Eppendorf Galaxy CO2 Sensor - Manual (Page 66)

Equipment options
Galaxy
® 170 R/170 S CO
2
Incubators
English (EN)
66
12.1.1 Troubleshooting the cooling system
The thermo-electric module which governs the cooling system is self-contained and does not require any
specific maintenance during the life of the incubator. If, however, the cooling system fails to perform
according to expectation, perform the following steps:
1. Check that the incubator has been set to the desired cooling mode. For the cooling system to operate,
either COOL or AMBIENT mode must be selected.
2. Check that the circulation fans are operating. If either fan (internal or external fan) is not rotating when
COOL or AMBIENT mode is engaged, and there are no obvious obstructions, contact your authorized
service engineer for assistance.
3. If the temperature inside the chamber drops below 5 °C while the cooling system is operating, frost may
form on the heat sink fins, reducing airflow and adversely affecting performance. Raise the temperature
in the chamber to no less than 5 °C to avoid loss of performance.
4. Check that the rear fan inlet and outlets are not blocked and that there is sufficient clearance of 50 mm
(2 in) between the rear of the incubator and the nearest possible obstruction.
12.2 BMS relay contact alarm
The BMS (Building Management System) Relay Contact Alarm allows a signal from a central alarm system
to be switched ON or OFF to indicate an alarm condition at the incubator.
The following alarm conditions will activate the system: over-temperature, under-temperature, system
failure, CO
2
high and CO
2
low.
As an integral option, the alarm can be programmed to indicate when the power fails (perhaps due to an
electrical fault) or is switched off. If the power failure warning is active, the relay contacts will be reversed
(pin 4, which is normally open, becomes normally closed and pin 6, which is normally closed, becomes
normally open). The alarm will also respond to other types of alarms, depending on the options installed on
the incubator.
The system is connected at the rear of the incubator via a standard 6-pin DIN socket (see Fig. 12-1 on p. 67)
for location. The matching plug is provided, when the option is installed.