VWR VWRC0386A, Instruction Manual

Page: 19 / 94

These chest freezers have remote alarm contacts and analog output. See
Figures 2-3 and 2-4 for the location of the remote alarm contacts. The
remote alarm connector is located in the parts bag provided with the
manual. It must be installed if connecting the freezer to an alarm system.
After installing the wiring from the alarm system to the connector, install
the connector to the freezer microboard and secure with the two screws
provided. The remote alarm provides a NO (normally open) output, a NC
(normally closed) output and COM (common). The contacts will trip on a
power outage, high temperature alarm or low temperature alarm. They
will also trip on high stage, control probe and micro board failures. Figure
2-12 shows the remote contacts in alarm state.
The analog output function allows the freezer to output signals
representing the temperature of the freezer cabinet. The factory default
setting is 4-20 mA. Refer to Table 2-2 for output specifications.
2-10 Chest Freezer VWR International
Section 2
Overview
Remote Alarm Contacts
and Analog Output
Figure 2-12. Remote Alarm Contacts
4-20 mA 0-1V 0-5V
Temperature -100 to +50°C -100 to +50°C -100 to +50°C
Table 2-2. Analog Output Specifications
IIM MPPO OR RTTA AN NTT U US SEER R IIN NFFO OR RM MA ATTIIO ON N
CAUTION! Stored product should be protected
by a redundant 24 hour/day monitoring system
with alarm capability. An interconnect jack and
thermocouple are installed for centralized
monitoring, should on-board system fail.