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Owner's Manual
DESCRIPTION
The RC-122 is a precision digital thermostat designed for 24 VAC two-stage heating and cooling systems. It
offers programmability, stand-alone operation, and robust, optically isolated communications with automation
systems, utility control systems, and personal computers. The RC-122B is equipped with a "cool blue"
backlight display.
Electrical rating:
Maximum current:
Thermostat operating current:
The following requirements must be observed for installation in Europe: CE
1. This equipment must be installed in accordance with National wiring rules for the country in which it is
installed.
2. Fuses must be replaced only with IEC rated components.
3. All product labels, instructions and markings relating to safety must be translated to a language, which is
acceptable in the country in which this equipment is to be installed.
INSTALLATION
Before installing this thermostat:
1. Read all of the installation instructions carefully.
2. Read the Owner's Manual carefully.
3. Ensure that this product is suitable for your application.
4. Ensure that wiring complies with all codes and ordinances.
5. Disconnect power to the control transformer to prevent electrical shock and damage to equipment.
6. Select an appropriate location to ensure an accurate temperature reading.
Location
When replacing an existing thermostat, install the RC-122 in the same location. If the existing location doesn't
meet the following criteria, choose a new location. When choosing a location for the thermostat:
1. Ensure that the thermostat is mounted 5 feet above the floor and is at least 2 feet from an outdoor wall.
2. Ensure that the thermostat is located in an area where there is adequate air circulation.
3. Do not mount in the path of direct sunlight or of radiant heat generated by appliances.
4. Do not mount behind an outdoor wall, near a fireplace, or in the path of any air ducts.
RC-122 / RC-122B Two Stage Heat/Cool
2 Stage Heat / 2 Stage Cool
Thermostat Installation Instructions
24 V; 3 A; 50/60 Hz
2 A on any circuit, 3 A total
less than 15 mA
Document Number 13I00-17 / Rev B / April, 2004
Copyright
1999-2004 Home Automation, Inc.
©
All Rights Reserved
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Table of Contents
Related Manuals for HAI RC-122
Summary of Contents for HAI RC-122
- Page 1 Thermostat Installation Instructions DESCRIPTION The RC-122 is a precision digital thermostat designed for 24 VAC two-stage heating and cooling systems. It offers programmability, stand-alone operation, and robust, optically isolated communications with automation systems, utility control systems, and personal computers. The RC-122B is equipped with a “cool blue”...
- Page 2 4. Remove the existing plate or base from the wall. MOUNTING When mounting the RC-122, grasp the thermostat by the sides, avoiding the keys, and unsnap the base from the face. Holding the base to the wall so that the word "TOP" is upright and facing you: 1.
- Page 3 Connect each wire to the terminal strip on the thermostat base per the wiring diagram for your system application - See Figures 4 - 5. Form the thermostat wiring so that the cable lies flat between the terminal strip and the center of the base. If a remote system is being used with the thermostat, connect the remote system wiring to the supplied cable using the wire splices per the diagram for your remote system application - See Figures 7 - 8.
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Page 4: Typical Wiring Diagrams
TYPICAL WIRING DIAGRAMS CAUTION: Be sure to disconnect the power to the control transformer before removing or installing thermostat. Do not short gas valve(s), fan, heat relay(s), or cool relay(s)... even momentarily. This will blow a non- replaceable fuse. Do not attempt to hook up to live circuits. An accidental connection to a component on the thermostat circuit board could cause damage to the thermostat. - Page 5 Figure 5...
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Page 6: Disable Keys
CONFIGURING THE BACKLIGHT ON THE RC-122B The backlight on the RC-122B can be configured to one of three different modes: 1) on for 30 seconds when a key is pressed, 2) always on, or 3) always off. To configure the display backlight to turn on when a key is pressed, then back off 30 seconds later, set the “JP2”... -
Page 7: Installer Setup
INSTALLER SETUP This section describes the items that the installer must setup as part of the thermostat installation. The Installer Setup mode is used to configure the general operating parameters of the thermostat. When in Installer Setup mode: 1. The small digits on the top of the display are the item number. 2. - Page 8 24-hour time format non-programmable Fahrenheit 24-hour time format non-programmable When connected to an HAI controller, the thermostat should be configured as "non-programmable". To disable the clock and filter reminder displays, add “16” to each value. The default setting is 1.
- Page 9 Calibration offset This item is used to raise or lower the current temperature reading by 1 degree Fahrenheit or 1/2 degree Celsius. If this item is set to 30, no change will be made. Each digit below 30 will lower to temperature, and each digit above 30 will raise the temperature.
- Page 10 (1 = “- 29” to 59 = “+ 29” seconds per day; 30 = No change) The default setting is 30. Note: If an HAI automation system is being used, the controller system time is sent to the thermostat every minute. This adjustment will have no effect.
- Page 11 ANTICIPATION Anticipation is performed electronically and is independent of the type and load of the components in the heating and cooling equipment. This thermostat has electronic control based on proportional, integral and derivative components and maintains temperature to within 1 degree F of the setting. Anticipation is not adjustable.
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Page 12: Remote System Wiring Diagrams
Run a 3 (or 4) conductor wire from the HAI system to the thermostat location. All thermostats on an Omni, Omni II, OmniPro, or OmniPro II controller are connected to Zone 16 and Output 8. - Page 13 Note: Do not connect the red COMM cable wire to 12V. Figure 7 - Hookup to an HAI system Additional thermostats are connected in parallel. They may be connected in home-run or daisy chain configuration. REMOTE DAY/NIGHT SETBACK SWITCHES The thermostat can be connected to a remote system or remote switch. A signal can be sent from the remote location to change the thermostat temperature settings from the "DAY"...
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Page 14: Other Systems
* Red and yellow wires are not used. Insulate each using a small piece of tape. Figure 8 - Hookup to remote Day/Night setback switch OTHER SYSTEMS For connections to personal computers, utility management systems, and other automation systems, refer to connection diagrams provided with personal computer software package or other system. -
Page 15: Troubleshooting Tips
TROUBLESHOOTING TIPS SYMPTOM ACTION TO TAKE Thermostat Dead Check power to the thermostat Check wiring diagrams Check thermostat temperature sensor Thermostat will not operate with a damaged temperature sensor SYMPTOM ACTION TO TAKE Fan, Heat, Or Cool Check for break in G, W, or Y wire Inoperative Allow minimum off time to pass Check system options for correct settings... - Page 16 SYMPTOM ACTION TO TAKE Stage 2 On Too Often Stage 1 is not able to meet the load due to severe weather EEC is disabled SYMPTOM ACTION TO TAKE No Stage 2 Operation System may be equipped with an outdoor thermostat which is overriding Stage 2 the when outdoor temperature is mild Stage 1 is heating and cooling adequately...