HMY110/HMY220
400-619-000-E 4/20/07 1/4
The HMY110/HMY220 thermostats are designed to control the
temperature of a floor heating system. The thermostats can be used
with a maximum load of 15 A (1800 W @ 120 VAC or 3600 W @ 240
VAC).
SUPPLIED PARTS
•
One (1) thermostat
•
One (1) floor temperature sensor
•
Four (4) 6-32 mounting screws
•
Four (4) solderless connectors
TURN OFF POWER TO THE HEATING SYSTEM AT THE MAIN
POWER PANEL TO AVOID ELECTRICAL SHOCK. This
thermostat does NOT protect against electrical shocks resulting
from contact with both conductor wires.
The thermostat’s housing is not watertight. Do NOT install the
thermostat in an area where it can be exposed to water or rain.
Connect the thermostat
wires to the power and to
the load using solderless
connectors for copper
wires.
Connect the grounding
braid of the floor heating
system to the supply
ground.
NOTE
: All cables and connections
must conform to the local electrical
code. This thermostat has tinned cop-
per wires for line and load connec-
tions. Special CO/ALR solderless
connectors must be used if these
wires are to be connected to alumin-
ium conductors.
Mount the thermostat onto the
electrical box using the provided
screws.
Connect the temperature sensor
to the terminals as shown.
NOTE
: The temperature sensor
wires must not come in contact
with the electrical wires and
must be routed outside the elec-
trical box.
WARNING
: THE FLOOR TEMPERATURE LIMIT
MUST
BE SET TO
'LIMITED' FOR ALL LAMINATE AND ENGINEERED WOOD FLOOR
APPLICATIONS (SEE SECTION 5.2).
If there is a sticker on the display, peel it off by pulling the tab marked
with an arrow.
Apply power to heating system.
3.1 Clock and Day Setting
The clock must be set when the time display flashes on the screen.
n
Press and hold the
Day
button for 1 second. The
day display will flash.
o
Set the day using the
buttons.
p
Press the
Mode
button. The hour display will flash.
q
Set the hours using the
buttons.
r
Press the
Mode
button again. The minute display
will flash.
s
Set the minutes using the
buttons.
t
Press the
button to end.
3.2 Customizing the Schedule
You can customize your thermostat's schedule using either:
•
5+2 day programming
- easier to set as you enter only two pro-
grams: one program for weekdays (Monday to Friday) and
another program for weekends (Saturday and Sunday).
•
7-day programming
- more flexible as you can set a different
program for each day of the week.
See section 5.1 to learn how to switch between the two different pro-
gramming methods.
You can program up to 4 periods in a day. To program a period, you
must enter the starting time and the temperature setpoint for the
period.
5+2 day programming
5-day programming allows you to enter one program for weekdays
(Monday to Friday) and another program for weekends (Saturday
and Sunday). Use the following grid to record your new settings.
n
Description
1.
o
Installation
2.
Floor
Sensor
Floor Temp
Adjustment buttons
Day selection
button
Program button
Mode button
Return button
Temperature limit
selection switch
Display
GFCI test and
reset buttons
Temperature sensor
terminals
Power
supply
Load
p
Programming
3.
Floor
Sensor
Floor Temp
sensor
wires
HMY110/HMY220
User Guide
Electronic Thermostats
400-619-000-E (Nuheat) ENG.fm Page 1 Friday, April 20, 2007 1:32 PM
