Camus Hydronics Avenger Series Setup guide

99-0600 Rev.03
Avenger® Series
Installation, Operation and Service Manual
Gas Fired Commercial Condensing Stainless Steel Boilers
Hydronic Heating Models ARH1000 thru ARH4000
Hot Water Heater Models ARW1000 thru ARW4000
WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury
or death.
WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance,
•Do not touch any electrical switch; do not use any phone in your building,
•Immediately call your gas supplier from a neighbour’s phone. Follow the gas supplier’s instructions,
•If you cannot reach your gas supplier, call the fire department.
A Qualified installer, service agency or the gas supplier must perform installation and service.
WARNING
Do not store or use gasoline or other flammable vapours and liquids in the vicinity of this or any other appliance.
TO THE INSTALLER: After installation, these instructions must be given to the end user or left on or near the appliance.
TO THE END USER: This booklet contains important information about this appliance. Retain for future reference.
H
HLW

Table of Contents
PART 1 GENERAL INFORMATION .....................................................................................................................................................................1
1.1 INTRODUCTION..........................................................................................................................................................................................1
1.2 SPECIAL INSTRUCTIONS TO OWNER ......................................................................................................................................................1
1.3 CHECKING EQUIPMENT ............................................................................................................................................................................2
1.4 SEQUENCE OF OPERATION......................................................................................................................................................................2
1.4.1 HEAT TRANSFER PROCESS...........................................................................................................................................................3
1.4.2 END OF SEQUENCE ........................................................................................................................................................................4
1.5 CODES ........................................................................................................................................................................................................4
1.6 WARRANTY.................................................................................................................................................................................................4
1.7 REMOVAL OF EXISTING APPLIANCE........................................................................................................................................................5
1.8 BOILER ROOM OPERATING CONDITION..................................................................................................................................................6
1.9 CLEARANCE FROM COMBUSTIBLE MATERIAL .......................................................................................................................................6
1.10 INSTALLATION PROCEDURE AND LOCATION OF UNIT ..........................................................................................................................7
1.11 SPECIFICATIONS AND DIMENSIONAL DATA............................................................................................................................................8
PART 2 VENTING & AIR SUPPLY..................................................................................................................................................................................10
2.1 GENERAL VENTING GUIDE .....................................................................................................................................................................10
2.1.1 CATEGORY II AND CATEGORY IV VENTING................................................................................................................................11
2.1.2 VENTING GUIDELINES FOR CATEGORY II AND/OR IV VENTING ............................................................................................... 11
2.1.3 APPROVED VENTING MATERIALS ...............................................................................................................................................11
2.1.4 VENT TERMINATION CLEARANCES.............................................................................................................................................12
2.1.5 INLET CAP FOR ROOFTOP TERMINATION ..................................................................................................................................12
2.1.6 LOCATION OF A ROOFTOP AIR INLET AND VENT CAPS............................................................................................................12
2.1.7 AIR INLET DAMPER .......................................................................................................................................................................13
2.1.8 MASONRY CHIMNEY INSULATIONS.............................................................................................................................................13
2.1.9 VERTICAL VENTING TERMINATION .............................................................................................................................................13
2.1.10 COMBINED COMBUSTION AIR INLET...........................................................................................................................................13
2.1.11 DRAIN TEE .....................................................................................................................................................................................14
2.2 CONVENTIONAL VENTING (INDOOR) INSTALLATIONS......................................................................................................................... 15
2.2.1 AIR REQUIRED FOR COMBUSTION AND VENTILATION .............................................................................................................15
2.2.2 EXHAUST FANS .............................................................................................................................................................................15
2.3 OUTDOOR VENTING (Pending) ................................................................................................................................................................15
2.4 SIDEWALL VENTING ................................................................................................................................................................................16
2.4.1 SIDEWALL VENT TERMINAL & SIDEWALL INTAKE AIR TERMINAL ............................................................................................ 16
2.4.2 LOCATION OF A SIDEWALL VENT TERMINATION.......................................................................................................................16
2.4.3 LOCATION OF A SIDEWALL AIR INLET TERMINAL......................................................................................................................18
2.4.4 LENGTH OF AIR INLET PIPE .........................................................................................................................................................18
PART 3 GAS CONNECTIONS ...........................................................................................................................................................................19
3.1 GAS CONNECTION...................................................................................................................................................................................19
3.2 GAS PIPING ..............................................................................................................................................................................................19
3.3 INSTALL PIPING........................................................................................................................................................................................19
3.4 AIR/GAS RATIO VALVE ............................................................................................................................................................................20
3.5 OPERATION OF NEGATIVE PRESSURE AND DIFFERENTIAL PRESSURE VALVES............................................................................ 21
3.6 GAS MANIFOLD DIFFERENTIAL PRESSURE ADJUSTMENT ................................................................................................................. 21
3.7 CHECKING GAS SUPPLY PRESSURE.....................................................................................................................................................21
3.7.1 REGULATED GAS SUPPLY PRESSURES FOR AVENGER BOILERS & WATER HEATERS........................................................ 22
3.8 CHECKING DIFFERENTIAL AIR AND DIFFERENTIAL GAS PRESSURES .............................................................................................. 22
3.9 GAS TRAIN AND CONTROLS................................................................................................................................................................... 23
3.10 VENTING OF GAS VALVES AND PRESSURE SWITCHES......................................................................................................................24

3.11 BURNER ....................................................................................................................................................................................................24
PART 4 WATER CONNECTION ........................................................................................................................................................................25
4.1 FREEZE PROTECTION.............................................................................................................................................................................25
4.2 WARNING REGARDING CHILLED WATER AND HEATING COIL SYSTEMS .......................................................................................... 26
4.3 INLET AND OUTLET CONNECTIONS....................................................................................................................................................... 26
4.4 MINIMUM PIPE SIZE REQUIREMENTS....................................................................................................................................................26
4.5 HEAT EXCHANGER ..................................................................................................................................................................................26
4.6 LOW WATER TEMPERATURE SYSTEMS................................................................................................................................................26
4.7 INSTANTANEOUS WATER HEATER ........................................................................................................................................................27
4.8 WATER HEATER THERMOSTAT SETTING .............................................................................................................................................27
4.9 WATER FLOW SWITCH ............................................................................................................................................................................27
4.10 LOW WATER CUTOFF.............................................................................................................................................................................27
4.11 RELIEF VALVE ..........................................................................................................................................................................................28
4.12 CIRCULATING PUMP SELECTION ...........................................................................................................................................................28
4.12.1 CIRCULATING PUMP OPERATION OF HEAT EXCHANGER ........................................................................................................28
4.13 ∆T HEAT EXCHANGER ALGORITHM .......................................................................................................................................................29
PART 5 ELECTRICAL & CONTROLS ................................................................................................................................................................31
5.1 ELECTRICAL CONNECTIONS ..................................................................................................................................................................31
5.2 VARIABLE FREQUENCY DRIVE...............................................................................................................................................................32
5.3 ELECTRONIC LOW AIR PRESSURE SWITCH (DIFFERENTIAL).............................................................................................................32
5.4 BLOCKED FLUE SWITCH ......................................................................................................................................................................... 33
5.5 HIGH AND LOW GAS PRESSURE SWITCHES ........................................................................................................................................33
5.6 HIGH LIMIT................................................................................................................................................................................................33
5.7 AVENGER SOLA .......................................................................................................................................................................................33
5.7.1 SERVICE PARTS ............................................................................................................................................................................34
5.7.2 IGNITION MODULE LOCKOUT FUNCTIONS ................................................................................................................................. 34
5.8 AVENGER CONTROLLER.........................................................................................................................................................................34
5.9 ERROR TABLE..........................................................................................................................................................................................34
PART 6 CONTROL PANEL................................................................................................................................................................................37
6.1 APPLIANCE TEMPERATURE CONTROLLER...........................................................................................................................................37
6.2 CONFIGURE MENU ..................................................................................................................................................................................48
6.2.1 SYSTEM IDENTIFICATION & ACCESS ..........................................................................................................................................48
6.2.2 PUMP CONFIGURATION................................................................................................................................................................48
6.2.3 STATISTICS CONFIGURATION .....................................................................................................................................................49
6.2.4 BURNER CONTROL TIMING AND RATES .....................................................................................................................................49
6.2.5 BURNER CONTROL IGNITION.......................................................................................................................................................49
6.2.6 SENSOR CONFIGURATION ...........................................................................................................................................................50
6.3 LEAD LAG SETUP.....................................................................................................................................................................................50
6.4 LOCAL/REMOTE SWITCH ........................................................................................................................................................................51
6.5 MODBUS, BACNET IP, BACNET MSTP, LONWORKS, METASYSN2 INTEGRATION ............................................................................. 51
6.6 VARIABLE FREQUENCY DRIVE...............................................................................................................................................................52
6.7 FROST PROTECTION...............................................................................................................................................................................52
PART 7 COMPONENTS ....................................................................................................................................................................................53
7.1 HOT SURFACE IGNITOR..........................................................................................................................................................................53
7.2 UV SCANNER............................................................................................................................................................................................53
7.3 STAGING RELAY ......................................................................................................................................................................................53
7.4 OUTER JACKET........................................................................................................................................................................................54
7.5 VENTING TRANSITION .............................................................................................................................................................................54
7.6 CONDENSATION COLLECTION ...............................................................................................................................................................54
7.7 COMBUSTION AIR FAN ............................................................................................................................................................................54

PART 8 FIELD STARTUP PROCEDURES ........................................................................................................................................................55
8.1 CHECKING THE INSTALLATION ..............................................................................................................................................................55
8.2 CHECKING THE CONSTRUCTION ...........................................................................................................................................................55
8.3 GAS VALVE ADJUSTMENT PROCEDURE ...............................................................................................................................................55
8.4 COMISSIONING APPLIANCE....................................................................................................................................................................59
PART 9 TROUBLESHOOTING ..........................................................................................................................................................................60
PART 10 MAINTENANCE....................................................................................................................................................................................66
10.1 EXAMINE THE VENTING SYSTEM........................................................................................................................................................... 66
10.2 VISUALLY CHECK MAIN BURNER FLAMES ............................................................................................................................................66
10.3 FLUE GAS PASSAGEWAYS CLEANING PROCEDURES.........................................................................................................................66
10.4 CONDENSATION TREATMENT ................................................................................................................................................................67
10.4.1 CONDENSATE VOLUME ................................................................................................................................................................67
10.5 BURNER MAINTENANCE .........................................................................................................................................................................67
10.5.1 BURNER REMOVAL..................................................................................................................................................................................67
10.5.2 BURNER CLEANING PROCEDURE..........................................................................................................................................................68
10.6 CHANGING THE HOT SURFACE IGNITER ..............................................................................................................................................68
10.6.1 REMOVING THE IGNITER..............................................................................................................................................................68
10.6.2 RE-INSTALLING THE IGNITER ......................................................................................................................................................68
10.7 HEAT EXCHANGER INSPECTION............................................................................................................................................................68
10.8 RE-INSTALL HEAT EXCHANGER.............................................................................................................................................................69
10.9 COMBUSTION AIR FAN ............................................................................................................................................................................69
10.10 COMBUSTION AND VENTILATION AIR....................................................................................................................................................69
10.11 CONTROL CIRCUIT VOLTAGE.................................................................................................................................................................69
10.12 COMBUSTIBLE MATERIALS.....................................................................................................................................................................69
10.13 FREEZE PROTECTION.............................................................................................................................................................................69
10.14 FREEZE PROTECTION FOR A HEATING BOILER SYSTEM (Optional).................................................................................................. 69
PART 11 INSTALLATIONS ..................................................................................................................................................................................70
11.1 CHECKING THE INSTALLATION ..............................................................................................................................................................70
11.2 INSPECT & RECHARGE CONDENSATE COLLECTION & NEUTRALIZING RESERVOIR ....................................................................... 70
11.3 HEATING BOILER INSTALLATIONS.........................................................................................................................................................70
11.4 WATER CONNECTIONS ...........................................................................................................................................................................71
11.5 PIPING LENGTHS .....................................................................................................................................................................................71
11.6 INTERMITTENT PUMP OPERATION ........................................................................................................................................................71
11.7 SUMMARY.................................................................................................................................................................................................71
11.8 DOMESTIC HOT WATER HEATER ...........................................................................................................................................................73
11.9 WATER THERMOSTAT SETTING.............................................................................................................................................................73
11.10 WATER FLOW CONTROL.........................................................................................................................................................................73
11.11 TEMPERATURE RISE AT FULL FIRING RATE.........................................................................................................................................74
11.12 WATER HEATERS ....................................................................................................................................................................................74
PART 12 EXPLODED VIEW ................................................................................................................................................................................75
PART 13 ELECTRICAL DIAGRAMS ....................................................................................................................................................................87
CONDENSING BOILER LIMITED WARRANTY ............................................................................................................................................................ 102

1
PART 1 GENERAL INFORMATION
1.1 INTRODUCTION
The Avenger is a condensing, forced draft, fire tube boiler and water heater utilizing a premix power burner based on a push through
design which offers several venting options. Heat output is controlled by air/gas ratio control gas valves which provide seamless
modulation. The Avenger provides central heating or domestic hot water at working pressures up to 160 PSI. It is designed for use with
a pumped and pressurized system. The boiler/water heater will automatically modulate to provide heat outputs between 100% and the
minimum input.
All Avenger models use two automatic gas valves - one at the low end and one at the high end. The High-End Gas Valve works on the
principle of differential pressure. Operation of the fan along with modulating air actuator, generates a differential air pressure, which the
air/gas ratio control gas valve matches on the gas side. The steady state efficiency is maintained across the entire range of modulation.
Air and gas are metered in precise proportion (1:1 Ratio) to modulation signal, allowing combustion characteristics, which determine
efficiency, to remain the same over the entire operating range. The Low-End Gas Valve works on the principle of negative pressure.
1.2 SPECIAL INSTRUCTIONS TO OWNER
This installation and service manual supplies information for the installation, operation and servicing of the appliance. It is strongly
recommended that this manual be reviewed completely before proceeding with an installation.
CAUTION
It is important that all gas appliances are installed by a qualified installer/technician that is trained by Camus Hydronics Limited. It is in
your own interest and that of safety to ensure that all local codes, and all the following “NOTES” and “WARNINGS” are complied with.
Installing, servicing or adjusting this appliance should be performed only by a qualified installer/technician that is trained by Camus
Hydronics Limited. The serviceman must utilize a combustion analyzer with CO2, CO, and draft gauge to set the appliance according
to Camus Hydronics Limited’s recommendations, prior to commissioning.
NOTE
RETAIN THIS MANUAL FOR FUTURE REFERENCE
Figure 1: Avenger Heat Exchanger and Complete Unit

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1.3 CHECKING EQUIPMENT
Check for signs of shipping damage upon receiving equipment. Pay attention to parts accompanying the boiler, which may show signs of
mishandling. Verify total number of pieces shown on packing slip with those received. In case there is damage or a shortage, immediately
notify carrier.
Figure 2: Checking the Avenger Unit
Do not attempt to pry any panels off. To begin disassembly, you can remove the top panel and side panels without the use of any tools.
Once you have removed the top panels, carefully check and confirm that all ¼” copper tubing connections are intact and have not broken
or loosened in shipment. Leaks at any connections on these lines will result in erratic appliance operation.
1.4 SEQUENCE OF OPERATION
1. Supply power connection as per Table 9.
2. The power switch is placed in the “ON” position.
3. 120 VAC power is supplied to the control transformer.
4. 24 VAC is supplied to the ignition module and low voltage controls.
5. After the appliance water pump starts, flow is proven by the Flow Switch and Water Pressure Switch. The Water Pressure
Switch is set to 12 PSI or higher and is installed inside the unit’s jacket. The Flow Switch is mounted at the outlet of the
appliance. If installing a Flow Switch, it is required to properly trim the Flow Switch Paddles in order not to jam the switch in the
tee. The normally open dry contacts in the Low Water Cutoff (LWCO) are to be wired in series with the normally open contacts
of the Flow Switch. Locate the probe type LWCO in the piping above the boiler inlet/outlet connection. In all cases, check with
local codes.
6. The Avenger controller receives a call for heat via the remote operator contacts and the Demand parameter reads Central
Heating, DHW, or Lead Lag Slave.
7. The Avenger controller closes the pump contacts to start the pump, which then causes the Flow Switch to close once minimum
flow is reached. If all limit controls are made including temperature, water pressure and water flow, the controller closes the
blower contacts to initiate the variable frequency drive (VFD) and allows 60 seconds for VFD to ramp up the frequency to the
3 phase motor of the Combustion Fan using the modulating signal provided by the on board modulating control or the remote
operating system. If the Low Air Switch contacts are made within the 60 seconds, the VFD will run at Pre-Purge speed until the
Pre-Purge timer is satisfied.
8. Once the Pre-Purge Timer is satisfied, the Avenger controller will target the ignition fan speed.
9. a) AR1000 – AR2500 (Direct Ignition): The Avenger controller will activate the Hot Surface Igniter for 28 seconds followed by
energizing the Low-End Gas Valve. A signal of 0.8 Vdc minimum must be recognized by the controller at the UV Scanner to
keep the Low-End Gas Valve in the open position. The fan is kept at ignition speed until the flame is stabilized. As demand

3
increases the modulation signal causes the Low-End Gas Valve to draw more gas. If the Low-End Gas Valve cannot satisfy
demand, at a preset point the staging relay activates the Hot Surface Igniter to provide seamless transition to the High-End
Gas Valve. The fan inlet damper opens and directs power to the High-End Gas Valve while shutting off the Low-End Gas Valve.
As target temperature is approached, the demand signal is reduced and at a pre-set point the hot surface ignitor is activated,
the High-End Gas Valve shuts off and the Low-End Gas Valve is energized. At the same time the fan inlet damper is closed.
As demand continues to decrease the Low-End Gas Valve shuts off and the boiler proceeds to post purge.
b) AR3000 - AR4000 (Proven Pilot): The Avenger controller will activate the Hot Surface Igniter for 22 seconds followed by
energizing the Pilot Valve for 10 seconds, whereupon a signal of 0.8 Vdc must be recognized by the controller at the UV
Scanner to keep the Pilot Valve in an open position. The fan is kept at ignition speed until the stabilization timer is satisfied.
After the stabilization timer expires the Low-End Gas Valve is opened and the Pilot Valve is deactivated. As demand increases,
the modulation signal causes the Low-End Valve to draw more gas and the sequence as detailed in (a) above is followed.
10. If the flame signal is not reached, the module will stop the ignition sequence after the “Main Gas On” period & recycle.
11. The fan speed will slowly decrease as the temperature nears the target. The modulation rate is controlled via a 4-20 mA signal.
If the heat demand is sustained without change, the boiler firing rate will reach a point of steady-state and the fan will rotate at
constant speed.
12. When the heat demand is satisfied or the remote enable is removed, the burner will shut off and the fan speed will ramp up to
the preset Post-Purge speed until the Post-Purge timer is satisfied.
13. The pump continues to circulate until the Post-Purge time is satisfied.
14. The boiler will then go into Standby as it waits for the next heat demand or remote enable.
NOTE
The Hot Surface Igniter is energized with 115V AC when control is switching to/from the High-End Gas Valve to the Low-End Gas
Valve. To avoid shock do not contact bare Ignitor wires at this time
Figure 3: Avenger Ignition Cycle
NOTE:
1. If a flame signal is detected at the end of the Pre-Purge period, an error will occur.
2. If at the end of the safety period (4 sec) no flame is detected, the control will go to Post-Purge to remove the unburned gas.
After this, a re-ignition attempt is started following the same cycle. The number of re-ignition attempts is limited to 2 after which
a lockout occurs.
3. The burner can only be ON continuously for a period of 24 hours. After this, the burner is switched OFF and a restart sequence
follows.
4. The Hot Surface Igniter is de-energized at the end of the ignition period to allow for ionization detection.
1.4.1 HEAT TRANSFER PROCESS
1. Burner input rate continues to increase until water temperature reaches the set point temperature.
2. Burner input rate may stabilize at a fixed rate when demand equals input.
3. Burner input rate will decrease when water temperate approaches temperature set point.

4
1.4.2 END OF SEQUENCE
1. Set point temperature is reached.
2. Power to the gas valve is turned off.
3. Combustion air fan ramps to a stop over the factory pre-programmed time period.
4. Thermostat is now in a standby mode waiting for the next “Call for Heat”.
WARNING
To minimize the possibility of serious personal injury, fire or damage
to your appliance, never violate the following safety rules.
WARNING
IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE can cause injury or property damage.
Refer to this manual. For additional information, consult a qualified installer, service agency or gas supplier.
WARNING
Do not use this appliance if any part of it has been under water. The possible damage to a flooded appliance can be extensive and
present numerous safety hazards. Any appliance that has been under water must be replaced.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance. Do not touch any electric switch. Do not use any phone in your building. Immediately call your gas
supplier from a neighbor’s phone. Follow the gas supplier’s instructions. If you cannot reach your gas supplier, call the fire
department.
IMPORTANT
Consult and follow local Building and Fire Regulations and other Safety Codes that apply to this installation. Contact the local gas
utility company to authorize and inspect all gas and flue connections.
Installation and service must be performed by Camus Hydronics Limited qualified factory trained service technicians.
WARNING
Should overheating occur or the gas supply fails to shut off, DO NOT turn off or disconnect the electrical supply to the pump. Shut off
the gas supply at a location external to the appliance.
Boilers and water heaters are heat producing appliances. To avoid damage or injury, do not store materials against the
appliance or the vent-air intake system. Use proper care to avoid unnecessary contact (especially children) with the appliance
and vent-air intake components.
•Never cover your appliance, lean anything against it, store trash or debris near it, stand on it or in any way block the flow of fresh
air to your appliance.
•UNDER NO CIRCUMSTANCES may flammable materials such as gasoline or paint thinner be used or stored in the vicinity of
this appliance, vent-air intake system or any location from which fumes could reach the appliance or vent-air intake system.
•A gas appliance that draws combustion air from the equipment room where it is installed must have an adequate supply of fresh
air circulating around it during burner operation for proper gas combustion and proper venting.
1.5 CODES
The equipment shall be installed in accordance with those installation regulations enforced in the local area where the
installation is to be made. These shall be carefully followed in all cases. Authorities having jurisdiction shall be consulted before
installations are made. In the absence of such requirements, the installation shall conform to the latest edition of the National Fuel Gas
Code, ANSI Z223.1 and/or CAN/CGAB149 Installation Code. All electrical wiring must be done in accordance with the requirements of
the authority having jurisdiction or, in the absence of such requirements, with National Electrical Code, ANSI/NFPA70 and/or the Canadian
Electrical Code part 1 CSA C22.1. Where required by the authority having jurisdiction, the installation must conform to the American
Society of Mechanical Engineers Safety Code for Controls and Safety Devices for Automatically Fired Boiler, ANSI/ASME CSD-1. All
boilers conform to the latest edition of the ASME Boiler and Pressure Vessel Code, Section II & IV. Where required by the authority having
jurisdiction, the installation must comply with the CSA International, CAN/CGA-B149 and/or local codes. This appliance meets the safe
lighting performance criteria with the gas manifold and control assembly provided, as specified in the ANSI standards for gas-fired units,
ANSI Z21.13 & ANSI Z21.10
1.6 WARRANTY
•Factory warranty (shipped with unit) does not apply to units improperly installed or improperly operated.
•Factory warranty shall apply only when the appliance is installed in accordance with local plumbing and building codes,
ordinances and regulations, the printed instructions provided with it and good industry practices.

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•Excessive water hardness causing a lime build-up on the stainless steel tubes is not a fault of the appliance and is not covered
by warranty. Consult the factory for recommendations for use in hard water areas (See Water Treatment and Water Chemistry).
•Factory warranty does not apply to units damaged by using low water pressure (below 15 psi).
•Factory warranty does not apply to units damaged by using low water flow causing excessive temperature rise (above 60°F).
•Factory warranty does not apply to improper water/glycol mixture.
•Excessive cycling of the unit will reduce the life of the heat exchanger and its components. Factory warranty does not apply to
units damaged by using improper control parameters (such as PID) which cause excessive cycling of units.
•Using or storing corrosive chemicals in the vicinity of this appliance can rapidly degrade the stainless steel tubes and voids
warranty.
•Damage caused by freezing or dry firing voids warranty.
•This appliance is not to be used for temporary heating of buildings under construction.
•The manufacturer shall NOT be held liable for any personal injury or property damage due to ice formation or the dislodging of
ice from the vent system or the vent termination.
1.7 REMOVAL OF EXISTING APPLIANCE
When an existing appliance is removed from a common venting system, the common venting system is likely to be too large for proper
venting of the appliances remaining connected to it. At the time of removal of an existing appliance the following steps must be followed
with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining
connected to the common venting system are not in operation.
•Seal any unused opening in the common venting system.
•Visually inspect the venting system for proper size and horizontal pitch and determine that there is no blockage, restriction,
leakage, corrosion or other deficiency, which could cause an unsafe condition.
•Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining
connected to the common venting system are located and other spaces of the building. If applicable, turn on the clothes dryers
and any appliances not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom
exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
•Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so that the appliance
operates continuously.
•If provided, test for spillage at the draft control device relief opening after 5 minutes of main burner operation. Use a cold mirror,
the flame of a match, or candle or smoke from a cigarette.
•After it has been determined that each appliance remaining connected to the common venting system properly vents when
tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliance to their
previous condition of use.
•Any improper operation of the common venting system should be corrected so that the installation conforms to the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 and/or the Natural Gas and Propane Installation Code, CAN/CGA B149.1, Installation Codes.
When resizing any portion of the common venting system, the common venting system should be resized to approach the
minimum size as determined using the appropriate tables in Chapter 13 of the National Fuel Gas Code, ANSI Z223.1/NFPA 54
and/or the Natural Gas and Propane Installation Code, CAN/CGA B149.1, Installation Codes.
Heat exchanger surfaces and vent piping should be checked every six months for deterioration and carbon deposits. Remove all soot or
other obstructions from chimney and flue, which might impede draft action. Replace any damaged or deteriorated parts of the venting
system.
A qualified service technician should follow this procedure when inspecting and cleaning the heat exchanger and vent pipe.
1. Turn off electrical power and main gas shut-off and allow appliance to cool down.
2. Remove the vent pipe running to the chimney and check heat exchanger, vent and chimney for obstruction and clean as
necessary.
3. Remove burner from appliance and carefully clean as required. Never brush or wipe the knitted metal fiber surface – use a
garden hose and wash instead. Caution: Never use a pressure washer to clean the burner.
4. Use a pressure washer to clean heat exchanger, if necessary.
5. Reinstall parts removed in steps 2 and 3. Be sure that vent pipe has proper pitch and is properly sealed. Replace any damaged
gasket. Note that the burner is supplied with two gaskets; a high temperature graphite coated ceramic paper gasket under the
burner flange, and a stamped silicon gasket between the burner flange and fan flange. Tighten fan flange mounting nuts to 25
ft-lb (Models 1000-4000).
6. Restore electrical power and gas supply to appliance.
7. Place appliance in operation using lighting instructions provided.
8. Confirm proper operation of all safety devices.
9. Check for gas leaks and proper vent operation.
NOTE
Improper installation or system design, rather than faulty equipment, is the cause of most operating problems.

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1.8 BOILER ROOM OPERATING CONDITION
•Due to low jacket losses from the appliance, temperatures in a typical boiler room may drop significantly; supplemental heat is
required to maintain ambient temperature at acceptable levels.
•Camus Avenger boilers are required to be vented as a Category II or IV condensing appliance.
1.9 CLEARANCE FROM COMBUSTIBLE MATERIAL
This appliance is suitable for alcove (a closet without a door) installation with minimum clearances to combustibles as follows:
Table 1: Clearance from Combustibles
Clearance from Combustibles
TOP
12”
REAR
12”
SIDES
12”
VENT
1”
Figure 4: Clearance from Combustibles
The boiler must not be installed on carpeting.
Note: Clearances from combustible construction are noted on the appliance rating plate. Maintain minimum specified clearances for
adequate operation. All installations must allow sufficient space for servicing the vent connections, water pipe connections, circulating
pump, bypass piping and other auxiliary equipment, as well as the appliance.
Table 2: Servicing Clearances
Service Clearances
Model
Inches (cm)
Top*
Right Side
Left Side
Back
Front
1000
24” (60cm)
12” (30cm)
12” (30cm)
24” (60cm)
24” (60cm)
1500
24” (60cm)
12” (30cm)
12” (30cm)
24” (60cm)
24” (60cm)
2000
24” (60cm)
12” (30cm)
12” (30cm)
24” (60cm)
24” (60cm)
2500
24” (60cm)
12” (30cm)
12” (30cm)
24” (60cm)
24” (60cm)
3000
24” (60cm)
12” (30cm)
12” (30cm)
24” (60cm)
24” (60cm)
3500
24” (60cm)
12” (30cm)
12” (30cm)
24” (60cm)
24” (60cm)
4000
24” (60cm)
12” (30cm)
12” (30cm)
24” (60cm)
24” (60cm)
* 24” is recommended for service clearances on top. This clearance can also be reduced to 12” in more confined spaces, where it is difficult to leave 24”
clearance on top. In such situation, top panels and frames can be removed in order to service the blower assembly and burner assembly.

7
1.10 INSTALLATION PROCEDURE AND LOCATION OF UNIT
Install this appliance in a clean, dry location with adequate air supply.
•Do not locate this appliance in an area where it will be subject to freezing unless precautions are taken. Radiant losses from the
Avenger are minimal and should not be relied on to keep the appliance room warm.
•The appliance should be located close to a floor drain in an area where leakage from the appliance or connections will not result
in damage to the adjacent area or to lower floors in the structure. It is recommended that a suitable drain pan, adequately
drained, be installed under the unit. Under no circumstances is the manufacturer to be held responsible for water damage in
connection with this unit, or any of its components.
•If the appliance is installed above the level of the buildings radiation system, a Low Water Cut-Off device must be installed above
the heat exchanger inlet/outlet connections. Some local codes require the installation of a low water cut-off on all systems.
•When placing the appliance be aware that a minimum clearance of 24” must be provided at the front to allow easy access to the
heat exchanger.
•The appliance must be installed so that the ignition system components are protected from water (dripping, spraying, etc.) during
appliance operation and service (circulator replacement, control replacement, etc.)
•Appliances located in a residential garage or in adjacent spaces that open to the garage and are not part of the living space of
a dwelling unit, must be installed so that all burners and burner ignition devices have a minimum clearance of not less than 18”
(46 cm) above the floor. The appliance must be located or protected so that it is not subject to physical damage by a moving
vehicle.
•DO NOT install this appliance in any location where gasoline or flammable vapors are likely to be present.
•Appliance must be installed on a level floor. Maintain required clearances from combustible surfaces.
•Indoor models must be installed indoors where it is protected from exposure to wind, rain and weather.
•Outdoor models must be installed outdoors. For outdoor installations, always consider the use of a shelter such as a garden
shed to prevent direct exposure of the appliance. The additional protection afforded by the shelter will help to minimize nuisance
problems with electrical connections and will allow easier servicing of the appliance under severe weather conditions.

8
1.11 SPECIFICATIONS AND DIMENSIONAL DATA
Table 3: Appliance Dimensions and Specifications
Model
A
(in.)
B (in.) C (in.) D (in.) E (in.) F (in.) G (in.) H (in.) I (in.) J (in.) K (in.) *L (in)
COG
(A)
COG
(B)
1000
29 1/2
34
83
51 1/2
14 7/8
53 7/8
67 1/8
5
10 1/4
9 3/8
11 3/4
74 1/8
40
14.5
1500
29 1/2
38
83
52 3/8
14 7/8
54 1/2
68
3 1/2
10 7/8
8 1/8
10 1/2
74
38.5
15
2000
35
44
90
52 7/8
17 1/2
57 1/4
73 1/2
5 5/8
10
10 1/8
13 1/4
78 1/2
42
17.75
2500
35
44
90
52 7/8
17 1/2
57 1/4
73 1/2
5 5/8
10
10 1/8
13 1/4
78 1/2
42
17.75
3000
35
44
90
52 7/8
17 1/2
52 1/4
73 1/2
5 3/4
10 1/4
9
13
79 1/8
55
18.5
3500
35
44
99
53 3/8
17 1/2
60
77
5 1/2
10
8 1/2
16
83 1/2
43
18
4000
35
44
99
53 3/8
17 1/2
60
77
5 1/2
10
8 1/2
16
85 1/2
43
18
Model COG
(C)
M (in.) N (in.) P (in.) Qw
(in)
Qh
(in)
R (in.) *S (in.) T (in.) U (in.)
W (in.)
Ø Water
X (in.)
Ø Gas
Y (in) Ø
air
Weight
(lbs)
1000
13.5
3 7/8
16 7/8
18 7/8
24
74
33 1/4
18 1/2
3 1/2
5 3/8
2
1
8
1180
1500
15
4
17 7/8
19 3/8
24
74
36 1/2
20 1/2
3 1/2
5 3/8
2 1/2
1 1/4
10
1530
2000
17
4
20
24
28
81
42 1/2
23 1/4
3
5 3/8
3
1 1/4
12
2085
2500
17
4
20
24
28
81
42 1/2
23 1/4
3
7 5/16
3
1 1/2
12
2150
3000
20
4
20
24
28
81
42 1/2
24 1/8
3 1/2
7 5/16
3
1 1/2
12
2400
3500
17
6 1/2
20 1/2
24
27
90
42 1/2
24
4
7 5/16
4
2
12
2520
4000
17
6 1/2
20 1/2
24
27
90
42 1/2
24 1/2
4
7 5/16
4
2
12
2620
*Direct Vent/Sealed combustion option COG-Center of Gravity
Model
Required Ø for
up to 100 ft.
equiv. length for
Direct Venting
(in)
Vent connection
Ø, as shipped (in)
Required Category
IV, vent Ø up to
100 ft. equiv.
length (in)
Required Category II
vent Ø (in)
Blower air inlet Ø
(in)
AR(N,P)-1000
6
6
6
7
5 3/8
AR(N,P)-1500
6
8
7
8
5 3/8
AR(N,P)-2000
8
9
8
10
5 3/8
AR(N,P)-2500
8
9
9
10
7 5/16
AR(N,P)-3000
10
10
9
10
7 5/16
AR(N,P)-3500
10
10
10
12
7 5/16
AR(N,P)-4000
10
10
10
12
7 5/16

9
Table 3A: Input / Output
Model
Input MBH
Gross Output
MBH
Turn-Down
Max
Min
ARN-1000
1000
47
945
21:1
ARP-1000
1000
100
945
10:1
ARN-1500
1500
60
1,416
25:1
ARP-1500
1500
150
1,416
10:1
ARN-2000
2000
80
1,886
25:1
ARP-2000
2000
200
1,886
10:1
ARN-2500
2500
100
2,355
25:1
ARP-2500
2500
250
2,355
10:1
ARN-3000
3000
120
2,841
25:1
ARP-3000
3000
300
2,841
10:1
ARN-3500
3500
140
3,325
25:1
ARP-3500
3500
350
3,325
10:1
ARN-4000
4000
160
3,748
25:1
ARP-4000
4000
400
3,748
10:1
Table 3B: Water Content
Model
Volume (Gallon)
AR(N,P)-1000
55
AR(N,P)-1500
68
AR(N,P)-2000
96
AR(N,P)-2500
96
AR(N,P)-3000
107
AR(N,P)-3500
120
AR(N,P)-4000
120
Table 3C: Minimum Flow Rate at Maximum Fire Rate
Model
Flow (GPM)
AR(N,P)-1000
23.6
AR(N,P)-1500
35.4
AR(N,P)-2000
47.1
AR(N,P)-2500
58.8
AR(N,P)-3000
71.0
AR(N,P)-3500
83.1
AR(N,P)-4000
93.6
Based on maximum temperature rise of 80°F
Table 3D: Absolute Minimum Flow Rate
Model
Flow (GPM)
AR(N,P)-1000
7.9
AR(N,P)-1500
11.8
AR(N,P)-2000
15.7
AR(N,P)-2500
19.6
AR(N,P)-3000
23.7
AR(N,P)-3500
27.7
AR(N,P)-4000
31.2

10
PART 2 VENTING & AIR SUPPLY
DANGER
It is extremely important to follow these venting instructions carefully. Failure to do so can cause severe personal injury, death or
substantial property damage.
DANGER
Use of cellular core PVC (ASTM F891), cellular core CPVC or Radel® (polyphenosulfone) in venting systems is prohibited
2.1 GENERAL VENTING GUIDE
Figure 5: Venting Configurations
OUTDOOR VENTING STANDARD VENTING SIDEWALL VENTING AND
COMBUSTION AIR INLET
•The Avenger may be vented with manufactured prefabricated UL/ULC listed vents of AL29-4C or 316L stainless steel or with
plastic vent certified to UL/ULC S636, such as, IPEX System 636 CPVC or IPEX System 636 PP as permitted by local
jurisdictions.
•The Avenger boiler must be vented and supplied with combustion and ventilation air as described in this section. Ensure that
the venting and combustion air supply comply with these instructions regarding the vent system, air system, and combustion air
quality.
•Vent installations for connection to gas vents or chimneys must be in accordance with Part 7, “Venting of Equipment” of the
latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CAN/CGA Standard B149 Installation
Codes for Gas Burning Appliances and Equipment or applicable provisions of the local building codes.
•The distance of the vent terminal from adjacent building, windows that open and building openings MUST comply with the latest
edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CAN/CGA Standard B149 Installation Codes
for Gas Burning Appliances and Equipment.
•Vent connection is made directly to the flue outlet opening on the back of the unit.
•For indoor installations, venting must be in accordance with Part 7, Venting of Equipment, of the National Fuel Gas Code, ANSI
Z223.1, or Section 7, Venting of Equipment and Air Supply for Appliances, of the CAN/CGA B149, Installation Codes, or
applicable provisions of the local building codes.
•Horizontal runs of vent pipe shall be securely supported (approximately every 4 feet) to prevent sagging and maintain a minimum
upward slope of ¼” per foot from the appliance to the vent terminal.
•The weight of the venting system must not rest on the unit. Adequate support of the venting system must be provided in
compliance with local codes and other applicable codes.
•All connections should be secured and sealed per the vent manufacturer’s specifications. When a positive vent system is
disconnected for any reason, the flue must be reassembled and resealed according to the vent manufacturer’s instructions.
•Do not use an existing chimney as a raceway if another appliance or fireplace is vented though the chimney.
•This appliance shall not be connected to chimney flue serving a separate appliance, designed to burn solid fuel.

11
2.1.1 CATEGORY II AND CATEGORY IV VENTING
A Category II venting system operates with a negative pressure in the vent. A Category IV venting system operates with positive pressure
generated by the internal combustion air fan which operates the combustion process and exhausts the flue products from the building.
•The Category II flues from multiple appliances can be combined into a common vent. This special venting system must be
engineered by venting manufacturer and to be approved by local authority.
•The Category IV flues from multiple appliances CAN NOT be combined into a common vent.
•The Category IV flue must be a dedicated stack.
•The Category IV flue appliance must have all vent joints and seams sealed gas tight.
•The flue products in the vent system will be cooled below their dew point and will form condensate in the flue. Flue construction
must be of AL29-4C, 316L Stainless, S636 CPVC, S636 PPE.
•The flue from a Category II and IV vent system must have a condensate drain with provisions to properly collect, neutralize and
dispose of any condensate that may occur.
2.1.2 VENTING GUIDELINES FOR CATEGORY II AND/OR IV VENTING
•This installed length of the positive pressure flue from the appliance to the point of termination, outside of the building, must not
exceed a maximum of 100 equivalent feet (30.5 m) in length. Depending on diameter and centerline radius subtract from 7 to
19 feet per 90° elbow using published venting manufacturers data. Subtract half this value for each 45° elbow.
•The flue may terminate either vertically at the roof top or horizontally on a sidewall. See the information about the specific vent
termination location for recommended location and clearances.
•For direct vent applications, the maximum wall thickness must be between 0.5” – 12” (1.2 cm to 30 cm).
2.1.3 APPROVED VENTING MATERIALS
Exhaust Vent for Use for Avenger Category II or IV
Installations
1. Manufactured prefabricated UL/ULC listed vent of AL29-4C or equivalent, Single or Double wall.
2. 316L Stainless Steel is limited to use in applications where there is no possibility of contaminants in the air such as refrigerants,
chlorine etc.
3. “BH” type.
4. PVC Schedule 40 or 80 approved to ULC S636, for low temperature applications only when the flue gas temperature does not
exceed the “Maximum Flue Temperature” on Table 4.
5. CPVC Schedule 40 or 80 approved to ULC S636.
6. CPVC Schedule 40 approved to comply with ANSI/ASTM F441. (US Jurisdictions ONLY when permitted).
7. Polypropylene approved to comply with ULC S636 up to 12” diameter.
NOTE
1) Use of cellular core PVC (ASTM F891), cellular core CPVC or Radel® (polyphenosulfone) in venting systems is prohibited.
2) Covering non-metallic vent pipe and fittings with thermal insulation is prohibited.
Table 4: Maximum Flue Temperatures for Various Vent Materials
Vent Material
Maximum Flue Temperature (°F)
PVC
149
CPVC
194
Polypropylene
230
AL29-4C
300+, Limited only by rating of seals
316L Stainless Steel
300+, Limited only by rating of seals
Vent Material Selection
When selecting vent material, take into consideration that appliances installed near a corrosive or potentially corrosive air supply must be
isolated from it or they will suffer damage to the appliance and the venting system.
The corrosion resistance of AL29-4C is typically higher than that of 316L. Always choose the venting system which best satisfies the
requirements of the application.
This recommendation does not supersede local codes or the provision of the B149 in Canada or the National Fuel Gas Code in
the United States.

12
NOTE
Air Intake material must be of a type listed by a nationally recognized testing agency
1. PVC Non-Foam Core Pipe.
2. CPVC Non-Foam Core Pipe.
3. Polypropylene
4. ABS (Acrylonitrile-Butadiene-Styrene)
Single Wall air intake pipes are to be insulated 5 feet from wall toward the interior of the building to minimize external sweating.
2.1.4 VENT TERMINATION CLEARANCES
•Do not terminate the vent in a window well, stairwell, alcove, courtyard or other recessed area. The vent cannot terminate below
grade. The bottom of the vent terminal shall be located at least 12 inches (30 cm) above grade and above normal snow levels.
In all cases, the appliance shall be installed in accordance with local codes.
•The vent outlet MUST NOT terminate below a forced air inlet at any distance.
•The vent cannot terminate below grade. Position the vent termination where vapors will not damage walls or plants or may
otherwise be objectionable.
•The vent terminal shall not be installed closer than 3 feet (1 m) from an inside corner of an L-shaped structure, window well,
stairwell, alcove, courtyard or other recessed area as wind eddies could affect boiler performance or cause recirculation.
•DO NOT terminate closer than 4 feet (1.25 m) horizontally and vertically from any electric meter, gas meter, regulator, relief
valve, or other equipment. In all cases, local codes take precedence.
•Position terminations so they are not likely to be damaged by foreign objects or exposed to a build-up of debris.
•The vent piping must terminate in an elbow pointed outward or away from the air inlet.
•To avoid a blocked flue condition, keep the vent cap/terminal clear of snow, ice, leaves, debris etc.
•Flue gases from this appliance may contain large amounts of water vapor that will form a white plume in winter. Plume could
obstruct a window view.
•Flue gas condensate can freeze on exterior walls or on the vent cap. Frozen condensate on the vent cap can result in a blocked
flue condition. Some discoloration to exterior building surfaces can be expected. Adjacent brick or masonry surfaces should be
protected with a rust resistant sheet metal plate.
2.1.5 INLET CAP FOR ROOFTOP TERMINATION
The air inlet cap consists of two 90° elbows installed at the point of termination for the air inlet pipe. The first 90° elbow is installed on the
rooftop at the highest vertical point of the air inlet pipe and turned horizontal; the second 90° elbow is screened and is installed on the
horizontal outlet of the first elbow and turned down. A 90° elbow and a 90° street elbow may be used to make this assembly. If a straight
piece of pipe is used between the two elbows, it should not exceed 6” (150 mm) in length.
2.1.6 LOCATION OF A ROOFTOP AIR INLET AND VENT CAPS
•The point of termination for the combustion air inlet cap MUST be at least 3 feet (0.91 m) below the point of flue gas termination
(vent cap) if it is located within a 5 foot (1.5 m) radius of the flue outlet. Use care to ensure that the 90° elbow assembly is
properly installed on the air inlet pipe.
•The termination point of the combustion air inlet cap must be installed at least 3 feet (0.91 m) above the rooftop and above
normal snow levels.
•The vent cap assembly MUST be listed by nationally recognized agencies.
•The combustion air cap and vent cap MUST be located on the same roof top surface and in the same pressure zone.
•Combustion air supplied from outdoors must be free of contaminants. To prevent recirculation of flue products into the
combustion air inlet, follow all instructions in this section.
•Incorrect installation and/or location of the air inlet cap can allow flue products to be drawn back into the appliance. This can
result in incomplete combustion and potentially hazardous levels of carbon monoxide in the flue products. This will cause
operational problems with the appliance and if left uncorrected, will lead to conditions that can cause personal injury or death.
Figure 6: Vertical Direct Venting Configuration
Vent
Air Intake
Air inlet must
be 36” min.
below vent
opening

13
2.1.7 AIR INLET DAMPER
In cold climates, it is essential to provide a motorized air Inlet Damper to control the supply of combustion air and prevent nuisance
condensation. Each air Inlet Damper is designed to serve only one appliance and it must be electrically wired to the Air Inlet Damper
Connection inside the junction box. All electrical wiring must be done in accordance with the requirements of the authority having
jurisdiction or, in the absence of such requirements, with National Electrical Code, ANSI/NFPA70 and/or the Canadian Electrical Code
part 1 CSA C22.1. A minimum clearance of not less than 6” (152 mm) between the air Inlet Damper and combustible construction must
be maintained for service of the vent damper device.
Figure 7: Air Inlet Damper Connection inside J-Box
NOTE
Damper must be in open position when appliance main burner is operating.
2.1.8 MASONRY CHIMNEY INSULATIONS
Always follow local codes when venting this appliance into a masonry chimney. A standard masonry chimney must NOT be used to vent
the products of combustion from the flue of a condensing, positive or negative pressure appliance (Category II or IV). If a masonry chimney
is to be used, the chimney MUST use a sealed, corrosion resistant liner system to vent flue products from this high efficiency appliance.
Sealed, metallic, corrosion resistant liner systems (AL29-4C or equivalent, single wall or double wall, or flexible or rigid metallic liners)
must be rated for use with a high efficiency condensing, positive pressure vent system. Corrosion resistant chimney liner systems are
typically made from a high grade of corrosion resistant stainless steel such as AL29-4C or equivalent. The corrosion resistant liner must
be properly sized and fully sealed throughout the entire length. If the flue is contained within the masonry chimney, both the top and the
bottom of the masonry chimney must be capped and sealed to provide a dead air space around the sealed corrosion resistant liner.
Consult with local code officials to determine code requirements or the advisability of using a masonry chimney with a sealed
corrosion resistant liner system.
2.1.9 VERTICAL VENTING TERMINATION
•Follow Category II or IV vent termination and all General Instructions.
•The vent terminal should be vertical and exhaust outside the building at least 2 feet (0.61 m) above the highest point of the roof
within 10 feet (3.05 m) radius of the termination.
•The vertical termination must be a minimum of 3 feet (0.91 m) above the point of exit.
•A vertical termination less than 10 feet (3.05 m) from a parapet wall must be a minimum of 2 feet (0.61 m) higher than the parapet
wall.
2.1.10 COMBINED COMBUSTION AIR INLET
The air inlet pipes from multiple appliances can be combined to a single common connection if the common air inlet pipe has a cross
sectional area equal to or larger than the total area of all air inlet pipes connected to the common air inlet pipe.
Equivalent pipe diameter = Sq Root [(d1)2+ (d2)2+ (d3)2+ (d4)2+ ... + (dn)2], d, pipe diameter
•Example: What is equivalent pipe diameter of three air inlet pipes, 8” (20.3 cm), 10” (25.4 cm) and 12” (30.5 cm)
oEquivalent pipe diameter = Sq Root [(8)2+ (10)2+ (12)2] = Sq Root (308) = 17.5”, Select 18” (82.8 cm) diameter pipe
or larger.
The air inlet point for multiple boiler air inlets must be provided with an exterior opening which has a free area equal to or greater than
the total area of all air inlet pipes connected to the common air inlet. This exterior opening for combustion air must connect directly to the
outdoors. The total length of the combined air inlet pipe must not exceed a maximum of 100 equivalent feet (30.5 m). You must deduct
the restriction in area provided by any screens, grills or louvers installed in the common air inlet point. Screens, grills or louvers installed
in the common air inlet can reduce the free area of the opening from 25% to 75% based on the materials used. Calculate and compensate
accordingly for the restriction.

14
2.1.11 DRAIN TEE
Figure 8: Drain “T” and Neutralizer Cartridge Installation
A drain line must be connected to the boiler condensate drain and to a tee installed in the vent pipe to collect and dispose of any
condensate that may occur in the boiler and vent system. The drain tee should be installed at the point where the flue turns vertical for a
roof top termination or as one of the first fittings in a horizontal flue that will terminate on a sidewall. Ensure that horizontal portions of the
vent are properly sloped away from the appliance to allow condensate to be evacuated at the drain tee. Plastic drain tubing, sized per
the vent manufacturer’s instructions, shall be provided as a drain line from the tee and from the boiler condensate line. The drain tubing
from the tee must have a trap provided by a 4” (10 cm) diameter circular trap loop in the drain tubing and the boiler drain shall be normal
with no loop and tied into the tee drain tubing with a tee at a point after the 4” loop and before the neutralizer. Prime the trap loop by
pouring a small quantity of water into the drain hose before assembly to the vent. Secure the trap loop in position with nylon ties. Use
caution not to collapse or restrict the condensate drain line with the nylon wire ties. The common condensate drain must be routed to the
condensate neutralization system or a suitable drain for the disposal of condensate that occurs in both the boiler and in the vent system.
Ensure that the drain from the condensate tee is not exposed to freezing temperature.

15
2.2 CONVENTIONAL VENTING (INDOOR) INSTALLATIONS
•The Avenger is approved as a category II appliance and is approved for venting into a common chimney. On single appliance
installations with dedicated chimney, if drafts are excessive (above negative 0.15 inches W.C.), a single acting barometric
damper is recommended.
•A qualified professional using a proven vent-sizing program with input of accurate operating parameters must properly determine
sizing of the venting system. In applications where flue gas temperatures are lower than can support a Category II with
conventional negative draft, it will be determined at the venting design stage that a positive pressure will be developed in the
vent. It will then be necessary to either provide separate vents as for Category IV, pressurize the room or to provide an extractor
at the chimney outlet interlocked with the appliance operating circuit in order to maintain a negative draft in the chimney and
allow common venting.
•Approval of the installation will be at the discretion of authorities having jurisdiction.
IN GENERAL
•The operation of exhaust fans, compressors, air handling units etc. can take away air from the room, creating a negative pressure
condition leading to reversal of the natural draft action of the venting system. Under these circumstances, an engineered air
supply is necessary.
•If the appliance is to be installed near a corrosive or potentially corrosive air supply, the appliance must be isolated from it and
outside air should be supplied as per code.
•Potentially corrosive atmospheres will result from exposure to permanent wave solution, chlorinated waxes and cleaners,
chlorine, water softening chemicals, carbon tetrachloride, halogen based refrigerants, Freon cleaning solvents, hydrochloric
acid, cements and glues, masonry washing materials, antistatic fabric softeners, dry cleaning solvents, degreasing liquids,
printing inks, paint removers, etc.
•The equipment room MUST be provided with properly sized openings to assure adequate combustion air and proper ventilation
when the unit is installed with a proper venting system.
2.2.1 AIR REQUIRED FOR COMBUSTION AND VENTILATION
If air is taken directly from outside the building with no duct, provide two permanent openings:
a) Net free area for combustion air opening shall be in accordance with all applicable codes. In the absence of such codes, provide
combustion air opening with a minimum free area of one square inch per 30,000 Btuh input (1.3 cm per kW) of the total rated
input of the power burner. This opening must be ducted no higher than 18” nor less than 6” above the floor. Provide a ventilation
air opening located as high as practical in the room sized no less than 10% of the air supply opening.
b) Provision for combustion and ventilation must be in accordance with:
•Applicable sections of The National Fuel Gas Code ANSI Z223.1
•Applicable sections of CAN/CGA B149 installation codes
•Applicable provisions of the local building codes
NOTE
Outside air openings shall directly communicate with the outdoors
CAUTION
Under no circumstances should the mechanical room ever be under a negative pressure. Particular care should be taken where
exhaust fan, attic fans, clothes dryers, compressors, air handling units, etc., may take away air from the unit.
2.2.2 EXHAUST FANS
Any fan or equipment which exhausts air from the equipment room may deplete the combustion air supply and/or cause a downdraft in
the venting system through a barometric damper if installed. Spillage of flue products from the venting system into an occupied living
space can cause a very hazardous condition that must be immediately corrected.
2.3 OUTDOOR VENTING (Pending)
The Avenger windproof cabinet protects the unit from weather, when fitted with the factory supplied air intake and UL approved vent cap
(93.0298), it will be self-venting and suitable for outdoor installation.
1. Outdoor models must be installed outdoors and must use the air intake and vent cap supplied by Camus Hydronics.
2. Periodically check to ensure that air intake and vent cap are not obstructed.
3. Locate appliance at least 3 feet away from any overhang.
4. Locate appliance at least 10 feet away from building air intake.
5. Avoid installation in areas where runoff from adjacent building can spill onto appliance.
For outdoor installations, always consider the use of shelter such as a garden shed to prevent direct exposure of the appliance to the
elements. The additional protection afforded by the shelter will help to minimize nuisance problems with electrical connections and will
allow easier servicing of the appliance under severe weather conditions.