Burnham RTC (Return Temperature Control) Manuale di Installazione Scaricare il pdf (Pagina 42)

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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 (Mechanical)

120 V (ac)

24 V (ac)

Class II

Transformer

264

Outdoor Sensor

(S4) 070

Boiler Return

Sensor

(S1) 071

Boiler Return

Sensor

(S2) 071

Max

Indirect

DHW

Tank

RTC

A1 = Indirect Hot Water Aquastat

C1,C2 = Diverting Valve Actuating Motor

M1,M2 = By-Pass Mix Point

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 Senor 071

S4 = Outdoor Sensor 070

V1,V2 = 3-Way Diverting Valve

V3 = Ball Valve, Balancing Valve

Z1...Z3 = Zones

NOTES:

1) Install the boiler as indicated above for systems where return temperatures may be less than 135F and heating/DHW with an indi-

rect water heater.

2) The Outdoor Sensor (S4) and the Mix Supply Sensor (S3) are required when the Outdoor Reset feature is selected. An appropriate

sequencer must also be selected. The mix sensor must be installed 10 pipe diameters downstream of the system pump, in the primary

loop. The mix sensor must be secured to the surface of the pipe using a wire tie or similar device.

3) The by-pass piping, diverting valve and boiler circulator must be sized using the sizing charts found in Appendix B.

4) A domestic hot water priority could be used provided the diversion from the heating system loop does not impact the system

heater’s performance.

5) Closely spaced tees must connect the branch to the larger header. The Tee centerlines must be no greater than 4 times the larger

header pipe diameter.

6) The diverting valves, V1 & V2, must be no greater than 11 linear feet of pipe from the Return Sensor, S1 & S2.

7) There shall be a MINIMUM of 4 linear feet of pipe between the By-pass Mix Point, M1 & M2, and the Return Sensor, S1 & S2.

8) The balancing valves in the boiler return lines, V3, may be necessary in low head by-pass loop applications.

9) The indirect heater aquastat (A1) is a normally closed switch. Circuit breaks on temperature rise.

10) Expansion tanks, air scoops and other components left out for clarity.

11) Observe all applicable plumbing and electrical codes.

This diagram is for reference only. The installer or designer is responsible for the proper selection and design of the

system.

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Burnham RTC (Return Temperature Control) Manuale di Installazione Pagina 42

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