Submittal Sheet

Job __________________________
Designer ______________________
Contact _______________________
www.tekmarcontrols.com  of 2 © 20 C 268 - 0/
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0/
Multi-Staging 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)
Ø 3/16” (5 mm)
The Boiler Control 268 is designed to stage multiple boilers using Outdoor Temperature Reset. It can be used in applications ranging
from baseboard or mixed radiant heating systems, to dedicated domestic hot water heating in commercial buildings. This control
regulates a single heating water temperature through Outdoor Temperature and/or setpoint/DHW target control. It is capable of
controlling (stage and rotate) up to 9 on/off boilers as well as the system pump.

N / A
 ------------
Outdoor Temperature Reset
Setback input for energy savings
Warm Weather Shut Down
Automatic Boiler Differential
 ----------------
Control up to 9 On-Off boilers
Equipment Exercising
DHW pump or valve operation
Optional DHW priority
Equal Run Time Rotation
Automatic Boiler Differential
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
Powered system pump output
Test sequence to ensure proper
component operation
20 V (ac) power supply
Optional boiler pump(s) operation
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 -----------------------------------------------------
2
Com
Sup Ret Sw Dem Dem DHW N– + L P1 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 DHW
3
Boil Boil Out UnO Boil Com Setp/ Prim
4 5 6 7 8 9 0  2 3 4 5 6 7 8 9 20 2 22 23 24 25 26 2827 29 30 3

Nine Stage Boiler & DHW / Setpoint
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Signal wiring must be rated at least 300 V.
H2026C
Alarm
C.A. /Power Relay Relay Relay Relay Relay Relay Relay Relay Relay 9/
 
Rotate
Alarm
Off
Fixed Last
Off
Exercise
Adv
External Input
Stand Alone
Installer
C.A.
First On / Last Off
Fixed Lead
First On / First Off
Menu Item
Boiler Demand
DHW/Setpoint Demand
WWSD
Priority Override
External Input Signal
Offset
Mode
s
1
U
p to 9 On/Off Boil
er
s
2 U
p to 4 On/Off Boil
ers & 4 Pumps
3 U
p to 4 Lo/Hi Boil
er
s
4 U
p to 3 Lo/Hi Boil
ers & 3 Pumps
5 U
p to 3 Thr
ee Stage Boiler
s
6 U
p to 2 Thr
ee Stage Boilers & 2 Pum
ps
7 U
p to 2 F
our Stage Boiler
s
8 1
Fo
ur Stage Boiler & 1 Pum
p
Test
off
not t
estin
g
red
testin
g
red
testing paused
Fo
r
maximum
heat, press &
hold
Te
st
for 3
seconds.
943-01
Made in Canada by
tekmar Control Systems Ltd.
Power 115 V ±10% 50/60 Hz 600 VA
Relays 230 V (ac) 5 A 1/3 hp
Demands 20 to 260 V (ac) 2 VA
Date Code
Meets Class B:
Canadian ICES
FCC Part 15
Nine Stage Boiler & DHW / Setpoint
Literature D268, A268, 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
Power supply 5 V (ac) ±0%, 50/60 Hz, 600 VA
Relay 230 V (ac) 5 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, 2 of Universal Sensor 082, and 500 Ω
Resistor
–Optional tekmar type #: 033
Warranty Limited 3 Year (See D268 for full warranty)