wallas Nautic 40D, Operator'S Manual With Installation Manual

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WALLAS 40D
Operator’s Manual and Installation Guide
11
Using an external thermostat on Nautic 40D furnace with #3004 control panel
An external thermostat can
be
connected to the #3004 control panel cable as shown in Figure
13. (Connector pin 7
=
grey wire). Because the current is small the wire thickness is not
significant.
Any thermostat with closing contacts is suitable; the contacts should close when the thermostat
asks for more heat. When installing, please note the thermostat manufacturer’s instructions.
The thermostat will not switch the furnace on or off, but will adjust the furnace between minimum
power and the user determined power setting (made with the power knob). See Figure 16.
The desired temperature is set on the thermostat, and the furnace power setting is set to the
user’s requirement (determined by environment
I
outside temperature). Turning the power knob
to zero will defeat the thermostat function, higher power knob settings will make the thermostatic
control more aggressive, lower settings more moderate.
Figure 13:
Thermostat connections to 3004