The Boiler Control 256 is designed to control a single stage heat source in order to provide outdoor reset. The control has a Liquid
Crystal Display (LCD) to view system status and operating information.
• Test sequence to ensure proper boiler operation
• Setback input for energy savings
• CSA C US certified (approved to applicable UL standards)
Additional functions include:
• 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
Input
Outdoor Sensor
Included
Input
Universal Sensor
Included
Input
24 V (ac)
Power Supply
Output
Boiler
Input
tekmar Timer
Optional
BOIL
F
OCC
Input
Boiler Demand
Signal
PRGM
S
T I M E
AMPM
UNOCC
OVR
S
M
W T F
T
1
2
Press & Release:
all 3 buttons, to adjust menu
Press & Hold:
Item
, to view settings
, to test.
Boiler Control 256
One Stage Boiler
Item
Date Code
Power: 24 V ±10% 50/60 Hz
3 VA Class 2
Relay: 240 V (ac) 5 A 1/6 hp
Meets Class B:
Canadian ICES
FCC Part 15
H1
190D
Terminal Unit
Boiler Demand
Inst / A
dv
1
Boil
2
Out
3
Com
4
UnO
Sw
5
Boiler
6 7
T
8
Power
R+
9
C-
Do not apply power
tektra 909-01
Designed &
Assembled in
Canada
Signal wiring
must be rated
at least 300V
Note:
Boiler demand must have
an electrical closure
between terminals 7
and 9 before the boiler
is able to fire.
© 2019 tekmar 256_D - 09/19
256_D
09/19
HVAC Systems Replaces: 06/16
Boiler Control 256
Installation & Operation Manual
