ES-T-294EXP
Submittal
Designer__________________________ Contact___________________________
Job ______________________________
Smart Boiler Expansion 294EXP
The Smart Boiler Expansion 294EXP expands the Smart Boiler Control 294 in groups of four boilers up to a maximum of sixteen boilers.
The 294EXP connects to the Smart Boiler Control 294 through a three-wire communication cable.
Front View
Side View
+ Gnd
Expansion
1 2
3
Class 2 Circuits
Expansion 5 to 8
Set switches: 1 to Off, 2 to Off
Boiler Expansion 5 to 8
CAN ICES-3 (A)/NMB-3(A)
Boiler
9"
(229 mm)
For product literature:
Pour la documentation
du produit:
Watts.com/tekmar
6
6
7
7
8
8
Input Power:
115 V (ac) ±10%, 60 Hz, 6 W
Relays:
230 V (ac), 5 A, 1/3 hp
Operating Temperature:
32°F to 122°F (0°C to 50°C)
5
Boiler 5
+ Mod
6
DANGER
To Reduce the Risk of Electric
Shock - Do not connect to a
circuit operating at more than
150 volts to ground.
Pour réduire les risques
d'électrocution choc - ne pas
raccorder à un circuit
fonctionnant à plus de 150 V à
la terre.
Smart Boiler Expansion 294EXP
Boiler Mod:
Class 2 Circuits
4
5
Use Copper Conductors Only
tektra 1152-01
Designed and assembled
in Canada
H2062B
Pump/Valve
5
7
8
9 10 11
Boiler 6 Boiler 7 Boiler 8
+ Mod
+ Mod
+ Mod
12 13 14 15 16 17 18 19
Boiler 5
Enable
Boiler 6
Enable
Boiler 7
Enable
Boiler 8
Enable
20 21 22 23 24 25 26 27
Boiler 5 Boiler 6 Boiler 7 Boiler 8
Pump/Vlv Pump/Vlv Pump/Vlv Pump/Vlv
28 29
Power
L
N
8"
(203 mm)
211 ⁄ 32"
(60 mm)
Features
Specifications
• Expansion for 4 boilers
• LED status indicators
• 3-wire communication
Smart Boiler Expansion 294EXP
Literature
Submittal, Installation and Operating Manual
Packaged weight
2.4 lb. (1100 g)
Dimensions
9" H x 8" W x 211⁄ 32" D (229 x 203 x 60 mm)
Enclosure
Blue ABS plastic, NEMA type 1
Approvals
CSA C US, RoHS, Meets Class B: ICES & FCC Part 15
Ambient conditions
Indoor use only, 32 to 122°F (0 to 50°C), RH ≤90% non-condensing,
Altitude < 6560 feet (2000 m), Installation Category II, Pollution Degree 2
Power supply
115 V (ac) ±10%, 60 Hz, 6 W
Relays
230 V (ac), 5A, 1/3 hp
Modulating outputs
0-10 V (dc) 500 Ω minimum load impedance
or 4-20 mA 1 kΩ max load impedance
Warranty
Limited 3 Year (See IOM for full warranty)
tekmar product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please
contact tekmar Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior
notice and without incurring any obligation to make such changes and modifications on tekmar products previously or subsequently sold.
Sample Application Drawing
Sample Mechanical diagram
294EXP
294
S1
S4
Boilers 5 to 8
P2
Boilers 1 to 4
B5
V1
B1
P3
S2
BP5
S3
P1
BP1
To 294
Sample Electrical diagram
-
Legend
+ Gnd
+ Gnd
Expansion
1 2
Class 2 Circuits
3
Expansion 5 to 8
Set switches: 1 to Off, 2 to Off
Boiler Expansion 5 to 8
CAN ICES-3 (A)/NMB-3(A)
Boiler
For product literature:
Pour la documentation
du produit:
Watts.com/tekmar
Pump/Valve
5
5
6
6
7
7
5
6
A1 = Setpoint Load Call
B1...B4 = Boiler On-Off Enable 1 to 4 (294)
BP1...BP4 = Boiler Pumps 1 to 4 (294)
M1...M4 = Boiler Modulation Signal 1 to 4 (294)
B5...B8 = Boiler On-Off Enable 5 to 8 (294EXP)
BP5...BP8 = Boiler Pumps 5 to 8 (294EXP)
M5...M8 = Boiler Modulation Signal 5 to 8 (294EXP)
S1 = Outdoor Sensor 070
S2 = Boiler Supply Sensor 082
S3 = Pressure Sensor 088 (Optional)
S4 = DHW Sensor 078
P1 = System Pump
P2 = DHW Pump
P3 = Setpoint Load Pump
V1 = Zone Valves
Smart Boiler Expansion 294EXP
Boiler Mod:
Class 2 Circuits
Boiler 5
+ Mod
DANGER
To Reduce the Risk of Electric
Shock - Do not connect to a
circuit operating at more than
150 volts to ground.
Pour réduire les risques
d'électrocution choc - ne pas
raccorder à un circuit
fonctionnant à plus de 150 V à
la terre.
8
8
4
Input Power:
115 V (ac) ±10%, 60 Hz, 6 W
Relays:
230 V (ac), 5 A, 1/3 hp
Operating Temperature:
32°F to 122°F (0°C to 50°C)
Use Copper Conductors Only
tektra 1152-01
Designed and assembled
in Canada
H2062B
A1
7
8
9 10 11
Boiler 6 Boiler 7 Boiler 8
+ Mod
+ Mod
+ Mod
12 13 14 15 16 17 18 19
Boiler 5
Enable
Boiler 6
Enable
Boiler 7
Enable
Boiler 8
Enable
20 21 22 23 24 25 26 27
28 29
Boiler 5 Boiler 6 Boiler 7 Boiler 8
Pump/Vlv Pump/Vlv Pump/Vlv Pump/Vlv
Power
L
N
NOTICE
+ -
+ -
+ -
+ -
M5 M6 M7 M8
T T
T T
T T
L
N
G
T T
B5 B6 B7 B8
L N
L N
G
BP5
G
BP7
L N
BP6
G
L N
G
The information contained herein is not intended
to replace the full product installation and safety
information available or the experience of a trained
product installer. You are required to thoroughly
read all installation instructions and product safety
information before beginning the installation of
this product.
BP8
Tel: 1-800-438-3903 • F: (250) 984-0815
tekmarControls.com
ES-T-294EXP 2214
© 2022 tekmar
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