1. Repeat the procedure of recording and check-
ing supply temperatures. (The same type of
measuring equipment should be used).
2. If the temperature has the changed signifi-
cantly from the previously recorded valves,
check the following :
a) All inline or integral valve filters are
clear of obstruction.
b) All inline or integral check valves are
clean and working properly to prevent
backflow.
c)
Any isolating valves are fully open.
3. When satisfied with the mixed outlet tempera-
tures re-record the temperatures. If the
change in temperature of the mixed water is
extreme it is advisable to increase the
frequency of servicing, unless temperature
stability is achieved.
MAINTENANCE
10
The thermostatic cartridge seldom fails and the possibility of blocked filters should be investigated
before contemplating replacing it.
Although the Trevi Therm is supplied with strainers in the separate servicing valves, small particles of
debris may find their way past this and onto the filter screens in the thermostatic cartridge. These
should be cleaned and refitted. See section on cartridge replacement.
This shower valve has safety characteristics superior to the previous version of the Trevi Therm and is
approved to TMV3 standard, which allows it to be used in hospitals, nursing homes and residential
care home. When installed in such establishments it is a requirement that the following commis-
sioning and maintenance procedures be carried out. For normal domestic installations these checks
are not a requirement.
The following procedures should be carried out
after installation and every 6 months after to
ensure that the valve is functioning correctly.
Check that:
1. The application of the thermostatic valve
matches the approved designation.
2. The supply pressures are within the recom-
mended range for the application.
3. The supply temperatures are within the per-
mitted range for the application and comply
with the guidance for prevention of
Legionella.
4. The mixed temperature is as required for the
application.
Record:
5. Each hot and cold supply. (Make a note of
the measuring device used).
6. The mixed water temperature at the outlet
device.
Isolate:
7. The cold supply to the mixing valve and
record the mixed water temperature. The
temperature should not exceed the value
given in table (1) below.
COMMISSIONING & PERIODIC CHECKS
FREQUENCY OF REGULAR SERVICING
The purpose of servicing regularly is to monitor the performance of changes in system and valve set
up. This may require the need to adjust either the supply system or the valve. The A3000, A3700 or
E3115 should be checked and tested 6 to 8 weeks and again 12 to 15 weeks after commissioning.
The results are to be compared against original commissioning settings. If there is no significant
change (i.e. less than 1K) then a 6 monthly servicing cycle may be adopted. If the temperature
increases up to and greater than 2K at the mixed water outlet, then servicing checks should be car-
ried out more frequently, (every 4 months).
The following procedure is recommended for all servicing:
TABLE (1)
A guide to maximum temperature sets
Application
Mixed Water
Permitted maximum temperature rise
temperature
during site testing
Shower
41 °C
43 °C
trevi showers.qxd 04/12/03 13:21 Page 11