Instructions / Assembly

Installing Your Heater
FOR EXAMPLE: Your furnace is rated at 50000 Btu/hr. The water
heater is rated at 30,000 Btu/hr. The total is 80,000 Btu/hr. You
need two grilles, each with 20-square inches of free opening,
unless connected by horizontal ducts which would require each
grille or opening to have a free area of 40 square inches.
Openings for inlet or outlet air should not be made into attic area if
attic is equipped with a thermostat controlled power vent.
Thermostat Installation
Williams’ heaters are operated by a millivolt type thermostat.
Current to the thermostat is supplied by the pilot generator. Do not
connect to electricity. Anticipator settings are not required.
1. If an old thermostat is being replaced and is in a satisfactory
location and the wiring appears to be in good condition, use
existing wiring. If in doubt, use new wire.
2. If a new location is chosen or if this is a new installation,
thermostat cable must first be run to the location selected. All
wiring must agree with local codes and ordinances. These
instructions cover bringing the wire down from the attic but it
can be run from a basement or crawl space using similar
methods.
3. Before drilling a hole in the wall at the selected location, drive
a small finishing nail through the ceiling in the corner of the
wall and ceiling above the thermostat location. Pull the nail out
and push a small stiff wire through the hole so it can be found
in the attic. Drill a ½-inch hole through the ceiling wall plate.
4. Probe for obstructions in the partition. Then drill a ½-inch hole
through the wall at the selected location for thermostat.
5. From the attic, feed the thermostat cable or a stiff wire through
the wall until even with the thermostat location.
6. Snag the thermostat cable through the hole and pull the cable
through the hole in the wall so that 6 inches of the cable
protrudes.
7. Route the cable to the wall heater.
8. Never use nails or staples across the thermostat wires.
FIGURE 9 Grilles Connecting Rooms to
Make Unconfined space
FIGURE 8 Air from outdoors or crawl space
FIGURE 10 Air from Outdoors or Crawl
Space
FIGURE 11 Free Area
Btu/hr.
Btu/hr./Input