Giacomini R158A User manual

1
0741EN February 2018
Components for boiler room
TemperaTure limiTer
r158a
Technical data
• Temperature range: 35÷65 °C
• Max. media temperature: 85 °C
• Max. ambient temperature: 60 °C
• Max. working pressure: 10 bar
• Max. dierential pressure: 1 bar
• Material:
Insert
- Cartridge: PPS, Polyphenylene sulde
- Element: Wax
- Body: brass CW617N
- Spring: Stainless steel AISI 302
- Internal components: PPS, Polyphenylene sulde
- O-Rings: EPDM
Valve
- Body: brass CW617N
Loss of pressure
10010 1000
10
100
1000
2000
∆p [mm H20]
Q [l/h]
Kv = 1,1
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.
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 ush the system
regularly, ushing one branch at a time for a recommended period of time.
Versions and product codes
Product code Hydraulic connections Actuator connection
R158AY004 3/4”F ISO228 M30 x 1,5 mm
R158A

2
0741EN February 2018
Components for boiler room
TemperaTure limiTer
r158a
Installation
For the hydraulic installation please respect the arrow on the brass body.
For all threaded connections please clear threads on both valve and piping of
debris. Sealant such as pipe dope or teon tape is recommended.
Warning.
When using hemp as pipe sealant, ensure no strands are left in the
valve or piping.
Insulation
For the valve to work eciently, a certain heat loss must be present, and
since the pipes are normally insulated, insulation of the valve is not necessary.
Without insulation of the valve, the valve will operate under optimal working
conditions and temperature regulation will be more accurate.
If insulation is required the valve will still function, but regulation will be less
precise.
Dimensions
B
C D
A A
Product code A B [mm] C [mm] D [mm]
R158AY004 3/4” 80 31 97
Product specications
R158A
Temperatur limiter for domestic hot water installations with recirculation
or heating systems. The valve automatically controls the temperature of
the water that circulates through it and therefore the thermal balance
is ensured throughout the system. Temperature range: 35÷65 °C. Max.
media temperature: 85 °C. Max. ambient temperature: 60 °C. Max. working
pressure: 10 bar. Max. dierential pressure: 1 bar.
Additional information
For more information, go to www.giacomini.com or contact our technical assistance service: '[phone]+39 0322 923255 *[email protected]
This document provides only general indications. Giacomini S.p.A. may change at any time, without notice and for technical or commercial reasons, the items included herewith.
The information included in this technical sheet do not exempt the user from strictly complying with the rules and good practice standards in force.
Giacomini S.p.A. Via per Alzo, 39 - 28017 San Maurizio d’Opaglio (NO) Italy