tekmar 274 Boiler Control - Manual

274_D
11/12
- Data Brochure
Boiler Control 274
1 of 44 © 2012 274_D - 11/12
The Boiler Control 274 operates up to four on/off boilers to provide outdoor reset operation, domestic hot water and setpoint
operation with priority. When operating as a tN4 System Control, the 274 can connect with up to 24 tN4 devices on a single
boiler bus. The 274 has primary pump sequencing capabilities along with a flow proof or combustion air damper proof
demand.
tN4 Compatible
24 Hour, 5-1-1, 7 Day Schedule
Flow or Combustion Air Proof
Four On/Off Boilers
Equal Run Time Rotation •
•
•
•
• Primary Pump Sequencing
DHW Operation
Optional DHW Sensor
Setpoint Operation •
•
•
•
Additional functions include:
Input
Universal
Sensor
Included
Input
Universal
Sensor
Included
tN4
Boiler
Bus
Input
Outdoor Sensor
Included
OR
0-10 or 2-10 V (dc)
from EMS
Output
Up to 4
On/Off Boilers
Input
115 V (ac)
Power Supply
Input
Flow OR
C.A. Proof
Output
Up to 2
Boiler Pumps
Output
DHW Pump
OR
Primary Pump
Output
Combustion
Air Damper
OR Alert
OR
OR
Output
Primary
Pump
Input
DHW OR
Setpoint
Demand
Signal
Input
Boiler
Demand
Signal
Primary DHW 1
13
24
VIEW
Demands
Setback
Boiler Control 274
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
Dat
e Code
H2050A
Signal wiring must be rated at least 300 V.
DHW
23
/Setp
Com
24
Dem
Pr.
25
Dem
2 5 1 3
– +
4 6
BRet/ Com tN4 Boil Out Com Prim
P1 L N
20
Power
22 21 8 7
Do not apply power
18
DHW
/ P2
17 19 10 9 12 11 14 13 16 15
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