Thermo Scientific Neslab Merlin M 75, Manual

Page: 77 / 107

Chapter 2
Merlin 2 - 7
Thermo Scientific
Circuit Protector
Pre-Start
Starting
Setpoint
Before starting the chiller, double check all electrical and plumbing
connections. Ensure the power cord is secured to the rear of the chiller.
Have extra recirculating fluid on hand. If the chiller will not start refer to
Chapter 5 Troubleshooting.
Place the circuit protector located on the rear of the chiller to the up
position, the controller flashes and the alarm momentarily sounds.
The chiller has automatic restart. If the chiller was shutdown as a
result of a power failure and power is restored, it will restart.

Press . The controller will do a self-test (the controller will quickly
sequence through its LEDs and momentarily sound the alarm) and then
display the recirculating fluid temperature. The refrigeration system
and the recirculation pump will then start. The RECIRCULATING
PRESSURE gauge will display the pump operating pressure. If the
pressure needs adjusting, refer to Chapter 4.
NOTE
If on start up the chiller's recirculating fluid is outside either
temperature limit, the chiller will operate but the appropriate indicator will
flash until the fluid is within the limit.

To display/change the setpoint press until illuminates. The display
will flash the current setpoint value. Use the arrow keys to change the
value. The range is -15°C to 35°C.
NOTE If the arrow keys are not pressed within 10 seconds the display
returns to the current reservoir temperature. The controller will not allow
you to enter a setpoint closer than 2°C of either temperature alarm setting
discussed on the next page. Trying to use a setpoint within 2°C causes the
appropriate indicator to flash and sounds the audible alarm twice.

Start Up/Shut Down
CAUTION