Submittal Sheet

Job __________________________
Designer ______________________
Contact _______________________
www.tekmarcontrols.com  of 2 © 20 C 26 - 0/
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HVAC Systems Replaces: New

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)
Ø 3/16” (5 mm)
 ------------
Outdoor Reset
Setback input for energy savings
Warm Weather Shut Down
Automatic Boiler Differential
 ----------------
2 Stage boiler control
Quick setup for easy installation and
programming of control
User comfort adjustment to increase or
decrease building space temperature
Advanced settings to fine-tune building
requirements
Pump exercising
Powered boiler pump output
Test sequence to ensure proper
component operation
20 V (ac) power supply
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
N / A
Two Stage Boiler & Setpoint
Literature D26, A26, D00, D070
Control Microprocessor control. This is not a safety (limit) control
Packaged weight 3.0 lb. (340 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 3°F (0 to 45°C), RH ≤90% Non-
condensing
Power supply 20 V (ac) ±0%, 50/60 Hz, 300 VA
Relays 240 V (ac) 0 A, /3 hp
Demands 20 to 260 V (ac) 2 VA
Sensors NTC thermistor, 0 kΩ @ 77°F (25°C ±0.2°C) ß=3892
–Included Outdoor Sensor 070 and Universal Sensor 082
–Optional tekmar type #: 033
Warranty Limited 3 Year (See D26 for full warranty)
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Two Stage Boiler & Setpoint

58033

Boiler
Demand L N NL 1 1 2 2 Sw
2
Boil Uno Com Boil Out Com
3 4 5 6 7 8 9 0  2 3 4 5 6 7
Power
Stage Stage
Advanced
Installer Off
Rotate
Item
Test
Made in Canada by
tekmar Control Systems Ltd.
Power: 120 V ±10% 50/60 Hz 1300 VA
Relays: 240 V (ac) 10 A 1/3 hp, pilot duty 240 VA
Demands: 20 to 260 V (ac) 2 VA
Terminal Unit Setpoint
Fire Delay Setpoint Demand
Boiler Demand
Signal wiring must be
rated at least 300 V
Use supply wires suitable for
120°F (50°C ) above ambient
Setpoint
Demand
H11068
ROOM - Set to desired room temp.
OUTDR DSGN - Set to coldest (design)
outdoor temp.
Terminal Unit Set to
High Mass Radiant ------- 1
Low Mass Radiant ------- 2
Fan Coil ------------------ 3
Convector ---------------- 4
Radiator ------------------ 5
Baseboard --------------- 6
Setpoint - Set to desired setpoint temp.
Refer to brochure for more information
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To increase or decrease the
building temperature.
• Press the Item, , buttons
simultaneously for 1 sec. to
enter the ADJUST menu
• Use the, , buttons to adjust
the ROOM setting
Display defaults back to VIEW
menu after 20 sec.
The Boiler Control 26 is designed to stage multiple boilers using outdoor reset. It can be used in applications ranging from a single
zone of baseboard, multiple baseboard and fan coil zones, to dedicated setpoint heating in commercial buildings. This control regulates
a single heating water temperature through outdoor reset and/or setpoint target control. It is capable of controlling (stage and rotate)
up to 2 on/off boilers, or a single 2 stage boiler, as well as the system pump.