LENNOX M1-5 Commercial Training Toolbox Tips User Guide
- October 30, 2023
- Lennox
Table of Contents
LENNOX M1-5 Commercial Training Toolbox Tips
Product Information
Commercial Training Toolbox Tips
The Commercial Training Toolbox Tips provide guidance and advice on how to test system cooling and heating on M1-5 through M1-8 controller. The product also offers self-service technical support with no wait times. Customers can download the Training Toolbox Tips app and register for technical training webinars by clicking on the black logos below.
COM-01-050 is a specific training tip that guides users on how to test blower and condenser fan operation. However, it is important to note that these steps only test operation and do not follow the sequence during a normal cooling call.
Product Usage Instructions
How to Test System Cooling and Heating on M1-5 through M1-8 Controller
Follow the steps below to test the blower and condenser fan operation:
- Locate the M1-5 through the M1-8 controller.
- Turn on the power supply to the controller.
- Press the “Cool” button on the controller.
- Check if the blower turns on. If it does not, turn off the power supply and check the wiring connections.
- Check if the condenser fan turns on. If it does not, turn off the power supply and check the wiring connections.
- If both the blower and condenser fan turn on, turn off the power supply and repeat the test for the “Heat” button.
It is important to note that these steps only test operation and do not follow the sequence during a normal cooling call. For more detailed instructions, refer to the product user manual or contact technical support.
Operations
IM’C Two-stage Thennostat Simulation Test
The IC simulates two-stage thermostat inputs to check unit operation. In the test mode, thermostat inputs and zone sensor control are ignored by the M1-8.
- Move the MODE DIP ‘SHIFT to ON. Make sure the decimal point is to the right of the readout.
- Move the MODE DIP “UNIT TEST” to “ON* (see figure 54). For a few seconds only a decimal point will be dis- played. Then a “c01° will be displayed simulating a thermostat input.
- Use the pushbutton to toggle the readout downward from “01 To “s01. A double push will toggle the read-out upward from “S01* To c01. Table 34 shows testing puts on two-stage units (ECTO 5.04 set to 1 or 2). Table 35 shows test inputs for three-stage units (ECTO 5.04 set to 3).
- NOTE: when a cooling stage is de-energized, all lower stages are de-energized simultaneously.
- Press and hold the pushbutton to turn “ON” an output. A decimal indicates the output is energized. Press and hold the push button until the decimal disappears. This indicates the output is tumed “OFF” (see figure 55).
Example: To check compressor operation:
- Set MODE DIP to “SHIFT”. Set MODE DIP to “UNIT TEST”.
- With a short push, toggle the pushbutton until °c 11″ is indicated.
- Press the push button until decimals appear; all compressors will be energized.
NOTE: Units may have more than one compressor per stage of cooling. Refer to unit wiring schematic to determine which compressors are energized by first- and second-stage cooling demands.
Turning off the MODE DIP “UNIT TEST” and MODE DIP “SHIFT” returns unit to normal operation and resets all delays except blower-off delays used with compressor operation. Reset power to digital temperature control modules once tests are complete. This will reset any alams which may have been caused by testing.
Below are the steps to test blower and condenser fan operation. Please note these only test operation and do not follow the sequence during a normal cooling call.
Check unit functions as follows
- Move the MODE DIP “UNIT TEST” to ON (see Figure 48). The readout will display “O” indicating a blower out- put (see Figure 49).
IMC MANUAL OUTPUT TEST
The IMC board provides analog and digital test outputs to check the operation of the unit functions shown in table 33. See the Modulating Gas Valve section to test the operation.
Table 33: Testing Outputs
