Models 3
346/348, 3
377/379, 4
408/410
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the inlet of the heater.
2. Locate the two wires labeled “power supply to
thermostat” and “power return from the thermostat”
within the heater’s electrical junction box.
3. Remove the wire nuts from these two wires. Keep the
wire nuts.
4. Remove the strain relief at the top of the junction box.
5. Run the thermostat cord through the strain relief along
with the other wires that feed into the junction box. You
will need a pliers to squeeze the strain relief and wire
bundle together to allow installation of the strain relief
back into the junction box.
6. Connect the black thermostat cord lead to the lead
labeled “power supply to thermostat”. Twist a wire nut
onto the exposed lead conductors until tight. Pull the
wire nut to make sure it is secure.
7. Connect the white lead of the thermostat cord to the
lead labeled “power return from thermostat”. Twist a
wire nut onto the exposed lead conductors until tight.
Pull the wire nut to make sure it is secure.
8. Attach the terminal on the end of ground wire to the
ground screw located within the junction box.
Remote Thermostat
Installation
Instructions
August 1999
2.9-1
1
Strain
Relief
Black LLead
White LLead
Ground
Screw
