up - down; sideways] in the tube does not matter.














NG or LP 80,000 x 20 [4] x 2.25” x 36” 1 IN 1st TUBE + 3 IN 2nd TUBE No action required
NG or LP 115,000 x 30 [3] x 2.25” x 36” 1 IN 2nd TUBE + 2 IN 3rd TUBE No action required
NG or LP 155,000 x 40 [3] x 2.25” x 36” 1 IN 3rd TUBE + 2 IN 4th TUBE No action required
NG or LP 205,000 x 50 [2] x 2.25” x 36” 2 IN 5th TUBE Remove 1 turbulator from 5th tube
NG or LP 250,000 x 60 [1] x 2.25” x 36” 1 IN 6th TUBE No action required


1.Carefully pull out the turbulator sec-
tion to be removed from the swaged
end of the tube. The end of the turbula-
tor to be left inside the tube should not
extend beyond the swaged portion of
the tube. Rotate the tube to have ac-
cess to the locking tab
3. Lift up the end of the
turbulator that is left
inside the tube to disen-
gage the tab that was
bent in the vertical posi-
tion
2. Bend and push the
outer tab with pliers until
it is in the vertical posi-
tion
4. While still holding the
inner turbulator in its loca-
tion, pull the outer turbulator
to completely disengage
and discard
: 205,000 BTUH Model