tekmar 557 Thermostat User Manuals User Manual

Page 5

557_U - 08/12

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A Watts Water Technologies Company

Adjust the Time

Secondary Temperature Display

This thermostat can display the outdoor or floor temperature, relative humidity,
or the room heating and cooling temperature settings in the smaller number area
at the top right of the screen. To toggle the item currently displayed, touch the
secondary temperature. Display of the floor or outdoor temperature requires a
connection to an external floor or outdoor air sensor.

To change the current time, touch the clock on the display.

Use the or arrow to change the minutes, hour
and day.

Touch “NEXT ITEM” to advance to the next item or
“BACK” for the previous item.

To store the new time and date, press the home button,
or leave the screen untouched for several seconds.

Note: The time is not visible when the thermostat is in
the Away scene or if the clock display is turned off in the
Time menu.

•

Mode of Operation

This thermostat has 5 operating modes: Heat, Cool. Auto, Emer (emergency), and
Off. Touch the Mode key on the screen to select the desired mode of operation.

Auto mode will automatically switch between heating, cooling and the emergency
backup heat as required. Emergency mode is for heat pump installations whereby the
heat pump is forced off and the backup heat is manually turned on. The temperature
is not adjustable while the thermostat is off.

Note: If near freezing temperatures are detected the system will operate to maintain
40°F (4.5°C), even in the Off mode.