Honeywell SAF25 PRODUCT DATA

DIMENSIONS

SAF25

SUN COMPENSATOR - SOLAR SENSOR

PRODUCT DATA

APPLICATION

The SAF25 Sun Compensator – Solar Sensor is an active sensor with standard output signal (0...10 V). The heating consumption of a room depends largely on the outside temperature. This relationship is taken into consideration by the weather-responsive supply temperature controller when regulating the heat supply.

In addition, the heating consumption depends on solar radiation. On bright days, the indoors are also heated by the sun, thereby making it possible to reduce heating and energy. It is therefore recommended that you separate the heating circuit of a building into north and south zones in order to take into consideration the effect of the sun on the south side when heating the building.

The heating supply temperature will be reduced to compensate for increasing solar radiation according to the measurements of the SAF25.

The SAF25 contains two temperature sensors to register solar radiation (see Fig. 1). The temperature sensor (1) measures the ambient temperature and the solar sensor (2) measures the radiation from the sun. The difference between the two temperatures represents the additional heating of the building by the sun.

TYPE

30 mm

95 mm

44 mm

70 mm 65 mm

5.5 mm

Fig. 1. Dimensions (mm)

SAF25

SAF25 – PRODUCT DATA

MOUNTING

The SAF25 should be mounted so as to measure the same solar radiation as that of the room to be controlled. Therefore, for sun compensation, a separate sensor has to be installed for each control loop.

Press in the clasp (R) and pull off the top (H). Pull the clip (B) out of the housing (G). Screw on the clip (B) and put on the housing. To wire, unscrew the lid. Slide the top (H) over the housing until the clasp is firmly attached.

SAF25

1 2

0...10V10V=

Fig. 2. Mounting

ELECTRICAL CONNECTION

WARNING

The sensor in the lid is connected to the circuit board via two flexible wires. This connection must not be severed.

[ V ]

5.0

2.5

250

Fig. 3. Wiring

Connect + 10 V from the controller with which the sensor is connected to terminal 2, with the return at terminal 3. Terminal 4 is the sensor output and is connected to the appropriate controller input.

500

[W/m ]

TESTING

Both sensors can be tested by measuring the resistance: Solar sensor on terminals 1 – 2 Temperature sensor on terminals 1 – 3

The sensors must be disconnected from the controller and protected from the sun's rays before measuring the resistance.

Take care when measuring, as the solar sensors may be warm from the sun.

Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Rolle, Z.A. La Pièce 16, Switzerland by its Authorized Representative:

Automation and Control Solutions

Honeywell GmbH Böblinger Strasse 17 71101 Schönaich Germany Phone: (49) 7031 63701 Fax: (49) 7031 637493 http://ecc.emea.honeywell.com Subject to change without notice. Printed in Germany

EN0B-0642GE51 R0709