INDIRECT GAS-FIRED AIR HEATER

Transcription

1 INDIRECT GAS-FIRED AIR EATER DG() SERIES INDOOR/OUTDOOR INSTALLATION MANUFACTURED BY

2 TABLE OF CONTENTS Description... Applications... Selection criteria... Installation guidelines... Selection table...7 Dimensions Models DG() 20 to... 8 Models DG() 7 to Models DG() 2 to Models DG() 20 to... Models DG() to Models DG() 2 to 2... Models DG() 0 to Roof curbs dimensions...8 Weight table...9 Options Remote control panel (optional)... 2 Gas piping... Characteristics...23 Typical specifications...2 Warranty...27 The features, illustrations and description in this document were, to our knowledge, accurate at the time they were approved for printing. We reserve the right to change or stop offering some features as well as stop producing a given model without prior notice and commitment on our part. 3

3 DESCRIPTION The DG() indirect gas-fired air heaters manufactured by BOUSQUET are certified for both indoor and outdoor installation and designed to serve as a heating system for make-up air or recirculated air. They operate with a minimum thermal efficiency of % and use natural or propane gas. The capacities available range from 200 to 00 MB (from 9 to kw) and from 000 to,000 SCFM (from 888 to 2,7 l/s) of air at temperature differences of F to 20 F (from C to C), which enables flexibility of use for multiple applications. The multiple pass heat exchanger comprises a primary drum and secondary tubes made of series L stainless steel requiring no thermal treatment to prevent the cracking of welded joints. In addition, series L stainless steel is known for its great resistance to corrosion and high temperatures, which increases the service life of the unit. The exchanger is equipped with access panels for the inspection and cleaning of the tubes. It is installed as to enable the thermal expansion that occurs during the heating cycles of the unit. The forced combustion air and high gas modulation burner with a 20: turndown ratio offers optimal heat transfer on all the surfaces of the exchanger while maintaining optimal combustion efficiency through the entire range of capacity. The heavy duty base frame of the unit is made of structural type U-shaped channels. The walls and roof are made of 8 gauges G galvanized steel panels with double folded longitudinal edges. The single wall units are insulated with a one-inch anti-bacterial Fiber Glass Duct Liner with Reinforced Coating. The exchanger section is double wall insulated with two inches high temperature Fiber Glass Blanket.lb/pi 3 density, and covered with a gauge G galvanized steel liner. The weatherproof control cabinet has one large access door to allow for the maintenance of the gas piping and electrical components. The exterior surfaces of the unit are treated with a phosphate cleaner-conditioner and covered with a synthetic Chromating Phosphate with anticorrosive primer. The finish is ensured with first quality high performance alkyd resin enamel. When required, a fresh air intake cowl, a mixing box with filters, motorized damper, or downturn or upward discharge plenum may be incorporated into the DG() unit. DG() heaters are C ETL US approved and are certified according to standards CAN/CGA3.2 and UL 79. APPLICATIONS Fresh air compensation with or without recirculation Apartment building corridors Schools ospitals Industries Industrial and commercial warm air heating systems Ventilation unit with cooling, re-circulation and/or economizer cycle

4 SELECTION CRITERIA. Capacity Required CFM External static pressure Required temperature rise Required final air temperature Type of gas 2. Type of installation Indoor Outdoor 3. Control location On the left-hand or right-hand side of the heater (when facing the airflow). Airflow configuration Direction of the airflow (vertical or horizontal) 00% fresh air 00% recirculated air Modulation (recirculated/fresh air). Temperature control Electronic controller with integral temperature sensor Electronic controller for a 0-0 VDC or -20 ma external signal. Remote controls (optional) Basic or deluxe control panel Room thermostat 7. Other options Low limit temperature sensor Air mixture temperature sensor Lighting Power outlets Switches Main power disconnect Gas piping according to FM standard Gas piping according to IRI standard

5 INSTALLATION GUIDELINES The installer of a heater such as the DG() must follow certain rules in order to comply with the codes governing gas equipment. ere are some recommendations: When gas pressure exceeds /2 psig (3.kPa), a high pressure regulator must be supplied and installed by the contractor. This regulator must have the same modulation capability as the burner (20: turndown). Allow for sufficient clearance around the unit to enable its installation and maintenance. For indoor installation, all purge and regulator vents must be individually piped to the exterior according to code CGA-B9 or other codes in effect; the chimney must satisfy the following requirements: have double walls be certified for positive pressure units (type PS) be certified ULC/UL; ensure that there is enough air for the combustion in the room where the heater is installed (refer to code in effect); ensure that the combustion air is clean and free of dust or corrosive material that could reduce the service life of the unit. For chimney and breeching dimensions, consult the manufacturer. For any other information related to the installation of the DG() air heaters, refer to the installation and service manual pertaining to these units.

6 SELECTION TABLE Using the selection table below, choose the DG() heater according to the required airflow and net heating capacity. Model DG() Burner capacity Net capacity Amperage 2 (A) Airflow 3 MB kw MB kw (7/3/) CFM l/s Notes:. Corresponding to the burner and gas piping nominal capacity 2. Amperage required for the burner motor and controls (fan motor not included). For other voltage, consult the manufacturer. 3. For a temperature rise of F to 20 F ( C to C) For less or more CFM, consult the manufacturer.. The DG() 20 and heaters are not certified C ETL in Canada. 7

7 MOTOR ORSEPOWER (P) Model DG() 20 DG() DG() 3 DG() 0 DG() DG() DG() Δ T ( F) Airflow CFM Fan (2) 2-2 (2) External static pressure in inches of water Notes:. Motor brake horsepower does not include the loss caused by pulley and belt friction (add %). 2. Fan with airfoil backward-inclined wheel 3. Internal static pressure includes the static pressure lost through the air intake, dampers, 2-inches filters (%) and heat exchanger. For other fan selections, consult the manufacturer. 8

8 MOTOR ORSEPOWER (kw) Model DG() 20 DG() DG() 3 DG() 0 DG() DG() DG() Δ T ( C) Airflow l/s Fan (2) 2-2 (2) External static pressure in Pa Notes:. Motor brake horsepower does not include the loss caused by pulley and belt friction (add %). 2. Fan with airfoil backward-inclined wheel 3. Internal static pressure includes the static pressure lost through the air intake, dampers, 2-inches filters (%) and heat exchanger. For other fan selections, consult the manufacturer. 9

9 MOTOR ORSEPOWER (P) Model DG() 7 DG() 8 DG() 00 DG() 2 DG() DG() 7 DG() 200 Δ T ( F) Airflow CFM Fan (2) 2-2 (2) - (2) - 2 (2) 2-2 (2) - (2) - 2 (2) - (2) 8-3 (2) - 2 (2) 8-3 (2) 8-8 (2) (2) 8-8 (2) 20- (2) (2) 20- (2) (2) (2) 20- (2) (2) External static pressure in inches of water Notes:. Motor brake horsepower does not include the loss caused by pulley and belt friction (add %). 2. Fan with airfoil backward-inclined wheel 3. Internal static pressure includes the static pressure lost through the air intake, dampers, 2-inches filters (%) and heat exchanger. For other fan selections, consult the manufacturer.

10 MOTOR ORSEPOWER (kw) Model DG() 7 DG() 8 DG() 00 DG() 2 DG() DG() 7 DG() 200 Δ T ( C) Airflow l/s Fan (2) 2-2 (2) - (2) - 2 (2) 2-2 (2) - (2) - 2 (2) - (2) 8-3 (2) - 2 (2) 8-3 (2) 8-8 (2) (2) 8-8 (2) 20- (2) (2) 20- (2) (2) (2) 20- (2) (2) External static pressure in Pa Notes:. Motor brake horsepower does not include the loss caused by pulley and belt friction (add %). 2. Fan with airfoil backward-inclined wheel 3. Internal static pressure includes the static pressure lost through the air intake, dampers, 2-inches filters (%) and heat exchanger. For other fan selections, consult the manufacturer.

11 Model DG() 2 DG() 0 DG() 3 DG() 00 DG() 0 Δ T( F) Airflow CFM Fan (2) (2) - (2) - 2 (2) -20 (2) 2-2 (2) (2) 2-20 (2) -2 (2) - 2 (2) 2-2 (2) - (2) - 2 (2) - (2) (2) MOTOR ORSEPOWER (P) External static pressure in inches of water Notes:. Motor brake horsepower does not include the loss caused by pulley and belt friction (add %). 2. Fan with airfoil backward-inclined wheel 3. Internal static pressure includes the static pressure lost through the air intake, dampers, 2-inches filters (%) and heat exchanger. For other fan selections, consult the manufacturer. 2

12 Model DG() 2 DG() 0 DG() 3 DG() 00 DG() 0 Δ T( C) Airflow l/s Fan (2) (2) - (2) - 2 (2) -20 (2) 2-2 (2) (2) 2-20 (2) -2 (2) - 2 (2) 2-2 (2) - (2) - 2 (2) - (2) (2) MOTOR ORSEPOWER (kw) External static pressure in Pa Notes:. Motor brake horsepower does not include the loss caused by pulley and belt friction (add %). 2. Fan with airfoil backward-inclined wheel 3. Internal static pressure includes the static pressure lost through the air intake, dampers, 2-inches filters (%) and heat exchanger. For other fan selections, consult the manufacturer. 3

13 DIMENSIONS Models DG() 20,, 3, 0, and S U V A PANEL Drain Ø3/8 (7) W K R C K Drain Ø3/8 (0) TO CONTROLS D T PANNEL OUTDOOR MODEL ONLY 3 (7) B E J ØL TO PIPING M Q P BB ( ) mm DIMENSIONS F Gas G N F Drain Ø3/8 (0) Filters in air intake () Filters in V filter section () A B BB C D E F G J K L M N P Q R S T U V W Ø GAS Ø VENT 2,3 Ø PURGE 3 inches (2) x2 (2) 20x2 (2) x2 (2) 20x2 DG() 20 mm (2) 0x3 (2) 8x3 (2) 0x3 (2) 8x3 inches (2) x2 (2) 20x2 (2) x2 (2) 20x2 8 8 DG() mm (2) 0x3 (2) 8x3 (2) 0x3 (2) 8x inches (2) x2 (2) 20x2 (2) x2 (2) 20x2 8 8 DG() 3 mm (2) 0x3 (2) 8x3 (2) 0x3 (2) 8x DG() 0 inches mm () x2 () 20x2 () 0x3 () 8x3 DG() inches mm () x2 () 20x2 () 0x3 () 8x3. With an inlet gas pressure of inches water column (3.kPa) 2. Indoor installation only 3. The purge (IRI option) and regulator vents must be piped separately to the outdoor.. Filter area is calculated for an air flow corresponding to a o F temperature rise (NOT o F).. The length and width of the curb are /2 inch smaller than those of the unit; the curb is 7 inches high.. The controls shown are on the left-hand side of the unit (controls on the right-hand side are also available). 7. For outdoor installation only. DG() inches mm () x2 () 20x2 () 0x3 () 8x / / / / / / / / / / / / /2 2 0-/ / /2 2 0-/ / /2 2 0-/ /

14 DIMENSIONS Models DG(), 7, 8 and 00 S U V A PANEL Drain Ø3/8 (7) W K R C Drain Ø3/8 (0) TO CONTROLS D T PANEL OUTDOOR MODEL ONLY 3 (7) E Ø L B J TO PIPING M Q P BB ( ) mm DIMENSIONS F G Gas Drain Ø3/8 (0) N F Filters in air intake () Filters in V filter section () A B BB C D E F G J K L M N P Q R S T U V W Ø GAS Ø VENT 2,3 Ø PURGE 3 inches () 20x2 (3) 20x20 () 20x2 (3) 20x20 DG() mm DG() 7 inches mm DG() 8 inches mm DG() 00 inches mm () 8x3 () 20x2 () 8x3 (3) 20x20 () 8x8 (3) 20x20 () 8x8 (3) 8x8 (3) 20x20 (3) 8x8 () 20x2 () 8x3 () 20x2 () 8x3 () 8x3 () 20x2 () 8x3 (3) 8x8 (3) 20x20 (3) 8x8 (2) 20x2 (2) 8x3 (2) 20x2 (2) 8x / / 3 7 / / / 3 7 / / /2 0 -/2 2 2-/ /2 / / /2 0 -/2 2 2-/ /2 / With an inlet gas pressure of inches of water column (3.kPa) 2. Indoor installation only 3. The purge (IRI option) and regulator vents must be piped separately to the outdoor.. Filter area is calculated for an air flow corresponding to a o F temperature rise (NOT o F).. The length and width of the curb are /2 inch smaller than those of the unit; the curb is 7 inches high.. The controls shown are on the left-hand side of the unit (controls on the right-hand side are also available). 7. For outdoor installation only.

15 DIMENSIONS Models DG() 2,, 7, 200 and 2 S U V A PANNEL Drain Ø3/8 (7) W K R C Drain Ø3/8 (0) TO CONTROLS D T PANEL OUTDOOR MODEL ONLY 3 (7) E Ø L B E TO PIPING Q BB M P J Gas F ( ) mm DIMENSIONS G Drain Ø3/8 (0) N F Filters in air intake () Filters in V filter section () A B BB C D E F G J K L M N P Q R S T U V W Ø GAS Ø VENT 2,3 Ø PURGE 3 inches () x20 (8) x2 () 20x2 () 20x / DG() 2 mm () 0x8 (8) 0x3 () 8x3 () 8x inches () x20 (8) x2 () 20x2 () 20x / DG() mm () 0x8 (8) 0x3 () 8x3 () 8x inches () x20 (8) x2 () 20x2 () 20x / DG() 7 mm () 0x8 (8) 0x3 () 8x3 () 8x inches (32) x20 (8) x2 (32) x20 (8) x DG() 200 mm (32) 0x8 (8) 0x3 (32) 0x8 (8) 0x inches (32) x20 (8) x2 (32) x20 (8) x DG() 2 mm (32) 0x8 (8) 0x3 (32) 0x8 (8) 0x / /2 / / /2 / / /2 / / /2 / / / With an inlet gas pressure of inches of water column (3.kPa) 2. Indoor installation only 3. The purge (IRI option) and regulator vents must be piped separately to the outdoor.. Filter area is calculated for an air flow corresponding to a o F temperature rise (NOT o F).. The length and width of the curb are /2 inch smaller than those of the unit; the curb is 7 inches high.. The controls shown are on the left-hand side of the unit (controls on the right-hand side are also available). 7. For outdoor installation only.

16 DIMENSIONS Models DG() 0, 3, 00 and 0 S U V AA A PANEL W K R C Drain Ø3/8 (0) Shipped in section DOOR TO CONTROL OUTDOOR MODEL ONLY D PANEL T 2 () E Ø L B E TO PIPING Q BB J M P ( ) mm DIMENSIONS Filters in air intake () Filters in V filter section () A AA B BB C D E F G J K L M N P Q R S T U V W Ø GAS Ø VENT 2,3 Ø PURGE 3 inches () x2 () x20 () x2 () x / /2 F DG() 0 mm () 0x3 () 0x8 () 0x3 () 0x inches () x2 () x20 () x2 () x DG() 3 mm () 0x3 () 0x8 () 0x3 () 0x With an inlet gas pressure of inches of water column (3.kPa) 2. Indoor installation only 3. The purge (IRI option) and regulator vents must be piped separately to the outdoor.. Lenght AA is for heaters with vertical discharge without turn plenum.. Filter area is calculated for an air flow corresponding to a o F temperature rise (NOT o F).. The length and width of the curb are /2 inch smaller than those of the unit; the curb is 7 inches high. 7. The controls shown are on the left-hand side of the unit (controls on the right-hand side are also available). 8. For outdoor installation only. G inches () 20x2 () 20x20 (3) 20x2 (7) 20x Gas Drain Ø3/8 (0) DG() / / / / -/ / / -/ mm () 8x3 () 8x8 (3) 8x3 (7) 8x N inches () 20x2 () 20x20 (3) 20x2 (7) 20x F DG() 0 mm () 8x3 () 8x8 (3) 8x3 (7) 8x

17 ROOF CURB TO PIPING UNIT (ELEVATION VIEW) DOWNTURN PLENUM OPTION ROOF CURB 7 (32) K R K D D F ( ) mm DIMENSIONS U V ROOF CURB (PLAN VIEW) I A AA W A AA C D F I K R U V W DG() 20,, 3 DG() 0,, INCES MM INCES MM 8 - -/2-3/ 3-3/ 3-3/ /2-3/ 3-3/ / -3/ / -3/ / / 7 INCES 8-73-/2-3/ 3-3/ DG(), 7 MM / 2 INCES - 77-/2 8-3/ 2-3/ DG() 8, 00 MM / / -3/ / -3/ / 7 3-3/ 883 DG() 2,, 7 INCES 7-97-/2 8-/ 3-3/ MM INCES /2-3/ -3/ DG() 200, 2 MM / -3/ / -3/ / -3/ / 37-3/ INCES 0 9-/2 8-3/ -3/ DG() 0, 3 MM / 2 INCES /2 8-3/ -3/ DG() 00 MM / / 83-3/ / 9-3/ / 73-3/ 873 INCES /2 8-3/ -3/ DG() 0 MM / -3/ / 9-3/ / 873 8

18 WEIGT TABLE MODEL DG() 20 DG() DG() 3 DG() 0 DG() DG() DG() DG() 7 DG() 8 DG() 00 DG() 2 DG() DG() 7 DG() 200 DG() 2 DG() 0 DG() 3 DG() 00 DG() 0 AIR INTAKE OOD Lb kg FRES AIR WIT RECIRCULATION Lb kg % FRES AIR Lb kg EXCANGER Lb kg PLENUM 2 Lb kg Notes:. This weight includes the V filter section. 2. Optional discharge plenum is used to turn the air flow for either up, down or side discharge. Up and down discharge are also available without the turn plenum. 9

19 OPTIONS Package with Dx Condensing Unit (up to 00 tons) Cooling or Recovery Coils Lighting fixture Annunciator S78A00 Mushroom air intake Display A03 20

20 REMOTE CONTROL PANEL (optional) Basic Panel (0 /2 w x /2 h) Stop/fan/burner selector switch Fan operation light Burner operation light Connecting terminal block Mid-Size Panel (0 /2 w x 0 /2 h) Basic panel Stop/fan/burner selector switch Fan operation light Burner operation light Connecting terminal block Temperature Selector (A3) Deluxe Panel ( 3/8 w x 7 /2 h) Standard equipment: Stop/start/fan selector switch Stop/start/burner selector switch Fan operation light Burner operation light Flame failure light Connecting terminal block Optional equipment: Low limit alarm light Clogged filter light igh gas pressure alarm light Low gas pressure alarm light Until purge cycle completed light Temperature selector (A3) Key lock Deluxe panel Note: Refer to the manufacturer for other arrangement or feature. 2

21 GAS PIPING COMPONENTS PILOT PIPING Manual shut-off valve Gas pressure regulator Automatic shut-off valve Manual ignition cock MAIN BURNER PIPING Pressure regulator Automatic quick-closing shut-off valve Automatic slow-opening and quick-closing shut-off valve Manual ignition cock /8-inch diameter test port Piping union Modulating valve supplied with burner DESCRIPTIONS OPTIONS Low gas pressure switch (required for: FM, IRI and pressure in excess of /2 psig) Normally open automatic vent valve (required for: IRI) igh gas pressure switch (required for: FM, IRI and pressure in excess of /2 psig)

22 CARACTERISTICS STANDARD CARACTERISTICS: C ETL US certified Natural gas GP Combustion forced draft burner eat exchanger with L stainless steel drum and tubes Gas piping for inlet gas pressure of inches of water column (3.kPa) Main power supply (7 volts/3 phases/ cycles) Single point connecting terminal block All the components required for the proper operation of the unit Flame rod detector Pre-purge period Galvanized steel (8 gauge) painted enamel -inch thick reinforced coated filler glass insulation Exchanger section: 2-inch thick ( mm) high temperature insulating material with a density of.lb/ft 3, with a gauge galvanized steel liner Access doors with screw-on knob handles Lifting lugs on both sides of the unit for easy handling and installation Access panel to the exchanger tubes (for cleaning purposes) Drain Burner automatic valve interlock Supply air temperature controller OPTIONAL CARACTERISTICS: Electric power supply (208, volts/3 phases/ cycles) igh gas pressure regulator (for pressure above inches of water column) MAXON burner Propane gas eat exchanger with 3L stainless steel drum and tubes Gas piping to FM or IRI requirement Ultra-violet flame detector Main power supply disconnect with or without fuses Terminal block to interface with a centralized building automation system Modulation controller with 0-0 VDC or -20 ma signal from a central building automation system Room thermostat Maintenance vestibule Maintenance platform Double wall construction (2, 3 or thick) 20-volt electrical outlet Waterproof lighting fixture Space for coils Coils (cooling, heat recovery,...) Note: Refer to manufacturer for any other options. 23

23 TYPICAL SPECIFICATIONS GENERAL Supply and install a Bousquet model DG() indirect gas-fired heater operating on natural gas for indoor (outdoor) installation. The manufacturer must be accredited by the CWB in compliance with standard CSA W7.. to meet the minimum standard applicable to all types of welds including the welds on a stainless steel heat exchanger. PERFORMANCE The heater will have the capacity to heat CFM of standard air from F to F, for a net heat output of MB at a minimum combustion efficiency of %. The fuel used will be natural gas at an inlet pressure of psig. UNIT CONSTRUCTION TThe heavy duty base frame of the unit shall be made of U-shaped channels. The walls and roof will be made of 8 gauges G galvanized steel panels with double folded longitudinal edges. PVC gaskets between each panel, with an external urethane based caulking shall be provided to ensure for unit water tightness. The single wall units will be insulated with a one-inch anti-bacterial Fiber Glass Duct Liner with Reinforced Coating. The exchanger section is double wall insulated with two inches high temperature Fiber Glass Blanket.lb/pi3 density, and covered with a gauge G galvanized steel liner. The weatherproof control cabinet shall have one large access do0r to allow for the maintenance of the gas piping and electric components. The exterior surfaces of the unit shall be treated with a phosphate cleaner-conditioner and coated with a Synthetic Chromating Phosphate with anti corrosion agent. The finish shall be ensured by first quality high performance alkyd resin enamel. For outdoor applications, all the controls and piping will be installed inside a weatherproof cabinet with access doors for easy maintenance. EAT EXCANGER The multiple pass heat exchanger shall be drum and tube type, with primary drum and secondary tubes entirely made of L stainless steel requiring no thermal treatment to prevent weld cracking and provide great resistance to corrosion and high temperatures, and increase service life of the unit. The exchanger will be equipped with bolted access panels for the inspection and cleaning of the tubes. 00 Series stainless steel, aluminized carbon steel heat exchangers are not acceptable. 2

24 BURNER AND GAS PIPING The burner will be of a forced draft type, factory-installed on the exchanger with all gas piping and control wiring required for the proper operation of the unit. The gas pilot piping will be equipped with an electronic spark ignitor, manual and automatic shut-off valves, pressure regulator, and manual cock. The gas piping of the burner will include a pressure regulator, automatic quick-closing shut-off valve, automatic slow-opening valve, manual ignition cock, test ports and modulating gas valve. The burner and gas piping assembly will have a modulating turndown ratio of at least 20:. Combustion air damper shall modulate with the gas control valve in order to maintain efficiency. eaters with constant speed draft inducer are not acceptable. FAN SECTION The fan section will be designed according to the Air Movement and Control Association standards. The fan and motor will be installed on a steel structure welded in compliance with the Canadian Welding Bureau standards and rest on anti-vibration isolators. An access door will be installed to enable the maintenance of the fan, motor, bearings, belts and pulleys. The motor will be open drip proof (ODP), thermally protected with superior efficiency; it will be installed on a base to enable belt alignment and tension. The fan will be a forward-curved blade type (FC), double width, double inlet (DWDI). FILTER AND DAMPER SECTION Dampers will be of standard construction, galvanized steel blades equipped with electric actuators and limit switch. The filters will be disposable, 2-inch thick, % efficient. An access door will allow for the inspection and changing of the filters BURNER CONTROL MODE (Select one of the following options): G for 00% outside air: Final air temperature is controlled by a 0-0 volts or -20 ma signal provided by other. G2 for 00% outside air: Final air temperature is controlled by a temperature controller and sensor supplied with the unit. G3 for Make-Up air and heating application, with recirculation: Final air temperature is controlled by two temperature controllers sensor and room thermostat supplied with the unit. One of the controllers will be ser for F supply air temperature; the other controller is ser for F supply air temperature; the room thermostat selects the F controller when room temperature is satisfied and the Fcontroller when heat is required. 2

25 AIR CONTROL MODE (Select one of the following options) V: Damper actuators and signal are provided by others. V2-A for 00% outside air: ON/O damper actuator supplied with the unit. V2-B for outside and return air: Modulating dampers actuators supplied with theunit, but controlled by others. V2-C for outside and return air: Modulating damper actuators supplied with theunit and internally controlled with a minimum fresh air potentiometer. REMOTE CONTROL PANEL A remote control panel will be supplied by the manufacturer to turn the unit on from a remote location. It will be outfitted with a stop/fan/burner selection switch and light indicating the operating status of the unit. CERTIFICATION All DG() heaters must be CETLUS approved and certified according to standards CAN/CGA3.2 and UL 79. 2

26 Printed in Canada - Rev (0/2007) MSA-DG, rue Nobel Sainte-Julie (Québec) J3E Z9 MANUFACTURED BY Toll free: Tel : 87- Fax : bousquet@bousquet.ca Web site :