Application Brochure

ManualsBrandsTekmar ManualsBoiler/DHW ControlsSteam Control - One Stage

A 279

12/07

- Application Brochure

Steam Control 279

Electrical

Application A 279-1

System Description: The Steam Control 279 regulates the indoor temperature based on firing time of the steam boiler.

The firing time of the steam boiler is based on outdoor temperature, condensate return temperature and control settings.

The condensate return sensor provides information to the control to determine when the boiler has produced enough

steam to reach the furthest radiator and to start the percent boiler on time.

Mechanical

Concept Drawing: This is only a concept drawing, not an engineered drawing. It is not intended to describe a complete system, nor any particular system. It is up to the

system designer to determine the necessary components for and configuration of the particular system being designed, including additional equipment, isolation relays

(for loads greater than the control’s specified output ratings), and any safety devices which in the judgement of the designer are appropriate, in order to properly size,

configure and design that system and to ensure compliance with building and safety code requirements.

115 V (ac)

T3 T2

Zone 1Zone 2Zone 3

279

115 V (ac)

S1Boiler

Sen

Do not apply power

279

Power

634 7

Boiler Com Com

DHW

Indr Indr Com Cdn Out

Alert 2Alert 1

High Low

S1 = Outdoor Sensor 070

S2 = Condensate Sensor 071

T1...T3 = Thermostatic Steam Traps

F1 = Float and Thermostatic Trap

A1, A2 = Main Air Vents

S1 = Outdoor Sensor 070

S2 = Condensate Sensor 071

Summary of content (4 pages)

PAGE 1
- Application Brochure A 279 12/07 Steam Control 279 Application A 279-1 System Description: The Steam Control 279 regulates the indoor temperature based on firing time of the steam boiler. The firing time of the steam boiler is based on outdoor temperature, condensate return temperature and control settings. The condensate return sensor provides information to the control to determine when the boiler has produced enough steam to reach the furthest radiator and to start the percent boiler on time.
PAGE 2
Application A 279-2 System Description: The Steam Control 279 regulates the indoor temperature based on firing time of the steam boiler. The firing time of the steam boiler is based on outdoor temperature, condensate return temperature, user control settings and indoor sensors. The condensate return sensor provides information to the control to determine when the boiler has produced enough steam to reach the furthest radiator to start the boiler percent on time.
PAGE 3
Application A 279-3 System Description: The Steam System includes two on /off steam valves, each of which are operated by a Steam Control 279. The steam can be supplied from either a steam boiler or a district steam system. The on time of the valve is based on outdoor temperature, condensate return temperatures, control settings, and indoor temperature settings.
PAGE 4
Speciﬁcations: The following are the recommended specifications for the Steam Control 279 • The control shall be able to operate a single steam boiler or an on-off steam valve. • The control shall use an outdoor reset algorithm to determine the steam heating system on time during a heating cycle. • The control shall measure the outdoor air temperature using a sensor and display the measured outdoor air temperature on the display.