Lennox International Inc. 51M37 - Manual (Page 8)

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.
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
Timers Reset Back to Zero
Table 3
Default Program Settings
Programs Time
Temperature
(Heat) Temperature
(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
Technical Specifications
Thermostat Type
Electronic programmable thermostat for heat pump,
3-stage heat/2-stage cool.
NOTE − 2 stages of heat pump heat and one stage of auxil-
iary (gas or electric) backup heat are supported.
Power Supply Range
18VAC − 30VAC (24VAC nominal), 60Hz
CAUTION
24VAC is present on the terminals of the thermostat
bracket. If removing the thermostat from the wall,
use caution and avoid touching any of the connec-
tor terminals on the wall bracket.
Also, when working with the thermostat dip
switches, use a non−conductive tool and take cau-
tion to avoid making any contact with the circuit
board, its imprinted circuitry and its connector
prongs.
Temperature Display
Display Scale: Fahrenheit or Celsius user selectable (via
DIP switch; see figure 22)
Display range: 35°F (2°C) to 99°F (37°C)
Display resolution: 1°F (1°C)
Display Accuracy: +/−1°F
If the Fahrenheit/Celsius display must be changed, use a
plastic, non−conductive tool to push the dip switch to the
right position (see figure 22).
F/C (Fahrenheit/Celsius) switch
shown in Celsius position
Figure 22
Changing Fahrenheit/Celsius Setting
1
2
3
4
5
6
PLUG IN (Use Care To Avoid Bending Prongs.)
Temperature Measurement Range
Measurement Scale: Fahrenheit
Measurement Range: 35°F to 99°F
Measurement Resolution: 0.5°F
Measurement Accuracy: +/−1°F
Field Offset: via DIP switches to +/−3°F
Sampling Method: temperature measurements sampled
every 15 seconds. Displayed temperature is the average
of the last four measurements.
Temperature Setpoint Range
Setting range: 50°F (10°C) to 90°F (32°C)
Setting resolution: 1°F (1°C)