LENNOX LCH036-150 Blower Proving Switch Kit Instruction Manual
- June 4, 2024
- Lennox
Table of Contents
PACKAGED UNITS KITS AND ACCESSORIES
BLOWER PROVING SWITCH KIT
Instruction Manual
INSTALLATION INSTRUCTIONS FOR BLOWER PROVING SWITCH KIT (603364-36, 21Z10)
USED ON PACKAGED LG/LC/LH/LD 024-300(S) UNITS
Shipping and Packing List
Package 1 of 1 contains:
1- Air flow switch (S52)
1- Airflow fitting
1- Airflow tubing
2- Screws
Application
The Blower Proving Switch Kit is used on LG/LC/LH/LD 024-300(S) (3 to 25 ton)
units.
The normally open S52 air flow (blower proving) switch will close with an
increase in static pressure when the blower is started.
Units that contain a Unit Controller will keep the heating and cooling
functions locked out and also show an alarm in the system if the blower is not
sensed. S52 is found on the “C” or control wiring diagram section in the unit.
CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can
result in a personal in jury. Take care while handling this equipment and
wear gloves and protective clothing.
Unit Controller Settings
The blower proving switch is controlled by the Unit Controller. Use the
following appropriate menu to enable the blower proving switch function.
M2 Unit Controller:
Go to Settings > Install >Blower Proving Sw M3 Unit Controller:
Go to Setup > Install and navigate through the various setup questions until
Configuration ID 2 appears.
Position one needs to be set to either C for installation on M3 Unit
Controller or D for installation on the DDC controller.
M4 Unit Controller:
Use the mobile app and go to RTU MENU > SETUP INSTALL and navigate through the
various setup questions until Configuration ID 2 appears. Position one needs
to be set to either C for installation on M4 Unit Controller or D for
installation on the DDC controller.
NOTE – Refer to the Unit Controller manual provided with each unit.
Installation
- Open blower access doors and disconnect all electrical power to the unit.
- Cut air flow tubing to 2” for 024-072 and 156-300(S) units. Use length provided for 092-150 units.
- Assemble air flow switch, tubing, and fitting as shown in figure 1.
- Install switch assembly as shown in table 1. Snap the air flow fitting into the keyed hole. Secure the switch with two screws.
TABLE 1
| Unit | Figure |
|---|---|
| LGH/LCH036-150 | Figure 2 |
| LGM/LCM036-074 | Figure 3 |
| LG/LC 092-150 | Figure 4 |
| LG/LC 156-300(S) | Figure 5 |
| LGT/LHT/LCT/LDT024-072 | Figure 6 |
WARNING
Improper installation, adjustment, alteration, ser vice, or maintenance can
cause property damage, personal injury, or loss of life. Installation and ser
vice must be performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
|
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|
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Wiring
Locate the wires hanging near the blower proving switch labeled “S52”. Connect
wires to the blower proving switch terminals. See figure 7 for 024-150 units
and figure 8 for 156-300S units.
506205-02
5/2022
Supersedes 4/2021