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

11 HE+ Series Modulating Supplemental Manual
 


4” 5” 
4” 4” 5” 

Combustion air duct must be constructed of noncombustible material. ‘’ 
for air duct, the corrugated sides of this tubing will contract and restrict air flow. A good
quality industry approved hard-wall flex is allowed.
When a tube heater is operated in a negative air condition or air-born dust or contaminants are pre-
sent as in woodworking, and welding shops, air for combustion must be ducted from outside the
negative or contaminated area to the 4 inch (10 cm) diameter intake flange supplied on the blower.
Maximum system, vent and duct length is listed above.
• Do not exceed lengths listed above for total system and individual vent or air duct
• Total combined system length is reduced by five feet for every 90° elbow installed in the vent or
duct and in the tube system (see above for allowable total lengths)
• Exceeding the allowable lengths may create condensation or soot conditions and will void prod-
uct certification and warranty
The air intake will not be located less than:
• Three feet above grade
• Twelve inches from flue vent terminal of any heater with input up to 100,000 Btu/hr
• Three feet from flue vent terminal of any heater over 100,000 Btu/hr
An optional horizontal fresh air intake hood (908000021) is available to bring combustion air to the
heater from an outside wall. If dropping air duct down from the roof, use an approved rain cap for the
duct terminal. Ensure adequate clearance around the air intake to allow sufficient combustion air
supply to the heater. When drawing fresh air from outside, it is recom-
mended that any single wall pipe containing cold air be insulated to reduce
condensation on the pipe surface.
: When outside-air duct drops down from the roof:
• Drop air duct to a Tee / drip leg to the side of the burner
• This will potentially reduce condensate and other moisture
accumulation at the blower
 In locations where chlorinated Hydrocarbons are in use, such as Trichloroethylene or
Chloroethylene Nu it is essential that combustion air be brought in from a non-
contaminated area. Burning the fumes from these gases will create Hydrochloric acid
fumes, which are detrimental to humans, equipment and buildings. Typical sources of
other contaminants are paint removers, paints, refrigerants, solvents, adhesives, de-
greasers, lubricants, pesticides, etc.
The heater manufacturer cannot anticipate all types nor chemical composition of po-
tential contaminants at project sites. Prior to installation, confer with project site safety,
health and engineering staff and/or local authorities having jurisdiction such as the
Fire Marshall and Department of Labor for possible contaminants and any conflict with
the installation of hot surface heating equipment.

12
HE+ Series Modulating Supplemental Manual
 -
     

:
◼     : , this tube heater series op-
erates with a negative static vent pressure and a vent temperature that does not result in exces-
sive condensate in the vent and is defined as a Category I appliance. Refer to details below.
◼ : , this tube heater series oper-
ates with a positive static vent pressure and a vent temperature that does not result in excessive
condensate in the vent and is considered a Category III appliance. Refer to details below.
Inadequate venting of a heater may result in asphyxiation, carbon monoxide
poisoning, injury or death. This heater may use a vent connection or indirect
venting system to remove products of combustion from the space. Seal all
vent connections with high temperature sealant. Venting must be in accordance with all local, state,
provincial, and national codes (ANSI Z223.1/NFPA 54 in USA) and as indicated below in this manu-
al.



: Natural or mechanical means shall be provided to supply and exhaust at least 4ft/
min/1000Btuh (0.38m/min/kW) input of installed heaters. Some local codes may require an elec-
trical interlock to a dedicated exhaust fan. Exhaust must be located as high as practicable in the
structure above the level of the heater(s). Consult your local code and ANSI Z223.1 latest edition
for all venting requirements and practices.
-
It is the responsibility of the installer to adhere to these instructions and all current local codes and/or
ANSI Z223.1 (NFPA 54) latest editions for all venting requirements, and practices. All vent pipe will
be certified to meet Category I (vertical vent) or Category III (horizontal vent) appliance require-
ments, depending on the vent configuration of a particular installation.
It is a normal condition that during heat-up and cool-down a tube heater will expand and contract.
Allowances for heater expansion must be made in the venting and combustion air ducting. Improper
installation can result in property damage, injury or death.
◼ When vented: The system must not be operated in a negative air condition unless combustion
air is ducted from outside to the burner. If negative pressure is experienced or anticipated, the
open port (barb) on each of the blocked flue and proving air switches must be Tee’d together
and connected directly to outside air using a field supplied 1/4” plastic hose from the tee be-
tween the switches to outside of building.
◼ All approved vent pipe, connectors, and adapters are supplied locally by others according to
appliance Category, and specifications below
◼ Do not mix vent components from different manufacturers in the vent system
◼ All venting must meet requirements of Local Codes or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1/NFPA 54.
◼ A vent connector shall comply with local codes and be firmly attached to the flue collar by 3 x



13 HE+ Series Modulating Supplemental Manual
1/2” sheet metal screws
◼ Install a minimum 12” [305 mm] straight vent connector before any Tee or 90° Elbow
◼ The connection of vent components must be secured as specified in the installation instruc-
tions by the vent manufacturer.
◼ For vertical vent, any horizontal vent section will slope upwards away from the heater not less
than 1/4 inch rise per foot of run.
◼ For horizontal vent, slope downward away from heater a maximum of 1/4 inch down per foot of
run
◼ When the vent pipe passes through a cold or unheated area where the ambient temperature is
likely to produce condensation of the flue gases, the vent pipe will be insulated with a suitable
material as certified and specified by the insulation manufacturer to withstand temperature up
to 460°F (238°C).
◼ The vent system must be adequately supported to prevent sagging.
◼ The vent configuration will allow for expansion and contraction in length of the tube heater
◼ As an Option for vertical vent, two heaters may be vented through an approved common 4" x
4" x 6" Vent Tee (10 x 10 x 15 cm), supplied by the manufacturer, or by using approved com-
ponents as indicated in local codes. Vent pipe from each heater is not required to be equidis-
tant to the vent Tee, but must comply with local code requirements. A common thermostat or
“ON/OFF” switch must control the two commonly vented heaters. Common vent is not allowed
for Category III horizontal vent application.
:
◼     .
Lengths in the table apply to either Vertical or Horizontal vent.
◼ Tube Heater length + combustion air duct + vent +
elbows. Each 90° elbow in the system has an equivalent length of 5 ft.
◼ A maximum of 2 elbows is allowed in any portion (duct, tube heater, vent) with the exception of
up to three 90° elbows in a vertical vent run through the roof, for a total of maximum 6 (vertical
vent: 7) 90° elbows in the combined system
◼ Combustion air duct is not to exceed lengths in table below and may be 4” or 5” diameter for
inputs less than 200,000 Btuh, but must be 5” diameter for inputs 200,000 Btuh and greater
• 5” diameter duct requires a reducer to 4” diameter at the connection to blower inlet
◼ Exceeding the allowable lengths in the table below can create combustion and/or condensa-
tion issues and will void Certification and the heater warranty.
◼ Do not exceed the regardless of the allowed maximum
length of individual vent or combustion air duct

14
HE+ Series Modulating Supplemental Manual








(by Duct Diameter)


Individual: 4ӯ
OR
Combined: 6ӯ
With 4”
Air Duct
With 5”
Air Duct 4” Ø5” Ø
80,000   20 ft 30 ft 30 ft
115,000   20 ft 30 ft 30 ft
155,000   20 ft 30 ft 30 ft
205,000 Use 5”Ø  Use 5”Ø 30 ft 30 ft
250,000 Use 5”Ø  Use 5”Ø 30 ft 30 ft

155,000 Btuh Heater:
Tube Heater Length 50 ft
1 x 90° elbow (vent) 5 ft
Straight vent 15 ft
1 x 90° elbow (duct) 5 ft
Air Duct: 4” Ø15 ft
Combined Length 90 ft
Max. Allowed 90 ft
Additional 10’ for 5” Ø Air Duct


A radiant tube heater will expand and contract as it heats and cools. Configuration of the vent must
allow for heater expansion.
 : Orientation of the vent at 90° to heater will allow for heater expansion and
contraction.
: (See FIG. 7)
◼ Wall Thimble or flashing at wall
that allows movement of the vent
through the opening. Do not seal
the vent to the thimble or flashing
with caulking
OR
◼ Offset vent with two x 90° elbows.
Install minimum 12 inch [305 mm]
length of straight vent between
elbows. Vent can be sealed with
caulking at non-combustible wall.
◼ Other means of slip fit installation
of the vent are acceptable provid-
ing there is adequate allowance
for free expansion and contraction
of the system, and free flow of
vent gases.

--

For vertical vent only, two heaters can be commonly vented using 4”x 6”x 4” Vent Tee 902000008.
Both heaters must be operated using one common thermostat. Common vent is 6 inch [150 mm] di-
ameter.
Category III (horizontal vent) heaters cannot be common vented.

15 HE+ Series Modulating Supplemental Manual
:
It is the sole responsibility of the installer to adhere to all current local codes and/or ANSI Z223.1
latest editions for all venting requirements, and practices. Also adhere to instructions below, and the
instructions of the vent manufacturer. Use vent materials certified for Category I.
All models of this series heater are certified Category I for vertical venting. See FIG. 5.
◼ The vent must extend at least 5 feet [1524 mm] above the flue collar of the highest connected
heater
◼ USA: Horizontal run of single wall vent or vent connector (“H” in FIG 5) must not exceed 75%
of the vertical height of the vent. If it does, then the vent system must be for Category III.
◼ Inputs up to 170,000 Btuh vertical vent can be 4” diameter Type B-Vent; greater than 170,000
Btuh must use 5” diameter Type B-Vent
◼ A vent connector must be secured to the flue collar using quantity 3 x #8 x 1/2” sheet metal
screws
◼ A horizontal vent connector shall be installed and supported without any dips or sags and
shall slope upward toward the vent or chimney at least 1/4 in./ft (20 mm/m).
◼ Use a certified termination cap as supplied by the manufacturer of the vent
◼ When vent and combustion air are taken through the roof, the exhaust vent should always
terminate higher than the combustion air intake, to prevent recycling the products of combus-
tion back into the heater
◼ The vent must extend at least 2 feet
[610 mm] above the highest point where
it passes through a roof. The vent must
also extend at least two feet higher than
any portion of a building within a hori-
zontal distance of 10 feet [3 m].
◼ Keep vent connector runs as short as
possible with a minimum number of el-
bows. Refer to the current edition of AN-
SI Z223.1 (NFPA 54) installation codes
for maximum length of horizontal vent
and vent connector.
◼ Total length of the vent connector and
vent pipe cannot exceed the values in
Table 4 above.
◼ A single-wall vent connector shall not be
insulated.
◼ For single−wall vent clearance to com-
bustibles is 6" [152mm] except where a
listed clearance thimble is used.
Clearance to combustible material
for Type B-Vent or factory-built
vent per the vent manufacturer’s
instructions.


16
HE+ Series Modulating Supplemental Manual
:
◼ When installed with a horizontal vent through a sidewall, this heater is a Category III appliance,
and venting materials must be approved for Category III applications.
◼ All vent must be installed in accordance with local codes or, in the absence of local codes, with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
◼ All vent must installed in accordance with these instructions, and the instructions of the vent
manufacturer.
◼ Do not mix vent components from different manufacturers in the vent system
◼ A single wall vent system may use a single continuous section of double wall vent pipe to pass
through an exterior wall.
◼ Any horizontal portion of the flue vent system must slope downwards away from the heater a
minimum of 1/4" per foot run [63 mm/ 300 mm] toward the vent terminal.
◼ All vent pipe from a single heater must be 4” [102 mm] diameter; common vent pipe for two
heaters must increase to 6” [152 mm] at the point of connection of individual 4” vents
◼ Use approved 4" [102 mm] (902000002) or 6" [152 mm] (902000007) horizontal wall vent ter-
minal or an approved high-wind termination cap
◼ Installation of the vent must prevent blockage by snow and protect building materials from deg-
radation by flue gases.
◼ Install termination cap a minimum of 18 inches (45 cm) from the outside wall to the inside edge
of terminal opening to alleviate back pressure caused by turbulent wind conditions (See Fig.
8). This also ensures flue gases are directed away from the structure to protect building mate-
rials from degradation by the exhausted flue gases.
◼ At most two 90° elbows can be installed in a horizontal vent
◼ A horizontal flue vent will not terminate less than 1 ft [30 cm] above grade level, unless its lo-
cation is adjacent to public walkways, then it must not terminate less than 7 ft [2.1m] above the
walkway.
◼ Clearance below a combustible overhang or soffit:
• As indicated in FIGURE 8 for approved terminations: 4" [100 mm] 902000002 or 6" [150
mm] 90200000.
• For other approved terminations: Will terminate 3 ft [915 mm] or more below a combustible
soffit or overhang.
◼ A horizontal vent termination must be a minimum of 6 feet [1830 mm] from an inside corner
formed by two exterior walls.
◼ A venting system shall be securely supported by noncombustible hangers suitable for the
weight of the materials.
◼ A slip joint in the horizontal section of a venting system shall be secured with quantity 3 x #8 x
1/2” sheet metal screws to prevent sagging.
◼ Seal single-wall vent seams and joints with Dow Corning 736 Heat Resistant Sealant 600°F
[315°C] or equivalent, or follow the instructions of the vent manufacturer for sealing vent pipe
connections
USA specific requirements for horizontal vent are on the next page

17 HE+ Series Modulating Supplemental Manual
specific horizontal vent requirements:
◼ The vent terminal of an appliance with an input up to 50,000 Btu/hr (14.7kW) shall be installed
with a 9 inch [230mm] vent termination clearance from any air opening into a building, and an
appliance with an input over 50,000 Btu/hr (14.7kW) shall have at least a 12 inch [305 mm]
vent termination clearance. The bottom of the vent terminal and the air intake shall be located
at least 12 inches [305 mm] above grade.
◼ A horizontal vent will not terminate:
• Less than 3 ft [915 mm] above a mechanical air inlet located within 10 ft [3 m]
• Less than 4 ft [1219 mm] below, 4 ft [1219 mm] horizontally from, and 1 ft [102 mm]
above any window or door that opens, or gravity air inlet to a building
• Less than 4 ft [1219 mm] horizontal clearance from gas and electric meters, regulators
and relief equipment

902000002
902000007
902000007902000002

18
HE+ Series Modulating Supplemental Manual
(WIRING DIAGRAMS NEXT PAGES)
The heater must be electrically grounded in accordance with the Nation-
al Electrical Code. ANSI / NFPA 70.
Appliance and control wiring must be in accordance with all applicable local codes. The total load of
all heaters must be considered in determining the required contact rating of the controlling thermo-
stat or switch. Each tube heater requires 120V, 60 HZ electrical power sized for 145VA. Maximum
power flow for internal 24V burner components is 21VA.
The Fenwal ignition control includes a 24V/120V relay switch that provides a 45 second pre-purge
and 45 second post-purge of the system. To maintain function of the post-purge feature, any
-
A line voltage Thermostat or an “ON/OFF” control switch installed in the 120VAC power supply will
disable the post-purge feature.
A maximum night set-back of 9°F (5°C) is recommended for optimum economy and comfort. To
maintain satisfactory comfort levels do not turn off the heating system over night/weekends.


◼ Refer to General Manual for requirements on gas supply and flexible gas connection to the heater.

  




NG 5.0 — 14.0 2.2 — 3.5
PROPANE 11.0 — 14.0 5.5 — 10.0

NG 5.0 — 14.0 1.8 — 3.5
PROPANE 11.0 — 14.0 4.5 — 10.0
 NG 5.0 — 14.0 2.0 — 3.5
PROPANE 11.0 — 14.0 4.5 — 10.0
 NG 5.0 — 14.0 1.8 — 3.5
PROPANE 11.0 — 14.0 4.5 — 10.0
 NG 6.5 — 14.0 2.3 — 4.0
PROPANE 11.0 — 14.0 5.0 — 10.0
 

19 HE+ Series Modulating Supplemental Manual







20
HE+ Series Modulating Supplemental Manual






