Product Overview

ManualsBrandsCaleffi ManualsHeating Supplies1" Male NPT ThermoMix Thermostatic Mixing Valve (140°F)

Function

Technical specifications

Product range

Code 280xxxA Boiler protection high-flow thermostatic mixing valve with 140ºF cartridge, threaded and sweat connections sizes 1”, 1-1/4”

Code F29633 Themostatic sensor cartridge 115º F

Code F29634 Themostatic sensor cartridge 130º F

Code F29635 Themostatic sensor cartridge 140º F

Code F29636 Themostatic sensor cartridge 160º F

series 280

ThermoMix

™

boiler protection

high-flow thermostatic mixing valve

CALEFFI

The ThermoMix

™

boiler protection high-flow thermostatic mixing

valve is used in hydronic heating systems with non-condensing

boilers, including solid fuel, biomass, gas, LP or oil-fired. It can be

installed with steel, cast iron and copper tube style boilers,

automatically controlling the return water temperature, preventing

condensation of the water vapor contained in the flue gas.

The 280 series ThermoMix valve mixes bypass flow from the boiler

with return flow from the system, sending a fixed temperature flow to

the boiler which protects against corrosion from condensation

occurring when a minimum flue gas temperature is not otherwise

maintained.

Changable thermostatic sensor cartridges modifies valve tempera-

ture setting. The thermostatic sensor cartridge can easily be

removed for maintenance or to change the valve set temperature,

with out removing the valve body from the piping.

Materials

Body and lower body plug: brass

Shutter: polysulfone

Spring: stainless steel

Seal: EPDM

Union seals: non-asbestos fiber

Thermostatic sensor: wax

Performance

Suitable fluids: water, up to 50% glycol solutions

Max working pressure: 150 psi (10 bar)

Working temperature range: 40-212°F (5-100°C)

Thermostatic sensor cartridge: 140°F (60°C) standard

115°F (45°C), 130°F (55°C), 160°F (70°C) optional cartridges

Sensor cartridge accuracy: ±3.6°F (±2°C)

By-pass from boiler complete

closing temperature: Tset +18°F (10°C)

Cv: size 1”... 10Cv

size 1-1/4“ ... 14Cv

Connections: - NPT male union 1” and 1¼”

- sweat union 1” and 1¼”

Code A B C D E F

280166A 1”

NPT 3 1/2” 7” 6” 1 5/8” 4 3/8”

280966A 1”

SWT 3 1/2” 7” 6” 1 5/8” 4 3/8”

280176A 1

1/4” NPT 3 13/16” 7 5/8” 6 3/16” 1 9/16” 4 3/8”

280976A 1

1/4” SWT 3 13/16” 7 5/8” 6 3/16” 1 9/16” 4 3/8”

Dimensions

140º F

150 psi

Summary of content (2 pages)

PAGE 1
ThermoMix™ boiler protection high-flow thermostatic mixing valve CALEFFI series 280 Function The ThermoMix™ boiler protection high-flow thermostatic mixing valve is used in hydronic heating systems with non-condensing boilers, including solid fuel, biomass, gas, LP or oil-fired. It can be installed with steel, cast iron and copper tube style boilers, automatically controlling the return water temperature, preventing condensation of the water vapor contained in the flue gas.
PAGE 2
Construction details Characteristic components The brass body prevents the formation of ferrous residues in the system, prolonging boiler operating life. Bypass from boiler The thermostatic sensor can be easily replaced for maintenance or set point change.