Reznor EHA3 Installation Manual

Reznor LLC / O’Fallon MO USA 63368

Tel.: [phone] / www.ReznorHVAC.com

© 2014 Reznor LLC. All rights reserved. All other trademarks are

the property of their respective organizations.

INSTRUCTIONS ‘‘EHA’’ Model

WARNING

When using electrical appliances, basic precautions should
always be taken to reduce the risk of fi re, electrical shock and
injury, including the following.

Read carefully these instructions before installation, operation
of the heater. Failure to adhere to the instructions could result in
fi re, electric shock, serious personal injury, and death or property
damage. Review frequently for continuing safe operation and
instruction of future users, if necessary.

IMPORTANT
INSTRUCTIONS

1- Read all instructions before installing or using this heater.
2- This heater is hot when in use. To avoid burns, do not let
bare skin touch hot surfaces. Keep combustible materials,
like furniture, pillows, bedding, papers, clothes, and
curtains at least 36 in. (915 mm) from the front of the heater.
3- Extreme caution is necessary when any heater is used by
or near children or invalids and whenever the heater is left
operating and unattended.
4- Do not operate any heater after it malfunctions. Disconnect
power at service panel and have heater inspected by a
reputable electrician before reusing.
5- Do not use outdoors.
6- Do not insert or allow foreign objects to enter any
ventilation or exhaust opening as this may cause an electric
shock or fi re, or damage the heater.
7- Do not block air intakes or exhaust in any way whatsoever.
8- This heater has hot and arcing or sparking parts inside.
Do not use it in areas where gasoline, paint, or fl ammable
liquids are used or stored.
9- Use this heater only as described in this manual. Any other
use not recommended by the manufacturer may cause fi re,
electric shock, or injury.
10- Models up to 6000W maximum and 240V maximum:
These heaters include a visual alarm to warn that parts of
the heater are getting excessively hot. If the light turns on,
immediately turn the heater off and inspect for any objects
on or adjacent to the heater that may have blocked the
airfl ow or otherwise caused high temperatures to have
occured. If no obstruction is visible, the heater must be
checked by a qualifi ed person. DO NOT OPERATE THE
HEATER WITH THE ALARM LIGHT IS ON.
11- The thermostat should not be considered as an infallible device
in case where maintaining a temperature is considered critical.
Examples: Hazardous material storage, computer server room,
etc. In these particular cases, it is imperative to add a monito­ ring system to avoid the consequences of a thermostat failure.

OPERATING
INSTRUCTIONS

1- The heater must be properly installed before it is used.
2- Turn the power on at the circuit breaker panel.
3- Electronic thermostat: be sure to set it on the fan mode.
4- Built-in tamperproof thermostat: to set thermostat at the
desired temperature, follow these steps:

- The setting can be done through the hole in the front cover
with a small slotted screwdriver.

- Set thermostat at maximum temperature (turn clockwise).

- When the desired temperature is reached, turn the
thermostat counter-clockwise slowly until you hear
a click.

- The thermostat will keep this room temperature.
5- Models up to 6000W maximum and 240V maximum:
These heaters include a visual alarm to warn that parts
of the heater are getting excessively hot. If the light turns on,
immediately turn the heater off and inspect for any objects
on or adjacent to the heater that may have blocked the
airfl ow or otherwise caused high temperatures to have
occured. DO NOT OPERATE THE HEATER WITH

THE ALARM LIGHT IS ON.

OPTION:
Fan switch:

This option allows the use of the fan in continuous or automatic
mode.
The switch can be switched through the upper grille with a
screwdriver.
Position ON: The fan runs continuously, with or without heating
demand.
Position AUTO: The fan operates in automatic mode, only during a
heating demand.

MAINTENANCE
INSTRUCTIONS

1- Once a year, remove the front panel and use a vacuum
cleaner to remove the dust accumulation inside the heater
and through openings of the front panel.
2- Cleaning should be done while the heater is disconnected
from the main service panel. Wait until the housing
and heating element cool before performing maintenance.
3- Replace the front panel before energizing.
4- Any other servicing should be performed by a qualifi ed
technician.

WARRANTY

The manufacturer warrants the component parts of its products
against defects in material and workmanship for a three (3) year
period following the date of purchase, under normal use and service,
when proof of purchase of such is provided to the manufacturer. The
obligation of the manufacturer, under the terms of this warranty,
will be to supply a new unit and this releases the manufacturer from
paying the installation costs or other secondary charges linked to
replacing the unit or the component part(s).

SAVE THESE
INSTRUCTIONS

INS269-200405-06

INSTALLATION INSTRUCTIONS

RECESS MOUNTING:

1- Heater must be used with recess box.
2- Never install warm air outlet of heater less than
10 in. (250 mm) from fl oor or adjacent wall.
3- Provide a wall opening as:
Depth : 4 5/16 in. (109 mm)
Height : 19 7/8 in. (506 mm)
Length : - Single unit : 14 7/16 in. (368 mm)

- Double unit : 30 3/16 in. (767 mm)

- Triple unit : 46 5/8 in. (1185 mm)
4- Remove the appropriate knock-out from the recess box
for the electrical supply.
5- Attach fi rmly the recess box using provided screws.
Make sure that the edge on each side of the recess box
lean on the drywall and not on the structural parts of the
wall. See marking on the sides of the recess box.
6- Install the heater to the recess box and be sure that the
heater is attach fi rmly with four (4) provided screws.
7- Connect the heater leads to the supply leads according
to national and local codes. See wiring diagram in the
heater.
8- Make sure the fan rotates freely and that there is no
foreign object in the heater.
9- Install the front cover using the provided screws.
IMPORTANT: Make sure that the part of the front cover
without louver is at the top to insure proper air fl ow.
10- To test the heater temporarily, set thermostat at
maximum temperature.

SURFACE MOUNTING:

Model 4 in. (102 mm)

1- The surface box must be used with recess box.
2- Never install warm air outlet of heater less than
10 in. (250 mm) from fl oor or adjacent wall.
3- Locate the power supply leads behind the planned location
of the heater (surface box).
4- Mount the surface box securely to the wall with provided
screws.
5- Follow instructions 4 to 10 as above for recess mounting.

See illustration to install properly.

SEMI-RECESSED MOUNTING:

Model 1 in. (25 mm) and Model 2 in. (51 mm)

1- The surface box must be used with recess box.
2- Never install warm air outlet of heater less than
10 in. (250 mm) from fl oor or adjacent wall.

3- Provide a wall opening as:
Depth for 1 in. model : 3 5/16 in. (84 mm)
Depth for 2 in. model : 2 5/16 in. (59 mm)
Height : 19 7/8 in. (506 mm)
Length : - Single unit : 14 7/16 in. (368 mm)

- Double unit : 30 3/16 in. (767 mm)

- Triple unit : 46 5/8 in. (1185 mm)

4- Mount the surface box securely to the wall with provided
screws.
5- Follow instructions 4 to 10 as above for recess mounting.

See illustration to install properly.

CAUTION:

High temperature, risk of fi re, keep electrical cords, drapery,
furnishings, and other combustibles at least 36 in. (915 mm)
from the front of the heater. To reduce the risk of fi re, do not
store or use gasoline or other fl ammable vapors and liquids in
the vicinity of the heater.

IMPORTANT

1- Do not obstruct front of heater
for at least 48 in. (1220 mm).
2- Any remote thermostat or relay must be connected

to the heater control terminal block.
3- Do not interrupt power supply to control this heater.

Surface mounting and
Semi-recessed mounting
Single unit

Surface mounting and
Semi-recessed mounting
Double unit

Surface mounting and
Semi-recessed mounting
Triple unit