Submittal Sheet

Job __________________________
Designer ______________________
Contact _______________________
www.tekmarcontrols.com  of 2 © 20 C 279 - 0/
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0/
HVAC Systems Replaces: New
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Front View
Side View
2–7/8”
(72 mm)
1/2” Knock-out
(x 5 back) (x 5 bottom)
Mounting Base
CL
1/2”
(13 mm)
7/8”
(23 mm)
6–5/8”
(170 mm)
7–5/8”
(193 mm)
1–7/8” (49 mm)
1/2”
(14 mm)
3/16” (5 mm)
 ------------
Outdoor Temperature Reset
Warm Weather Shut Down
Built-in programmable timer
Indoor Temperature Feedback (with
optional indoor sensor)
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Manual Override
Includes outdoor sensor
Includes condensate sensor
Large LCD display
DHW tankless coil operation
24 hour, 5--, 7 day schedule
Two or four schedule events per day
Two alert level relays
CSA approved for use in USA and Canada
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 -----------------------------------------------------
The Steam Control 279 is designed to operate a single steam boiler using outdoor reset. It can be used in single pipe steam applications
as well as applications using a tankless DHW coil. This control regulates the on time of a steam boiler through outdoor reset control.
It is capable of controlling a single on/off steam boiler.

N / A
DHW Tankless Coil Sensor
Condensate Sensor
Average
Indoor S2
Indoor S1
Alert 2
LowHigh

One Stage
Menu Item
Test
Power 115 V ±10% 50/60 Hz 3.5 VA
Relays 230 V (ac) 5 A 1/3 hp, pilot duty 240 VA
Made in Canada By
tekmar Control Systems Ltd.
tektra 969-04
For manual operation,
press and hold Test
button for 3 seconds.
not testing
testing
testing paused
off
red
red
User
Installer
Setback
Off
Date Code
H2046A
2
N
3
Alert 1 Boiler
4
Power
L
Indr
2
S2
DHW

Sen
Com
0
Sen
Com
9
Sen
Indr
3
S1
6 7 85


Out
Sen
6
Cdn
Sen
5
Com
Sen
4
STATUS
Establishing Steam
Heat Cycle
Lockout Differential
DHW Tankless Coil Heating
Meets Class B:
Canadian ICES
FCC Part 15
Signal wiring must be rated at least 300 V.
One Stage
Literature D279, A279, D00, D070
Control Microprocessor control. This is not a safety (limit) control
Packaged weight 3.3 lb. (500 g)
Dimensions 6-5/8” H x 7-9/6” W x 2-3/6” D (70 x 93 x 72 mm)
Enclosure Blue PVC plastic, NEMA type 
Approvals CSA C US, meets Class B: ICES & FCC Part 5
Ambient conditions
Indoor use only, 32 to 22°F (0 to 50°C), RH ≤90% Non-
condensing, Altitude <6560 ft. (2000 m), Installation
Category II, Pollution Degree 2
Power supply 5 V (ac) ± 0%, 50/60 Hz, 3.5 VA
Relays 230 V (ac) 5 A, /3 hp, pilot duty 240 VA
Sensors NTC thermistor, 0 kΩ @ 77°F (25°C ±0.2°C) ß=3892
–Included Outdoor Sensor 070 and Universal Sensor 07
–Optional tekmar type #: 07, 076, 077, 078, 082, 084
Warranty Limited 3 Year (See D279 for full warranty)