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L4029E

resideo L4029E User manual

  • Hello! I've reviewed the installation instructions for the resideo L4029E and L4029F Limit Controls. This document provides guidance on how to mount and wire these devices for use in warm air and air conditioning systems and how to use as a safety device when a fire is detected. I'm ready to answer your questions about the installation and features of these limit controls.
  • What is the difference between L4029E and L4029F?
    Where should the L4029E or F be mounted?
    How do I reset the limit control after it has tripped?
INSTALLATION INSTRUCTIONS
60-0069-03
L4029E,F Limit Controls
APPLICATION
The L4029E,F provides high limit cutout with manual
reset in warm air or air conditioning systems. In warm
air systems, the L4029E,F may be used as secondary
high limits for positive burner shutdown on fan failure, or
on reverse airflow in counterflow furnaces. The limits
may also be used to detect heat from a fire in air
conditioning or ventilation ducts and shut off air
circulation to contain the fire. The L4029E comes with
case and cover, the L4029F without case and cover. Both
mount directly to the ductwork.
INSTALLATION
CAUTION
1. Installer must be a trained, experienced
service technician.
2. Disconnect power before connecting wiring to
prevent electrical shock and equipment
damage.
Location
L4029E or F should be mounted where element can
respond quickly to air temperature changes in the
system. In a ventilating or air conditioning installation,
the safety control is normally installed with element just
upstream of fan. Where there is no intake duct, the
L4029E or F may be mounted on a suitable bracket so
the air entering the fan is drawn across the element. In a
downflow furnace installation, locate the L4029E or F
between filter(s) and blower where the circulation of air
is not restricted by baffles. Do not permit element guard
to touch filter or other internal parts.
The maximum ambient temperature of the selected
location should not exceed 190 F at switch, 350 F at
bimetal.
Mounting
Fig. 1. Mounting and case dimensions in inches for
L4029E.
Fig. 2. Control dimensions.
7/16
(11)
1/32 (1)
1/32 (1)
1-1/2 (38)
2-5/16 (59)
3/16 (5) MOUNTING
HOLES IN BACKPLATE
SHEET METAL
OPENING SIZE
2-3/4
(64)
3-7/32
(82)
3-3/4
(95)
1/4 (6)
M27074A
1/4 (6)
L4029E,F LIMIT CONTROLS
© 2020 Resideo Technologies, Inc. All rights reserved.
This product is manufactured by Resideo Technologies, Inc. and its affiliates.
www.resideo.com
Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
60-0069—03 M.S. Rev. 06-20 | Printed in United States
Fig. 3. Mounting and backplate dimensions in inches for
L4029F.
At selected location, cut a hole in sheet metal to clear
element guard, and drill holes for mounting screws.
Remove cover (L4029E), insert element into hole, and
fasten control securely with screws.
WIRING
CAUTION
Disconnect power before making wiring
connections to prevent electrical shock and
equipment damage.
All wiring must agree with local electrical codes and
ordinances. See typical connections below.
Loads connected to the control terminals must not
exceed the following electrical ratings (in amperes):
0.25 amp full load at 0.25 to 12VDC.
1600 VA maximum connected load.
Fig. 4. Typical diagram of L4029E or F in gas-fired
downflow furnace circuit.
Fig. 5. Typical diagram of L4029E or F in ventilating fan
circuit.
Fig. 6. Typical diagram of L4029E or F in oil-fired
downflow furnace circuit.
CHECKOUT
There are no field adjustments to make on the L4029E
or F.
To Reset
When the temperature has dropped approximately 25
degrees (F) below cutout point, push and release the
button protruding through the cover.
1. If the limit control should require servicing or
replacement, be sure to order by model number.
2. Never use a lighted match to heat the bimetal ele-
ment for checking the operation.
3. Limit controls do not require lubrication.
Before leaving the job, check the installation as follows:
1. Disconnect the fan from its power supply.
2. Turn on the burner by operating the thermostat.
3. The L4029 will shut off the burner when the ple-
num temperature reaches the limit setting of the
control.
4. If the L4029 fails to shut off the burner, check the
installation and wiring carefully. Retest. If control
still fails to shut off burner, replace control.
Table 1. Electrical Ratings.
30 VAC 120 VAC 240 VAC
Full Load 2 10 5
Locked Rotor — 60 30
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
1
FAN MOTOR
L4029E, F
FAN TIMER
OR CONTROLLER
(IF USED)
L1
L2
M38428
/