ERV-24-HC11 With FanCycler® Technician Settings Cat. P048013 Rev. 2.1 12.04 Pipersville, PA 18947 USA Phone: 215-766 1487 - Fax: 215-766 1493 Email: support@scillc.com - www.scillc.
Please read this manual carefully before installation and use.
1. Introduction Advanced Ventilation Features of the ERV-24-HC11 thermostat with FanCycler® Protected by one or more of the following patents: US 5,547,017; 5,881,806; 6,431,268; CA 2,245,135 ® The ERV-24-HC11 thermostat with FanCycler has enhanced features to compliment controlled mechanical ventilation systems. These features were configured for use by your installing technician. (For more information please refer to the technician manual or visit www.scillc.com and www.fancycler.com).
2. Options and Accessories Remote sensor option: • RS01: for remote temperature sensing (1 required); for averaging temperature at 4 locations (4 required) – the thermostat will control on the average temperature of all 4 locations • RS02: for averaging temperature at 2 locations (2 required) – the thermostat will control on the average temperature of both locations For details on where to purchase accessories, please contact SCI for your nearest location or visit our web site at www.scillc.com 3.
Make electrical connections as shown on enclosed electrical wiring diagram. (Next page) Verify that you have 24 VAC between terminals C and Rh/Rc. C ool H eat A u to F an O n /O ff S e le c t P ro g Install the cover to the back panel; first the two tabs on the bottom and then the top tongue. Push until tight against the wall. Wait for 15 seconds for the LCD display to appear (completion of power circuit charging and for self-diagnostics). S e ttin g 4.
The Rc/Rh terminals are bridged at the factory for a one transformer application. In the case of a two transformer application, you must remove the bridge and connect the individual transformers to Rc (cool) and Rh (heat). FD – Fresh-Air Damper connection - 24Vac/1Amp. The damper type must be Power Open, Spring Close. 5. DIP Switch and Jumpers Configuration 5.1 The DIP switch is located in the middle of the board as shown in the drawing.
Table 5.1 – DIP switch selection FUNCTION 1 Internal temp. sensor Remote temp. sensor 1 Electric Oil/Gas 1 3 min. compressor delay No compressor delay 1 Programmable Non-Programmable 1 ON OFF x x x x x x DIP Switch settings 2 3 4 5 x x x OFF x x x ON x OFF x x x ON x x x x OFF x 2 x x ON x OFF x x x ON x x x 6 ON OFF x x x x x x x = Disregard 1 = Factory Defaults 2 = FOR TEST ONLY 5.2 DIP Switch Operation • The DIP switch has 6 pins. • Each pin can be ON (top) or OFF (bottom).
5.4 Jumpers explanation Jumper 1: Complete Reset of the unit. For complete reset: • Move JMP1 to position B. • Wait 15 seconds. • Return JMP1 to position A. JMP1 Default from factory: AB Jumper 2: NOT IN USE. JMP2 Default from factory: Leave it closed! Jumper 10: Enable or disable Auto change-over capability • • Enable Auto change-over – JMP10 in position A (default from factory). Disable Auto change-over – JMP10 in position B.
6. Remote temperature sensor connections – (optional) Important! The remote temperature sensor must be SCI type. Table 6.1 - N.TC. Sensor: Temperature ~ Resistance Characteristics Temp °C Temp °F Res. k 7.2 45 115.8 10.0 50 100.9 12.8 55 88.1 15.6 60 77.1 18.3 65 67.7 21.1 70 59.6 23.9 75 52.5 26.7 80 46.4 29.4 85 41.2 32.2 90 36.6 The default from factory is INTERNAL SENSOR. 6.1 Remote temperature sensor switch configuration 1. Move DIP switches 1,5 and 6 as in the picture. (See Table 5.
6.1.2 Remote sensor wiring configurations 1. Connection of one remote sensor (RS01) THERMOSTAT 2.
7. Advanced Setup ® The ERV-24-HC11 thermostat with FanCycler has enhanced features to compliment controlled mechanical ventilation systems and combination space and domestic hot water heating systems. Follow the steps below to set the unit’s advanced features: 7.1 Enter the Advanced Setup screens of the thermostat a. Press and hold (4 seconds) the On/Off button to turn the thermostat OFF. b. Using the “+” and “-“ buttons, move the temperature o set-point to 50 F. c.
8. Fan Cycling Configuration The purpose of fan cycling is to assure that the central air handler fan will run enough to distribute ventilation air and evenly mix air throughout the house, even when there is no demand for heating or cooling. Rather than operate the fan continuously or by a simple timer that doesn’t consider prior operation, the FanCycler method saves energy and wear and tear on equipment by only operating the fan if it hasn’t already operated enough.
8.1 Set the fan cycling ON time and OFF time. a. b. Press and hold the Select button until “LI” or ”UnLI” or ”CALC” appears on display. Using the “+” and “-“ buttons select between: • “LI” – Fan cycling limited - default. If “LI” is selected – no need to set “Fd” (Fan duty cycle) and “Ft” (Total period). • “UnLI” – Fan cycling unlimited ON time. Fan will be energized continuously after no fan activity for the fan OFF time. • “CALC” – Fan cycling calculated.
c. Press the Select button again – four digits will appear on display. d. Using the “+” and “-“ buttons adjust the fan cycling limited ON time. The number represents the number of minutes the fan will be energized after no fan activity for the fan OFF time. A value of 0 disables this option. Range 0-480 minutes - Default 10 minutes. e. f. Press the Select button again – “FF” will appear on display. Using the “+” and “-“ buttons adjust the fan cycling limited OFF time.
8.2 Set the fan duty cycle percentage and the total period. a. Select “Calc” in 8.1.b b. Press the Select button once - “Fd” will appear on display. c. Using the “+” and “-“ buttons adjust the fan duty cycle. The Number is the percent of time fan will be energized during each total period (will be set later – “Ft”). 0 disables this option. Range 0-100% (0-100P) – Default 33% (33P). d. Press the Select button - “Ft” will appear on display. e. Using the “+” and “-“ buttons adjust the total period.
9. Ventilation Damper Cycling The purpose of cycling the ventilation damper is to limit the possibility of over-ventilating, which could cause unnecessary space conditioning energy to be used. The damper will open when the fan comes on, but if the fan stays on longer than needed for the introduction of ventilation air, the damper will automatically close; it will then re-cycle for as long as the fan continues to operate. The damper OPEN and CLOSED times are set in Steps 9.1 (“dO”) and 9.2 (“dC”).
9.2 Set the damper cycling CLOSE time (“dC”). a. b. Press the Select button until “dC” appears on display. Using the “+” and “-“ buttons adjust the damper cycling CLOSE time. The number is the minutes the ventilation damper will be closed after the damper had been open and the fan is still operating for any reason. Range 1-480 minutes – Default 20 minutes. 10.
11. Fan cycling at night in heating mode status (“Fn”) Depending on the duct system design and the occupants, it may be desirable to not allow fan cycling at night during the heating season. If this option is turned OFF fan cycling will be disabled between the hours of 9 pm and 8 am while the thermostat system mode is HEAT. a. Press the Select button until “Fn” appears on display. b. Using the “+” and “-“ buttons adjust the fan cycling at night in heating mode status – select ON or OFF.
12. Pump cycling for combination space and domestic hot water heating systems (“FE”) As building enclosures become more energy efficient and heating loads are small, a single hot water heater can often supply hot water for both domestic use and space heating. This type of heating system is especially popular in multi-family housing. For such systems, this option can be turned ON to avoid potential microbial buildup in the space heating plumbing loop during periods of inactivity.
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To clear the average values follow these steps: 1. Press and hold (6 seconds) the On/Off button to set the system mode to OFF 2. Using the “+” and “-“ buttons set the temperature set-point to 90°F. When the display stops flashing, press and hold (8 seconds) the Select button until “Unlo” disappears from the display. 14. Lock the Thermostat’s Buttons Lock the thermostat’s buttons to prevent any unwanted changes made by any unauthorized person.
15. Offset Settings The Offset is used for field calibration of the measured temperature if necessary. • Press and hold (6 seconds) the On/Off button to turn the thermostat OFF. • Using the “+” and “-“ buttons set the temperature set-point to 60°F, and wait until the display stops flashing. • Press and hold the Select button (10 sec.) until “OFFS” and the Offset number (a number between –6…+6) will appear (not flashing) on the display.
16. Troubleshooting for Technician Problem The display is blank Cool does not switch on Heat does not switch on In heat mode, unit blows cool air The unit displays low temperature (32°F) all the time The unit displays high temperature (92°F) all the time The display shows the word "PROGRAM" without the name of the program period (wake, sleep, etc) Solution Check the thermostat for 24 VAC, remove the front cover and test between Rc/Rh to C.
SCI - Systems Controls & Instruments can offer a WIDE range of products for the HVAC industry, Such as: • Flush Mount Thermostats - Programmable and Non-Programmable. • HVAC Analyzer that can measure BTU’s, for technicians. • Tamper proof thermostats that can be operated ONLY from the remote control, for public places. • Thermostat with phone communication; listen to your thermostat from ANYWHERE and change settings.
