Lennox International Inc 51M37 I0, Removing and Installing Thermostat, Service Indicator

Models: 51M37

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Service Indicator

When abnormal equipment operation is detected, the SERVICE indicator will flash on the screen (see figure 17). This indicates that the equipment requires service from a qualified service technician.

Service Indicator Flashing

MO TU

WE

TH

FR SA

SU

FILTER

 

 

 

 

 

 

I0:i4

 

SERVICE

AM

 

FAN

PM

 

 

 

 

ON

 

 

 

 

 

PROG

 

 

 

 

AUTO

ROOM

 

 

 

SYSTEM

 

°

 

 

 

COOL

 

 

 

 

OFF

79

 

 

 

 

 

 

HEAT

 

 

 

 

 

Figure 17

Thermostat RESET

Under some abnormal conditions, it may be necessary to the thermostat to its default condition. Such a RE-

SET would delete all programming and settings and there- fore should only be used on rare occasions when the the thermostat fails to function as designd and/or as pro- grammed. Such an instance can occur as a result of a pow- er surge or similar electrical disturbance (e.g. after an elec- trical storm or power outage). The RESET button can be used to recover from this situation.

Removing and Installing Thermostat CAUTION

When the RESET button is pressed, ALL settings re- vert back to the defaults, including the default pro- gram (see tables 2 and 3).

The RESET button is an unlabeled, recessed button lo- cated behind the door on the right−hand side of the thermo- stat, below the SETTINGS button (see figure 3). Use a pa- per clip or small pencil to press the RESET button; ALL thermostat settings will be reset to the defaults listed in the Default Thermostat Settings section.

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 snaps), then lift up to remove.

To install it, first position the top tilted toward the wall brack- et and align it until you feel the tabs and slots engage; then, while the top is in place, pivot the bottom toward the wall until the thermostat snaps into place.

Default Thermostat Settings

Default thermostat settings are in table 2 and the default program is shown in table 3.

Table 2

Default Thermostat Settings

Mode

Heat (Permanent Hold

 

Mode)

 

 

Setpoint

70°F (or 21°C)

 

 

Fan

Auto

 

 

Filter Reminder

OFF

 

 

Maintenance Reminder

OFF

 

 

Equipment Protection

Reset Back to Zero

Timers

 

 

 

Table 3

Default Program Settings

 

 

Temperature

Temperature

Programs

Time

(Heat)

(Cool)

 

 

 

 

Weekday − A

6:00am

70_F / 21°C

78_F / 26°C

 

 

 

 

Weekday − B

8:00am

62_F / 17°C

85_F / 29°C

 

 

 

 

Weekday − C

6:00pm

70_F / 21°C

78_F / 26°C

 

 

 

 

Weekday − D

10:00pm

62_F / 17°C

82_F / 28°C

 

 

 

 

Weekend − A

6:00am

70_F / 21°C

78_F / 26°C

 

 

 

 

Weekend − B

8:00am

62_F / 17°C

85_F / 29°C

 

 

 

 

Weekend − C

6:00pm

70_F / 21°C

78_F / 26°C

 

 

 

 

Weekend − D

10:00pm

62_F / 17°C

82_F / 28°C

 

 

 

 

Weekday

Monday, Tuesday, Wednesday,

 

Thursday, Friday

 

 

 

 

Weekend

Saturday, Sunday

 

 

 

 

 

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Lennox International Inc 51M37 operation manual I0, Removing and Installing Thermostat, Service Indicator, Thermostat RESET