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Lennox International Inc. 51M32 - page 1
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. The thermostat also includes a programmable filter change r ...
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Lennox International Inc. 51M32 - page 2
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. HEA T mode is the system default (as indi- cated in the SYSTEM box at lower right). ...
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Lennox International Inc. 51M32 - page 3
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. NOTE − The heating equipment is activated for at least 3 minutes if no but ...
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Lennox International Inc. 51M32 - page 4
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. Also, ...
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Lennox International Inc. 51M32 - page 5
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. Figure 13 Service Indicator Flashing ROOM 73 SERVICE FA N AUTO SY ...
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Lennox International Inc. 51M32 - page 6
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 . Filter Reminder Settings o f 0 ( O f f), 1, 3, 6 ...
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Lennox International Inc. 51M32 - page 7
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. The thermostat also includes a programmable filter change r ...
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Lennox International Inc. 51M32 - page 8
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. HEA T mode is the system default (as indi- cated in the SYSTEM box at lower right). ...
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Lennox International Inc. 51M32 - page 9
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. W hen in either heat mode, i f t he a ctual t emperature i s lower t han t he t emperature s etpoint, a h eating demand i s de- tected b y t h ...
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Lennox International Inc. 51M32 - page 10
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. See figure 3. The F AN button can be used to select either con ...
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Lennox International Inc. 51M32 - page 11
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. The bal- ance point feature allows the measured outdoor tempera- tur ...
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Lennox International Inc. 51M32 - page 12
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 = 0) Equipment Protection T imers reset back to zero T echnical Specifications Thermostat T ype Electronic nonprogrammable thermostat for 1H/1C, heat ...
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Lennox International Inc. 51M32 - page 13
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 terminal is shorted to the R terminal; OR if the thermostat Y1 terminal has been activated with 24V AC for at least 5 minutes, AND the L terminal is ...
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Lennox International Inc. 51M32 - page 14
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 demand dc Gas Heat Backup (Dual Fuel) − No Out door Sensor small heat demand X X large heat demand X emergency heat demand X cool demand X X X no d ...
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