Grant Instruments LTC4 - Manual (Page 11)

LTC4 31115 V1
Operating Manual Page 10
www.grantinstruments.com
5.1.4 Using the control unit pump
The LTC4 allows liquid to be pumped around a closed external system (not open to the
atmosphere). It cannot be used for circulation through an external open tank. The pump
is fitted with a blanking plate as standard. Fit a pump connector plate as shown below.
Ensure o-rings are located in the grooves, use silicone grease to hold the o-rings in
place. Note: the blanking/connector plates have a locating hole (see A below) to assist
correct alignment onto the pump moulding. It is important to verify the hole is aligned with
the corresponding locating pin (see B below) on the pump moulding. Failure to do so will
result in a leaking connection. Retain the blanking plate for refitting when the pump is no
longer required.
Always use pump connectors and hoses that are suitable for the operating
temperature and liquid used. Check the pipe connections are secure.
Never disconnect any pipes or hoses while they contain very hot or very cold
liquids or while the LTC4 unit is pumping.
Never use silicone oil with silicone tubing.
Pumping heat transfer liquid around an external system can lead to hazards that are
outside the control of Grant Instruments. It is essential that the user conducts a risk
assessment of the entire equipment installation to ensure that correctly rated materials
have been used throughout and that the system can be used safely.
5.1.5 Using the switch over relay ouput
An internal relay provides switch over contacts that can be used to control external
equipment. The pin connections on the rear panel 3 pin circular connector are:
3
2 1
Normally Closed
Normally Open
Common
Rear
Panel
connector
Relay
B
A