ITR POLAR HD, Installation And Operating Manual

Page: 67 / 80

Section 9, Installing the Distribution Module
International Thermal Research 9-5
Figure 9-4 Domestic Hot Water System Plumbing.
• The engine heat/pre-heat connections are located on the
side of the distribution module. Hot coolant from the engine
enters the module at the “engine heat inlet”. The “engine heat
outlet” returns the coolant back to the engine supply. When
the pre-heat function is installed an additional pump is
connected between the “engine heat outlet” and the engine
supply. The module contains a red and black wire to connect
this pump. The pre-heat switch on the remote control panel
will activate this pump. See Figure 9-5: Engine heat/pre-heat
system plumbing.
Figure 9-5 Engine Heat / Pre-heat System Plumbing.