Honeywell Y8185 - Manual (Page 3)

Fig. 3—Leveling methods for wallplate or subbase.
5 WIRE WALLPLATE OR SUBBASE
Follow the Instructions provided by the heating or
heating/coollng equipment manufacturer. If not avail-
able, refer to TYPICAL WIRING DIAGRAMS at end of
this publication,
NOTE: Aii wiring must comply with local electrical
codes and ordinances.
FOR WALLPLATE (Heating-Only System)
□ Refer to Fig. 4 and strip thermostat wire insulation
as necessary.
Q Connect wires to R, W, and C terminals. Firmly
tighten screws. The timer is powered by the system’s
low voltage transformer. NOTE: An unmarked fourth
terminal is provided for 3-wire [series 20} primary
controls (Fig, 11).
n Push excess wire back into wall.
□ Plug hole in wall with nonhardening caulk, putty,
or nonflammable insulation to prevent drafts from affect­
ing thermostat operation.
FOR SUBBASE (Heating/Cooling Systems)
ED Refer to Fig. 4 and strip thermostat wire insulation
as necessary.
□ Connect the wires to corresponding terminals on
the subbase.
If labels do not agree with your new subbase—
—Refer to Table 2 or Figs. 12-15.
—Determine correct hookup from the listed control
function and the equipment control circuit.
The timer is powered by the system's low voltage
transformer. 24 Vac must be maintained across termi­
nals R and C.
TABLE 2—TERMINAL DESIGNATIONS
SUBBASE
TERMINAL CONTROL FUNCTION
R Control transformer power.
W Heating control circuit.
Y Cooling control circuit jumper to W
for heat pump compressor control}.
G Fan control circuit.
C Timer control (transformer common).
0 Changeover or reversing valve, made
continuously in cool.
B Changeover or reversing valve made
continuously In heat
□
□
Push excess wire back into wall.
Piug hole in wall with nonhardening caulk, putty,
or nonflammable insulation to prevent drafts from affect­
ing thermostat operation.