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Water Temperature Setback

timedHtgStbkWhen setback is required, the water temperature to the system should be decreased to provide less heat into the space. tekmar Reset Controls shift the heating curve down in order to provide lower water temperatures when an UnOccupied signal is given to the control. The amount that the heating curve can be shifted is adjustable.

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Adjustment Range Limit

Adjustment Range Limit

In systems where tenants have control of the space temperature, a central zone control with a temperature Adjustment Range Limit can...

Air Groups

Air Groups

In most hydronic systems there are several heating zones within one cooling zone. Until now, unfortunately, the cooling system was not...

Automatic Boiler Differential

Automatic Boiler Differential

In order to decrease temperature swings and increase boiler efficiency, this function automatically changes the on / off differential of the...

Boiler Enable

Boiler Enable

When multiple controls in a single system try to operate the boiler(s) simultaneously, short cycling can occur. For the most efficient...

Boiler Load Reset

Boiler Load Reset

Many systems, such as radiant heating, use a mixing device to reduce the system supply water temperature. The boiler in these...

Boiler Mass

Boiler Mass

The heat up and cool down rate of a boiler depends on how much thermal mass the boiler contains. By knowing...

Boiler Minimum Supply

Boiler Minimum Supply

Most boilers require a minimum supply water temperature in order to prevent corrosion from flue gas condensation. The control should therefore...

Boiler Outdoor Reset

Boiler Outdoor Reset

A boiler is controlled by turning it on and off. In applications where Outdoor Reset is used, the boiler temperature can...

Boiler Post Purge

Boiler Post Purge

When a boiler is turned off some heat remains in the mass of the boiler. If the flow through the boiler...

Boiler Protection

Boiler Protection

To protect the boiler against flue gas condensation and thermal shock, a mixing device should be used to control the load...

Boost

Boost

When combining setback with outdoor reset, the morning recovery period can be extremely long. By increasing the supply water temperature after...

Characterized Heating Curve

Characterized Heating Curve

A Characterized Heating Curve is a more accurate method of outdoor reset. Each type of terminal unit delivers heat into a...

Cold Weather Cut Off

Cold Weather Cut Off

At extreme cold outdoor temperature, considerable energy can be saved by turning the snow melting system off. With these extreme outdoor...

DHW Boiler Reset Override

DHW Boiler Reset Override

Most indirect fired DHW tanks require a boiler supply water temperature of at least 180°F (82°C) in order to transfer sufficient...

DHW Mixing Purge

DHW Mixing Purge

When DHW priority is used, the water temperature within the heating terminals may have cooled down significantly lower than the boiler...

DHW Optimum Start

DHW Optimum Start

To ensure that the DHW tank is up to temperature after the DHW Setback period the control must raise the tank...

DHW Post Purge

DHW Post Purge

During DHW operation, the boiler temperature is normally raised above 180°F (82°C). Once the DHW tank is satisfied, the residual heat...

DHW Priority

DHW Priority

DHW priority allows the DHW tank to recover faster by temporarily suspending the heat supply to the heating system. All of...

DHW Priority Override

DHW Priority Override

If DHW priority is selected then heat to the heating system is stopped during a call for DHW. At cold outdoor...

DHW Setback

DHW Setback

During the night, or when people are not within the building, energy can be saved by lowering the DHW tank temperature....

Equal Run Time Rotation

Equal Run Time Rotation

This function rotates the firing sequence of a group of staged boilers based on the accumulated running hours of each stage....

Exercising

Exercising

The control operates the system components every three days for a few seconds to help prevent corrosion build up and the...

Fire Delay

Fire Delay

Most boilers have built in safety delays before the burner is allowed to fire. The Fire Delay function allows a boiler...

Fixed Last

Fixed Last

When multiple boilers are staged and rotated, the last stage can be fixed to fire last. A common application is to...

Fixed Lead

Fixed Lead

When multiple boilers are staged and rotated the first boiler can be fixed to be fired first at all times. This...

Floating Action Output

Floating Action Output

Floating action is an output used to modulate the position of an actuating motor and mixing valve. Floating Action either provides...

Floor Sensing

Floor Sensing

In radiant systems it is common to hear the complaint that the floors are cold. However, one must consider that the...

Heating and Cooling Interlock

Heating and Cooling Interlock

Heating / Cooling Interlock prevents the system from heating and cooling simultaneously. When the heating Room Temperature Units (RTU) have been...

Indoor Temperature Feedback

Indoor Temperature Feedback

Most buildings have internal heat gains and losses due to people, passive solar heating, or opening of doors. If only the...

Lo Hi Fire Boiler Rotation

Lo Hi Fire Boiler Rotation

Many boilers or water heaters have two stage burners. The control must therefore stage the operation of the burner by first...

Lockout Differential

Lockout Differential

In order to increase the efficiency of a steam system, a Lockout or cool down period before each heating cycle can...

Mixing Outdoor Reset

Mixing Outdoor Reset

The full range of temperatures required through a heating season can be provided with a non-condensing boiler together with a mixing...

Modulating Output

Modulating Output

A modulating output provides a signal which is directly proportional to the actuator position required by the control. Common modulating output...

On / Off Differential

On / Off Differential

An on / off device, such as a boiler, must be operated with a differential in order to prevent short cycling....

On Off Injection Output

On Off Injection Output

On / Off Injection output is used to operate an on / off device, such as a valve or a pump...

Optimum Start / Stop

Optimum Start / Stop

When a setback schedule is in effect, the building experiences delays in dropping down its temperature at the beginning of the...

Outdoor Temperature Reset

Outdoor Temperature Reset

In order to properly control a hot water heating system, the heat supplied to a building must equal the heat loss...

PID Staging

PID Staging

To provide proper boiler staging and accurate boiler supply temperatures, PID (Proportional, Integral, Derivative) control logic should be used. With PID...

PID Zone Temperature Control

PID Zone Temperature Control

To prevent excessive room temperature swings and offset, PID (Proportional, Integral, Derivative) control logic should be used to control the zone...

Programmable Schedules

Programmable Schedules

Thermostat scheduling allows the room temperature to be automatically setback during the heating season, or set up during the cooling season....

Pulse Width Modulation

Pulse Width Modulation

Pulse Width Modulation (PWM) is an on / off action that differs from an on / off differential by changing the...

Radiant Base Load

Radiant Base Load

Radiant Base Load uses Two-Stage operation to speed up the response of a radiant system. The thermostat operates the first stage...

Remote Sensing

Remote Sensing

Remote sensing allows the end user to control the indoor temperature of several zones from one central location. Multiple indoor sensors...

Scenes

Scenes

A scene is a state that all zones react to. Each zone may be selected to react in a particular way...

Setpoint Boiler Reset Override

Setpoint Boiler Reset Override

Most setpoint loads in a heating system operate year round and often at temperatures above the reset operating temperature. When the...

Setpoint Priority

Setpoint Priority

Setpoint Priority allows the setpoint load to recover faster by temporarily suspending the heat supply to the heating system. All of...

Slab Outdoor Reset

Slab Outdoor Reset

In snow melting systems the slab sensor is normally an inch below the slab surface. When the outdoor temperature suddenly drops,...

Slab Protection

Slab Protection

Snow melting system deal with extreme temperature differences. Slab protection is provided by limiting the rate of heat transfer into the...

Snow and Ice Detection

Snow and Ice Detection

Snow / ice detection is used to automatically start and stop a snow melting system. When there is snow on the...

Snow Idling Setpoint

Snow Idling Setpoint

In systems where snow and ice removal is critical, such as hospital ramps, the pick up time for a snow melting...

Snow Melting Setpoint

Snow Melting Setpoint

In snow melting systems accurate control of the slab surface temperature is required in order to provide an energy efficient system....

Soft Start

Soft Start

When a sudden change of supply water temperature occurs, the heating system is subjected to thermal stresses. This is evident in...

Steam Established

Steam Established

In steam systems the boiler is operated in heating cycles which are dependent on the outdoor temperature. Each heating cycle starts...

System Protection

System Protection

Some systems such as radiant floor heating must be maintained below an allowable maximum temperature in order to protect the tubing...

System Schedule

System Schedule

tekmarNet®4 provides the flexibility to install a programmable thermostat to provide a system schedule that other simpler thermostats can share. Up...

Two Stage Heating

Two Stage Heating

To provide proper two staging heating and an accurate room temperature, PID (Proportional, Integral, Derivative) control logic should be used. With...

Variable Speed Output

Variable Speed Output

Variable Speed Output is used to vary the speed of a permanent capacitor, impedance protected pump motor of less than 1/6...

Viscosity Compensation

Viscosity Compensation

A glycol solution in snow melting systems increases viscosity at colder temperatures. This reduces the system flow rate and heat transfer....

Warm Weather Cut Off

Warm Weather Cut Off

When the slab and outdoor temperatures are warm enough, the snow melting system should automatically turn off. The Warm Weather Cut...

Warm Weather Shut Down

Warm Weather Shut Down

When the outdoor air temperature is warmer than the indoor temperature, no additional heat is required in the building and therefore...

Water Temperature Boost

Water Temperature Boost

By increasing the supply water temperature during the recovery period before the end of the setback schedule, faster pick up times...

Water Temperature Setback

Water Temperature Setback

When setback is required, the water temperature to the system should be decreased to provide less heat into the space. tekmar...

Zone Post Purge

Zone Post Purge

Since a Zone Control calculates all the on times of the zones, a Zone Post Purge can be performed. Before the...

Zone Synchronization

Zone Synchronization

In typical zoned systems, the thermostats operate on a stand-alone basis. This means that a zone turns on and off as...

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