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) |
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Heat Setpoint (Perm Hold) | 70°F (or 21°C) |
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Cool Setpoint (Perm Hold) | 78°F (or 26°C) |
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Fan | Auto |
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Filter Reminder | OFF |
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Maintenance Reminder | OFF |
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Equipment Protection Timers | Reset Back to Zero |
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Autochangeover | OFF |
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Table 3
Default Program Settings − Time & Temp.
Programs | Time | Temp. − Heat | Temp. − Cool |
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All days − A | 6:00am | 70_F / 21°C | 78_F / 26°C |
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All days − B | 8:00am | 62_F / 17°C | 85_F / 29°C |
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All days − C | 6:00pm | 70_F / 21°C | 78_F / 26°C |
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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
With a LARGE heat demand, temperature is: less than setpoint
OR
With a VERY LARGE heat demand, temperature is: below setpoint
OR 15−minute 2nd upstage timer HAS expired.
Emergency heat demand (only if emergency heat is enabled): temperature is below setpoint
With a SMALL cool demand, temperature is: above setpoint +0.5F but below setpoint +1.5F AND
With a LARGE cool demand, temperature is: above setpoint +1.5F
OR
Table 4
THERMOSTAT OUTPUTS
Demand Condition | W1 | E | Y1 | Y2 | G | O |
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Cooling Demands
SMALL |
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| X |
| X | X |
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LARGE |
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| X | X | X | X |
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No Demand |
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| X |
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| Heating Demands |
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With Electric Backup (no outdoor sensor) |
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SMALL |
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| X |
| X |
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LARGE |
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| X | X | X |
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VERY LARGE |
| X |
| X | X | X |
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Emergency |
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| X |
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| X |
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No Demand |
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With Gas Backup (dual fuel; no outdoor sensor) |
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SMALL |
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| X |
| X |
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LARGE |
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| X | X | X |
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VERY LARGE |
| X |
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Emergency |
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| X |
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No Demand |
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With Electric Backup (outdoor sensor attached)
SMALL (Above Balance Point) |
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| X |
| X |
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LARGE (ABP) |
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| X | X | X |
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VERY LARGE (ABP) |
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| X | X | X |
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SMALL (Below Balance Point) |
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| X |
| X |
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LARGE (BBP) |
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| X | X | X |
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VERY LARGE (BBP) | X |
| X | X | X |
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Emergency |
| X |
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| X |
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No Demand |
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With Gas Backup (dual fuel; outdoor sensor attached)
SMALL (ABP) |
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| X |
| X |
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LARGE (ABP) |
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| X | X | X |
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VERY LARGE (ABP) | X |
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SMALL (BBP) | X |
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LARGE (BBP) | X |
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VERY LARGE (BBP) | X |
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Emergency |
| X |
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No Demand |
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Page 8
505069M 07/05
