Application Brochure

11 of 12
- Application
Boiler Control 256 and Mixing Control 356
A 356-6
05/00
Copyright ©2000 A 356-6 05/00
Note:
This is only a concept drawing. The designer must determine whether this application will work in his system and must ensur
e compliance with code requirements. Necessary auxiliary equipment,
isolation relays (for loads greater than the specified tekmar internal relay ratings), and other safety and limit devices must
be added.
Mechanical
M
M
M
M
Outdoor
Sensor (S2) 070
Outdoor
Sensor (S4) 070
DHW
Tank
see Essay E 021
∆P
356
Mix
Sensor
(S3) 071
Boiler
Sensor
(S1) 071
P1
P2
P4
A1
A2
Boiler Return
Sensor (S5) 071
V1
P3
R1
V2
R2
R3
T1T2
Z1Z2
T3
Z3
T4
Z4
Class II
Transformer
24 V (ac)
120 V (ac)
256
S1
S2
Boiler
S4
S5
S3
256
5
7
9
86
T
5A
Boiler
R+
C-
Power
Do not apply power
2
Sw
UnO
Out
3
Boil
14
Com
U1
3
4
6
5
7
2
1
8
3
4
6
5
7
2
1
8
3
4
6
5
7
2
1
8
24 V (ac)
120 V (ac)
Class II
Transformer
L
C
R
P4
P1
A1
A2
P2
P3
R1
R2
R3
Zone Valve
Motor End
Switches
Zone Valve
Motor End
Switches
Z2
Z1
Z4
Z3
N
356
5
7
9
8
6
T
5A
Boiler
R+
C-
Power
Do not apply power
2
Out
3
Sup
Com
14
Boil
2.4A
Electrical
A1 = DHW Aquastat
A2 = DHW High Limit Aquastat
P1 = Boiler Pump
P2 = DHW Pump
P3 = Variable Speed Injection Pump
P4 = Mixing System Pump
R1, ..., R3 = Relay 003
S1 = Boiler Supply Sensor 071
S2, S4 = Outdoor Sensor 070
S3 = Mix Supply Sensor 071
S5 = Boiler Return Sensor 071
T1, ..., T4 = Thermostats
V1 = Balancing or Globe Valve
V2 = Balancing Valve or Pressure Bypass Valve
Z1, ..., Z4 = Zone Valve Motor End Switches