Honeywell PC8900A Manual page 6

CAUTION
Disconnect power supply before wiring to prevent
electrical shock or equipment damage.
Mounting the W8900A-C Remote Module
Locate the W8900A-C in the equipment room near the HVAC
equipment. See Fig. 8.
CAUTION
Do not mount the W8900A-C inside any HVAC
equipment. Mounting the W8900A-C inside HVAC
equipment can cause damage to the W8900A-C.
1. Grasp the top edge of the W8900A-C cover, either at
the center or both corners, and pull it off from the base.
2. Locate the four mounting holes. See Fig. 9.
3. Position the W8900A-C on wall or cold air return. Level
the W8900A-C for appearance only; the device will
function properly even when not level. Use a pencil to
mark the mounting holes on the wall.
FURNACE OR BOILER
Fig. 8. W8900A-C location example.
4. Remove the W8900A-C from the wall, and drill 3/16 in.
holes in the wall (if drywall) as marked. For firmer
material such as plaster or wood, drill 7/32 in. holes.
Gently tap anchors (provided) into drilled holes until
flush with the wall.
5. Reposition the W8900A-C over the holes. Loosely insert
the four mounting screws (included) into the holes.
68-0173—3
W8900
WATER HEATER
M4459
6
WALL
MOUNTING
HOLES (4)
Fig. 9. Mounting W8900A-C Remote Module.
Wiring the W8900A-C to the HVAC Equipment
CAUTION
Disconnect power supply before connecting
wiring to prevent electrical shock or equipment
damage.
Wiring must comply with applicable codes, ordinances, and
regulations.
IN REPLACEMENT INSTALLATION:
1. Locate the terminal wiring strip on the old thermostat.
2. Note the wire color for each wiring terminal used.
3. Remove the wires connected to the old thermostat and
other controls. Tape off unused wires.
4. Use Table 2 or 3 to identify the W8900A-C terminal
labels. Connect the same loads that were connected to
the old thermostat to the W8900A-C Remote Module
with a new bundle of 18-gauge color-coded thermostat
wire; see Fig. 10. See Fig. 11 through 20 for wiring
diagrams for specific equipment applications.
W8900
MOUNTING
SCREWS (4)
M4463