Gebruiksaanwijzing /service van het product 51M37 van de fabrikant Lennox International Inc.
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05/05 505,050M *2P0505* *P505050M* Page 1 E 2005 Lennox Industries Inc. Dallas, T exas, USA RET AIN THESE INSTRUCTIONS FOR FUTURE REFERENCE 51M37 Merit ® Series Thermost at The Lennox Merit ® Series 5/2 day programmable electronic thermostat 51M37 provides excellent temperature control and a large, easy-to-read display .
Page 2 505050M 5/1/05 Within a few seconds, the Home Screen appears (see fig- ure 2) with default settings as shown. After about 1 minute of initialization time, the actual room temperature will be displayed. NOTE − T ables 2 and 3 on page 8 show all system and programming default s.
Page 3 51M37 SERIES 5/2 HEA T − Using the Heat Mode Normal Heat Mode In normal heat mode, both the heat pump and the backup heat source are used to provide heat. If the thermost at d e- tects that the heat pump is not able to provide enough heat (as may be the case in very cold weather), then the backup heat source is activated.
Page 4 505050M 5/1/05 COOL − Using the Cool Mode Enabling and Disabling Cool Mode Use the COOL button to enable or disable cool mode as desired. If the thermostat is in HEA T or OFF mode, cool mo d e is enabled when the COOL button is pressed. This is indicated by COOL in the SYSTEM box (s ee f i gu r e 9).
Page 5 51M37 SERIES 5/2 HOLD − Using T emperature Hold Modes When HOLD is displayed at the HOME screen, the ther- mos tat is in a temperature hold condition. This means that the temperature program data is ignored and the thermo- stat functions much like a non−programmable thermost at.
Page 6 505050M 5/1/05 5. Repeat step s 2 through 4 for periods B, C, and D. 6. Repeat step s 1 through 5 for the 2−day program. NOTE − This thermost at will NOT automatically switch from heating to cooling, or vice versa; operator involve- men t is required.
Page 7 51M37 SERIES 5/2 SETTINGS − 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, balance point adjustment is available.
Page 8 505050M 5/1/05 Default Thermostat Settings Default thermostat settings are shown in table 2 and the default program is shown in table 3. T able 2 Default Thermostat Settings Mode Heat (Permanen.
Page 9 51M37 SERIES 5/2 Smart Setback Recovery (via DIP switch #6) Smart Setback Recovery (SSR) affects the way the ther- mo st at responds to program events. If SSR is disabled, th e thermostat will react to a program event at the time the event occurs.
Page 10 505050M 5/1/05 Thermostat Output T able T able 5 depicts the 51M37 thermostat output st ates for var- ious input conditions. The following notes described terms used in the t able.
05/05 505,049M *2P0505* *P505049M* Page 1 E 2005 Lennox Industries Inc. Dallas, T exas, USA RET AIN THESE INSTRUCTIONS FOR FUTURE REFERENCE 51M35 Merit ® Series Thermost at The Lennox Merit ® Series 5/2 day programmable electronic thermostat 51M35 provides excellent temperature control and a large, easy-to-read display .
Page 2 505049M 5/1/05 Within a few seconds, the Home Screen appears (see fig- ure 2) with default settings as shown. After about 1 minute of initialization time, the actual room temperature will be displayed. NOTE − T ables 2 and 3 on page 6 show all system and programming default s.
Page 3 51M35 SERIES 5/2 HEA T − Using the Heat Mode Enabling and Disabling Heat Mode The thermostat must be in the HEA T mode to control the heating equipment.
Page 4 505049M 5/1/05 HOLD − Using T emperature Hold Modes When HOLD is displayed at the HOME screen, the ther- mos tat is in a temperature hold condition. This means that the temperature program data is ignored and the thermo- stat functions much like a non−programmable thermost at.
Page 5 51M35 SERIES 5/2 NOTE − This thermost at will NOT automatically switch from heating to cooling, or vice versa; operator involve- men t is required. At the change of seasons, or to accomo- date abnormal seasonal temperature swings, you must manually select to the opposite conditioning (Heat or Cool) program.
Page 6 505049M 5/1/05 Service Indicator When abnormal equipment operation is detected, the SERVICE in d icator will flash on the screen (see figure 17).
Page 7 51M35 SERIES 5/2 T echnical S pecifications Thermostat T ype Electronic programmable thermostat for 2−S tage (gas or electric) Heat/2-S tage Cool, non−heat pump, non−power robbing applications. Power Supply Range 18V AC − 30V AC (24V AC nominal), 60Hz CAUTION 24V AC is present on the terminals of the thermost at bracket.
Page 8 505049M 5/1/05 Maintenance Reminder Settings of Of f, 6 or 12 (months of chronological time) are available. W hen programmed time has elap sed, a mainte- nance indicator MAINT" is displayed.
05/05 505,048M *2P0505* *P505048M* Page 1 E 2005 Lennox Industries Inc. Dallas, T exas, USA RET AIN THESE INSTRUCTIONS FOR FUTURE REFERENCE 51M34 Merit ® Series Thermost at The Lennox Merit ® Series 5/2 day programmable electronic thermostat 51M34 provides excellent temperature control and a large, easy-to-read display .
Page 2 505048M 5/1/05 Within a few seconds, the Home Screen appears (see fig- ure 2) with default settings as shown. After about 1 minute of initialization time, the actual room temperature will be displayed.
Page 3 51M34 SERIES 5/2 HEA T − Using the Heat Mode Enabling and Disabling Heat Mode The thermostat must be in the HEA T mode to control the heating equipment.
Page 4 505048M 5/1/05 HOLD − Using T emperature Hold Modes When HOLD is displayed at the HOME screen, the ther- mos tat is in a temperature hold condition. This means that the temperature program data is ignored and the thermo- stat functions much like a non−programmable thermost at.
Page 5 51M34 SERIES 5/2 NOTE − This thermost at will NOT automatically switch from heating to cooling, or vice versa; operator involve- men t is required. At the change of seasons, or to accomo- date abnormal seasonal temperature swings, you must manually select to the opposite conditioning (Heat or Cool) program.
Page 6 505048M 5/1/05 Service Indicator When abnormal equipment operation is detected, the SERVICE in d icator will flash on the screen (see figure 17).
Page 7 51M34 SERIES 5/2 T echnical S pecifications Thermostat T ype Electronic programmable thermostat for 1-S tage- Heat/1-S tage Cool, gas or electric heat, non−heat pump, non−power robbing applications. Power Supply Range 18V AC − 30V AC (24V AC nominal), 60Hz CAUTION 24V AC is present on the terminals of the thermost at bracket.
Page 8 505048M 5/1/05 Maintenance Reminder Settings of Of f, 6 or 12 (months of chronological time) are available. W hen programmed time has elap sed, a mainte- nance indicator MAINT" is displayed.
07/05 505,068M *2P0705* *P505068M* Page 1 E 2005 Lennox Industries Inc. Dallas, T exas, USA RET AIN THESE INSTRUCTIONS FOR FUTURE REFERENCE 51M39 Merit ® Series Thermost at The Lennox Merit ® Series 7 day programmable electronic thermostat 51M39 provides excellent temperature control and a large, easy-to-read display .
Page 2 505068M 07/05 Within a few seconds, the HOME screen appears (see fig- ure 2) with default settings as shown. After about 1 minute of initialization time, the actual room temperature will be displayed. NOTE − T ables 2 and 3 on page 7 show all system and programming default s.
Page 3 51M39 SERIES 5/2 HEA T − Using the Heat Mode Enabling and Disabling Heat Mode The thermostat must be in the heat mode to control the heating equipment.
Page 4 505068M 07/05 NOTE − If no buttons are pressed during a demand for cooling, t he equipment must operate for at least 4 minutes. Afte r a demand has been satisfied, cooling equipment op- eration is locked out for 5 minutes.
Page 5 51M39 SERIES 5/2 Figure 1 1 Program Example 6AM NOON 6PM MID 6AM NIGHT A B D A B D A B D A B D A B C D A B C D A B C D C C C C SA TURDA Y PROGRAM: 72° 68° 64° SUNDA Y PROGRAM: 72° 68° 64°.
Page 6 505068M 07/05 Displaying Outside T emperature Pressing the ENTER (Outside) button at the HOME screen di sp l ays the out side temperature (see figure 15) for several seconds, then returns to room temperature.
Page 7 51M39 SERIES 5/2 Removing and Installing Thermostat The thermostat hinges on tabs on the top of the subbase; no tool is needed to remove the thermostat from the sub- base. Pivot the bottom of the thermostat outward (releas- ing the snap s), then lif t up to remove.
Page 8 505068M 07/05 T echnical S pecifications Thermostat T ype Electronic programmable thermostat for 2−S tage (gas or electric) Heat/2-S tage Cool, non−heat pump, non−power robbing applications.
Page 9 51M39 SERIES 5/2 NOTE − All protection timers (except the compressor OFF timer) can be over−ridden if a heating or cooling demand is initiated or terminated using the UP , DOWN, HEA T , or COOL buttons.
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07/05 505,069M *2P0705* *P505069M* Page 1 E 2005 Lennox Industries Inc. Dallas, T exas, USA RET AIN THESE INSTRUCTIONS FOR FUTURE REFERENCE 51M42 Merit ® Series Thermost at The Lennox Merit ® Series 7−day programmable electronic thermostat 51M42 provides excellent temperature control and a large, easy-to-read display .
Page 2 505069M 07/05 Within a few seconds, the HOME screen appears (see fig- ure 2) with default settings as shown. After about 1 minute of initialization time, the actual room temperature will be displayed. NOTE − T ables 2 and 3 on page 8 show all system and programming default s.
Page 3 51M42 SERIES 5/2 HEA T − Using the Heat Mode Normal Heat Mode In normal heat mode, both the heat pump and the backup heat source are used to provide heat. If the thermost at d e- tects that the heat pump is not able to provide enough heat (as may be the case in very cold weather), then the backup heat source is activated.
Page 4 505069M 07/05 COOL − Using the Cool Mode Enabling and Disabling Cool Mode Use the COOL button to enable or disable cool mode as desired. If the thermosta t i s in heat or of f mode, cool mode is enabled when the COOL button is pressed. This is indi- cated by COOL on the r igh t si de of the disp lay (s e e fig u r e 9).
Page 5 51M42 SERIES 5/2 T emporary (2-Hour) Hold At any time the program is running, from the HOME screen, set a temporary 2-hour hold by pressing the Up/ Down arrow buttons until the desired setpoint is displayed; HOLD" flashes (see figure 12).
Page 6 505069M 07/05 F AN − Controlling the Fan Operation U s e the F AN button to select either continuous fan mode or auto fan mode. T o change from continuous to auto fan mode (or vice ver - sa), press the F AN button. Note whether a fan icon in the F AN b ox is present (indicating that the fan is running) or not (fan not running) .
Page 7 51M42 SERIES 5/2 COOL OFF AUTO EMG. HEAT I0:26 PROG A B C D HOLD F AN ON AUT O FIL TER S ER VICE MAINTENANCE 76 Reminders Figure 19 ROOM ° MO AM PM COOL OFF AUTO EMG.
Page 8 505069M 07/05 Default Thermostat Settings Default thermostat settings are shown in table 2 and the default program is shown in table 3. T able 2 Default Thermostat Settings Mode Heat (Perm.
Page 9 51M42 SERIES 5/2 T echnical S pecifications Thermostat T ype Electronic programmable thermostat for heat pump, 3-stage heat/2-st age cool. NOTE − 2 s t ages of heat pump heat and one st age of auxil- iary (gas or electric) backup heat are supported.
Page 10 505069M 07/05 T able 5 51M42 T erminal Designations T erm. Description B Reversing valve, heat active O Reversing valve, cool active R 24V AC Y1 First-stage cooling/heating, compressor energiz.
07/05 505,067M *2P0705* *P505067M* Page 1 E 2005 Lennox Industries Inc. Dallas, T exas, USA RET AIN THESE INSTRUCTIONS FOR FUTURE REFERENCE 51M38 Merit ® Series Thermost at The Lennox Merit ® Series 7 day programmable electronic thermostat 51M38 provides excellent temperature control and a large, easy-to-read display .
Page 2 505067M 7/13/05 Within a few seconds, the HOME screen appears (see fig- ure 2) with default settings as shown. After about 1 minute of initialization time, the actual room temperature will be displayed.
Page 3 51M38 SERIES 5/2 HEA T − Using the Heat Mode Enabling and Disabling Heat Mode The thermostat must be in the heat mode to control the heating equipment.
Page 4 505067M 7/13/05 HOLD − Using T emperature Hold Modes When HOLD is displayed at the HOME screen, the ther- mos tat is in a temperature hold condition. This means that the temperature program data is ignored and the thermo- stat functions much like a non−programmable thermost at.
Page 5 51M38 SERIES 5/2 1. Press and re lease the PROG button. "MO" (Monday), "AM 6:00", period "A", "COOL SETPOINT 78", and "HEA T SETPOINT 70" are displayed.
Page 6 505067M 7/13/05 The default setting for the reminders is OFF (disabled). Press Up/Down arrow buttons to select the desired re- minder intervals.
Page 7 51M38 SERIES 5/2 T able 3 Default Program Settings (Time & T emp.) Programs Time T emp. − Heat T emp. Cool All days − A 6:00am 70 _ F / 21 ° C 78 _ F / 26 ° C All days − B 8:00am 62.
Page 8 505067M 7/13/05 Smart Setback Recovery (via DIP switch #6) Smart Setback Recovery (SSR) affects the way the ther- mo st at responds to program events. If SSR is disabled, th e thermostat will react to a program event at the time the event occurs.
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