Submittal Sheet

Job __________________________
Designer ______________________
Contact _______________________
www.tekmarcontrols.com  of 2 © 20 C 274 - 0/


0/
Multi-Staging 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 Temperature Reset
Setback built in for energy savings
Warm Weather Shut Down
Automatic Boiler Differential
tekmarNet
®
4 Compatible
 ----------------
Control up to 4 On-Off boilers
Primary pump sequencing
DHW pump 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
Pump exercising
Powered system pump output
Test sequence to ensure proper
component operation
5 V (ac) power supply
Optional boiler pump(s) operation
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
 -----------------------------------------------------
The Boiler Control 274 is designed to stage multiple boilers using Outdoor Temperature Reset. It can be used in applications ranging
from a single zone of baseboard, multiple baseboard and fan coil zones, to dedicated domestic hot water heating in commercial
buildings. This control regulates a single heating water temperature through Outdoor Temperature Reset and/or setpoint/DHW target
control. It is capable of controlling (stage and rotate) up to 4 on/off boilers as well as the system pump (pump sequencing option).

N / A
Demands
Setback

One tN4, Four Stage Boiler & DHW / Setpoint
Menu Item
Test
Boiler Demand
DHW / Setpoint Demand
Proof Demand
EMS Input Signal
Priority Override
Power 115 V ±10% 60 Hz 7 VA, 1150 VA max.
Relays 230 V (ac) 5 A 1/3 hp
Demands 20 to 260 V (ac) 2 VA
Made in Canada by
tekmar Control Systems Ltd
tektra 1020-02
Meets Class B:
Canadian ICES
FCC Part 15
For maximum heat,
press and hold Test
button for 3 seconds.
not testing
testing
testing paused
off
red
red
Off
EMS
Rotate
Fixed Last
Pump Sequencer
Exercise
Off
Date Code
H2050A
Signal wiring must be rated at least 300 V.
DHW
23
/Setp
Com
24
Dem
Pr.
25
Dem
2 5 3
–
+
4 6
BRet/
ComtN4
Boil
OutCom Prim
P1 L N
20
Power
22287

8
DHW
/ P2
7 909 2 43 65
Fixed Lead
First On / Last Off
First On / First Off
Relay
1
Relay
2
Relay
3
Relay
4
C.A. /
Alert
Boiler
Demand
Sup
DHW
Zone Load Shedding
1 Up to 4 On/Off Boilers
2 Up to 2 On/Off Boilers & 2 Pumps
3 Up to 2 Lo/Hi Boilers
4 1 Lo/Hi Boiler & 1 Pump
5 1 Three Stage Boiler & Pump
6 1 Four Stage Boiler
Modes
VIEW
 One tN4, Four Stage Boiler & DHW / Setpoint
Literature D274, A274, 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%, 60 Hz, 7 VA, 50 VA max
Relays 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
Warranty Limited 3 Year (See D274 for full warranty)