Energy Tech Laboratories MR212 Manuel utilisateur

May 2008 Rev. 11

FOR YOUR SAFETY

The use and storage of gasoline or other flammable vapors and liquids in open containers in the

vicinity of this appliance is hazardous.

Standard and Modular Direct Fired Heaters

Installation, Operation, and Maintenance Manual

Modular Direct Fired Heater Standard Direct Fired Heater

Direct Fired Module

Save these instructions. This document is the property of the owner of this equipment and is

required for future maintenance. Leave this document with the owner when installation or

service is complete.

RECEIVING AND INSPECTION

Upon receiving unit, check for any interior and exterior damage, and if found, report it

immediately to the carrier. Also check that all accessory items are accounted for and are

damage free. Turn the blower wheel by hand to verify free rotation and check the damper (if

supplied) for free operation.

WARNING!!

Improper installation, adjustment, alteration, service or maintenance can cause property

damage, injury or death. Read the installation, operating and maintenance instructions

thoroughly before installing or servicing this equipment. ALWAYS disconnect power and gas

prior to working on heater.

FOR YOUR SAFETY

If you smell gas:

1. Open windows.

2. Don’t touch electrical switches.

3. Extinguish any open flames.

4. Immediately call your gas supplier.

TABLE OF CONTENTS

WARRANTY.................................................................................................................................................. 4

INSTALLATION............................................................................................................................................. 5

Mechanical................................................................................................................................................ 5

Site Preparation.................................................................................................................................... 5

Assembly .............................................................................................................................................. 5

Curb and Ductwork............................................................................................................................... 5

Roof Mount Installation......................................................................................................................... 6

Installation with Exhaust Fan................................................................................................................ 6

Direct Fired Module Installation............................................................................................................ 7

Indoor (INLINE) Installation .................................................................................................................. 7

Heat Module Add-On Installation ......................................................................................................... 7

Gas ........................................................................................................................................................... 8

Electrical ................................................................................................................................................... 9

Motorized Intake Damper ..................................................................................................................... 9

Remote Control Panel ........................................................................................................................ 10

Fan to Building Wiring Connection ..................................................................................................... 10

OPERATION ............................................................................................................................................... 11

Start Up................................................................................................................................................... 11

Special Tools Required ...................................................................................................................... 11

Start Up Procedure............................................................................................................................. 11

Pilot Adjustment.................................................................................................................................. 11

Main Burner Adjustment..................................................................................................................... 12

Heater Start Up Summary .................................................................................................................. 13

Final Start Up Procedure.................................................................................................................... 14

Pulley Adjustment............................................................................................................................... 14

Pulley Alignment................................................................................................................................. 14

Proper Belt Tension............................................................................................................................ 14

Pulley Combination Chart................................................................................................................... 15

Sequence of Operation........................................................................................................................... 16

Flame Safety Control.......................................................................................................................... 16

Air Flow Switch ................................................................................................................................... 16

Modulating Gas System ..................................................................................................................... 17

High Temperature Limit...................................................................................................................... 17

Operation Summary ........................................................................................................................... 17

Optional Remote Panel Circuit ........................................................................................................... 18

Components............................................................................................................................................ 19

Remote Panel Option ......................................................................................................................... 20

Troubleshooting ...................................................................................................................................... 21

Airflow Troubleshooting Chart ............................................................................................................ 21

Burner Troubleshooting Chart ............................................................................................................ 22

Remote Panel Troubleshooting Chart................................................................................................ 23

Troubleshooting Flowcharts ............................................................................................................... 24

MAINTENANCE .......................................................................................................................................... 25

General Maintenance ............................................................................................................................. 25

2 weeks after startup .............................................................................................................................. 26

Every 3 months....................................................................................................................................... 26

Filter Quantity Chart ........................................................................................................................... 26

Yearly...................................................................................................................................................... 26

Start-Up and Maintenance Documentation ............................................................................................ 28

Job Information................................................................................................................................... 28

Heater Information.............................................................................................................................. 28

Maintenance Record .......................................................................................................................... 28

Factory Service Department............................................................................................................... 28

WARRANTY

This equipment is warranted to be free from defects in materials and workmanship, under normal use and

service, for a period of 12 months from date of shipment. This warranty shall not apply if:

1. The equipment is not installed by a qualified installer per the MANUFACTURER’S installation

instructions shipped with the product,

2. The equipment is not installed in accordance with federal, state and local codes and regulations,

3. The equipment is misused or neglected,

4. The equipment is not operated within its published capacity,

5. The invoice is not paid within the terms of the sales agreement.

The MANUFACTURER shall not be liable for incidental and consequential losses and damages

potentially attributable to malfunctioning equipment. Should any part of the equipment prove to be

defective in material or workmanship within the 12-month warranty period, upon examination by the

MANUFACTURER, such part will be repaired or replaced by MANUFACTURER at no charge. The

BUYER shall pay all labor costs incurred in connection with such repair or replacement. Equipment shall

not be returned without MANUFACTURER’S prior authorization and all returned equipment shall be

shipped by the BUYER, freight prepaid to a destination determined by the MANUFACTURER.

INSTALLATION

It is imperative that this unit is installed and operated with the designed airflow, gas, and electrical supply

in accordance with this manual. If there are any questions about any items, please call the service

department at 1-866-784-6900 for warranty and technical support issues.

Mechanical

WARNING: DO NOT RAISE VENTILATOR BY THE INTAKE HOOD, BLOWER OR

MOTOR SHAFT, OR BEARINGS – USE LIFTING LUGS PROVIDED OR A SLING

Site Preparation

1. Provide clearance around installation site to safely rig and

lift equipment into its final position. Supports must

adequately support equipment. Refer to manufacturer’s

estimated weights.

2. Consider general service and installation space when

locating unit.

3. Locate unit close to the space it will serve to reduce long,

twisted duct runs.

4. Do not allow air intake to face prevailing winds. Support

unit above ground or at roof level high enough to prevent

precipitation from being drawn into its inlet. The inlet must

also be located at least 10 feet away from any exhaust

vents. The heater inlet shall be located in accordance with the applicable building code

provisions for ventilation air. All air to the heater must be ducted from the outdoors. Recirculation

of room air is not permitted. If in doubt regarding the application, consult the manufacturer.

Assembly

Intakes and curbs are shipped unassembled. Upon unit arrival, follow the following procedure to

assemble the intake to the heater:

1. Apply silicone or weather-proof gasket on

the back side of the flanges of the intake

hood or v-bank intake.

2. Screw the flanges of the intake hood or v-

bank to the unit with the supplied sheet

metal screws. If the unit is a modular unit

with a v-bank or evaporative cooler section,

the v-bank or evaporative cooler will bolt to

the heater with the bolts provided.

Curb and Ductwork

This fan was specified for a specific CFM and static pressure. The ductwork attached to this unit will

significantly affect the airflow performance. Flexible ductwork and square elbows should not be used.

Also, transitions and turns in ductwork near the fan outlet will cause system effect and will drastically

increase the static pressure and reduce airflow. The chart below shows the minimum fan outlet duct

sizes and straight lengths recommended for optimal fan performance. Follow SMACNA guides and

recommendations for the remaining duct run. Fans designed for rooftop installation should be

installed on a prefabricated or factory built roof curb. Follow curb manufacturer’s instructions for proper

curb installation. The unit should be installed on a curb and/or rail elevated not less than 20” above any

surface. Be sure duct connection and fan outlet are properly aligned and sealed. Secure fan to curb

CLEARANCES

The top, back, and front

surfaces of this heater may not

be installed less than 6” from

combustible materials. The

heater base may be installed

on combustible surfaces.

Allow 24” minimum service

clearance on both sides of this

heater.

Recommended Supply Ductwork Sizes

Blower Size Duct Size Straight Duct Length

10 14 x 14 48 in.

12 16 x 16 54 in.

15 20 x 20 72 in.

18 24 x 24 86 in.

20 26 x 26 108 in.

25 32 x 32 168 in.

through vertical portion of the ventilator base

assembly flange using a minimum of eight (8) lug

screws, anchor bolts, or other suitable fasteners (not

furnished). Shims may be required depending upon

curb installation and roofing material. Check all

fasteners for tightness. The diagrams below show

different mechanical installation configurations.

Adequate building relief shall be provided so as to

not over pressurize the building when the heating

system is operating at its rated capacity. This can be accomplished by taking into account, through

standard engineering methods, the structure’s designed infiltration rate; by providing properly sized relief

openings; or by interlocking a powered exhaust system; or by a combination of these methods.

Heaters installed with intake ductwork must be purged to replace at least four air changes of the volume

of the intake duct.

If the failure or malfunction of this heater creates a hazard to other fuel burning equipment in the building

(e.g. when the heater is providing make up air to a boiler room), the unit is to be interlocked to open inlet

air dampers or other such devices.

Units being installed in airplane hangars should be installed in accordance with the Standard for Aircraft

Hangars, ANSI/NFPA 409. Units being installed in public garages should be installed in accordance

with the Standard for Parking Structures, ANSI/NFPA 88A, or the Standard for Repair Garages,

ANSI/NFPA 88B, and with CAN/CGA B149 Installation Codes.

Roof Mount Installation

Installation with Exhaust Fan

Direct Fired Module Installation

Indoor (INLINE) Installation

Heat Module Add-On Installation

Modular heat units shipped to add heat onto existing blower only applications require field mechanical

and wiring installation.

1. Remove existing filter intake and lifting lugs from blower section intake side.

2. Attach heat module to blower intake using the provided sheet metal screws and bolts. Tighten

screws and bolts securely to compress the

gasket between the heat module and the

blower module.

3. Support and level the end of the heat module

(end opposite the blower) with the provided

equipment legs/rails.

4. Attach the filter hood to the intake side of the

heater module.

5. Drill a hole in the discharge of the blower large

enough to insert the Maxitrol mixing tube and

discharge sensor (if provided). Install the Maxitrol mixing tube in the proper airflow direction. The

airflow direction is labeled on the Maxitrol mixing tube.

6. Wire the sensor as indicated on the supplied wiring schematic. Run all wiring within metal

conduit. Supply 120V AC to terminals 1 and N in the direct fired module.

7. Follow the start up instructions located in this manual.

Gas Pressure Table

Gas Pressure Type Gas Pressure

Size 1-3 Inlet Pressure 7 in. w.c. – 14 in. w.c.

Size 4-5 Inlet Pressure 7 in. w.c. – 5 psi.

Max. Manifold Pressure - Natural Gas 5 in. w.c. maximum

Max. Manifold Pressure - Propane 2.5 in. w.c. maximum

Gas Connection Sizes

Unit Size Gas Pipe Size (NPT)

Size 1 ¾”

Size 2 1”

Size 3 1”

Size 4 1-1/4”

Size 5 1-1/2”

Gas Connection Diagram

Gas

Installation of gas piping must conform with local building codes, or in the absence of local codes, with the

National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition. In Canada, installation must be in

accordance with CAN/CGA-B149.1 for natural gas units and CAN/CGA-B149.2 for propane units.

WARNING: INLET GAS PRESSURE MUST NOT EXCEED PRESSURE INDICATED

ON NAMEPLATE. SEE UNIT NAMEPLATE FOR PROPER GAS SUPPLY

PRESSURE AND GAS TYPE.

1. Always disconnect power before working on or near a heater. Lock and tag the disconnect

switch or breaker to prevent accidental power up.

2. Piping to the unit should conform with local and national requirements for type and volume of gas

handled, and pressure drop allowed in the line. Refer to the Gas Engineer’s Handbook for gas

line capacities.

3. The incoming pipe near the heater should be sized to

match the connection on the outside of the unit. Unit inlet

sizes are shown in the table to the right. Avoid multiple

taps in the gas supply so the unit has a steady supply of

gas at all times.

4. Install a ground joint union with brass seat and a manual

shut-off valve external to the unit casing, as shown below,

adjacent to the unit for emergency shut-off and easy

servicing of controls.

5. Provide a sediment trap, as shown below, before each

unit and where low spots in the pipe line cannot be avoided.

6. Blow out the gas line to remove debris before making connections. Purge line to remove air

before attempting to start unit. Purging of air from gas lines should be performed as described in

ANSI Z223.1-latest edition “National Fuel Gas Code”, or in Canada in CAN/CGA-B149.

7. All field gas piping must be pressure/leak tested prior to unit operation. Use a non-corrosive

bubble forming solution or equivalent

for leak testing. The heater and its

individual shut-off valve must be

disconnected from the gas supply

piping system during any pressure

testing of that system at test

pressures in excess of ½ psi. The

heater must be isolated from the gas

supply piping system by closing its

individual manual shutoff valve

during any pressure testing of the gas supply piping system at test pressures equal to or less

than ½ psi.

8. This unit requires a constant 7 in. w.c. minimum

natural gas supply, when the unit is operating at

maximum gas flow. If the gas supply exceeds 14 in.

w.c. (5 psi. for sizes 4-5 housings) it will damage the

internal valve components, and if it is below 7 in.

w.c., the heater may not perform to specifications.

NOTICE

Refer to the heater rating

plate for determining the

minimum gas supply

pressure for obtaining the

maximum gas capacity for

which this heater is specified.

Copper Wire Ampacity

Wire Size AWG Maximum Amps

14 20

12 25

10 30

8 40

6 55

4 70

Electrical

Before connecting power to the heater, read and understand this

entire section of this document. As-built wiring diagrams are

furnished with each fan by the factory, and are attached to the

door of the unit.

Electrical wiring and connections should be done in accordance

with local ordnances and the National Electric Code,

ANSI/NFPA70. Be sure the voltage and phase of the power

supply and the wire amperage capacity is in accordance with the

motor nameplate. For additional safety information refer to AMCA publication 410-96, Recommended

Safety Practices for Users and Installers of Industrial and Commercial Fans.

1. Always disconnect power before working on or near a

heater. Lock and tag the disconnect switch or breaker to

prevent accidental power up.

2. An electrical drop containing the motor power wiring is

shipped with every fan. The electrical drop should be

brought through one of the conduit openings located in

the base of the unit, run through the curb, and connected

to a junction box inside the building.

3. A dedicated branch circuit should supply the motor circuit

with short circuit protection according to the National

Electric Code. This dedicated branch should be run to the junction box mentioned above and

connected as shown in a following

illustration labeled “Fan to Building

Wiring Connection”.

4. Make certain that the power source

is compatible with the

requirements of your equipment.

The heater nameplate identifies

the proper phase and voltage of

the motor.

5. Units shipped with an optional

remote panel have two electrical

circuit drops. It is important to run

the motor wires in a separate conduit from the remote control wiring. The DC wires from the unit

temperature controller, located in the control drop, should either be shielded cable or be run in a

separate conduit.

6. Before connecting heater to the building power source, verify power line wiring is de-energized.

7. Secure the power cables to prevent contact with sharp objects.

8. Do not kink power cable and never allow the cable to come in contact with oil, grease, hot

surfaces or chemicals.

9. Before powering up the heater, check fan wheel for free rotation and make sure that the interior of

the heater is free of loose debris or shipping materials.

10. If any of the original wire supplied with the heater must be replaced, it must be replaced with type

TW wire or equivalent.

Motorized Intake Damper

On units shipped with the optional motorized intake damper, a power transformer is supplied with the unit

if the main incoming voltage is greater than 120V. The damper motor is automatically energized when

the main disconnect switch is in the ON position. No external wiring to the damper motor is required.

WARNING!!

Disconnect power before

installing or servicing fan. High

voltage electrical input is

needed for this equipment. This

work should be performed by a

qualified electrician.

Remote Control Panel

On units shipped with the optional remote control panel, an electrical drop containing the panel wiring is

provided with the heater. There is a terminal strip inside the remote panel that matches the terminals in

the heater unit. The remote panel should be wired as shown below.

Fire System

Microswitch

Fan to Building Wiring Connection

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