WARNING: Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property.
Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency. This thermostat, 5/2 day programmable electronic thermostats provide excellent temperature control and have a large, easy to read display. Also provided is a programmable filter-change reminder, an equipment maintenance reminder, and a system check indicator. The system check indicator will notify the user when the equipment requires service.
Thermostat model L3511C is suitable for non‐heat pump, single stage heat/single stage cool applications using a gas or electric furnace.
Thermostat model L3522C is suitable for non‐heat pump, two‐stage heat/two‐stage cool applications using a gas or electric furnace.
Thermostat model L3532H is suitable for heat pump, three‐stage heat/two‐stage cool applications using a gas or electric auxiliary heat source. An optional outdoor temperature sensor provides auxiliary heat lockout, balance point operation, and dual-fuel compatibility.
General
These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation.
Check equipment for shipping damage. If you find any damage, immediately contact the last carrier.
Shipped With Product
Optional Accessories
IMPORTANT Read all of the information in this manual before using this thermostat. All wiring must conform to local and national building and electrical codes and ordinances. This is a 24VAC low-voltage thermostat. Do not install on voltages higher than 30VAC.
Be sure that power routed to the thermostat has been powered off before beginning installation. This thermostat should be used only as described in this manual. Do not install the thermostat on outside walls (where there is unconditioned space on opposite side of wall) or in locations where direct sunlight may be present.
Install thermostat about 5 feet up from the floor.
CAUTION Do not short (jumper) across terminals on the gas valve or at the system control to test installation. This will damage the thermostat and void the warranty.
NOTE – If this thermostat is replacing an existing thermo-stat, carefully label the existing thermostat wires so that they can be identified later.
Removing Thermostat
The thermostat hinges on tabs on the top of the subbase. After installation is complete, no tool is needed to remove the thermostat from the subbase. Pivot the bottom of thethermostat outward (releasing the snaps), then lift up to remove.
Table 1. L3511C Terminal Designations
Terminal | Description |
R | 24VAC |
Y1 | First stage cooling |
W1 | First stage heating |
G | Fan control |
L | Service Indicator |
C | 24VAC common |
Table 2. L3522C Terminal Designations
Terminal | Description |
R | 24VAC |
Y1 | First‐stage cooling |
W1 | First‐stage heating |
Y2 | Second‐stage cooling |
W2 | Second‐stage heating |
G | Fan control |
L | Service Indicator |
C | 24VAC common |
Table 3. L3532H Terminal Designations
Term. | Description |
B | Reversing valve, heat active |
O | Reversing valve, cool active |
R | 24VAC |
Y1 | First‐stage cooling/heating, compressor energized |
W1* | Auxiliary heating, furnace energized |
Y2 | Second‐stage cooling/heating, compressor energized |
E* | Emergency heat |
G | Fan control |
L | Service Indicator |
C | 24VAC common |
T | Outdoor temperature sensor connection 1 |
T | Outdoor temperature sensor connection 2 |
* For most applications, E will be jumpered to W1. If sep arate wires are not provided for both E and W1, jumper the E terminal to the W1 terminal on the thermostat sub base. For applications involving the use of a balance point (whereby the outdoor temperature is to be used to restrict either heat pump operation or backup heat source operation), the optional outdoor sensor (part number X2658) MUST be installed. |
NOTE: The thermostat heating mode will not operate if the thermostat has been stored or is being used at ambient temperatures that are above 93°F. The heating function will be enabled after the thermostat is exposed to ambient temperatures below 93°F for about 30 minutes.
DIP Switch Settings
L3511C, L3522C, and L3532H thermostats include six DIP switches which are located on the back side of the thermostat body. These switches may be used to re-calibrate the thermostat (Cal 1, Cal 2 and Cal±) and to select the ther mostat display (Fahrenheit or Celsius). Thermostats L3511C and L3522C also include a DIP switch used to select fan operation for either electric heat or gas heat applications.
Thermostat L3532H includes a DIP switch used to indicate whether electric or gas back-up heat will be used. Also, SSR (Smart Setback Recovery) can be enabled or disabled. When enabled, this feature provides additional comfort when changing from one program period to the next. If SSR is disabled, the HVAC equipment will respond to a program change at the time the change is set to occur.
However, if SSR is enabled, the HVAC equipment will respond to a program change before the change is set to occur. Refer to table 4 for DIP switch function descriptions.
Table 4. DIP Switch Function Description
Designation | Description | Off | On | Factory Setting |
1- Cal 1 | Room Tempera ture Offset: 1°F | 0°F | 1°F | 0°F |
2- Cal 2 | Room Tempera ture Offset: 2°F | 0°F | 2°F | 0°F |
3- Cal +/- | Room Tempera ture Offset: Sign | Posi tive | Nega tive | Positive |
4- F/C | Select Fahren heit or Celsius Display | F | C | F |
5- Fan Option (L3511C or L3522C only) | Select Heating Fan Operation: Electric (E) or Gas (G) | G | E | G |
5- Backup Heat (L3532H only) | Select Heat Backup: Electric (Aux) or Gas (Dual) | Aux | Dual | Aux |
6- SSR | Enable or Dis able Smooth Set back Recovery | Dis able | En able | Disable |
Table 5. DIP Switch Temperature Offset
Cal 1 | Cal 2 | Cal +/- | Temperature Offset |
Off | Off | Off | +0°F (no offset) |
On | Off | Off | +1°F |
Off | On | Off | +2°F |
On | On | Off | +3°F |
Off | Off | On | -0°F (no offset) |
On | Off | On | -1°F |
Off | On | On | -2°F |
On | On | On | -3°F |
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Lennox L3511C 5/2 Days Programmable Thermostat Installation Instruction
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