Reznor EWHB Installation Manual

EWHB Unit Heaters

Washdown / Corrosion Resistant

Industrial / Commercial Electric Unit Heater

Owner’s Manual

This manual covers installation, operation and maintenance. Read carefully before attempting to

install, operate or service the EWHB Series Unit Heater.

IMPORTANT INSTRUCTIONS

SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE

Reznor, LLC

O’Fallon, MO 63368 • USA

800-695-1901

www.reznorhvac.com

23-2180-83-5REZ

IMPORTANT INSTRUCTIONS

Installation and maintenance personnel should familiarize themselves with this manual and all the
IMPORTANT INSTRUCTIONS before installing or working on this heater to avoid potential unsafe
conditions, severe property damage, personal injury or death.

1. Read all instructions before installing and
operating this heater.

2. Verify that the supply voltage and phase to
the heater matches the nameplate rating
before energizing.

3. Potentially lethal voltages are present. Be
sure to lock the branch circuit disconnect
switch in the OFF position and tag the

circuit “Out for Maintenance” before

working on this equipment.

4. Keep electrical enclosure cover tightly
closed while in operation.

5. Hazard of Electric Shock. Heater must be
grounded in accordance with both local and
national codes.

6. This heater should be installed by a licensed
electrician familiar with all applicable
national and local codes having jurisdiction.
It is the responsibility of the installer to
verify the safety and suitability of the
installation.

7. Disassembly of the unit for installation is
not required or authorized.

8. Replacement electrical components must
be obtained from the factory in order to
maintain any applicable Agency Listings.

9. Use this heater only as described in this
manual. Any other use is not recommended

by the manufacturer and may result in fire,

electric shock or personal injury.

10. The heater and discharge air are hot when
in use. To avoid burns, do not let bare skin
touch hot surfaces.

11. To prevent a possible fire, do not block or
allow foreign objects to enter air intakes or
exhaust in any manner.

WARRANTY WILL BE VOID IF INSTRUCTIONS ARE NOT FOLLOWED.

12. Risk of fire due to high temperatures. Keep
electrical cords, drapery, furnishings,
insulation and other combustibles at least 3
feet (0.9m) from the front of the heater and
away from the sides, rear and top.

13. Installation minimum mounting clearances
specified both on heater nameplate and in
this owner’s manual must be maintained.

14. Use copper wire rated 90°C min. for supply
connections.

15. This heater should not be used in
potentially explosive atmospheres. Do not
use in areas where gasoline, paint, or
flammable liquids are used or stored.

16. Do not use outdoors. Heater may be
washed down with water for cleaning. Do
not use high pressure cleaning systems.

17. Risk of fire. Do not use as a residential or
household heater.

18. Heater is designed to be controlled by a
room thermostat located within the
operating space that will control the room
temperature below 80°F (26.7°C). Do not
allow heater to cycle on the built-on limit
controls.

19. The heaters are designed for permanent
wall or ceiling mounting in a horizontal
position only.

20. Do not operate heater after it malfunctions.
Disconnect power at service panel and have
heater inspected by a reputable electrician
before reusing.

21. SAVE THESE INSTRUCTIONS.

EWHB Series Industrial / Commercial Electric Unit Heater /Warnings, Page 1 23-2180-83-5REZ

INSTALLATION INSTRUCTIONS

FIGURE 1

EXPOSED WALL

FIGURE 2

RISK OF FIRE / EXPLOSION



This heater should not be used in potentially explosive atmospheres. Do not use in areas where gasoline,
paint or flammable liquids are used or stored.

 Keep electrical cords, drapery, furnishings, insulation and other combustibles at least 3 feet (0.9m) from the

front of the heater and away from the sides, rear and top.

 Installation minimum clearances specified both on the heater nameplate and in the owner’s manual must be

maintained.

 Do not use as a residential or household heater.

These air heaters are designed for comfort heating and
should not be used in ambient temperatures exceeding
80ºF (26.7ºC). They are to be permanently mounted to the
wall or ceiling for horizontal discharge. The unit is
designed to give years of safe, trouble-free operation
when properly installed and maintained.

A. Site Selection:

The heaters are intended for elevated mounting locations
so that they blow warm air down to the floor area. A
mounting height should be selected so that the heater is
out of the way of possible moving equipment or
personnel, yet low enough to deliver warm air to the
selected area. See the mechanical installation section for
recommended installation heights.
Heater airflow should be directed to areas of greatest heat
loss. In general, greater numbers of small heaters will
provide more uniform and even heat distributions than a
few large ones. In order to help move heated air around
the room, multiple heaters should be spaced out and
direct air in a circular pattern around the room perimeter
such that each heater supports the next heater’s
airstreams. See Figures 1 & 2 for some typical airflow
pattern arrangements:

Large room with exposed walls and roof :

Small room with one exposed wall:

EWHB Series Industrial / Commercial Electric Unit Heater /Installation Instructions, Page 1 of 4 23-2180-83-5REZ