Giacomini R158A Quick Start Manual

C
omponents for boiler room
0741EN February 2018
T
emperaTure limiTer
r158a
Description
The R158A is designed for domestic hot water installations with recirculation
or heating systems.
The valve automatically controls the temperature of the water that circulates
through the valve and therefore the thermal balance is ensured throughout
the system.
Temperature setting is easy: simply remove the black top cover and set the
temperature by means of a 8 mm wrench.
If for example a water temperature of 55 °C is needed, the R158A is set to the
temperature of 55 °C. If the temperature of the circulating water is below 55
°C, the valve opens and more water will pass through. If the temperature is
higher than 55 °C, the valve closes.
The black top cap must be screwed tightly on the R158A to activate the
thermostatic control (and to avoid tampering).
The by-pass function can be carried out manually by removing the black top
cap. The by-pass will force the R158A to fully open and set the temperature
control out of action. This function is used to prevent bacterial problems
such as Legionella and therefore it is recommended to flush the system
regularly, flushing one branch at a time for a recommended period of time.
Versions and product codes
Product code Hydraulic connections
R158AY004 3/4"F
R158A
Actuator connection
M30 x 1,5 mm
ISO228
Technical data
• Temperature range: 35÷65 °C
• Max. media temperature: 85 °C
• Max. ambient temperature: 60 °C
• Max. working pressure: 10 bar
• Max. differential pressure: 1 bar
• Material:
Insert
- Cartridge: PPS, Polyphenylene sulfide
- Element: Wax
- Body: brass CW617N
- Spring: Stainless steel AISI 302
- Internal components: PPS, Polyphenylene sulfide
- O-Rings: EPDM
Valve
- Body: brass CW617N
Loss of pressure
2000
1000
100
10
10
Operation
Standard operation
The R158A is factory pre-set to 60 °C.
To change the temperature, remove the black cover and set the scale using a
8 mm wrench to the desired temperature between 35 °C and 65 °C.
Warning.
Please don't wind the R158A below 35 °C or above 65 °C in order to
keep the functionality of the R158A.
Re-install the top cover tightly to allow the thermostatic control to be working.
Please note that when changing the temperature setting, the according
adjustment may take some time to get the system in complete balance.
Manual By-pass Operation
When requiring manual by-pass operation simply remove the black top
cover; in this way the by-pass is fully open.
Warning.
Be careful not to lose the black cover to avoid being unable to return
to standard operation.
Kv = 1,1
100 1000
Q [l/h]
1