Reznor EXUB Installation Manual

EXUBEXUBEXUB

Explosion Resistant Unit Heater

Owner’s Manual

This manual covers installation, maintenance,

repair, and replacement parts.

Forced-Air Heater for Hazardous Locations

Class I, Divisions 1 & 2, Groups C & D

Class II, Divisions 1 & 2, Groups F & G

Temperature Code T3B

————————————————————————————————————-

Class I, Zones 1 & 2 , Groups IIA & IIB, T3

WARNING!

Please adhere to all instructions published in this manual.

Failure to do so may be dangerous and may void your warranty.

Note: EXUB heaters should not be exposed to rain or snow. This applies to installed & stored heaters.

The EXUB heater should not be modified in any way.

(35 kW = T3A)

235730

www.RezSpec.com

Printed in Canada

Part No. RZ-I-EXUB (B)

EXUB Model Coding

EXUB 10 AK7E Options - A

Model Code Sequence

Factory Assigned

Model Series

Power Output

5 kW 5

7.5 kW 10 kW 15 kW 20 kW 25 kW 30 kW 35 kW 35

7 10 15 20 25 30

12 inch fan size

16 inch fan size

20 inch fan size

* 120 Volt Control Circuit is standard

EXUB Physical Dimensions

G max

11"

[279]

3/4" NPT, External thermostat entry

0.375" [10]

1" NPT, Main electrical entry for disconnect option

1" NPT, Main electrical entry no disconnect fitted

3.75"

8.4"

[214]

5.0"

[127]

[95]

4 x Ø 9/16" [14] mounting holes

2.25" [57]

3.375" [86]

Louvres

1.4" [36] max

4.7"

[118]

6.6"

[168]

Heater Size

Dim.

Product Revision No.

For minor revisions

Factory Built-in Options

BT1* 24 Volt Control Circuit

Integral thermostat

IX34

Disconnect switch

BAX1

Heater Line Voltage/Phase

AK2 208 Volt/ 1 Phase

AK5 208 Volt/ 3 Phase AK3E 240 Volt/ 1 Phase AK6E 240 Volt/ 3 Phase AK7E 480 Volt/ 3 Phase AK8E 600 Volt/ 3 Phase

(5-10kW)

Inches

(mm)

7.5

(190.5)

18.19 (462)

16.3

(414)

(483)

19.45 (494)

3.1

(79)

22.25 (565)

(15-20kW)

Inches

(mm)

7.5

(190.5)

22.28 (566)

20.28 (515)

(584)

23.46 (596)

5.1

(130)

22.25 (565)

(25-35kW)

Inches

(mm)

7.5

(190.5)

26.26 (667)

24.29 (617)

(686)

27.44 (697)

7.1

(180)

23.25 (591)

0.25" [6]

3.375" [86]

0.25" [6]

EXUB Specifications By Model Size

Model 5 to 10 kW 15 to 20 kW 25 to 35 kW Fan Diameter in. (mm) 12 (304.8) 16 (406.4) 20 (508.0) Nominal kW 5 7.5 10 15 20 25 30 Air Delivery CFM 400 600 800 1200 1700 2100 3000 m3/hr 680 1019 1359 2039 2888 3568 5097 Approx. Air Velocity FPM 479 718 958 808 1145 916 1309 m/s 2.4 3.6 4.9 4.1 5.8 4.6 6.6

Approx. Horizontal Air Throw ft 15 22 30 33 46 41 61 m 4.6 6.7 9.1 10.1 14.0 12.5 18.6 Motor Power HP (Watts) ¼ (186) ¼ (186) ½ (373) Maximum Mounting Height ft 7 7.5 9.5 10 11 12 15 (to underside of heater) m Approx. Net Weight (without disconnect)

Lbs (kg) (with disconnect)

Approx. Shipping Weight (without disconnect) Lbs (kg) (with disconnect)

EXUB General Specifications

Certification

2.1 2.3 2.9 3.0 3.4 3.6 129 (58.5) 133 (60.3) 161 (73.0) 192 (87.1)

142 (64.4) 146 (66.2) 174 (78.9) 205 (92.9)

188 (85.3) 192 (87.1) 224 (101.6) 261 (118.4)

201 (91.2) 205 (93.0) 237 (107.5) 274 (124.3)

CSA

235730 - Certified to Canadian and U.S. standards

C/US

Class I, Divisions 1 & 2, Groups C & D

Class II, Divisions 1 & 2, Groups F & G

Temperature Code T3B (35 kW =T3A)

Class I, Zones 1 & 2, Groups IIA & IIB, T3

Approvals

North American Hazardous Location Classifications

————————————————————————————————————————

Temperature Code Division System - T3B 165°C (329°F); Zone System - T3 200°C (392°F)

14-gauge (0.075 in.) (1.9 mm) steel. Red epoxy/polyester powder coated with five-stage pretreatment, including iron phosphate.

Split design with close wire spacing. A 3/8 in. (9.5 mm) diameter probe will not enter. Black polyester powder coated.

Cabinet

Cabinet Material

Fan Guard

Louver Blades Anodized extruded aluminum. Conduit Materials & Fittings Plated steel and aluminum alloy for corrosion resistance. Fasteners Zinc plated steel for corrosion resistance. Enclosures Cast aluminum (non-copper alloy) NEMA Type 7 & 9 with O-ring. Mounting Holes 9/16” diameter holes – Four located on the top face of heater.

4.6

Motor/Fan

Heat

Exchanger

Protection

Controls

Load

Isolation

Operating

Limits

Motor Type

Explosion-proof, thermally protected, 1725 RPM permanently lubricated ball bearing type with 56 frame and “easy-off” fan blade replacement feature.

Fan Three-blade aluminum, steel spider and hub with 5/8 in. bore

Heating Elements

Long-life, low watt-density, high grade metal-sheathed

elements. Heat Transfer Fluid Ethylene glycol and water including corrosion inhibitors. Header Material Carbon steel.

Carbon steel shells and carbon steel tubes with copper-free,

roll-formed aluminum fins @ 10 fins per in. Evacuated and sealed. Sprayed

ExCaliber

Core

with black, high heat enamel paint.

Temperature High Limits

One automatic reset rated for 100,000 cycles, and one manual reset. Both

are snap-action bimetal type, open on temperature rise. Pressure Relief High-quality preset 100 psig (689 kPa) stainless steel pressure relief device. Control Circuit Built in 120 V control. Optional 24V control (recommended) is available.

Control Contactor

40 FLA (50 A resistive per pole) Definite Purpose.

Rated for 500,000 mechanical operations. Control Transformer Multitap primary, 120V or 24V secondary. Fuse Protection Thermal delay fuse with spare, .25” Room Thermostat (optional) Built in, explosion-proof thermostat, 40°F to 80°F (5°C to 27°C)

Disconnect Switch (optional)

Built-in, explosion-proof disconnect switch, 600V, 50A max with lock-out fea-

ture. Also available in a wall mount version.

x 1.25” , 120V = 1/4 A, 24V = 1 A.

Ambient Temperature -40°F to 104°F (-40°C to 40°C). Storage: -40°F to 140°F (-40°C to 60°C) Maximum Altitude 10,000 ft (3048 m) above sea level.

— WARNING! —

Read and follow the instructions in this manual. Failure to do so may result in severe or fatal injury.

IMPORTANT SAFETY INFORMATION

1. Heater is to be connected and serviced only by qualified electrician experienced with hazardous location equipment. It is the responsibility of the installer to verify the safety and suitability of the installation.

2. Installation and wiring of the heater must adhere to all applicable codes. Heater must be effectively grounded to eliminate shock hazard.

3. Heater is to be used only in atmospheres having an ignition temperature higher than the heater’s maximum rated operating temperature as shown on the heater data plate. For details of hazardous locations with potential for explosion, refer to the Canadian Electrical Code, Part 1, Section 18 or Articles 500 through 516 of the National Electrical Code.

4. Do not operate heater in ambient temperatures above 40

5. Do not plug heater outlet with gloves, clothing, etc. or operate heater with louvers fully closed.

6. Explosion/Electric Shock Hazard. Disconnect heater from power supply or fuse box before opening enclosures or servicing heater. Lock the switch in the “OFF” (open) position and/or tag the switch to prevent unexpected power application.

7. Operate the heater only while it is permanently mounted in an upright position. Failure to comply will cause overheating of the heat exchanger and shutting down of the unit by tripping the high temperature cutout.

8. This heater is equipped with two bimetal thermal high-limit cutouts, one automatic reset type and one manual reset type. The heater is not to be operated with the high-limit cutouts disabled or disconnected from the control circuit.

9. Keep all electrical enclosure covers tightly closed and secured with all bolts and threads. Cover joints must be clean before replacing covers. Keep away from rain or snow. Heater is for dry indoor use only.

10. All unused threaded openings not used for supply wiring or remote mount room thermostat must be fitted with threaded plugs approved for use in hazardous locations.

11. The heat exchanger is a factory vacuum-sealed unit. Do not attempt to loosen or tighten the vacuum plug or pressure relief device. A loss of vacuum could cause nuisance tripping of the thermal cutouts or high pressures which will cause the relief device to actuate with an accompanying loss of fluid.

12. The heat exchanger is filled with a mixture of water and inhibited ethylene glycol which is poisonous. Contact with the fluid at operating temperatures may produce a burn hazard. Suggested first aid consists of flushing eyes with plenty of water and to wash off skin in flowing water or shower. If any fluid leakage occurs from the heater, disconnect it from the power supply and have the heat exchanger replaced with a factory supplied unit.

°C (104°F).

13. Heater must be kept clean. When operating in a dirty environment, regularly clean the fin tubes, fan, and fan guard. Refer to recommended maintenance procedures.

14. Do not operate heater in atmospheres which are corrosive to aluminum or steel.

15. See applicable electrical codes for seal requirements in field installed conduits. Factory installed conduits require no further sealing.

16. Crackling or pinging noises within the heat exchanger during start up may occur. This is normal.

17. Air discharge at the bottom of the heater may be warmer than at the top. This is normal.

18. Do not attempt to install a Remote Fan Only Switch. Do not modify the heater in any way.

19. Use factory approved replacement parts only.

20. Contact factory for any questions or concerns.

— WARNING! —

Read and follow the instructions in this manual. Failure to do so may result in severe or fatal injury.

— INSTALLATION —

Mechanical

Location

Please follow guidelines below for optimum heating results:

1. Do not install heaters such that airflow is blocked or impeded by equipment or walls.

2. For occupant comfort, position heaters so that air discharge is directed across areas of highest heat loss, such as doors, windows, and outside walls.

3. For large areas, arrange heaters such that the air discharge of one heater is directed towards the inlet of the next heater. This sets up a rotational airflow with air circulation in the central area of the building.

4. For equipment freeze protection, direct air discharge at equipment.

5. For large workshops or warehouses it may be acceptable to use fewer, larger heaters.

6. Locate remote mount room thermostat on interior partition walls or posts away from cold drafts, internal heat sources, and away from heater discharge air streams.

Mounting

1. A variety of mounting brackets are available from the factory to aid in installation.

2. The heater is designed to be installed in an upright and level position. All models should not be more than ±15 degrees or 2.5 in. (63.5 mm) from level when measured front-to-back, and ± 5 degrees 1.7 in. (43.2 mm) on 5 to 10 kW models, 2.0 in. (50.8 mm) on 15 to 20 kW models, and 2.4 in. (60.9 mm) on 25 to 35 kW models from level when measured side-to-side. Failure to comply will cause high limit shut down. Refer to heater data plate for tilt angles.

3. If using mounting hardware or a supporting structure not supplied by the factory, the unit should be suspended through the four 9/16 in. (14 mm) mounting holes on top of the unit with 1/2 in. UNC bolts. Lock washers should be used on all mounting nuts and bolts to ensure they don’t vibrate or work loose due to fan vibration or other vibration transmitted to the heater. If in doubt consult factory.

4. It is essential that adequate structural support be provided for installation. The mounting structure must be strong enough to support the heaters weight, provide sufficient stiffness to prevent excessive vibration, and withstand all probable abusive situations such as transportable installations where truck offloading impacts, etc. may occur. Refer to table on Page 3, EXUB Specifications by Model Size, for heater net weights.

Mounting Heights and Clearances

1. To ensure that warm air reaches the floor observe the recommended maximum mounting heights in table on Page 3, EXUB Specifications by Model Size. Heaters may be mounted at higher elevations and still provide warm air at floor level however, the maximum mounting elevation at which this occurs depends on location and operational conditions.

2. Louvers may be adjusted to provide greater downward deflection of the discharge air. However, louvers must not be set less than 30 degrees of the closed position.

3. Leave at least 10 in. (254 mm) clearance between the rear of the motor and the nearest obstruction.

4. For easy removal of the core, leave clearance beneath the heater equal to the height of the heater cabinet plus 2 in. (51 mm).

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