Lifebreath CAF-02-MB, Clean Air Furnace CAF-02-MB User Manual

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Models: CAF-U-S4A-24-P16(E16), CAF-D-S4A-24-P16(E16), CAF-H-S4A-24-P16(E16), CAF-U-L4A-36-P16(E16),

CAF-D-L4A-36-P16(E16), CAF-H-L4A-36-P16(E16), CAF-U-L2A-48-P16(E16), CAF-U-00-36-P16(E16), CAF-U-00-48-P16(E16)

Operation, Sizing and Installation Manual

Hydronic Models with Built-in

Heat Recovery Ventilator (HRV)

MANUFACTURED WITH

AIRCOM ELECTRONICS

CAF-02-MB

0707

CAUTION

It is always important to assess how the operation of any HRV/ERV may interact with vented combustion equipment (ie. Gas Furnaces, Oil Furnaces, Wood Stoves, etc.).

CAUTION

Never install an HRV/ERV in a situation where its normal operation, lack of operation or partial failure may result in the backdrafting or improper functioning of vented combustion equipment!

Table of Contents

 

Introduction.......................................................................

3

Overview of the CAF........................................................

3

Description and Purpose..................................................

4

Operation Heating/Cooling...............................................

4

The Recovery Core ...........................................................

5

Combo System Basic Principle.........................................

6

Plumbing......................................................................

7-13

Installation.................................................................

14-16

Pitot Tube Air Flow Balancing..................................

17-18

Function and Controls ...............................................

19-20

Optional Remote Control Devices..................................

21

Wiring the Controls.........................................................

22

Aircom Relays ................................................................

23

Service and Maintenance................................................

25

Troubleshooting.........................................................

26-27

Model Number Nomenclature Breakdown.....................

28

Specifications ............................................................

29-37

System Commissioning ..................................................

38

Work Sheets...............................................................

39-44

Wiring Diagrams .......................................................

45-46

Leave this manual for the homeowner!

TO BE COMPLETED BY CONTRACTOR AFTER INSTALLATION

Installing Contractor

Telephone / Contact

Serial Number

Installation Date

Model

2

Introduction

You will notice that the heated air in your home feels more comfortable than air heated by a conventional furnace. One reason for this is that LIFEBREATH's hydronically heated air is uniform and temperate... no short blasts of hot air or hot and cold temperature spikes. The air flowing from your hot air vents will not feel as hot to the touch as air from a conventional furnace.

With a high efficiency, adequately sized natural gas, propane or oil hot water heater/boiler, you will always have plenty of hot water for showers and baths, washing dishes and clothes, and all other normal domestic hot water needs. If there is an unusually high demand for hot water, such as filling a large hot tub, then all you need to do is allow more time for the task so the water heater/boiler can keep up to its job of providing hot water for the heating system as well as other household uses.

Once it is correctly installed, safety will never be an issue with your LIFEBREATH furnace. No flames, fumes or flue gases to be concerned about. Your domestic hot water heater/boiler now provides the heat source for your furnace.

This Operation and Installation Guide will help you learn about your LIFEBREATH Clean Air Furnace quickly and easily. The table of contents will show you where to find information on every feature of this unit along with easy to understand operating instructions. If, however, you do encounter a question that is not covered in this Guide you should call the LIFEBREATH dealer who installed your furnace. Chances are that he will be able to give you a satisfactory answer but if he is unable to do so then we invite you to contact us directly.

Nutech Brands Inc.

Overview of the Clean Air Furnace

Hydronic Coil

and Pump

Compartment

Recovery Core

and Ventilation

Compartment

Aircom

Electronics

and Fan

Compartment

3

Description and Purpose

IMPORTANT NOTE

The purpose of this manual is to act as an installation guide only for the LIFEBREATH Clean Air Furnace. Manufacturers' instructions for other components, such as the waterheater/boiler, must be followed.

All national and local code requirements must be met when installing a LIFEBREATH Clean Air Furnace. Be sure to consult the proper authorities.

Note: Temperatures greater than 130°F (54°C) pose a serious risk of scalding individuals running domestic hot water for potable use.

This appliance complies with IAS Canada Inc. Requirement CR95-003, Additional Require-ments for Fan Coil Units for use with Potable Water Heaters.

All piping and components connected to this appliance shall be suitable for use with potable water.

Toxic chemicals, such as used for boiler treatment, shall not be introduced into the potable water heater system.

When using this system and the hot water for space heating is set to a higher temperature than for other uses, an antiscald valve shall be used to ensure water for common use is reduced in temperature to minimize a scalding hazard.

Combining two or more end uses such as space heating and the heating of domestic hot water in a single system has the potential to increase efficiency and reduce overall capital costs. However, the proper design, installation, and commissioning of these systems are critical if these advantages are to be realized.

This manual provides a guideline of good engineering practice in the design, installation and commissioning of Integrated Combo Systems. The guidelines in the manual are designed for residential forced warm air Integrated Combo Systems which utilize domestic water heaters or boilers and the LIFEBREATH furnace. Heating and cooling loads shall be calculated in accordance with recognized Residential Heat Loss and Heat Gain Calculation methods. Duct design shall comply with recognized Residential Air System Design methods. This manual provides worksheets to be used for the purpose of sizing residential water heaters and the combo furnace.

The LIFEBREATH Clean Air Furnace is a volume ventilation system. Use the optional Lifebreath Bathroom Exhaust System Kit (Part 99-CAF-BESKIT) if you wish to exhaust from specific locations such as bathrooms.

Operation Heating/Cooling

When the room thermostat calls for heat, it activates a circulation pump located inside the Clean Air Furnace. This pump delivers hot water from the water heater, through the furnace coil and back to the water tank. Simultaneously, the furnace blower switches on to high speed and will start circulating air across the coil, which picks up heat and delivers it to the rest of your home.

Once the thermostat's temperature is reached the pump will shut off, and the blower will return to its pre-set speed or off.

Note: When the furnace blower is left running on low speed the air in the home circulates continuously. When the heat is called for the blower will automatically switch to a higher speed. After the required hot air has been delivered the blower will switch back to low speed.

When the thermostat calls for cooling (evaporator coil and condensing unit required), the furnace blower activates to high speed and the outdoor condenser unit is energized. After the thermostat temperature is reached, the condensing unit will shut off and the blower will return to its preset speed or off.

Ventilation

The heat recovery ventilation (HRV) portion of the Clean Air Furnace, is automatic. Once set, a desired amount of fresh air will be drawn into the home while the furnace blower is activated.

To reduce humidity, increased ventilation may be required during heating season. An optional remote dehumidistat can be installed. The dehumidistat will increase the speed of the furnace blower to high and will return to its original setting when humidity levels decrease. Your dehumidistat must be switched off during warmer months. A quality humidifier should be added if you wish to increase winter humidity levels

Typically the air flow for ventilation will be set to 50 - 70cfm, for low speed furnace operation, and 100 - 150cfm at high speed. The pleated furnace filter should be checked regularly and replaced as needed. The HRV filter should be washed twice a year or more often if needed.

Off Season Circulation Timer

All models are equipped with a circulation timer. It is normal operation for these models to automatically run the circulation pump intermittently for a short period of time.

4

The Recovery Core

HRV - Aluminum Core

A Heat Recovery Ventilator (HRV) is designed to provide fresh air into a building while exhausting an equal amount of stale air. During the winter months, the incoming cold fresh air is warmed by utilizing the heat recovered from the stale air before it is exhausted to the outdoors. During summer months when the indoor space is air conditioned, the Heat Recovery Ventilator will help in cooling the incoming fresh air with the stale air that is being exhausted.

Stale Air from Building

Fresh Air to Building

ERV - Enthalpic Paper Core

An Energy Recovery Ventilator (ERV) is designed to provide fresh air into a building while exhausting an equal amount of stale air. An ERV is designed for use in warm humid areas with heavy air conditioning use. The ERV will transfer both sensible and latent heat from the incoming fresh air to the outgoing stale air thereby reducing the load (due to ventilation) on the air conditioning system.

ATTENTION

The ERV - Enthalpic Core is not suitable for climates where the outdoor temperature drops below -4°C (25°F).

Fresh

Outdoor Air

Stale Air to Outside

5

Combo System Basic Principles

Open and Closed Systems

Open and Closed systems both deliver hot water and space heating.

Water systems that incorporate a pressure tank (i.e. well systems) are normally Open Systems and most municipal water systems are Closed Systems.

ATTENTION

Check valves should always be installed in a vertical rise with the flow of water shown.

Closed Loop System

A system becomes closed when a Check Valve or a backflow prevention valve is installed in the cold water piping upstream of the water heater.

A check valve will prevent water being relieved into the cold water system due to pressure created when water is heated in the water heater.

Drain Valve

A drain valve is required to allow the heating loop to be drained for service or repair and to remove air from the heating loop when commissioning a system. The drain valve should be near the low point of the return piping system to be near the water heater. Ball, Globe or Gate Valves are suitable for drain valves.

IMPORTANT

Refer to local codes, local bylaws and installation manuals supplied with water heater before starting any installation work.

This Check Valve minimizes Thermo-Siphoning. Thermo Siphoning is the cold water backflowing through the heating loop when domestic hot water is called for.

COLD WATER INLET

DOMESTIC HOT WATER

 

CHECK

 

 

 

VALVE

 

 

Conventional

VALVE

 

 

Cooling

 

SUPPLY AIR

(Not available

(shut off)

ANTI-SCALD VALVE

COOLING COIL

 

 

through(OPTIONAL)

EXPANSION TANK

(WHEN REQUIRED)

 

Nutech)

 

VALVE

OR OTHER MEANS

 

(shut off)

 

(WHEN REQUIRED)

 

 

 

 

 

 

RETURN AIR

 

VALVE

VALVE

 

 

(shut off)

(balancing)

 

CHECK

VALVE

WATER HEATER

HEATING COIL

HRV/ERV CORE

DRAIN

VALVE

BLOWER

6

Plumbing

In order to improve serviceability of our products, the check valve is included with our manual kit for field installation between the air-handler and hot water source.

The check valve should be installed in a vertical run of pipe with the flow of water in an upward direction.

An arrow on the check valve indicates its correct orientation and must match the direction of water flow.

This will allow for ease of service to remove any installation debris or service required due to extended hard water conditions.

Note: Take care during soldering to avoid debris or solder from lodging in the check valve.

Note: It is critical to follow the piping configuration shown. Maintain a minimum distance of 12” above the CAF/AH. This will minimize thermal siphoning in the combo system.

Figure 1

To

House

Min. 12" (305 mm)above

12"

top of CAF / AH

Check

 

Valve

 

Water

CAF

Heater

or

 

AH

Figure 2

To

 

House

Min. 12" (305 mm)

 

12" above top of CAF / AH

 

Check

Water

Valve

CAF

Heater

or

 

AH

* It should be noted that problems have been observed when using the side

tappings on certain water heaters; therefore, it is strongly recommended to use the top water tappings as indicated in Figure 1 to minimize thermal siphoning and related issues.

7

Plumbing

Expansion Tanks

Expansion tanks are required in addition to a Check Valve for Closed Systems because pressure is created when water is heated in the water heater.

The expansion tank has an air bladder which will contract to relieve pressure in the system. The tank should always be connected to the cold water piping between the water heater shut off valve and the cold water inlet to the water heater.

Anti-Scald Valve

An anti-scald valve is required when the water heater thermostat is set above 140°F (60°C). Also, an anti-scald valve may be required for all installations by the “authority having jurisdiction”. The valve is placed in the hot water supply piping from the water heater downstream of the heating loop connection and upstream of any domestic hot water connection.

The purpose of the valve is to limit the maximum temperature available for domestic hot water by mixing hot water from the water heater with cold water from the municipal supply.

The Anti-Scald valve must be thermostatically controlled and approved to the ASSE standard No. 1016 and 1017 for use as an anti-scald device.

Time to Scald

(1st degree burns)

Temperature

Time

 

 

120°F

8 min.

 

 

130°F

20 sec.

 

 

140°F

3 sec.

 

 

160°F

<1 sec.

 

 

Closed Loop System

 

 

 

COLD WATER INLET

DOMESTIC HOT WATER

 

CHECK

 

 

 

VALVE

 

 

 

 

 

 

Conventional

(shut

 

SUPPLY AIR

Cooling

 

ANTI-SCALD VALVE

COOLING COIL

 

 

(OPTIONAL)

EXPANSION TANK

(WHEN REQUIRED)

 

(Not available

 

VALVE

through Nutech)

OR OTHER MEANS

 

(shut off)

 

(WHEN REQUIRED)

 

 

 

 

 

 

RETURN AIR

 

VALVE

VALVE

 

 

(shut off)

(balancing)

 

CHECK

VALVE

WATER HEATER

HEATING COIL

HRV/ERV CORE

DRAIN

VALVE

BLOWER

8

Plumbing

Valves

(a)Located on the cold water side of the Heater.

This valve has the ability to isolate the hot water (domestic and space heating) from the household cold water supply. Every water heater requires this valve regardless of space heating use.

(b)Located on the hot water supply side of the heating loop, downstream of its connection to the domestic water.

(c)Located on the return side of the heating loop upstream of its connection to the domestic cold water.

Ball Valve

(a)

Supply

 

 

(b)

 

(c)

 

Return

HC

Globe Valve

These two valves isolate the heating loop for service or repair.

The Ball Valve can be used as a shut off or drain valve. When in the open position, a full bore ball valve has very little resistance to flow, and these valves tend to be both the least expensive and the least susceptible to seizing over time. Do not use reduced bore ball valves as they are very restrictive to water flow.

Gate Valve

The Gate Valve can be used as a shut off or drain valve. When in the open position, there is very little resistance to flow. Gate valves tend to be less expensive than other types of valves but are susceptible to chatter (noise) and malfunction with age.

The Globe valve can be used as a shut off, drain or throttling valve. Even in the open position, the valve is fairly restrictive to flow. It has a much greater equivalent length (resistance.) than the other types of valves.

Balancing (Throttling) Valve

The Balancing (Throttling) Valve is used to reduce the water flow rate and thereby increase the water temperature drop. This is done to ensure proper activation of the water heater thermostat.

A Globe Valve could also be used for Balancing (Throttling) but has more resistance than the Balancing Valve.

9

Plumbing

Call for Space Heating

There are two thermostats controlling every combo system, the water heater thermostat (controlling the hot water temperature) and the room thermostat (controlling the room air temperature).

When the room thermostat calls for heat, the circulation pump is activated. Hot water is then drawn from the top of the water heater through the air handler, and then returned to the water heater.

Open Loop System

 

 

 

COLD WATER INLET

DOMESTIC HOT WATER

 

 

 

 

 

Conventional

VALVE

 

 

Cooling

 

 

(Not available

(shut off)

 

SUPPLY AIR

ANTI-SCALD VALVE

COOLING COIL

 

 

through(OPTIONAL)

 

(WHEN REQUIRED)

 

Nutech)

 

VALVE

 

 

(shut off)

 

 

 

 

 

RETURN AIR

 

VALVE

VALVE

 

 

(shut off)

(balancing)

 

CHECK

VALVE

WATER HEATER

HEATING COIL

HRV/ERV CORE

DRAIN

VALVE

BLOWER

Hot Water Temperature Drop

The water heater thermostat will initiate the water heater as required as long as there is a 20°F (11°C) temperature drop between the hot water supplied to the air handler and the returning water.

A temperature drop less than 20°F (11°C) can cause the water heater thermostat not to initiate. This will result in a lower hot water supply temperature or poor space heating performance with fluctuating domestic water temperatures.

Call for Domestic Hot Water and Space Heating

When both return water from the space heating loop and new cold water (replacing domestic water being used) enters the water heater, the mixed entering water is cool enough to activate the thermostat quickly. In this situation, the water heater must be capable of satisfying the combined need for domestic hot water and and space heating at the same time.

ATTENTION

Plumbing components and system configuration may vary from diagrams portrayed.

ATTENTION

Chemicals (such as boiler system additives) cannot be added to a domestic hot water system.

10

Plumbing

Air System

A circulation fan draws cool house air at approx. 70°F (21°C) from the return ductwork, forces it through the water coil where it is heated, and then distributes it to the various rooms of the house through the supply ductwork.

Water System Pressures

Within the water system of an Integrated Combo system, there are three terms that the designer/installer must understand.

1.Hot water supply temperature (EWT)

2.Hot water flow rate (GPM)

3.Air handler return temperature

4.Air handler flow rate (CFM)

Head Pressure

Head pressure is the pressure created by the circulation pump to push water through the piping system. It is this pressure which is used to overcome the resistance to water flow (friction) caused by the water pipe and fittings. It is similar in concept to the external static pressure in an air duct system. Head pressure is measured in feet of water (millimeters of water).

NOTE

The vertical height of the heating loop does not impact on the head pressure as the pressure required to push the water up the vertical height is offset by the weight of the water in the vertical drop on the other side of the heating loop.

Water Flow Rate

Water flow rate is the amount of water flowing in the system. It is directly related to the head pressure and the resistance to flow. Flow rate is measured in gallons per minute (liters per minute).

The circulation pump is factory installed within the air handler. The water flow rate will vary depending on the pumps performance and the head pressure (resistance) of the complete heating loop system.

The piping and fittings used to connect the water heater and air handler must be sized to handle the volume of hot water required by the air handler within the pressure limitations of the circulation pump. All piping, fittings solders, and fluxes must be acceptable for use with domestic hot water.

Pressure Drop (PD)

Pressure drop (PD) is the reduction in total pressure caused by components added to a piping system such as coils, valves, and fittings. The measurement of pressure drop is the difference in pressure on the inlet side of the component and the outlet side. Pressure drop is measured in feet of water (millimeters of water).

When connecting the water lines for heating loop (air handler) to the domestic water system, the pipes should be connected with a “tee” to the side of a vertical domestic water pipe or the bottom of a horizontal domestic water pipe. This is to help prevent air from entering the heating loop. The connections should be as near as practical to the water heater.

Water Pump Performance Specifications

S2 and S4 Models

 

16

 

14

Feet

12

10

in

 

Head

8

Total

6

 

4

2

0

1

2

4

6

8

10

12

Capacity on U.S. gpm

L2 and L4 Models

 

16

 

14

Feet

12

10

in

 

Head

8

Total

6

 

4

 

2

 

0

1

2

4

6

8

10

12

14

16

18

20

Capacity on U.S. gpm

11

Plumbing

Air Handler Output Capacity

There are four factors that will significantly affect the heating output of the air handler.

They are:

Hot water supply temperature (EWT)

Hot water flow rate (GPM)

Air Handler return air temperature

Air Handler air flow rate (CFM)

Hot Water Supply Temperature

The hot water supply temperature is controlled by the water heater thermostat. This is set by the installing contractor to provide the required temperature at the hot water outlet of the water heater.

The hot water supply temperature is typically 140°F (60°C). If this temperature must be increased to achieve higher outputs from the furnace an anti-scald valve must be used to prevent domestic hot water temperatures above 140°F (60°C). The manufacturer of the Hot water Tank should be consulted for temperatures higher than 140°F.

It is important that a warning label be placed near the water heater thermostat telling the homeowner not to change the thermostat setting. The label is included with the furnace.

Hot Water Flow Rate

The hot water entering the water coil is the source of heat to the air handler. The effect of changing the amount of water entering the coil is the same as changing the water temperature. As water flow is reduced, the output of the air handler and the air temperature rise will both be lowered.

Air Handler Return Air Temperature

The return air temperature entering the air handler is approx. 60°F (33°C) below the hot water inlet temperature. If the return air temperature entering the air handler is reduced, more heat transfer will occur and the output of the air handler will increase.

NOTE

Although the water in the combo system is pressurized by the domestic water system the pump is required to create water flow in the heating loop. The domestic water system applies the same pressure to the supply and return sides of heating loop.

Air Handler Air Flow Rate

The air entering the air handler can only be warmed by the temperature difference between the hot water and the cool air. As the volume (CFM (L/s)) of air is reduced, the amount of heat which can be transferred is also reduced.

Air Handler Temperature Rise

In a fuel fired furnace, the combustion gases can be 1000°F (538°C) above the return air temperature. These units typically have a temperature rise from 50°F (10°C) to 90°F (32°C) and therefore delivers air at the diffuser at 120°F (49°C) to 160°F (71°C).

With an Integrated Combo System, the hot water temperature is approx. 130°F (54°C) which is 60°F (15.5°C) above the return air temperature. These units typically have a temperature rise of 35°F (2°C) to 40°F (4°C) and therefore would deliver air at the diffuser at approximately 105°F (40.5°C) to 110°F (43°C).

Room Thermostat

The room thermostat controls both the water circulation pump and the air circulation fan. It should be on a centrally located, inside wall away from any source of heat such as diffusers, appliances and direct sunlight.

Energy Saving Room Thermostat

A set back thermostat or “smart stat” can be used with a combo system, but care must be taken in the timing of the temperature changes. The timing of morning warm up should be early enough that the desired air temperature has been reached before the people begin to use domestic hot water. The highest demand for space heating is during the morning warm up and the highest demand for domestic hot water is during morning showers. Even if the water heater is properly sized, it may not be able to meet this combined load. Therefore, large set backs should be avoided.

Design vs. Field Conditions

The factors discussed between design parameters and actual field conditions can impact greatly on output capacity. Therefore, it is important to do a thorough and complete commissioning of the integrated combo system to ensure the design parameters are met.

12

Plumbing

Drain Line

The ventilation portion of the Clean Air Furnace has two drain pans for removing condensation, which may occur on the heat recovery core during cold weather.

Piping

The hot water piping between the hot water tank and the Clean Air Furnace should be new copper type, and should not be treated with chemicals, sealant or anything else, that will interfere with the purity of the potable water. Only nonlead, low temperature solder is permitted for sealing copper joints.

Where possible the length of pipe should not exceed 200' total equivalent length. Any piping running through unconditioned space must be insulated to prevent heat loss, and possible freezing of the line.

Look inside the furnace and locate the pump. Attach the "Hot Water In" (Supply) to the pipe running to the pump. Attach the "Hot Water Out" (Return) to the pipe running to the coil. Do not reverse these lines, as this will cause the unit to malfunction.

For piping conventional water heaters, connections to and from the Clean Air Furnace to the water tank should be made at the point where the pipes leave the tank vertically. A "T" fitting used in each vertical line, with the Clean Air Furnace piping connected to the horizontal side of this fitting, will work best in avoiding air locks in the circulation pump of the furnace.

*Note: Remove shipping block from underneath pump and discard.

HRV Drain Line Diagram

 

DRAIN

2” (50 mm)

DRAIN

 

SPOUT

 

 

 

 

SPOUT

 

 

 

KNOCKOUT

TAPE

 

KNOCKOUT

 

TEE

 

 

 

 

 

 

CONNECTOR

 

 

 

THROUGH KNOCKOUT

 

 

 

TO DRAIN

 

13

Installation

This manual gives the contractor guidelines for installing the LIFEBREATH Clean Air Furnace. All national and local codes relating to this type of equipment must be followed.

Locating The Unit

The Clean Air Furnace is designed to be installed vertically, (unless it is designated as a Horizontal unit ”H”), in a conditioned space, where the surrounding temperature does not fall below 50°F (10°C). Attic installations are not recommended. Typically the unit is installed in a mechanical area of the basement, or other partitioned mechanical room, elsewhere in the home.

A location close to an outside wall is recommended, as the ventilation supply and exhaust portion will need to be ducted to the outside air. Sufficient clearance around the unit is required for service of the filter, heat recovery core and components. As a rule this unit should be installed adjacent to the hot water heater. If this is not possible, or if the piping layout is complex, the total head pressure on the pump should be calculated.

Duct Connections

To accommodate various installations, the Clean Air Furnace has knockouts for the return air plenum and ventilation ducts, on both sides of the cabinet. Special care and attention should be given to determining which knockouts are to be removed.

Slide Heat Recovery Core out to remove ventilation knockouts. Never install ductwork directly to the cabinet that is smaller than the opening provided.

Penetrations from sheet metal screws used to fasten the ductwork to the cabinet of the unit should only be placed into the duct flange provided. This is to avoid contact and damage of the heating/air conditioning coils and internal wiring.

Option 1 - Upflow Models

Ventilation Ports Off Left

Ventilation Ports Off Right

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Remove circular

Remove circular

metal knockout

metal knockout

 

Remove

Remove

 

 

styrofoam

styrofoam

 

 

knockout

knockout

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE: Return plenum opening can be on either side of cabinet and is not dependent on which side the ventilation ports are on.

14

Installation

Option 2 - Downflow Models

Ventilation Ports Off Left

Ventilation Ports Off Right

 

 

 

 

 

 

 

 

 

 

 

 

Remove

Remove

styrofoam

styrofoam

knockout

knockout

 

Remove

Remove

 

 

styrofoam

 

 

styrofoam

 

 

knockout

 

 

knockout

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal Models

Remove circular metal knockout

Ducting

The duct sizing for the furnace section can be determined using HRAI Residential Air System Design Manual, SMACNA, or any other industry-recognized manuals.

Note: "Combo units" normally deliver air at approx. 110°F (43°C), and therefore may require larger than normal ductwork. When installing the Clean Air Furnace as a replacement unit on a retrofit application, always calculate the size of duct that is there.

Any ductwork running through unconditioned space must be sealed properly and insulated to prevent heat loss. All local codes must be followed in determining the amount of insulation needed.

The ventilation section consists of two 6" (15.2cm) round ports located on the side of the cabinet, which vent to the outside. Insulated ducting with a vapour barrier such as flex-ducting, or ridged pipe wrapped in pipe sleeve, is required to prevent condensation from occurring on the pipe. Also the airflow in these lines is designed to be balanced. (See "Balancing Airflows" in this manual, for damper location and procedure).

WARNING

A Backdraft Damper is required in the exhaust air duct to prevent cold air from entering the unit when the Clean Air Furnace is not running.

15

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