Install Instructions

ManualsBrandsCaleffi ManualsHeating Supplies1-1/4" Male NPT ThermoMix Thermostatic Mixing Valve (130°F)

www.caleffi.com

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.

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.

Changeable thermostatic sensor cartridges modifies the valve

temperature 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.

Product range

280 series boiler protection valve. NPT male or sweat union, sizes

1”, 1-1/4”.

Technical Characteristics

· Materials: - Body: brass

- Lower body plug: brass

- Shutter: polysulfone

- Spring: stainless steel

- Seal: EPDM

- Union seals: non-asbestos fiber

- Thermostatic sensor: wax

· Suitable fluids: water, glycol solutions

· Max. percentage of glycol: 50%

· Max. working pressure: 150 psi (10 bar)

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

· Thermostatic element setpoint: 130°F (55°C) standard

115°F(45°C), 140°F(60°C),

160°F(70°C) optional cartridges (field replaceable)

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

· By-pass from boiler complete closing

temperature: Tset + 18°F (+ 10°C)

· Cv: size 1”...10 Cv

size 1 1/4”.. 14 Cv

· Connections: - NPT male union: 1” and 1 1/4”

- sweat union: 1” and 1 1/4”

ThermoMix™ boiler protection high-flow thermostatic mixing valve

280 Series

NA10292.01

Installation, commissioning and servicing instructions

Summary of content (4 pages)

PAGE 1
NA10292.01 www.caleffi.com ThermoMix™ boiler protection high-flow thermostatic mixing valve 280 Series © Copyright 2013 Caleffi Installation, commissioning and servicing instructions 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.
PAGE 2
SAFETY INSTRUCTION This safety alert symbol will be used in this manual to draw attention to safety related instructions. When used, the safety alert symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN A SAFETY HAZARD. CAUTION: All work must be performed by qualified personnel trained in the proper application, installation, and maintenance of systems in accordance with all applicable codes and ordinances.
PAGE 3
Installation Assembly and disassembly should always be conducted when the system is cold and not under pressure. Accessibility: it is essential to provide unobstructed access to the valve for maintenance of the valve or fittings. 1) The valve can be installed on both sides of the boiler, left- or right side, in any position, vertical or horizontal. 1 2) Installation is recommended on the return to the boiler in mixing mode (boiler protection).
PAGE 4
Maintenance/Setting change The thermostatic element cartridge with thermostatic sensor can be easily removed for maintenance or set point change, without removing the valve body from the pipe if not installed vertically (1c) or horizontally on its side (1d), as follows: - isolate the ThermoMix boiler protection thermostatic mixing valve from the system - if the valve is installed on a vertical pipe (1c) or laying on a horizontal pipe (1d), remove the valve from the pipe - unscrew the lower body plug - take