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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) The Outdoor Sensor (S3) and the Mix Supply Sensor (S2) are required if the Outdoor Reset feature is selected.
6) Connect the tankless aquastat (A1) if you are not using a storage tank. If you are using a storage tank with the tankless
heater, use the storage tank aquastat.
7) 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
S1
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
P1
Boiler
C1
CW - Closed to System
C1
CW - Open to System
NL1 L1
Z1...Z3
R
9
R
10
N
11
24 Volt Output
NL1 L1
2
1
8
7
3
4
5
6
S1
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
P1
Boiler
C1
CW - Open to System
NL1 L1
Z1...Z3
R
9
R
10
N
11
24 Volt Output
NL1 L1
P2
A1
2
1
8
7
3
4
5
6
2
1
8
7
3
4
5
6
Breaks on
Temp. Rise
A1
Breaks on
Temp. Rise
P2
C1
CW - Close
to System
R1
R1
R2
A1 = Tankless Coil or Storage Tank
Aquastat
C1 = Mixing Valve Actuating Motor
P1 = Boiler Circulator
P2 = Tankless Coil System Circulator
R1 = Relay (Required with and
without priority)
R2 = Relay (Required for priority)
S1 = Boiler Return Sensor
S2 = Mix Supply Sensor 071
S3 = Outdoor Sensor 070
Z1...Z3 = Zone Valves, Zone Relays,
Thermostats or BMS Signal
A2. 3-way RTC in Primary/Secondary - Heating and DHW using Tankless Coil; with/without Outdoor Reset
(Electrical)
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