ecocool 150R
Operating Manual
Page 16
www.grantinstruments.com
5.0 Operating procedures
5.1
Preparing the ecocool 150R for use
5.1.1 Liquid level
Remove the lid and fill the tank to an appropriate level with a liquid suitable for your
working temperature; see section 4.7 for liquid options.
Maximum fill level
190 mm (10 mm from the top of tank)
Minimum fill level
160 mm (40 mm from the top of the tank)
If silicon oil is used, adjust the maximum and minimum fill levels to allow for thermal
expansion and contraction of the liquid during operation to prevent overspill. Allow for
any liquid in external circulation paths. If using liquids that can evaporate, then periodic
checking and refilling should be completed. The fluid must cover the cooling coil to
maintain the cooling power and prevent condensation. Refit the lid when filling is
complete.
The low liquid level float switch will alarm if the liquid level drops below the level required
to safely cover the heater. The alarm will switch off the heater, cooler and stop
temperature control. This is a safety measure to prevent damage to the equipment, not
an indication that the liquid level has dropped below the minimum recommended level
given above.
5.1.2 Tank lid
Always keeps the lid fitted when operating the equipment.
Take care when lifting and removing the lid as it may be hot. Steam and hot
vapours can cause scalding.
5.1.3 Setting the over-temperature thermostat
An over-temperature cut-out dial with a temperature scale is located at the top right of the
heating circulator. The over-temperature probe independently monitors the bath
temperature and switches the heater off if it goes above the cut-out threshold.
Coarse setting of the over-temperature thermostat
Rotate the temperature cut-out dial in line with the marked scale to the desired setting.
This should be higher than the set temperature to avoid operating the cut-out before the
set temperature has been reached. If the alarm is triggered the sounder can be silenced
by pressing either the
F
or
S
button once. To continue to use the heating circulator, let
the bath liquid cool by at least 5°C, either naturally or by replacing the liquid, switch the
equipment off, wait 10 seconds and switch it on again to clear the alarm. To avoid
nuisance tripping the trip point needs to be set at least 5°C above the desired control
temperature.
Alternative setting of the over-temperature thermostat
Rotate the temperature cut-out dial to maximum (or at least a value above the level
required) and configure the set temperature to the cut-out level required. Leave the bath
to reach the set temperature and stabilise for at least 5 minutes. Turn the cut-out dial
slowly anticlockwise until an over-temperature fault is displayed on screen and the alarm
sounds continuously. This gives an over-temperature trip point at the set temperature.
The audible alarm can be cancelled by pressing either the
F
or
S
button once.
