Lennox International Inc 51M37 operation manual Default Program Settings − Time & Temp

Page 44

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 (Perm. Hold)

 

 

Heat Setpoint (Perm Hold)

70°F (or 21°C)

 

 

Cool Setpoint (Perm Hold)

78°F (or 26°C)

 

 

Fan

Auto

 

 

Filter Reminder

OFF

 

 

Maintenance Reminder

OFF

 

 

Equipment Protection Timers

Reset Back to Zero

 

 

Autochangeover

OFF

 

 

Table 3

Default Program Settings − Time & Temp.

Programs

Time

Temp. − Heat

Temp. − Cool

 

 

 

 

All days − A

6:00am

70_F / 21°C

78_F / 26°C

 

 

 

 

All days − B

8:00am

62_F / 17°C

85_F / 29°C

 

 

 

 

All days − C

6:00pm

70_F / 21°C

78_F / 26°C

 

 

 

 

All days − D

10:00pm

62_F / 17°C

82_F / 28°C

Thermostat Output Table

Table 4 depicts the 51M42 thermostat output states for var- ious input conditions. The following notes described terms used in the table.

NOTES:

SX = output is activated with 24VAC.

SBBP: outdoor temperature is below balance point

SABP: outdoor temperature is above balance point

SIn all cases, the state of the B terminal is opposite that of the O terminal

SData are tabulated for AUTO fan setting. If the fan set- ting is ON, the G output is activated in all cases

SUpstage timers:

30 minutes (when upstaging from small to large demand)

15 minutes (HEAT MODE ONLY − when upstaging from large to very large demand)

SThe temperature ranges expressed in the following definitions of Y LARGE" de-

mands are for guidance only; actual temperatures may vary:

With a SMALL heat demand, temperature is: below setpoint –0.5F but above setpoint –1.5F AND 30-minute upstage timer HAS NOT expired.

With a LARGE heat demand, temperature is: less than setpoint –1.5F

OR 30-minute upstage timer HAS expired.

With a VERY LARGE heat demand, temperature is: below setpoint –2.5F

OR 15−minute 2nd upstage timer HAS expired.

Emergency heat demand (only if emergency heat is enabled): temperature is below setpoint –0.5F.

With a SMALL cool demand, temperature is: above setpoint +0.5F but below setpoint +1.5F AND 30-minute upstage timer HAS NOT expired.

With a LARGE cool demand, temperature is: above setpoint +1.5F

OR 30-minute upstage timer HAS expired.

Table 4

THERMOSTAT OUTPUTS

Demand Condition

W1

E

Y1

Y2

G

O

 

 

 

 

 

 

 

Cooling Demands

SMALL

 

 

 

X

 

X

X

 

 

 

 

 

 

 

 

LARGE

 

 

 

X

X

X

X

 

 

 

 

 

 

 

 

No Demand

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heating Demands

 

 

 

 

 

 

 

 

 

 

 

 

With Electric Backup (no outdoor sensor)

 

 

 

 

 

 

 

 

 

 

 

SMALL

 

 

 

X

 

X

 

 

 

 

 

 

 

 

 

LARGE

 

 

 

X

X

X

 

 

 

 

 

 

 

 

 

VERY LARGE

 

X

 

X

X

X

 

 

 

 

 

 

 

 

 

Emergency

 

 

X

 

 

X

 

 

 

 

 

 

 

 

 

No Demand

 

 

 

 

 

 

 

 

 

 

 

 

 

 

With Gas Backup (dual fuel; no outdoor sensor)

 

 

 

 

 

 

 

 

 

 

SMALL

 

 

 

X

 

X

 

 

 

 

 

 

 

 

 

LARGE

 

 

 

X

X

X

 

 

 

 

 

 

 

 

 

VERY LARGE

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

Emergency

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

No Demand

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

With Electric Backup (outdoor sensor attached)

SMALL (Above Balance Point)

 

 

X

 

X

 

 

 

 

 

 

 

 

LARGE (ABP)

 

 

X

X

X

 

 

 

 

 

 

 

 

VERY LARGE (ABP)

 

 

X

X

X

 

 

 

 

 

 

 

 

SMALL (Below Balance Point)

 

 

X

 

X

 

 

 

 

 

 

 

 

LARGE (BBP)

 

 

X

X

X

 

 

 

 

 

 

 

 

VERY LARGE (BBP)

X

 

X

X

X

 

 

 

 

 

 

 

 

Emergency

 

X

 

 

X

 

 

 

 

 

 

 

 

No Demand

 

 

 

 

 

 

 

 

 

 

 

 

 

With Gas Backup (dual fuel; outdoor sensor attached)

SMALL (ABP)

 

 

X

 

X

 

 

 

 

 

 

 

 

LARGE (ABP)

 

 

X

X

X

 

 

 

 

 

 

 

 

VERY LARGE (ABP)

X

 

 

 

 

 

 

 

 

 

 

 

 

SMALL (BBP)

X

 

 

 

 

 

 

 

 

 

 

 

 

LARGE (BBP)

X

 

 

 

 

 

 

 

 

 

 

 

 

VERY LARGE (BBP)

X

 

 

 

 

 

 

 

 

 

 

 

 

Emergency

 

X

 

 

 

 

 

 

 

 

 

 

 

No Demand

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 8

505069M 07/05

Page 43 Page 45
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Page 43 Page 45
Contents 51M37 Merit Series Buttons, Backlight, Timers & Settings DAY/TIME − Setting the Day and TimeThermostat Buttons Home ScreenHeat − Using the Heat Mode FANCool − Using the Cool Mode Enabling and Disabling Cool ModeCool Mode Disabled Turn Cool ON/OFFI036 FAN PM I036 FANSettings − Filter/Maintenance Reminders FAN − Controlling the Fan OperationSettings − Balance Point Service IndicatorThermostat Reset Removing/Installing ThermostatDefault Thermostat Settings Technical SpecificationsSmart Setback Recovery via DIP switch #6 Equipment Protection TimersOver−Temperature Protection Maintenance ReminderHeating Demands Thermostat Output TableCooling Demands 51M35 Merit Series 51M35 Merit Series Thermostat505049M 5/1/05 Heat − Using the Heat Mode Cool − Using the Cool Mode Enabling and Disabling Heat ModeHeat/Cool Mode Disabled Turn Heat ON/OFFHold − Using Temperature Hold Modes 1st press Removing and Installing Thermostat I0i451M35 Terminal Designations Thermostat Outputs Gas Heat, Auto FanGas Heat, Continuous Fan Electric Heat, Auto Fan51M34 Merit Series 51M34 Merit Series Thermostat505048M 5/1/05 51M34 Series 5/2 I036 FAN OFF I0i4 51M34 Terminal Designations Heat Demand Cool Demand No Demand 51M39 Merit Series 51M39 Merit Series ThermostatI026 I030 Heat/Cool Mode Disabled Cooling Demand530 Auto − Using the Autochangeover Mode Copy a Programmed Day to An other Day Displaying Outside Temperature Check Outside TemperatureFilter Maintenance Indicators Service Indicator FlashingDefault Program Settings Time & Temp Indoor Temperature Measurement Range Outdoor Temperature Measurement RangeAutochangeover Deadband Selection via DIP switch #7 51M39 Terminal DesignationsThermal-mechanical switch opens W1 and W2 at 93F+/−6F Page −Day Programmable Thermostat 51M42 Merit Series51M42 Merit Series Thermostat 505069M 07/05 Large Heat Heating Demand FAN Auto MID Reminder Settings Display Using Fan on I026 Default Program Settings − Time & Temp With Electric Backup no outdoor sensorTechnical Specifications 51M42 Terminal Designations 51M38 Merit Series 51M38 Merit Series ThermostatY/TIME button 51M38 Series 5/2 Hold − Using Temperature Hold Modes Repeat steps a and B for as many days as you Settings Thermostat Output Table 51M38 Terminal Designations

51M37 specifications

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