Cooling operation – tekmar 521 Programmable Thermostat Installation User Manual

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A Watts Water Technologies Company

90°F (32°C)
Feels hot to the touch

80 to 85°F (26 to 30°C)
Feels warm to the touch

70°F (21°C)
Feels cool to the touch

40 to 45°F (5 to 7°C)
Feels cold to the touch

Suggested maximum for all floor
types other than wood.

Bathrooms and kitchens. Suggested
maximum for wood floors.

Rooms with large windows preventing
under heating in the evening.

Freeze protection for garages.

Two-Stage Heating

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Cooling Operation

Cooling is available when the Mode is set to Cool. The thermostat must be configured
for heat/cool/fan operation in order for the cooling operation to available.

To change the cool temperature setting, push the

button to select a preferred

temperature setting for the current schedule time period. The Cool On symbol is shown
on the display when the thermostat is cooling.

To change the temperatures for the other time periods, enter the Set Temp menu by
pressing both the

and

buttons together, press Menu to locate the Set Temp menu,

and press PRGM to enter the menu.

When operating a forced air cooling system, the thermostat uses a differential of +/-
0.7°F (0.4°C).

This operation is also recommended for rooms with hardwood floors. Setting floor
minimum and maximum temperatures is a way of enhancing the comfort of the living
space while protecting floor coverings.

The thermostat supports two-stage
heating. The second stage heat turns
on when the air temperature falls
below the Set Heat minus the W2
Differential setting and the W2 Delay
time expires. The second stage heat
turns off when the room temperature
reaches the Set Heat setting.

Set Heat Room

Differential

W2 On

W2 Off

W1 On

W1 Off

Freeze Protection

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The thermostat operates the heat whenever the room temperature falls below 40°F
(4.5°C) even when the mode is set to off.