Comfort Stat CP1717, Owner'S Manual, Page: 3 / 8

When batteries are installed in the thermostat, the Span is reset back to setting 2.
Backlighting
Your thermostat has an electroluminescent lamp that backlights the display for easy viewing in the dark.
When any key is pressed, the display is illuminated.
The display will remain illuminated for 7 seconds after the last key is pressed. This allows the light to stay on if you need to operate several keys.
Note : If the thermostat is in Low Battery warning condition, the backlight will not operate. Replace with 2 new AA alkaline batteries to restore the
Backlight function.
Low Battery Warning
Your thermostat has a two­stage lower battery warning system. When the batteries are first detected to be weak, the first stage low
battery warning is indicated by battery symbol flashing on the LCD display. At your earliest convenience, you need to replace the
batteries with 2 new AA alkaline batteries. When the batteries become too week for normal operation, the thermostat enters the second
stage low battery warning which shuts down the thermostat. In this condition, battery symbol flashes alone on the display, and the
thermostat will turn your system off. Your system will remain shut­off until the batteries are replaced.
Note : The thermostat will still keep the current Set Temperature and Filter run time in memory until new batteries are installed. After confirming that new batteries have
been inserted, the thermostat will return to normal operating .
Error Mode
If the thermostat is unable to control your system due to an unexpected battery problem, the thermostat will enter Error Mode. In this condition, the thermostat flashes
“E1”or “E2” on the LCD display, and shuts off your system.
To correct this problem, replace the batteries with 2 new AA alkaline batteries, even if you have recently replaced them. Next, Move
the battery out hold any key then place the battery again. You will need to reprogram your thermostat and confirm normal operation .
If Error Mode returns, please call us for further information.
Auto Cut Off
Your thermostat will automatically cutoff in Heat mode if the room temperature rises above 95˚F (35˚C). It will cutoff in Cool mode if
the room temperature drops below 45˚F (7˚C).
Note that if your system has malfunctioned and no longer responds to thermostat controls, the Auto Cut­Off will have no effect.
Mechanical Heat Backup
This thermostat includes a bimetal switch that will automatically turn on the Heat when the temperature reaches about 41˚F (5˚C).WARNING: This switch only activates
the Heating terminal (W). The system itself must be capable of automatically turning the Fan On. Without normal Fan operation, severe damage to the heating system
could result.
INSTALLATION
What You Need
This thermostat includes two #8 slotted screws and two wall anchors for mounting. To install your thermostat, you should have the following tools and materials.
Ÿ Slotted Screwdriver(s)
Ÿ Small Philips screwdriver
Ÿ Hammer
Ÿ Electric drill and 3/16” bit
Ÿ Two 1.5V (AA) size alkaline batteries (included)
Remove Old Thermostat
CAUTION: Do not remove any wiring from existing thermostat before reading the instructions carefully. Wires must be labeled prior to removal.
INPORTANT! Turn off the power to the furnace at the main power panel or at the furnace.
Remove existing thermostat cover and thermostat. Some thermostats will have screws or other locking devices that must first be removed. Once the wall mounting
plate is exposed, look for wires. If wires are not visible, they may be connected to the back of the wallplate. Again, look for screws, tabs, etc. Some models have doors
that open to expose wires and mounting screws. See Figure 1.
Typical Home Thermostats
Wall mounting Plate Thermostat Cover