Burnham BH-33, BH-47, BH-63, BH-86, BH-108 Installation & Service Instructions Manual

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TABLE OF CONTENTS

I. PRECAUTIONS - IMPORTANT INFORMATION .................................................3

II. GENERAL INFORMATION

A. Installation Limitations ..............................................................................................4

B. Inspection on Arrival .................................................................................................4

III. INSTALLATION

A. Special Precautions ....................................................................................................4

B. Unit Suspension ........................................................................................................4

C. Unit Heater Mounting Height ....................................................................................5

D. Piping Installation ......................................................................................................5

E. Wiring Instructions .....................................................................................................5

IV. OPERATION

A. Prior to Operation ......................................................................................................8

B. Initial Start-up ............................................................................................................8

V. MAINTENANCE

A. Regular Inspection .....................................................................................................9

B. Motors ........................................................................................................................9

C. Casings .......................................................................................................................9

D. Coils ...........................................................................................................................9

VI. APPLICATION GUIDELINES

A. General Guidelines ..................................................................................................10

B. Steam Performance Data .........................................................................................11

C. Selection Procedure - Steam Application ................................................................12

D. Steam Calculation Formulas ....................................................................................13

E. Steam Correction Factors .........................................................................................14

F. Hot Water Performance Data ....................................................................................17

G. Selection Procedure - Hot Water Application ..........................................................18

H. Hot Water Calculation Formulas .............................................................................19

I. Hot Water Correction Factors ...................................................................................20

VII. OPTIONS, ACCESSORIES AND CONTROL SEQUENCES

A. Field Installed Options for Horizontal and Vertical Models ....................................21

B. Control Sequences ...................................................................................................21

C. Field Installed Options for Horizontal Models Only ...............................................21

D. Field Installed Options for Vertical Models Only ...................................................22

VIII. DIMENSIONAL DATA

A. BH Dimensional Data ..............................................................................................25

B. BV Dimensional Data ..............................................................................................26

IX. MOTOR DATA ...........................................................................................................27

WARRANTY ................................................................................................Back Cover

I. IMPORTANT INFORMATION - READ CAREFULLY BEFORE INSTALLATION

The following terms are used throughout this manual to bring attention to the presence of hazards of various risk levels, or to

important information concerning product life.

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II. GENERAL INFORMATION

A. INSTALLATION LIMITATIONS

Installation and service instructions in this manual are

applicable to the steam/hot water unit heaters which should be installed in their proper applications for their most effective function as overhead heating units. The copper coils are warranted for operation at steam or hot water pressures up to 150 psig, and/or temperatures up to 375°F. Canadian Standards Association (CSA) requirements state that explosion-proof units may not be used with a ﬂ uid temperature in excess of 329°F and still maintain their explosion-proof rating, for national electric code ignition temperature rating T3B for grain dust.

B. INSPECTION ON ARRIVAL

1. Inspect unit upon arrival. In case of damage, report immediately to transportation company and your local Burnham Hydronics Representative.

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2. Check rating plate on unit and motor to verify that power input and motor speciﬁ cation meet available electric power at point of installation.

3. Inspect unit received for conformance with description of product ordered (including speciﬁ cations where applicable).

III. INSTALLATION

SPECIAL PRECAUTIONS

1. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage. All units must be wired strictly in accordance with wiring diagram furnished with unit.

2. Units should not be installed in atmospheres where corrosive fumes or sprays are present.

3. Units must not be installed in potentially explosive or ﬂ ammable atmospheres.

4. Be sure no obstructions block air intake or air discharge of unit heater.

5. Do not install unit above recommended maximum mounting heights (see Table 1) or below the minimum height of eight feet.

B. UNIT SUSPENSION

Horizontal Delivery Units, Model BH Series

All horizontal delivery units have two tapped holes

(3/8”-16) in the top for unit suspension. Piping support hangers or clamps are recommended and should be placed as close to the unit heater as possible. For other models, independent suspension can be made with threaded rods, pipes, or ceiling hanger brackets.

Figure 1: Horizontal Air Delivery

Vertical Delivery Units, Model BV Series

Models BV-42 through BV-161 have 4 tapped holes

(1/2”-13) on the top surface for unit suspension. Suspension can be made with threaded rods, pipes, or ceiling hanger brackets. Models BV-193 through BV-610 have angle-iron frame mounting brackets for heavy-duty installation with applicable hardware.

No Deﬂ ector

accessories. Locate horizontal delivery unit heaters so air streams of individual units wipe the exposed walls of the building with either parallel or angular ﬂ ow without blowing directly against the walls. Heaters should be spaced so the air stream from one supports the air stream from another heater. Locate vertical delivery unit heaters in the center area of the space to be heated, using horizontal delivery unit heaters along the walls where heat loss is usually greatest.

D. PIPING INSTALLATION

Horizontal and Vertical Unit Heaters

Note: Only make piping connections using two (2)

pipe wrenches. One wrench is used as a “back-up” while the other wrench is used for applying force necessary to tighten the ﬁ tting.

Two-Way Louver

4-Cone Anemostat

Truncone

Figure 2: Vertical Air Delivery

C. UNIT HEATER MOUNTING HEIGHT

Do not install unit above recommended maximum

mounting heights or below the minimum height of eight feet. The height at which unit heaters are installed is critical. Maximum mounting heights for all units are listed in Table 1. Maximum mounting heights for Model BV is given for units with or without air diffusion

The illustrations, on page 6, suggest four (4) different

piping conﬁ gurations. Refer to the ASHRAE Guide & Specialty Manufacturer for selection of ﬁ lter, piping traps and other specialty sizing. Piping is typical for unit heaters.

E. WIRING INSTRUCTIONS

1. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage. All units must be wired strictly in accordance with wiring diagram (Figure 3).

2. All wiring must be done in accordance with the National Electric Code and applicable local codes. In Canada, wiring must conform to the Canadian Electric Code. It is recommended that all wiring be adequately grounded.

3. Electric wiring must be sized to carry the full load amp draw of the motor, starter, and any controls that are used with the unit heater. Overcurrent protectors should be sized based on motor current rating shown on the unit serial plate, and applicable national electric code procedures.

4. All units should be installed with an electrical junction box. Junction boxes are either integral to the motor or to be attached to the unit casing. Units with explosion-proof motors have an explosionproof junction box attached to the motor. Any damage to or failure of Burnham Hydronics heater units caused by incorrect wiring of the units is not covered by Burnham Hydronics standard warranty.

Figure 3: 115V / 60Hz / 1PH Wiring Schematic

Table 1: Recommended Maximum Mounting Height

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81-HB971 24-VB117151118 913111822822882

42-HB981 95-VB3102813195261410182982853

33-HB0102 87-VB412291411162715111031103803

74-HB2152 59-VB614212611162715111031103803

36-HB4192 931-VB817242813123128131633163954

68-HB5113 161-VB1213821241533202410441040105

801-HB5123 391-VB3243133261935222514461442155

121-HB6133 212-VB5273335261935222514461442155

561-HB7143 742-VB6293436271640362812571253156

391-HB8173 972-VB0354730381355303120681063157

852-HB9104 333-VB0354730371355303120671063157

092-HB0244 583-VB0354630371355303120671063157

043-HB0264 005-VB7365447391562473624791473139

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Horizontal Unit Heater Connected to

Overhead Hot Water Mains

Vertical Unit Heater Connected to

Overhead Hot Water Mains

Figure 4: Hot Water System Piping

Unit Heater Connection for High Pressure Steam

Unit Heater Connection for Low Pressure Steam - Open Grav-

ity or Vacuum Return System

Figure 5: Steam System Piping

IV. OPERATION

A. PRIOR TO OPERATION

1. Check all electrical connections to assure they are secure.

2. Check rigidity of unit mounting. Tighten all fasteners, if necessary.

3. Inspect piping, strainers, traps, ﬁ ttings, etc.

B. INITIAL START-UP

1. Set thermostat to lowest position.

2. Turn on power supply to unit.

3. Open return gate valve, and then open supply gate valve to unit.

4. Raise thermostat setting to desired position.

5. Adjust louvers (if provided) for desired heat distribution.

6. To insure proper sequence of operation, cycle unit on and off a few times by raising and lowering thermostat setting.

7. Check for proper rotation of fan. All fans must rotate in a counterclockwise direction when viewed from the back (BH) of the unit heater.

V. MAINTENANCE

INSPECT REGULARLY

Under average conditions, it is recommended that

unit heaters be inspected before every heating season — more often in locations where air is contaminated with corrosive fumes, dust, soot or oil spray. Check for dirty, clogged coils, excessive vibration and loose connections. Inspect piping, strainers, traps, ﬁ ttings, etc.

B. MOTORS

1. Cleaning Remove grease and dirt on motor during each

inspection or lubrication. Open frame motors should be blown clean every heating season, or whenever coils are cleaned, whichever is sooner.

2. Lubrication Lubricate motor according to manufacturer’s

instructions located on the motor. When no motor oiling instructions are on the motor, oil the motor every two thousand hours of operation with SAE20 motor oil for units in normal applications. Adjust oiling according to usage and atmosphere. Some motors do not have oil ﬁ ttings. These motors are lubricated for long life and do not require further lubrication.

3. Overload Protection A change in line voltage higher or lower than motor

nameplate rating may cause overheating and serious motor damage. Check plant voltage conditions. A separate manual starter with thermal overload protection device is recommended for those units that do not have motors with built in overload protection.

C. CASINGS

1. Cleaning Periodic cleaning of casings is recommended to

remove dirt, grease and corrosive substances that may injure ﬁ nish. Rusted or corroded spots should be cleaned and repainted.

2. General Inspection Tighten fan guard and motor bracket. Check fan for

proper clearance, free rotation and ﬁ rm connection to shaft. When servicing is complete, tag unit to indicate date of inspection, lubrication and cleaning.

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D. COILS

1. Cleaning Clean coil at least once a year, more often under

unfavorable conditions. Unless coil is kept reasonably free of dirt, lint and grease, its original heating capacity will be reduced — possibly to a serious degree, and motor damage may result.

Two commonly used cleaning methods are:

a. Loosen dirt by brushing ﬁ ns on side where air

enters coil and then turn on fan to blow dirt from unit.

b. Use high-pressure air hose to loosen dirt by

blowing from side where air leaves coil (side adjacent to louvers on blow-through units (BH); side adjacent to fan on draw-through units (BV)). For thorough cleaning of coil, remove motor and fan and spray a mild alkaline cleaning solution over the coil. After a few minutes, follow by a hot water rinse. (A steam gun can be used for spraying cleaning solution and hot water.) Coils subjected to corrosive fumes should be checked and cleaned frequently.

2. Internal Corrosion Safeguards Provide controlled water treatment -- don’t use

excess of boiler compounds. Contact your boiler compound supplier for proper usage or the services of a water treatment laboratory. Periodic internal ﬂ ushing of the coils is recommended in areas where water supply is suspected of causing scale. Use an alkaline-chelant solution and introduce it at the main pump of the hydronic system. Flush thoroughly.

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De-aerate boiler feed-water (particularly if large

amount of new water is used). Insure rapid continuous and adequate condensate drainage by properly sized and installed traps and piping. Check traps for sticking. Clean strainers ahead of traps. (When traps don’t work, condensate accumulates in unit heater coil; water hammer results.) Adequately vent each unit. Use lowpressure steam when possible.

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