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Burnham RTC (Return Temperature Control) Manuel d'installation Page 43

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A9. 3-way Multiple Boiler RTC in Primary/Secondary - Heating and DHW using Indirect Water Heater on Primary Loop;
Using Sequencer with & without Outdoor Reset (Electrical)
NOTES:
1) Refer to the I&O to determine correct valve orientation and actuator wiring.
2) 120 VAC supplying the RTC should be separate from the burner/boiler circuit.
3) Heat demand can be any electrical signal consisting of 24 - 240 VAC.
4) Use isolation relays for circulators greater than 1/3 HP. Use motor starters for 3 phase circulators.
5) System Pump (P3) to be operated by zone relay or other installer supplied device.
This diagram is for reference only. The installer or designer is responsible for the proper selection and design
of the system.
C
24 V (ac)
R
N
120 V (ac)
Class II
Transformer
L
S2
S3
Do not apply power
10A
Boil
Ret
Com Mix OutCom
L
12 13 14 15 16
Boil
Pmp
N
6
Burnham RTC
3 5
R
9
R
10
N
11
N
4
Power
10A
24 Volt Output
7 8
Boiler
Enable
1 2
Heat
Demand
P2
Z1...Z3
R
9
R
10
N
11
24 Volt Output
Do not apply power
1
Com
2
Boil
Sup
3
Boil
Ret
4
Out
5
UnO
Sw
6
Boil
Dem
7
Com
Dem
8
Setp/
DHW
9
Power
N L
Prim
P1
12
C.A./
Alarm Pmp/Vlv
13 14
Relay
1
15
10 11
1
16
Relay
2
17
2
18
Relay
3
19
3
20
Relay
4
21
4
22
DHW
23
264
5A 5A 5A 5A 5A 5A 5A
S1
S4
Do not apply power
10A
Boil
Ret
Com Mix OutCom
L
12 13 14 15 16
Boil
Pmp
N
6
Burnham RTC
3 5
R
9
R
10
N
11
N
4
Power
10A
24 Volt Output
7 8
Boiler
Enable
1 2
Heat
Demand
P1
C1
CW - Open to System
R
9
R
10
N
11
24 Volt Output
NL1 L1
C1
CW - Closed to System
NL1 L1
P3
2
1
8
7
3
4
5
6
A1
Breaks on
Temp. Rise
P4
(Low) (High)
Boiler #2
(Low) (High)
Boiler #1
See 9,
10 & 11
at right
See 9,
10 & 11
at right
R1
A1 = Indirect Hot Water Aquastat
C1,C2 = Mixing Valve Actuating Motor
P1,P2 = Boiler Circulator
P3 = System Pump (runs on
call for heat)
P4 = Indirect Circulator
R1 = Relay
S1,S2 = Boiler Return Sensor
S3 = Mix Supply Sensor 071
S4 = Outdoor Sensor 070
Z1...Z3 = Zone Valves, Zone Relays,
Thermostats or BMS Signal
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