®
Heat
Link
13
www.heatlinkgroup.com
TWH – Tankless Water Heater Panels
Installation, Operation, and Maintenance
Panel Wiring
Note: Terminal headers are removable to make wiring connections easier.
Thermostat Wiring
• 24V low voltage power may be supplied to the thermostat. Wiring of thermostat
should be done by qualifi ed electrician and should meet local codes and
jurisdictions. Wiring to the terminal strip requires 18 gauge 4 wire.
• Do not exceed 2VA per thermostat.
• Do not cross terminals
C
and
R
– this will damage the Power Box.
W R
C
AUX
24 V
Factory Jumper
Do not remove.
Signal
W R
C
AUX
Factory Jumper
Do not remove.
24 V
24 V
Signal
W R
C
AUX
Signal
24 V
24 V
Jumper to
Dry Contact
Factory Jumper
Do not remove.
2-Wire Thermostat
(battery only or non-electric)
3-Wire Thermostat
(HeatLink thermostats)
4-Wire Thermostat
(with dry contact signal)
Other Terminals
Auxiliary Contacts
The auxiliary contact set is dry, meaning no supply of power is present at the terminal. The
maximum allowable load is 2A. The auxiliary dry contact located on the terminal is to switch
another device (ie. the heat source) when there is a call for heat from any zone.
DHW Priority Contacts
The wiring harness of the optional Flow Switch for DHW Priority (FLWSWITCH) plugs into these
contacts (see page 15).
