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- Application

Boiler Control 261

A 261-1

03/09

Note:

This is only a concept drawing. The designer must determine whether this application will work in his system and must ensure 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.

Electrical

P1 = Boiler Pump

S1 = Boiler Sensor 082

S2 = Outdoor Sensor 070

U1 = tekmar Timer 033 (optional)

V1 = Balancing Valve or Pressure Bypass Valve

120 V (ac)

261

12 4

5 9

Do not apply power

11 12 13 14 15

UnO

Power

1716

Com

Out

10A

Boiler

Demand

Setpoint

Demand

Boil

Pmp

Stage

Boil

Com

10A 10A

1122

Boiler

Mechanical

Outdoor

Sensor (S2) 070

Boiler

Sensor

(S1) 082

∆P

120 V (ac)

261

Return

Installer

Off

Rotate

Advanced

= Required

= Optional

Summary of content (8 pages)

PAGE 1
- Application A 261-1 03/09 Boiler Control 261 Mechanical 261 Outdoor Sensor (S2) 070 120 V (ac) T T T T Boiler Sensor (S1) 082 P1 ∆P V1 Electrical 10A 10A 261 10A Do not apply power P1 = Boiler Pump S1 = Boiler Sensor 082 S2 = Outdoor Sensor 070 U1 = tekmar Timer 033 (optional) V1 = Balancing Valve or Pressure Bypass Valve 1 2 3 4 5 6 7 8 9 10 11 12 Boiler Setpoint Power Boil Demand Demand L N Pmp N Stage 1 1 Stage 2 2 13 14 15 16 17 UnO Com Boil Out Com Sw S1 Rotate Return Advance
PAGE 2
A 261-1 03/09 System Operation The Boiler Control 261 provides partial or full outdoor reset to four (or more) thermostatic radiator valve zones. Constant circulation to the zones is provided by the boiler pump (P1). The boilers are staged as required to provide the supply water temperature that satisfies the load. Heat Source Details The heat source can be either high mass or low mass non-condensing or low temperature boilers.
PAGE 3
- Application A 261-2 03/09 Boiler Control 261 Mechanical 261 Outdoor Sensor (S2) 070 Class 2 Transformer 24 V (ac) 120 V (ac) R1 Z1 R2 Z2 T1 R3 Z3 T2 T3 Boiler Sensor (S1) 082 Electrical 10A 10A 261 10A Do not apply power R1, ..., R3 = Relay 003 S1 = Boiler Sensor 082 S2 = Outdoor Sensor 070 T1, ..., T3 = Thermostats U1 = tekmar Timer 033 (optional) Z1, ...
PAGE 4
A 261-2 03/09 System Operation The Boiler Control 261 provides partial or full outdoor reset to three (or more) boiler zones. The boilers are staged as required to provide the supply water temperature that satisfies the load. Heat Source Details The heat source can be either high mass or low mass non-condensing or low temperature boilers. Piping Details Thermostat controlled zone pumps are piped off the boiler loop as a secondary loop.
PAGE 5
- Application A 261-3 03/09 Boiler Control 261 & Setpoint Control 150 Mechanical 261 150 Outdoor Sensor (S2) 070 Class 2 Transformer 24 V (ac) 120 V (ac) R1 A1 P3 Pool Sensor (S3) 071 Heat Exchanger P2 Boiler Sensor (S1) 082 PWM P1 Electrical 150 8A 10A 10A On 1 2 3 4 — Power Off C- R+ Com N/O 261 10A No Power A1 = Pool or Spa High Limit Aquastat P1 = Boiler Pump P2 = Pool or Spa Pump P3 = Pool or Spa Recirc.
PAGE 6
A 261-3 03/09 System Operation The Boiler Control 261 provides partial outdoor reset to a single boiler zone. The Setpoint Control 150 controls the temperature of the pool or spa. The boilers are staged as required to provide the supply water temperature that satisfies the loads. Heat Source Details The heat source can be high mass or low mass non-condensing boilers. Piping Details A single boiler zone is permanently wired.
PAGE 7
- Application A 261-4 03/09 Boiler Control Mechanical 261 Outdoor Sensor (S2) 070 Class 2 Transformer 24 V (ac) 120 V (ac) R1 A2 P DHW Tank A1 Boiler Sensor (S1) 082 P1 Electrical 10A 10A 261 10A Do not apply power A1 = DHW Aquastat A2 = DHW High Limit Aquastat P1 = DHW Pump R1 = Relay 003 S1 = Boiler Sensor 082 S2 = Outdoor Sensor 070 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Boiler Setpoint Power Boil Demand Demand L N Pmp N Stage 1 1 UnO Com Boil Out Com Sw Stage 2 2 S1 Advanc
PAGE 8
A 261-4 03/09 System Operation The Boiler Control 261 provides control of two boilers for a dedicated Domestic Hot Water (DHW) storage system. Heat Source Details The heat source can be high mass or low mass non-condensing or low temperature boilers, or any boilers designed for this type of application. Piping Details The boilers are piped in reverse return in order to provide equal flow through each boiler.