Reznor EXUB Unit Installation Manual - Manual (Page 4)

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— 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 ground-
ed 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 °C (104°F).
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 en-
closures 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.
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.