Instruction/ maintenance manual of the product 51M32 Lennox International Inc.
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Page 1 ® 2003 Lennox Industries Inc. Dallas, T exas, USA OPERA TION MANUAL Merit R Series Thermost at The Lennox Merit ® Series Thermostat 51M32 is a nonpro- grammable electronic thermostat that is easy-to-use and has a large, easy-to-read display and excellent tempera- ture control.
Page 2 Display − Home Screen Figure 2 ROOM 70 FA N AUTO SYSTEM HEA T Figure 2 illustrates the HOME screen. Note that an indoor room temperature of 70°F is initially displayed. After about 1 minute of warm−up time, the actual room temperature will be displayed.
Page 3 Figure 6 Heating Demand ROOM 72 88 FA N AUTO SYSTEM HEA T When the actual temperature rises above the temperature setpoint, the flame icon will disappear . This indicates that th e heating demand has been satisfied and that the heating equipment has been turned off.
Page 4 Fan Control The F AN button is located behind the small door on the right-hand side of the thermostat. See figure 3. The F AN button can be used to select either continuous fan mode or auto fan mode. If continuous fan mode is enabled, the fan will run continu- ously regardless of whether the heating or cooling equip- men t is running.
Page 5 Service Indicator When abnormal equipment operation is detected, the SER VICE indicator will flash on the upper-right corner of the screen. This indicates that the equipment requires ser- vice from a qualified service technician. The SER VICE indi- cator is shown in figure 13.
Page 6 Equipment Protection Override Both the minimum compressor OFF timer and the mini- mum equipment cycle timer can be over−ridden by press- in g and holding either the HEA T or COOL button down for 4 seconds. Over−T emperature Protection Thermal mechanical switch opens W1 at 93°F+/−6°F .
Page 1 ® 2003 Lennox Industries Inc. Dallas, T exas, USA OPERA TION MANUAL Merit R Series Thermost at The Lennox Merit ® Series Thermostat 51M33 is a nonpro- grammable electronic thermostat that is easy-to-use and has a large, easy-to-read display and excellent tempera- ture control.
Page 2 Display − Home Screen Figure 2 ROOM 70 FA N AUTO SYSTEM HEA T Figure 2 illustrates the HOME screen. Note that an indoor room temperature of 70°F is initially displayed. After about 1 minute of warm−up time, the actual room temperature will be displayed.
Page 3 Figure 6 Heat Mode Disabled ROOM SETPOINT 69 64 FA N AUTO SYSTEM OFF Heating Demand The thermostat must be in either normal or emergency heat mode in order to properly control the heating equip- ment.
Page 4 Setpoint Display and Adjustment Figure 9 ROOM SETPOINT 69 64 FA N AUTO SYSTEM HEA T Aft e r the desired setpoint is reached, the HOME screen will reappear after about 8 seconds. Fan Control The F AN button is located behind the small door on the right-hand side of the thermostat.
Page 5 Figure 13 Display of Filter Reminder ROOM 72 FIL TER FA N AUTO SYSTEM HEA T Balance Point NOTE − The balance point is only available with the out- door sensor . If the optional outdoor sensor (X2658) is connected to the thermostat, ba l ance point adjustment is available.
Page 6 Default Thermostat Settings Default Thermostat settings are in table 1. T able 1 Default Thermost at Settings Mode Heat Setpoint 70°F (or 21°C) Fan Auto Filter Reminder OFF (reminder setting .
Page 7 Service Reminder The SE RVICE indicator is displayed only under the follow- ing conditions: if the thermostat Y1 terminal has been activated with 24V AC for at least 5 minutes, AND the L te.
Page 8 T able 3 Thermostat Output S tates Condition W1 Y1 G O E Electric Heat Backup − No Out door Sensor small heat demand X X large heat demand X X X emergency heat demand X X cool demand X X X no.
An important point after buying a device Lennox International Inc. 51M32 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Lennox International Inc. 51M32 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Lennox International Inc. 51M32 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Lennox International Inc. 51M32 you will learn all the available features of the product, as well as information on its operation. The information that you get Lennox International Inc. 51M32 will certainly help you make a decision on the purchase.
If you already are a holder of Lennox International Inc. 51M32, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Lennox International Inc. 51M32.
However, one of the most important roles played by the user manual is to help in solving problems with Lennox International Inc. 51M32. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Lennox International Inc. 51M32 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
