RenewAire HM-050 User manual

Indirect Gas Heat Module Shown
DN-Series
Integral Indirect Gas-Fired Heat Module
Supplemental Manual for Options

1.800.627.44992
Integral Indirect Gas-Fired Heat Module
OPTION
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in seri-
ous injury, death or property damage.
Be sure to read and understand the installation, operation
and service instructions in this manual.
Improper installation, adjustment, alteration, service or
maintenance can cause serious injury, death or property
damage.
AVERTISSEMENT
RISQUE D’INCENDIE OU D’EXPLOSION
Le non repsect des mises en garde pourrait entraîner des
blessures graves, la mort ou des pertes matérielles.
Prendre soin de lire et de comprendre les instructions
d’installation, de fonctionnement at d’entrention contenues
dans ce guide.
Une installation, un réglage, une modification, une répara-
tion ou un entretien inapproprié peut entraîner des bless-
ures graves, la mort ou des pertes matérielles.
WARNING
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
uDo not try to light any appliance.
uDo not touch any electrical switch; do not use any phone
in your building.
uLeave the building immediately.
uImmediately call your gas supplier from a phone remote
from the building. Follow the gas supplier’s instructions.
uIf you cannot reach your gas supplier, call the fire
department.
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
AVERTISSEMENT
Ne pas entreposer ni utiliser d’essence ou autre vapeurs ou
liquides inflammable à proximité de cet appareil ou de tout
autre appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ
uNe tentez pas d’allumer un appareil.
uNe touchez pas à un interrupteur; n’utilisez pas de télé-
phone dans l’édifice où vous vous trouvez.
uSortez de l’édifice immédiatement.
uAppelez immédiatement le fournisseur de gaz à par-
tir d’un téléphone à l’exterieur de l’édifice. Suivez les
instructions du fournisseur de gaz.
uSi vous ne pouvez joindre le fournisseur de gaz, appelez
les pompiers.
L’installation at les réparations doivent être confiées à un
installateur qualifié ou au fournisseur de gaz.
WARNING
ARC FLASH AND ELECTRIC SHOCK HAZARD
Arc flash and electric shock hazard. Disconnect all electric
power supplies, verify with a voltmeter that electric power
is off and wear protective equipment per NFPA 70E before
working within electric control enclosure. Failure to comply
can cause serious injury or death.
Customer must provide earth ground to unit, per NEC, CEC
and local codes, as applicable.
Before proceeding with installation, read all instructions,
verifying that all the parts are included and check the
nameplate to be sure the voltage matches available utility
power.
The line side of the disconnect switch contains live
high-voltage.
The only way to ensure that there is NO voltage inside the
unit is to install and open a remote disconnect switch and
verify that power is off with a volt
meter. Refer to unit electrical schematic.Follow all local
codes.
AVERTISSEMENT
RISQUE FLASH D’ARC ET DE CHOC ÉLECTRIQUE
Risque d’arc êlectrique et de choc électrique. Débrancher
toutes les alimentation électrique, vérifier avec un voltmètre
que l’alimentation électrique est coupée et portez des vête-
ments de protection conformément à la norme NFPA 70E
avant de travailler dans la console de commande électrique.
Le non-respect peut entraîner des blessures graves ou la
mort.
Le client doit fournir la terre à l’unité, selon les codes NEC,
CEC et locaux, selon le cas.
Avant de procéder à l’installation, lisez toutes les instruc-
tions, vérifiez que toutes les pièces sont incluses at vérifier
la plaque signalétique pour vous assurer que la tension
correspond à la puissance disponible du réseau.
Le côté entrée du sectionneur contient une haute tension
active.
La seule façon de s’assurer qu’il n’y a pas de tension à
l’intérieur de l’unité est d’installer et d’ouvrir un interrupteur
de déconnexion à distance et de vérifier que l’alimentation
est coupée à l’aide d’un voltmètre. Référe-vous au schéma
électrique de l’appareil.
Suivez tous les codes locaux.

31.800.627.4499
Integral Indirect Gas-Fired Heat Module OPTION
CAUTION
RISK OF ELECTRIC SHOCK OR EQUIPMENT DAMAGE.
Whenever electrical wiring is connected, disconnected
or changed, the power supply to the module and module
controls must be disconnected. Lock and tag the disconnect
switch or circuit breaker to prevent accidental reconnection
of electric power.
ATTENTION
RISQUE DE CHOC ELECTRIQUE OU DE DOMMAGE
D'APPAREIL
Chaque fois que le câblage électrique est connecté, décon-
necté ou changé, l'alimentation électrique du module et des
commandes du module doit être déconnectée. Verrouillez
et étiquetez le sectionneur ou le disjoncteur pour éviter une
reconnexion accidentelle de l'alimentation électrique.
CAUTION
Do not install units in locations where flue products can be
drawn into adjacent building openings such as windows,
fresh air intakes, etc.
Distance from vent terminal to adjacent public walkways,
adjacent buildings, operable windows and building openings
shall conform with the local codes. In the absence of local
codes, installation shall conform with the National Fuel
Gas Code, ANSI Z223.1 or the Canadian CAN/CGA B-149
Installation Codes.
ATTENTION
N'installez pas les appareils dans des endroits où les
produits de combustion peuvent être aspirés dans les
ouvertures de bâtiment adjacentes, comme les fenêtres, les
prises d'air frais, etc.
La distance entre le terminal de ventilation et les allées
publiques adjacentes, les bâtiments adjacents, les fenêtres
ouvrantes et les ouvertures de bâtiment doivent être con-
formes aux codes locaux. En l'absence de codes locaux,
l'installation doit être conforme au Code national du gaz
combustible, à la norme ANSI Z223.1 ou aux codes d'instal-
lation Canadiens CAN/CGA B-149.
CAUTION
Installation of wiring must conform with local building
codes. In the absence of local building codes, installation
must conform to the National Electric Code ANSI/NFPA
70-Latest Edition. Unit must be electrically grounded in
conformance with this code. In Canada, wiring must comply
with CSA C22.1, Canadian Electrical Code.
ATTENTION
L'installation du câblage doit être conforme aux codes du
bâtiment locaux. En l'absence de codes de construction
locaux, l'installation doit être conforme au Code national de
l'électricité ANSI/NFPA 70-dernière édition. L'unité doit être
mise à la terre électriquement conformément à ce code.
Au Canada, le câblage doit être conforme à la norme CSA
C22.1 du Code Canadien de l'électricité.
NOTICE
This equipment is to be installed by following Industry Best
Practices and all applicable codes. Any damage to com-
ponents, assemblies, subassemblies or the cabinet which
is caused by improper installation practices will void the
warranty.
IMPORTANT
Cet équipement doit être installé en suivant les meilleures
pratiques de l'industrie et tous les codes applicables. Tout
dommage aux composants, aux assemblages, aux sous-en-
sembles ou à l'armoire qui est causé par des pratiques
d'installation incorrectes annulera la garantie.
NOTE: SEE ADDITIONAL CAUTIONS
AND WARNINGS IN SECTION 4.8,
GAS PIPING INSTALLATION.
REMARQUE: VOIR LES MISES EN
GARDE ET LES AVERTISSEMENTS
SUPPLÉMENTAIRES DE LA
SECTION 4.8, INSTALLATION DE
TUYAUTERIE DE GAZ.

1.800.627.44994
Integral Indirect Gas-Fired Heat Module
OPTION
Record information as shown below. In the unlikely event that factory assistance is ever
required, this information will be needed.
Serial Number:
Unit Option Code:
SO#:
D--N G
Locate the RenewAire unit label, found on the outside of the unit.
NOTE: This information is for purposes of identifying the unit-specific option data from the
option code. See DN-SERIES IOM manual for further details.
UNIT INFORMATION
TYPICAL DN-SERIES UNIT LABEL
(FOUND ON THE OUTSIDE OF THE UNIT)
TYPICAL GAS HEATER RATING LABEL
SAVE THIS MANUAL
NOTICE
This manual contains essential information for the DOAS it is installed in. Space for
maintaining written records of heater maintenance and / or repairs is in the DOAS IOM. At
the time the DOAS is commissioned, a maintenance schedule should be developed by the
user to incorporate monthly and seasonal maintenance and include start-up maintenance
tasks as described in this manual.
UNIT INFORMATION
NOTE: This page
is to be completed
by the installing
contractor. The completed
document is to be turned
over to the owner after
start-up.
NOTE: Digit 17 of
the unit configura-
tion code (Option
Code) indicates that the
unit has an integral gas
heat module. For further
information on the DOAS
configuration code, see the
DN-Series Installation, Op-
eration, and Maintenance
Manual.

51.800.627.4499
Integral Indirect Gas-Fired Heat Module OPTION
1.0 OVERVIEW 7
1.1 DESCRIPTION .........................................................7
1.2 GAS SUPPLY...........................................................7
1.3 ELECTRICAL SUPPLY...............................................7
1.4 INPUT CAPACITY IN MBH [W]..................................7
1.5 GAS MODULE MODULATION (TURNDOWN)...............8
1.6 GAS VALVES ...........................................................8
1.7 IGNITION CONTROLLERS.........................................8
1.8 SIGNAL CONDITIONERS ..........................................9
1.9 MODULE HEAT RISE................................................9
1.10 USER INTERFACE..................................................9
1.11 GAS HEATER OPERATION ......................................9
2.0 SYSTEM REQUIREMENTS 10
2.1 VENTING ..............................................................10
2.1.1 Equivalent Length.............................................................. 10
2.1.2 Indoor Module Venting.......................................................10
2.1.2.1 Vertically Vented Heat Modules.......................................10
2.1.2.2 Horizontally Vented Heat Modules................................... 11
2.1.2.3 Two-Pipe Separate Combustion Systems........................12
2.1.3 Outdoor Module Venting .................................................... 14
2.2 GAS SUPPLY.........................................................14
2.3 ELECTRICAL SUPPLY.............................................15
2.3.1 Electrical Data .................................................................. 15
2.3.2 Electrical Schematics ......................................................17
3.0 PLACEMENT RECOMMENDATIONS 21
3.1 CLEARANCES TO COMBUSTIBLES .........................21
3.2 DUCTWORK ..........................................................21
4.0 COMPONENT TECHNICAL DATA 23
4.1 PERFORMANCE DATA ..........................................23
4.2 MODULE SIZE SELECTION.....................................24
4.3 MAXIMUM AND MINIMUM AIRFLOWS....................24
4.4 HEAT MODULE PRESSURE DROP...........................25
4.5 MODULE DATA CHART ..........................................25
4.6 GAS TRAIN SCHEMATIC ........................................26
4.7 GAS VALVE ILLUSTRATIONS ..................................27
4.8 DEFINITIONS FOR GAS HEAT MODULE 29
5.0 INSTALLATION 30
5.1 MODULE INSPECTION ON ARRIVAL........................30
5.2 PREPARING FOR INSTALLATION ............................30
5.3 INSTALLATION CODES ..........................................30
5.4 PLACEMENT OF MODULE......................................30
5.5 CLEARANCES ......................................................30
5.6 MODULE INSTALLATION REQUIREMENTS ..............32
5.7 INSTALL SUPPLY AIR TEMPERATURE SENSOR .......32
5.8 INSTALL GAS SUPPLY PIPING ................................32
5.8.1 Installation of Gas Piping...................................................32
5.8.2 Determine Gas Supply Requirements.................................33
5.9 CONNECT CONDENSATE DRAIN.............................34
6.0 OPERATION ........................................... 34
6.1 GAS HEATER QUICK-START GUIDE ........................34
6.2 VERIFY PROGRAMMING OF THE DOAS CONTROLLER
..................................................................................35
6.2.1 Disable the Integrated Controller .......................................35
6.2.2 Disable BMS Control.........................................................36
6.2.3 Verify the Controller is Configured for Heat........................36
6.2.4 Verify Heat Control Settings..............................................36
6.2.5 Verify That Heater Settings Will Call For Heat ....................37
6.3 TEST GAS PRESSURES AND FLAME QUALITY ........37
6.3.1 Enable the Unit Controller..................................................38
6.4 FAILURE TO IGNITE ...............................................38
6.5 TEMPERATURE RISE .............................................38
6.6 UNIT START-UP ADJUSTMENTS ............................39
6.6.1 Burner Flames ..................................................................39
6.6.2 Shutdown After Unit Start-Up............................................40
6.6.3 Configuring the Controller for Normal Operation ................40
6.6.4 Normal Operation .............................................................43
6.6.5 Restarting a Heat Module..................................................43
7.0 MAINTENANCE 43
7.1 MODULE INSPECTION ...........................................43
7.2 MODULE OPERATION CHECK.................................44
7.3 SERVICE PARTS....................................................44
8.0 TROUBLESHOOTING 45
8.1 SEQUENCE OF OPERATIONS (SOO)........................45
8.2 IGNITION CONTROLLER.........................................46
9.0 FACTORY ASSISTANCE 47
10.0 WARRANTY 47
TABLE OF CONTENTS

1.800.627.44996
Integral Indirect Gas-Fired Heat Module
OPTION
TABLE OF ILLUSTRATIONS
Figure 1.7.0 Ignition Controller (Typical) ..............................................................................................8
Figure 1.7.1 Maxitrol SC-30 Signal Conditioner....................................................................................8
Figure 1.9.0 Module Heat Rise Calculation...........................................................................................9
Figure 2.1.0 Indoor Vertical Venting for Flue Exhaust ......................................................................... 11
Figure 2.1.1 Indoor Horizontal Venting for Flue Exhaust...................................................................... 12
Figure 2.1.2 Vertical Venting-Separate Combustion ........................................................................... 13
Figure 2.1.3 Horizontal Venting-Separate Combustion........................................................................ 13
Figure 2.1.4 Outdoor Horizontal Venting............................................................................................. 14
Figure 2.2.0 Example of Multiple DOAS Supply Gas Piping................................................................. 15
Figure 2.3.0 Module FLA .................................................................................................................. 16
Figure 3.2.0 Outdoor Horizontal Ductwork Configuration ...................................................................22
Figure 3.2.1 Indoor Horizontal Ductwork Configuration ......................................................................22
Figure 3.2.2 Outdoor Vertical Ductwork Configuration .......................................................................22
Figure 4.1.0 50–350 MBH Temperature and Pressure Chart ..............................................................23
Figure 4.6.0 Example of Modulated Gas Train....................................................................................26
Figure 4.7.0 Single Stage Gas Valves (Typical)...................................................................................27
Figure 4.7.1 Two-Stage Gas Valves (Typical)......................................................................................27
Figure 4.7.2 Modulating Gas Valves (Typical) .....................................................................................28
Figure 5.6.0 Installation Example......................................................................................................32
Figure 5.8.0 Typical Data Label.........................................................................................................33
Figure 5.8.1 Typical Gas Supply Piping Connection ............................................................................33
Figure 5.9.0 Recommended Drain Trap Construction .........................................................................34
Figure 6.2.0 DOAS Controller............................................................................................................35
Figure 6.6.0 Burner Flame at 1.2 InWC [298 Pa] Manifold Pressure....................................................39
Figure 6.6.1 Burner Flame at High Fire 3.5 InWC [871 Pa] Manifold Pressure .....................................39
Figure 7.3.0 Service Parts—Modulated Control.................................................................................44
Figure 8.0.0 Maxitrol SC-30 Signal Conditioner.................................................................................45
Figure 8.2.0 Series 5 Ignition Controller ............................................................................................46
TABLE OF WIRING SCHEMATICS
Figure 2.3.1 Control Wiring, 5:1 Turndown Module, 50–150 MBH....................................................... 17
Figure 2.3.2 Control Wiring, 5:1 Turndown Module, 200–350 MBH.................................................... 18
Figure 2.3.3 Control Wiring, 10:1 Turndown Module, 200–250 MBH .................................................. 19
Figure 2.3.4 Control Wiring, 10:1 Turndown Module, 300–350 MBH .................................................20

71.800.627.4499
Integral Indirect Gas-Fired Heat Module OPTION
1.0 OVERVIEW
1.1 DESCRIPTION
The gas heater found in the RenewAIre DN unit is an indirect gas fired heat module, classified
as either Category I or Category III. Flue gas venting is either horizontal (through the wall)
or vertical (through the roof). Modules can be ordered in several different BTU inputs. All
modules produce a low pressure drop and are enclosed within a galvanized steel cabinet. The
temperature rise across the module is 20–60˚F [11.2–33.3˚C].
THESE HEAT MODULES COMPLY WITH ANSI Z83.8 AND CSA 2.6M GAS-FIRED HEAT MODULE
1.2 GAS SUPPLY
RenewAire gas-fired heat modules can be ordered with either natural gas or LP gas as a fuel
source, not to exceed pressure of 13.5 inches water Column (InWC) [3,359 Pa]. For all modules:
uNatural gas supply pressure must be a minimum of 5 InWC [1,244 Pa] and a maximum of
13.5 InWC [3,359 Pa].
uPropane gas supply pressure must be a minimum of 12 InWC [2,986 Pa] and a maximum
of 13.5 InWC [3,359 Pa].
uIf gas pressure exceeds 13.5 InWC [3,359 Pa], an additional regulating valve must be field-
supplied and installed.
1.3 ELECTRICAL SUPPLY
The gas heat module is factory-wired and requires no additional field wiring. Line voltage
readings between L1 and Neutral as well as L1 and Ground should be within +/- 3 volts of the
voltage rating on the module data label, found on the front of the heat module.
1.4 INPUT CAPACITY IN MBH [W]
Gas module sizes are based upon the INPUT MBH (thousands of BTUs per hour) [Watts]. This
is a measure of heat energy available and is not to be confused with heat output, which is
affected by the efficiency of the module. Modules are available in the following input capacities:
u50 MBH [14,653 W]
u75 MBH [21,980 W]
u100 MBH [29,307 W]
u125 MBH [36,633 W]
u150 MBH [43,960 W]
u200 MBH [58,614 W]
u250 MBH [73,267 W]
u300 MBH [87,921 W]
u350 MBH [102,574 W]
IMPORTANT
The gas module sizes shown above are rated for installation at altitudes up to 2,000 feet
[610 m]. Starting at altitudes above 2,000 feet [610 m], appliances should be de-rated 4
percent and another 4% for each 1,000 feet [305 m] of elevation above 2,000 feet. Example:
2000–2999 Ft = 4% de-rate
3000–3999 Ft = 8% de-rate
4000–4999 Ft = 12% de-rate
5000–5999 Ft = 16% de-rate
6000–6999 Ft = 20% de-rate
7000 Ft and above, consult factory
NOTE: This unit is
an integral indirect
gas-fired heat mod-
ule that will be referred
to in this manual as a
module.
NOTE: Within this
manual, U.S. units
of measure are
given first and then the
SI version is provided in
brackets [ ] immediately
after.
NOTE: All indirect
gas-fired heat
modules are 80%
efficient.
OVERVIEW

1.800.627.44998
Integral Indirect Gas-Fired Heat Module
OPTION
1.5 GAS MODULE MODULATION (TURNDOWN)
Turndown is a gas module operating mode in which the input gas volume is reduced to provide
more consistent heating of the Occupied Space. Example: a 200 MBH input module is being
used to provide heat when ambient conditions call for only a small amount of added heat.
Rather than the module running at full output for a brief period, the gas supply is reduced in
order to provide a smaller heat output, which allows the module to run for a longer period,
improving hysteresis. Each modulation scheme requires that the gas train be designed for
that specific turndown scheme. Modulation of the gas supply typically involves a different gas
valve or valves, some programming differences to the onboard controller and a different gas
manifold. All heat modules are modulated. RenewAire gas heat modules are available with the
following turndown options:
u5:1 Modulation (available for gas heat modules 50–350 MBH)
u10:1 Modulation (available for gas heat modules 200–350 MBH)
Module turndown is expressed as a ratio of the maximum to minimum heat output. Example: a
module that can deliver as little as one tenth of its maximum rating is said to have a turndown
ratio of 10:1.
1.6 GAS VALVES
Gas valves used in RenewAire gas heat modules are 1-stage, 2-stage and modulated. See
Section 4.7 Gas Valve Illustrations in this manual. Every gas valve is normally closed (NC) and
requires an activating signal from an ignition controller to activate the valve solenoid. If the
valve is 2-stage, an additional signal from the signal conditioner is required to change the
gas output to the second level, or stage. If the valve is modulating, a variable (analog) signal
is required from the signal conditioner to vary the gas output from the valve. Staged valves
(either 1-stage or 2-stage) have fixed output levels for each stage. A modulating valve provides
a variable output, dependent on a 0–10 volt signal sent to the valve from the Maxitrol Signal
Conditioner. Modulating valves are used in conjunction with staged valves to arrive at the
desired turndown.
1.7 IGNITION CONTROLLERS
Each gas manifold or each section of a split manifold has its own ignition system, controlled
by a Capable Controls Series 5 ignition controller. The ignition controller controls the ignition
spark, the flame sensor, air proving switch and activates the solenoid on the gas valve.
Heat modules with 5:1 turndown generally have only one ignition controller and a single gas
manifold. Heat modules with 10:1 turndown generally have a split gas manifold with two ignition
controllers and two ignition systems.
FIGURE 1.7.0 IGNITION CONTROLLER (TYPICAL) FIGURE 1.7.1 MAXITROL SC-30 SIGNAL CONDITIONER
MODEL SC-30 USED TO ACHIEVE 10:1 TURNDOWN IN 3-VALVE SCHEMES
MODEL SC-40 USED TO ACHIEVE 5:1 TURNDOWN IN 2-VALVE SCHEMES
OVERVIEW

91.800.627.4499
Integral Indirect Gas-Fired Heat Module OPTION
FIGURE 1.9.0 MODULE HEAT RISE CALCULATION
4939 CFM [2331 l/s]
45 ˚F [7.2 ˚C]
Entering Air Temp
300,000 Btuh [87,921 W]
Input
45 ˚F [25 ˚C] Rise
90 ˚F [32.2 ˚C]
Discharge
Air Temp
Pressure Drop .22" WC [54 Pa]
1.8 SIGNAL CONDITIONERS
Signal conditioners are used in all heat modules to control the outputs of the gas valves. In
general, they modulate a modulating gas valve by providing either a 0–10 VDC or a 2–10 VDC
signal to the valve. See photo on previous page.
1.9 MODULE HEAT RISE
All modules are installed on the positive pressure side of the fan.
uMaximum allowable discharge temperature is 160˚F [71˚C] for any installation.
uMaximum allowable temperature rise is 60˚F [33.3˚C]
uMaximum design duct static pressure is 3.0 InWC [746.5 Pa].
Note that the example below is based upon a specific Entering Air temperature. As Entering Air
temperatures vary, the resulting temperature rise also varies.
1.10 USER INTERFACE
The User Interface (U/I) is the device used to control operation of the module. This module is an
integral part of a DN unit and is therefore controlled by the on-board Integrated Programmable
Control.
1.11 GAS HEATER OPERATION
The heater receives high-voltage power from the DOAS disconnect switch. High-voltage power
from the unit disconnect switch runs to a step-down transformer in the gas heat compartment.
Primary input voltage to the transformer is the unit voltage. Secondary output voltage to the gas
heat draft inducer blower is 115 VAC. Both sides of the step-down transformer are fused.
The heater receives a 0–10 VDC activating signal from the Integrated Programmable Controller.
The activating control signal wires terminate on the signal conditioner. The signal conditioner
controls the output of the gas valves in proportion to the 0–10 VDC signal.
Heater operation and output is controlled by the unit Integrated Programmable Controller based
on desired temperature. The heater shuts off when the controller senses that the desired
temperature is met and shuts off the activating signal.
The heater will switch off if insufficient combustion airflow is detected. The heater will
also switch itself off if an over-temperature condition occurs. This condition is identified by
intermittent or no heating. If this occurs, the cause of the over-temperature condition should be
identified and corrected.
OVERVIEW

1.800.627.449910
Integral Indirect Gas-Fired Heat Module
OPTION
2.0 SYSTEM REQUIREMENTS
2.1 VENTING
2.1.1 Equivalent Length
Vent pipe lengths are given as “equivalent lengths.” When vent pipes are installed, they often
require that an elbow(s) be installed as part of the vent pipe. Elbows restrict free flow of gases
through the vent pipe. A 90˚ elbow added to a straight run of vent pipe is the equivalent of
adding 5' [1.5 m] of length to the vent and adding a 45˚ elbow is the equivalent of adding 2.5'
[0.75 m] in length.
Example: A horizontal vent is 6.5' [2 m] long, but it has a 45˚ elbow in the middle. Its equivalent
length is therefore 9' [2.75 m] (6.5' + 2.5') [2 m + 0.75 m]. If this horizontal run of venting were
being used in conjunction with a vertical run of venting, the minimum length of the vertical run
must be 12' [3.66 m] (horizontal equivalent length < 75% of vertical length).
2.1.2 Indoor Module Venting
All heat modules must be connected to a venting system to convey flue gases outside of the
building.
Vent systems must be sized and installed in accordance with ANSI Z223.1 (NFPA 54) or in
Canada CAN/CGA—B149. There are three acceptable methods for venting indoor module
installations:
uVertical Indoor venting—uses building air for combustion, vent pipe run outdoors through
single roof penetration.
uHorizontal Indoor venting—uses building air for combustion, vent pipe run outdoors through
single wall penetration
uSeparate Combustion 2-Pipe venting—uses outside air for combustion, vents outdoors—two
roof or wall penetrations.
2.1.2.1 Vertically Vented Heat Modules
Proper venting of the heat module is the responsibility of the installer. Vent piping is supplied by
others. When operated with the venting system in place, proper heat module operation must be
verified, including flue gas analysis of each connected module.
1. Use single wall or double wall (Type B) vent pipe of diameters shown below:
INPUT RATING (BTUh) INPUT RATING [W] VENT PIPE DIA.
50,000–199,999 14,653–58,614 5 in. [12.7 cm]
200,000–350,000 58,616–102,574 6 in. [15.25 cm]
2. Maximize the height of the vertical run of vent pipe. A minimum of 5 feet [1.5m] of vertical
pipe is required. The top of the vent pipe must extend at least 2 feet [0.61m] above the
highest point on the roof. (Use Listed Type B vent for external runs).
3. An approved weatherproof vent cap must be installed to the vent termination.
4. Horizontal runs must not exceed 75% of the vertical height of the vent pipe, up to a maximum
of 10 feet [3m]. Horizontal runs should be pitched downward ¼ inch per foot (21 mm/m) and
should be supported at 3 foot [1m] maximum intervals.
5. Design vent pipe runs to minimize the use of elbows. Each 90˚ elbow is equivalent to 5 feet
[1.5m] of straight vent pipe run.
6. Vent pipe should not be run through unheated spaces. If such runs cannot be avoided,
insulate vent pipe to prevent condensation inside vent pipe. Insulation should be a minimum
of ½ inch (12.7 mm) thick, foil faced material suitable for temperatures up to 500˚F [260˚C].
7. Dampers must not be used in vent piping runs. Spillage of flue gases into the occupied space
could result.
8. Vent connectors serving Category 1 heaters must not be connected into any portion of a
mechanical draft system operating under positive pressure.
SYSTEM REQUIREMENTS