Commissioning - Mira FORM Installation & User Manual

Commissioning must be carried out in accordance with these instructions, and
must be conducted by designated, qualified and competent personnel.
Exercising the Thermostat
Thermostatic mixing valves with wax thermostats are inclined to lose their
responsiveness if not used. Valves which have been in storage, installed but not
commissioned, or simply not used for some time should be exercised before setting
the maximum temperature or carrying out any tests.
A simple way to provide this exercise is:
(a) make sure that the hot and cold water are available at the valve inlets, and the
outlet is open.
(b) move the temperature control rapidly from cold to hot and hot back to cold
several times, pausing at each extreme.
Maximum Temperature
The maximum blend temperature obtainable by the user should be limited, to prevent
accidental selection of a temperature that is too hot.
All Mira Thermostatic mixing valves are fully performance tested and the maximum
temperature is preset to approximately 43
factory.
Site conditions and personal preference may dictate that the maximum temperature
has to be reset following installation.
This shower control is provided with an adjustable temperature control knob, which
allows the user to select the blend temperature between ambient cold up to a preset
maximum.
Maximum Temperature Setting
Check that an adequate supply of hot water is available at the hot inlet of the shower
control.
During resetting, the hot supply to the shower must be as close to the typical maximum
to offset the possibility of any blend shift due to fluctuating supply temperatures.
However, the minimum temperature of the hot water must be at least 12°C above the
desired blend for correct thermostatic operation.
Temperatures should always be recorded using a thermometer with proven accuracy.
Check that both inlet isolating valves are fully open. Turn the temperature knob to
maximum and operate the flow control. Allow the temperature to stabilize and check
the outlet temperature.
- If the outlet temperature is set correctly then refer to Commissioning Checks.
- If adjustment of the temperature is required, carry out the following procedure:

COMMISSIONING

C under ideal installation conditions at the
o
22