Honeywell Y8185 User Manual
Honeywell
180850/06828,C, 18185/06828,C,L, Y8185, Y8024,
NEW CONSTRUCTION THERMOSTATS AND SUBBASES—
HEATING AND HEATING/COOLING
INSTALLATION INSTRUCTIONS
1 PREPARATION^
D Check thermostat and subbase (it used) suitability
for the heating or heating/cooling system. Refer to
Tablet.
□ Assemble tools required: flat blade screwdriver,
hand or power drill with 3/16 in. drill bit, wire cutter/
stripper or sharp knife, bubbie level or plumb bob and
line.
LZ] If subbase or wallplate is mounted on a vertical
outlet box, order the optional 193121A Cover Plate
TYPE OF HEATING SYSTEM TO BE CONTROLLED
Electric (line voltage)—typical baseboard and radiant
Electric Furnace—forced air • Compatible, Ensure correct subbase identity selected
Gas—Direct Spark Ignition (DSl), Intermittent Pilot (IP),
and Standing Pilot (SP)
Heat Pump • Compatible, Ensure correct subbase identity selected
Hot Water Zone
Oil
Vent Damper • Honeywell damper motors are compatible,
Warm Air Zone
Hf thermostat is not compatible with the system being controlled, the system will not operate. No hazard exists. The
thermostat will not be damaged unless it is used to directly control a line voitage system, A Honeywell R841 or
R8239D1015 Isolating Relay must be added to the thermostat control circuit for proper system operation,
^Consult manufacturer for installation requirements.
----------------------------------
Assembly (inoludes cover plate, adapter ring,
screws).
□
Ensure power is off to the heating or heating/
cooling system at the main fuse panei. Most buildings
have a separate switch box or circuit breaker for dis
connecting power to the heating and cooling (if appli
cable) equipment.
THIS THERMOSTAT is compatible with virtually all heat
ing or heating/cooling systems. See Table 1 for addi
tional thermostat compatibility information.
TABLE 1—THERMOSTAT AND SYSTEM COMPATIBILITY
• The R8239D1015 Isolating Relay or R841 Silent
Switching Center must be installed in the thermostat
control circuit.^
for fan control.
• Compatibia Ensure that the 24 V control transformer
common is accessible for connection to thermostat
cable conductor and power to transformer is not reg
ularly interrupted by high temperature or limit
operation.
for fan control and changeover control (0 terminal for
cool and B terminal for heat),
• If system with first stage heat pump and gas or oil
second stage heat, use conventional recovery
models.
• If system with first stage.heat pump and electric
second stage heat, use ramp recovery model.
• Honeywell 2-wire valves are compatible.
• Some non-Honeywell 2-wire valves will require a'
R8239D1015 Isolating Relay In the thermostat control
circuit.^
• Some 3-wire valves will require an R8239A1052 Iso
lating Relay in the thermostat control circuib^.b
• Ensure that the 24 V control transformer common is
accessible for connection to thermostat cable con
ductor and power to transformer is not regularly
interrupted by high temperature, purge cycle, or limit
operation.
• If the control transformer common is not accessible,
a separate transformer and TRADELINE wallplate or
subbase with two C-C clock terminals will be
required.
• Some non-Honeyweli damper motors will require an
RS239D1015 Isolating Relay in the thermostat control
circuit.3 Check control amperage requirement.
• Most are compatible.
and
CONDiTIONS/COMPATIBILITY
C.H.
Rev, 7-88*
Form Number 69-0258—2
®Honeywell inc. 1988
2 LOCATE NEW THERMOSTAT
Locate thermostat about 5 ft. [1.5 m] above the floor in
an area with good air circulation at average temper
ature. Do not mount the thermostat where it may be
affected by—
—drafts, or dead spots behind doors and in corners,
—hot or cold air from ducts.
—radiant heat from the sun or appliances.
—concealed pipes and chimneys.
—unheated (uncooied) areas behind the thermostat,
such as an outside wall.
----------------
3 UNPACK THERMOSTAT
NOTE: Illustrations show thermostat models that have
conventional recovery from heating setback (except
when noted}.
□
Handle new thermostat carefully; rough handling
may interfere with its accuracy. Before unpacking, refer
may
to Fig. 1.
to Fi
□
Remove and discard shipping wrap. IMPORTANT;
Save package of screws, instructions, and spare pro
gram pins and ramp recovery segments (T8185R only)
for homeowner.
□ Remove thermostat cover by lifting from bottom.
Set aside cover until called for iater.
□ Carefully remove material protecting mercury
switch bulb (a).
□ Loosen 2 captive mounting screws and separate
wallplate (if provided} from back of thermostat base.
□
Run wires from heafing or heating/cooling equip
ment to new thermostat location.
This control requires an additional conductor to
the control transformer common; i.e., typical
2-wire heating system requires 3 wires be pulfed,
4-wire heating/cooling requires 5 wires.
IMPORTANT-
LIFT COVER
Fig. 1—Unpack thermostat.
4 MOUNT WALLPLATE OR SUBBASE-
rH Hold wallplate or subbase in position on wall as
shown in Fig. 2.
EH Mark holes for anchors on the wall. Use spirit level
to make sure the wallplate or subbase will be level.
□ Drill 3/16 in. holes and gently tap anchors into
holes until flush with the wall.
E H
Pull wires through large wiring hole in subbase.
Fig. 2—Mounting wallplate or subbase to wall.
E H
Loosely fasten the wallplate or subbase to the wall
with the 3 screws.
EH
Carefully level the wallplate or subbase (Fig. 3)
and firmly tighten screws.
E H
For mounting on horizontai or vertical outlet box,
see instructions packed with optional Cover Plate
Assembly, Part No. 193121A.
2
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 available, 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
G
□
Push excess wire back into wall.
Heating control circuit.
Y Cooling control circuit jumper to W
for heat pump compressor control}.
Fan control circuit.
Timer control (transformer common).
C
0 Changeover or reversing valve, made
continuously in cool.
Changeover or reversing valve made
B
continuously In heat
□
Piug hole in wall with nonhardening caulk, putty,
or nonflammable insulation to prevent drafts from affect
ing thermostat operation.
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