Tekmar D540, Руководство по установке и эксплуатации

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Cooling Operation
Section B
The thermostat operates the cooling system to maintain the Set Room Cool
temperature. The C1 symbol is shown on the display when the thermostat is
cooling. The cooling can cycle on and off /- 1.5°F (1°C) of the Set Room
Cool temperature.
The cooling system has a fixed minimum on time of 2 minutes and a minimum off
time of 5 minutes in order to prevent cooling equipment short cycling.
Cooling Groups
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In order to prevent heating and cooling at the same time, this thermostat can operate
together with other thermostats on a tekmarNet
® system to form a cool group. When
this thermostat is set as the Cool Group 1 master, it operates the cooling equipment
for the group. Other thermostats can be set to become members of cool group
1. When the cooling is turned on, all cool group member thermostats ensure the
heating is off. This thermostat is the master of Cool Group 1 when switch setting
3 is set to “Cool Master 1” (down position). When operating as a cool group, the
air temperature readings of all the cool group member thermostats are displayed
on the master as an average.
The cool group average temperature is shown as the “Room” temperature while
the mode is set to Cool, or the mode is set to Auto and the thermostat is allowing
cooling operation. In all other modes, the
cool group master thermostat measures
and displays the built-in “local” temperature
sensor measurement.
Fluctuations in the displayed “Room”
temperature may occur during automatic
mode switch over when the display changes
from using the local temperature for heating
to using the cool group average temperature
for cooling.
Cool Group 1
Master Member Member
tN2 Communication
If the thermostat operates a thermal motor (wax actuator) zone valve, set the Supply
Pump setting to Delay. This provides a three minute delay to allow the zone valve to
open before the primary or mix pump is turned on and the boiler is allowed to fire.
In special applications with multiple zoning manifolds, the Supply Pump setting
can be set to Off. This allows a Zone Group Pump located on the Zone Manager,
or Wiring Center to operate the pump for the manifold.
DHW Tank Priority
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When a tekmarNet
®
reset control is heating an indirect Domestic Hot Water (DHW)
tank, the thermostat may shut off the heating zones to allow the DHW tank to recover
quickly. This is determined by the DHW priority of the tekmarNet
® reset control.
Warm Weather Shut Down
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When the outdoor air temperature exceeds the Warm Weather Shut Down (WWSD)
setting on the tekmarNet
®
reset control, the heating system is shut off.