Reznor EWHB User manual

23-2180-83-5REZ
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

EWHB Series Industrial / Commercial Electric Unit Heater /Warnings, Page 1 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.
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.
WARRANTY WILL BE VOID IF INSTRUCTIONS ARE NOT FOLLOWED.

EWHB Series Industrial / Commercial Electric Unit Heater /Installation Instructions, Page 1 of 4 23-2180-83-5REZ
INSTALLATION INSTRUCTIONS
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 :
FIGURE 1
Small room with one exposed wall:
EXPOSED WALL
FIGURE 2

EWHB Series Industrial / Commercial Electric Unit Heater /Installation Instructions, Page 2 of 4 23-2180-83-5REZ
INSTALLATION INSTRUCTIONS –Continued
B. Mechanical Installation:
These heaters are to be mounted for horizontal discharge
only. Mounting is to be accomplished by using either (4)
3/8x16 threaded rods (supplied by others) or the stainless
steel swivel mounting bracket factory supplied with the
heater. 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.
The supporting structure that the heater is attached to
must have adequate strength to safely support the heater.
The heater dimensions and maximum unit weights are:
TABLE 1:
KW
Cabinet
Size
X
Y
Z
Weight
<= 12
1
15.50”
(394mm)
21.50”
(546mm)
13.00”
(330mm)
56 lbs
(25 kg)
12.1 to 47
2
26.00”
(660mm)
28.00”
(711mm)
20.00”
(508mm)
115 lbs
(52 kg)
Select a location for installation such that the outlet air is
not directed at an adjacent wall. Louvered grills can be
installed to deflect the discharge air up, down or sideways.
TABLE 2:
KW
Cabinet
Size
Air Volume
Air
Throw
Outlet
Velocity
<= 7.5
1
700 CFM
(1189 cubic m/hr)
26 Ft
(8 m)
760 FPM
(232 m/min)
7.6 to 12
1
1450 CFM
(2463 cubic m/hr)
43 Ft
(13 m)
1575 FPM
(481 m/min)
12.1 to 47
2
2400 CFM
(4077 cubic m/hr)
50 Ft
(15 m)
1200 FPM
(366 m/min)
Once an acceptable location has been determined, see the
following instructions to complete the mechanical
installation:
1. To ensure proper heating of floor surfaces, observe
the following recommended mounting height
limitations (to bottom of heater):
TABLE 3: Max. Mounting Height from Floor, feet (m)
<= 5 KW
5.1 to 10
KW
10.1 to 20
KW
20.1 to 47
KW
10’ (3m)
15’ (4.6m)
20’ (6.1m)
25‘ (7.6m)
2. Install the heater at least 6 feet (1.8m) from the floor
and 8” (203mm) from the wall or ceiling.
3. Mount heater using one of the following two options:
Standard ceiling or wall mount using the swivel bracket:
MOUNTING HOLE DETAIL-
REAR VIEW OF BRACKETS
FIGURE A
(1-12KW)
FIGURE B
(12.5-47KW)
(See Table 4 on next page for tabulated dimensions)

EWHB Series Industrial / Commercial Electric Unit Heater /Installation Instructions, Page 3 of 4 23-2180-83-5REZ
INSTALLATION INSTRUCTIONS –Continued
Ceiling or wall mount using swivel bracket (cont):
TABLE 4:
KW
BH
BL
M
<= 12
4.25”
(108mm)
19.50”
(495mm)
8.50”
(216mm)
12.1 to 47
7.125”
(181mm)
22.25”
(565mm)
3.25”
(83mm)
Optional Ceiling Installation using 4 threaded rods:
For ceiling installation using threaded rods, secure the
four rods to the ceiling using locknuts.