21 of 28 © 2009 D 527 - 06/09
Exercising
When connected to a tekmarNet
®
System Control, the
thermostat exercises the heat relay for 10 seconds every 3
days. Exercising helps prevent zone valves or zone pumps
from failing due to precipitate buildup. During exercising,
the thermostat shows “TEST” on the display.
On a Thermostat 530, DIP switch 4 must be set to ‘hydronic’
in order for the thermostat to perform exercising.
Warm Weather Shut Down
The thermostat indicates warm weather shut down using
the WWSD icon. The WWSD feature prevents the heating
system from operating if the outdoor temperature is above
the WWSD temperature. The WWSD feature is activated by
the tekmarNet
®
System Control. In order to disable the WWSD,
the System Control’s WWSD setting must be adjusted.
Freeze Protection
In any event that the room temperature should fall below
40°F (4.5°C), the heating is turned on regardless of
thermostat mode.
Outdoor Temperature Display
When the thermostat is connected to a tekmarNet
®
system
that includes an outdoor sensor, the outdoor temperature is
displayed in the upper right hand corner of the display.
The 528 thermostat can also display the outdoor air
temperature if an outdoor air temperature sensor is
connected to the auxiliary sensor input and switch setting
is set to Outdoor (Off position). In this configuration, the
outdoor air temperature reading is communicated to all
other thermostats in the tekmarNet
®
system.
Flushing
If the thermostat is connected to a tekmarNet
®
System
Control with the Flushing feature turned on, the thermostat
display will display the “FLUSH” icon for the duration of the
flushing operation.
Indoor Temperature Feedback
The 527, 528 and 530 Thermostats can provide indoor
temperature feedback to a tekmarNet
®
System Control.
When using the 530 thermostat, DIP switch 4 must be set
to Hydronic (On position).
Indoor Temperature Feedback:
Optimizes system water temperature
Reduces temperature swings in the building
Increases efficiency by reducing boiler short cycling
Improves occupant comfort
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Indoor Temperature Feedback also allows the room
temperature to quickly recover after night setback ( to )
by temporarily increasing the water temperature to allow
more heat into the system.
The benefits of Indoor Feedback are only available when
using this thermostat with a tekmarNet
®
System Control.
Cycles Per Hour / Synchronization
When the thermostat is connected to a bus with a tekmarNet
®
System Control, the thermostat operates the heating system
on the cycles per hour determined by the control. The
thermostat automatically determines the cycles per hour
when operating the cooling system.
When the thermostat is not in communication with a
tekmarNet
®
System Control, the Heating Cycles Per Hour
setting in the Adjust menu allows the installer to select
Auto or Sync.
When set to Auto, the thermostat automatically determines
the cycles per hour.
When set to Sync, the thermostat synchronizes its cycle
with other thermostats on the tekmarNet
®
bus. This causes
thermostats to start heating at the same time, increasing the
load on the boiler and reducing boiler short cycling.
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