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IEC E055-71520302 Programmable Fan Coil Thermostat
Front Panel
- Liquid Crystal Display with Thermoglow
- Up/Down Buttons
- Mode Button
- Fan/Override Button
- Heat or Cool Indicator
Display
- Mode Indicators
Selects the operational mode of the equipment.- HEAT – Indicates the heating mode.
- COOL – Indicates the cooling mode.
- AUTO – Indicates the system will automatically changeover between heat and cool modes as the temperature varies.
- PROGRAM ON – Indicates the time period program is enabled to run.
- OFF – Indicates heating and cooling are turned off.
- Clock with Day of the Week
Indicates the current time and day. This clock is
also used to program the time period schedules. - Room Temperature Display
Indicates current room temperature. - Desired Set Temperature
Indicates desired room temperature(s).
- Override icon
Indicates the program is currently being overridden for up to six hours. - Occupied & Unoccupied icons
Indicates the program number: Occupied 1,2,3 or Unoccupied. - Setup icon
Indicates the thermostat is in the advanced setup
mode. - Fan
icon
Indicates fan operation.- Fan
= low speed - Fan
= medium speed - Fan = high speed
When only the Fan icon is displayed, the fan is in the Auto mode and will run only when necessary to heat or cool.
- Fan
- Start & Stop icons
Appear when programming occupied time periods. - Locked icon
Indicates keypad has been locked. - Outside icon
Indicates the temperature displayed is from the optional outside sensor.
Set the Clock and Go
Press the MODE and FAN buttons at the same time for two seconds to enter Setup screens.
The thermostat is preprogrammed from the factory to operate a 4 pipe system without the need for further programming. To optimize the installation of this thermostat for a 2 pipe system, follow the instructions in the Advanced Setup section.
Selecting the Heat or Cool Mode
4-Pipe Operation
Select Mode by Pressing the MODE Button
- Heating Only
The HEAT setting indicates the temperature the room has to reach before the heating source will turn on to heat the room. - Cooling Only
The COOL setting indicates the temperature the room has to reach before the cooling source will turn on to cool the room. - Heating or Cooling
AUTO will automatically select heat or cool based on room temperature demand. - Time Schedule for Heating or Cooling
Program On will activate the stored timer operation for the heating and cooling setpoints (occupied or unoccupied periods). - Off
OFF indicates both heating and cooling are turned off.
2-Pipe Operation
Heat Only
Step #6 = 1 in the Advanced Setup section.
- Heating Only
The HEAT setting indicates the temperature the room has to reach before the heating source will turn on to heat the room. - Time Schedule for Heating or Cooling
Program On will activate the stored timer operation for the heating and cooling setpoints (occupied or unoccupied periods). - Off
OFF indicates both heating and cooling are turned off.
Cool Only
Step #6 = 2 in the Advanced Setup section.
- Cooling Only
The COOL setting indicates the temperature the room has to reach before the cooling source will turn on to cool the room. - Cooling Only
Time Schedule for Heating or Cooling Program On will activate the stored timer operation for the heating and cooling setpoints (occupied or unoccupied periods). - Off
OFF indicates both heating and cooling are turned off.
Heating and/or Cooling
Step #6 = 3 in Advanced Setup, and the accessory changeover sensor (G100-71520306) is used.
Step #6 = 4 or 5 in Advanced Setup. Operation is the same as a 4-pipe system.
- HEAT indicates the temperature the room has to reach before the heating source energizes. If the water supply is cold, this screen and heating would be locked out.
- COOL indicates the temperature the room has to reach before the cooling source energizes. If the water supply is hot, this screen and cooling would be locked out.
If step #6 = 3, this screen will not appear. - AUTO will automatically select heat or cool based on the room temperature demand.
If step #6 = 3, only heat or cool will appear. - Program On will activate the stored timer operation for the heating and cooling setpoints.
- OFF indicates both heating and cooling are turned off.
Note: If the water temperature is changed during the year, the thermostat will then automatically lock out the incorrect mode.
Basic Operation
Selecting Your Desired Temperature (adjusting the setpoints)
AUTO OR PROGRAM MODE
Pressing the UP or DOWN button in Auto or Program mode will adjust both the heat and cool set temperatures simultaneously.
Fan Operation
Note: If the thermostat is placed in the Off mode, the fan will de-energize.
Overriding the Daily Schedule
Pressing and holding the FAN button for 5 seconds may be used to interrupt the normal time schedule programming of the thermostat. The override feature may only be used when the thermostat is running the time schedule, in Program On mode.
- Unoccupied Operation – During programmed, unoccupied periods pressing and holding the FAN button for 5 seconds will temporarily force the thermostat into Occupied 1 comfort settings for one to six hours (step #13, page 21). The Override icon will be illuminated during this time. If you press and hold the FAN button while the thermostat is currently overriding the daily schedule, this will reset the timer, return the thermostat to the correct time period program for the day.
- Occupied Operation – Pressing and holding the FAN button for 5 seconds during a programmed Occupied time period will have no effect.
Programming
Occupied & Unoccupied Periods
Press the MODE button. While holding MODE, press the UP button for two seconds to enter time peri od programming.
The copy command becomes available after the maximum # of occupied periods are programmed in a day. This example uses 1 as the maximum occupied periods ever programmed in one day.
If no is selected, as in previous steps flashing prompts for input will appear for start and stop times for Occupied 1. If more than one occupied period was selected on page 13, then cool/heat setpoints, and start/stop times for additional occupied periods will be prompted.
PROGRAMMING NOTES
- You will be prompted to enter both heat and cool setpoints even if the thermostat is configured for heat only, or cool only.
- If only 1 Occupied period is selected, the Occupied 2 & 3 steps will be skipped. Further, if only 2 occupieds are selected, the Occupied 3 steps will be skipped.
- Heat & Cool setpoints for Occupied 1 are the same for each day. Heat & Cool setpoints for Occupied 2 & 3 can be adjusted differently for each day, if desired.
- If the start time is set for later than the stop time, the program will run from the start time to midnight and from midnight to the stop time on the same day. For example: 9:00pm start, 8:00am stop, on MTWTF. This program will run from 12:00am MTWTF to 8:00am MTWTF and again from 9:00pm MTWTF to 12:00pm MTWTF.
- The Unoccupied settings take effect at all times when: (1) the program is on and (2) the current time is outside a preset occupied period. For this reason start and stop times aren’t necessary for unoccupied.
- If the same start and stop times are programmed in for an occupied period, then it will run 24 hours.
- If only 1 Occupied period is selected, the Occupied 2 & 3 steps will be skipped. Further, if only 2 occupieds are selected, the Occupied 3 steps will be skipped. Programming Occupied & Unoccupied Periods
- When the time period programming for Unoccupied is in the Override mode (see page 12), the Heat & Cool setpoints for Occupied 1 are used.
Advanced Setup
Advanced Setup Table
| Step
# |
Description | Range | Factory
Default |
| 1 | Time of Day | 24 hour | 12:00 am |
| 2 | Day of the Week | Mo – Su | Mo |
| 3 | Display Blanking | On / Off | On |
| 4 | Single or Dual Setpoint | 1 / 2 | 2 |
| 5 | 2- or 4-Pipe System | 2 / 4 | 4 |
| 6 | 2-Pipe System Operation | 1 – 5 | 1 |
| 7 | Fan Auto Operation | On / Off | Off |
| 8 | Deadband/Temp. Swing 1st Stage | 1 – 6 | 2 |
| 9 | Minimum Heat/Cool Differential | 0 – 6 | 2 |
| 10 | Thermoglow Backlight | On / Off | Off |
| 11 | Fahrenheit or Celsius | F / C | F |
| 12 | Read Only Duct Sensor? | On / Off | Off |
| 13 | Override Timer Length | 0 – 6 hours | 2 hours |
| 14 | Dry Contact Polarity | NO / NC | NO |
| 15 | Dry Contact Operation | Occupied / Unoccupied | Occupied |
| 16 | Dry Contact Setpoints | Unoccupied / Off | Unoccupied |
About Advanced Features & Operation
- CALIBRATION – Under normal circumstances it will not be necessary to adjust the calibration of the temperature sensor. If calibration is required, please contact a trained HVAC technician to correctly perform the following procedure.
- CLOCK BACKUP – In the event of a power loss, the thermostat’s internal clock will continue to keep proper time for a minimum of 48 hours without external power or batteries.
- DEADBAND OPERATION – Contro ls one Heat and one Cool stage with a three speed fan (see below).
- The low-speed fan for heat or cool is turned on when: The temperature spread from the setpoint is equal to or greater than: the setpoint plus the 1st stage deadband (step #8, page 20). This 1st stage deadband is adjustable from 1-6 degrees and the default is two degrees.
- The medium speed fan for heat or cool is turned on when: The temperature spread from the setpoint is equal to or greater than: the setpoint plus the 1st stage deadband (step #8, page 20), plus the 2nd stage deadband. This 2nd stage deadband is fixed at one degree and is not adjustable.
- The high-speed fan for heat or cool is turned on when: The temperature spread from the setpoint is equal to or greater than: the setpoint plus the 1st stage deadband (step #8, page 20), plus the 2nd stage deadband, plus the 3rd stage deadband. This 3rd stage deadband is fixed at one degree and is not adjustable.
The above figure assumes the minimum on time for the prior stage has been met to allow the next stage to turn on, once the deadbands have been exceeded.
- DRY CONTACT SWITCH –
external device such as a Central Time Clock, Occupancy Sensor, or a Telephone activated device to force one or more thermostats into Occupied 1 or Unoccupied (steps #14 and 15, page 21-22).
This feature allows an When the CK1 and R terminals are shorted together, and the thermostat is programmed for Occupied operation (step #15, page 22) the thermostat will be forced into Occupied 1 setpoints and the Occupied 1 icon will blink.
Note: The thermostat must be in Program On mode for this feature to have any effect.
Important Note: For control of multiple thermostats by 1 source, refer to the enclosed yellow document P/N 88-175 ‘Potential Phasing Problems’ before installation.
- FACTORY DEFAULTS
If, for any reason, you desire toreturn all the stored settings back to the factory default settings, follow the instructions below.
WARNING: This will reset all Time Period and Advanced Programming to the default settings. Any information entered prior to this reset will be permanently lost.
- FAN OPERATION – Fan operation is available in four different modes:
- Fan: When only the fan icon is displayed, this indicates that the fan is in the Auto mode, will only energize during a heating or cooling cycle, and will modulate fan speeds based on temperature demand
Pressing the FAN button will cause the low, medium, or high speed fan icon to appear (see page 11), indicating that the fan will run continuously. The fan will de-energize if the thermostat is placed in the Off mode or an unoccupied time period (see page 26).
Notes:- If a Duct sensor is connected to this thermostat, then the fan should be programmed for continuous operation (step #7, page 20). This will provide airflow over the Duct sensor and provide more accurate temperature readings.
- If the fan is programmed for continuous operation (step #7, page 20), the low speed fan will run continuously when the fan is in the Auto mode and during occupied time periods, but will de-energize if the thermostat is placed in the Off mode.
- MINIMAL DISPLAY – When the thermostat is programmed for a minimal display (step #3, page 18), only the time of day will appear. When a button is pressed the full, normal display will appear for 10 seconds.
- ENERGY-SAVING SMART FAN –
This feature auto-matically de-energizes the fan during an Unoccupied time period, except when necessary to heat or cool (see page 28).
Note: The fan will not de-energize during an Unoccupied time period if it has been programmed for continuous operation (step #7, page 20). - HEAT/COOL DIFFERENTIAL – The Heat and Cool setpoints will not be allowed to come any closer to each other than the value set in Advanced Setup step #9, on page 20. This minimum difference is enforced during Auto-changeover and Program On operation.
Note: To increase the spread between the heating and cooling setpoints in the Auto-changeover mode press the MODE button until only the heat setpoint is displayed; adjust to the desired setpoint. Press the MODE button until only the cool setpoint is displayed; adjust to the desired setpoint. Press the MODE button again to enter the Auto-changeover mode where both the heat and cool setpoints are displayed. - KEYPAD LOCKOUT – To prevent unauthorized use of the thermostat, the front panel buttons may be disabled. To disable, or ‘lock’ the keypad, press and hold the MODE button. While holding the MODE button, press the UP and DOWN buttons together. The LOCKED icon will appear on the display, then release the buttons.
To unlock the keypad, press and hold the MODE button. While holding the MODE button, press the UP and DOWN buttons together. The LOCKED icon will disappear from the display, then release the buttons. - LOCKING COVER
- OUTSIDE SENSOR – To view an Outside Sensor (step #12, page 21), enter the Advanced Setup by pressing and holding the MODE button. While holding MODE, press the FAN button for 5 seconds to enter Setup screens. Advance to set up step #12 by repeatedly pressing the MODE button. If an optional outside sensor is connected, the outside temperature will appear in the clock display.
- DUCT SENSOR (P/N G100-71520307) – The thermostat is programmed from the factory to automatically recognize when a Duct
The sensor is connected The Duct Sensor measures indoor air temperature and sends this information to the thermostat; it measures temperature with a range of 32 to 99 F.
The Duct Sensor should be connected to the thermostat using a solid conductor CAT 5, CAT 5e, or CAT 6 type network communication cable. This is an unshielded cable with four twisted pairs of 24 gauge solid wire; DO NOT use stranded cable. The cable length should not exceed 250 feet. If less than 75 feet of cable is required to connect the thermostat to the Duct Sensor, a three-conductor thermostat cable (18-24 gauge) may be used; this cable is NOT suitable for any length greater than 75 feet.
IMPORTANT: Do no use shielded wire. Do not run sensor wiring in the same conduit as the 24VAC thermostat wiring. Electrical interference may cause the sensor to give incorrect temperature readings. See the Duct Sensor instructions for further details. - SINGLE SETPOINT BEHAVIOR – When configured for Single Setpoint operation (step #4, page 19), the degree icon will blink when the large number is displaying room temperature and will remain solid when displaying the heating or cooling setpoint. In the Auto and Program On modes the deadband is enforced both above and below the setpoint. To avoid short cycling, a deadband of at least two degrees is recommended (step #8, page 20). To display the room temperature press and hold the MODE button for two seconds. Release the MODE button to return to the normal display.
Warranty
INTERNATIONAL ENVIRONMENTAL CORPORATION – TERMS AND CONDITIONS
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REFERENCE:
Download Manual: IEC E055-71520302 Programmable Fan Coil Thermostat User Manual
https://device.report/energystar/2360105
IEC E055-71520302 Programmable Fan Coil Thermostat – Energy Star Certification
IEC E055-71520302 Programmable Fan Coil Thermostat User Manual