tekmar 521 Programmable Thermostat Installation - Manual (Page 25)

© 2014 521_D - 01/14
25 of 28 A Watts Water Technologies Company
Optimum Start
When a programmable schedule is selected, there is a time delay for the room to warm
up from the temperature to the temperature. The thermostat has the option to use
Optimum Start to predict the heat up rate of the room. When Optimum Start is set to On,
the heating is started in advance to allow the room to reach the Set Room temperature
at the time set in the programmable schedule. The optimum start only applies to radiant
floor heating, baseboard or radiator heating and does not apply when a forced air fan
is used with the heating system.
Access Levels
Permanent Adjustment - No Schedule ------------------------------- -------------------------------
When no programmable schedule is used, push the or buttons to permanently
set the “Set Heat Room” or “Set Cool Room” temperature. This thermostat is capable
of controlling both air and floor temperature.
Permanent Adjustment - With Schedule ------------------------------ ------------------------------
When a programmable schedule is used, there are two temperature settings available,
one for the time period and another for the time period. When pushing the
or buttons to change the temperature, only the temperature for the current time
period is changed.
1. To adjust the temperature for both time periods, press and hold the
and buttons
for 3 seconds to enter the programming menus.
2. Enter the “SET TEMP” menu to adjust the following settings:
Set Heat Room (air heating)
Set Heat Room (air heating)
Set Floor (floor heating)
Set Floor (floor heating)
Set Cool Room (air cooling)
Set Cool Room (air cooling)
Permanent Hold ---------------------------------------------------- ----------------------------------------------------
The thermostat includes a Hold button. When the Hold button is pressed, the thermostat
stops operating based on the programmable schedule and the hold temperature can
be set using the
or buttons. Press the Hold button a second time to cancel the hold
and resume operating based upon the programmable schedule. If both an air and floor
sensor are installed, the floor maintains the Set Floor temperature setting when the
hold temperature is higher than the Set Heat Room . When the hold temperature is
set lower than the Set Heat Room , the floor does not maintain a temperature.
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Temperature Adjustment
The thermostat has two access levels: User and Installer. The Installer access level
provides access to all settings. The thermostat remains in the installer access level for
up to 24 hours after which it automatically changes to the user access level.
Once the thermostat has been installed, set the Lock / Unlock switch setting to Lock.
This hides the access level setting and prevents unauthorized changes to the thermostat
configuration settings.