Tekmar D 508, Data Brochure, Page: 5 / 12

5 of 12 © 2010 D 508 - 05/10
STEP FOUR
ROUGH IN WIRING
• 18 AWG or similar wire is recommended for all 24 V (ac) wiring.
• All wires are to be stripped to 1/4” (6 mm) to ensure proper connection to the control.
• Run wires from the 24 V (ac) power to the thermostat. Use a clean power source to
• If an auxiliary sensor is used, install the sensor according to the appropriate Data
Brochure and run two wires from the sensor to the thermostat.
• Run wires from the heating device to the thermostat.
STEP FIVE
WIRING THE THERMOSTAT
(Refer to the examples on the following page.)
24 V (ac) Power
Connect the 24 V (ac) power to the R and C terminals of the thermostat. This connection
provides power to the microprocessor and display of the thermostat.
Auxiliary Sensor
Either an indoor, slab, or outdoor sensor may be connected to the auxiliary sensor input.
Connect the two wires from the auxiliary sensor to the Sensor terminals.
Heat Relay (Rh – W)
The Heat Relay Rh – W terminals are an isolated output. There is no power available
on these terminals from the thermostat. These terminals are to be used as a switch for
a 24 V (ac) circuit. This circuit can operate a low current 24 V (ac) device directly or an
external relay to enable a line voltage or high current device.
STEP SIX
INSTALLING THE FRONT COVER
Align the hinges on the bottom of the front cover with the bottom of the thermostat mounting
base. Pivot the front cover around the bottom hinges and push the top against the mounting
base until it snaps firmly in place.
Pivot front
cover around
bottom hinges
Align hinges
on bottom
of front cover
1
2
Menu
Item
NOTE: If the 508 is to be used for remote sensing (i.e. The built-in air sensor is disabled
and an indoor sensor is being used.) Mount the thermostat in the desired location in an
appropriate manner.