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ManualsBrandsTekmar ManualsHeating SuppliesTwo Stage Setpoint Control

Table Of Contents

Electrical

Mechanical

- Application

Note:

This is only a concept drawing. Designers must determine whether this system will work in each application and must ensure

compliance with code requirements. Necessary auxiliary equipment and safety devices must be added.

Two Stage Setpoint Control 152

A 152-1

12/93

120Vac

Class II

Transformer

120Vac

24Vac

Relay

(R1) 003

152

DHW Pump (P1)

DHW Sensor (S1) 071

DHW

Tank

Low/High

Fire Boiler

4 56789

Power

Relay 1

Com

Sen

Relay 2

152

24V only

No Power

(Low) (High)

Low/High Fire Boiler

P1 = DHW Pump

R1 = Relay 003

S1 = DHW Sensor 071

10A 10A

—

Off

24Vac

Class II

Transformer

Summary of content (6 pages)

PAGE 1
- Application A 152-1 12/93 Two Stage Setpoint Control 152 Mechanical 152 Class II Transformer 120Vac 24Vac Relay (R1) 003 DHW Tank Low/High Fire Boiler DHW Pump (P1) DHW Sensor (S1) 071 Electrical P1 = DHW Pump R1 = Relay 003 S1 = DHW Sensor 071 10A On 1 2 — Power Off C 152 10A 24V only No Power 3 4 R Relay 1 5 6 7 8 9 Com S1 S2 Relay 2 Sen Sen Sen S1 7 8 1 2 6 5 4 3 R1 (Low) (High) Low/High Fire Boiler Class II Transformer P1 24Vac 120Vac C R L N Note: This is only a conc
PAGE 2
A 152-1 Operation The Two Stage Setpoint Control 152 maintains a selected domestic hot water (DHW) tank temperature by staging a low/high fire boiler. The target DHW temperature in this example is 140°F (60°C). The low fire burner and DHW pump are turned on when the water temperature drops below 137°F (58°C) — Setpoint 1 setting at 140°F, differential at 6°F. The high fire burner is turned on when the water temperature drops below 134°F (57°C) — Setpoint 2 setting at 137°F, differential at 6°F.
PAGE 3
- Application A 152-2 12/93 Two Stage Setpoint Control 152 Mechanical 152 Class II Transformer 120Vac 24Vac Relay R1 003 Relay R2 003 Spa Heat Exchanger Pump (P2) Pool Pool Sensor (S1) 071 Pool Pump (P4) to other heating zones Spa Spa Pump (P5) Spa Sensor (S2) 071 Pool Heat Exchanger Pump (P3) Max. 4 pipe diameters apart Max.
PAGE 4
A 152-2 Operation The Two Stage Setpoint Control 152 for the pool regulates the temperature of the pool water by turning its heat exchanger pump on or off to regulate the amount of heat transfer from the heat exchanger to the pool. The Two Stage Setpoint Control 152 for the spa regulates the temperature of the spa water by turning on or off the spa heat exchanger pump to control the heat transfer from the heat exchanger to the spa.
PAGE 5
- Application A 152-4 12/93 Two Stage Setpoint Control 152 Mechanical 152 Class II Transformer 120Vac 24Vac Relay (R1) 003 Fan Coil Pump (P1) Room Sensor (S2) 074 M Fan Coil Slab Sensor (S1) 072 or 073 Injection Valve Slab Pump (P2) Max.
PAGE 6
A 152-4 Operation The Two Stage Setpoint Control 152 maintains a separate setpoint temperature for each of two independant heating systems in a single area. Setpoint 1 uses the reading from its Slab Sensor 072 or 073 to maintain the slab at a fixed temperature setting. Setpoint 1 should be set lower than the desired air temperature, or air conditioning may be required in milder weather.