Robertshaw 300-204 Operating Instructions

accurate control and display of the room temperature. In addition, it will also display all relevent information pertaining to your system. The clearly marked buttons and informative display make it extremely easy to understand and simple to use. Please take a few moments to read the brief instructions and familiarize yourself with the various functions in order to obtain maximum benefit from this truly unique electronic control. GENERAL INFORMATION The thermostat normally displays room temperature, and whether heating is currently on. The two buttons on the front of the unit allow complete control of the equipment. Raising or lowering the setpoints in heating is as simple as push- ing a button. In addition, you may choose to display the tempera- ture in °F or °C. ENERGY STAR COMPLIANT Energy Star labeled products use less energy than other prod- ucts, save you money on utility bills and help protect the environ- ment. Energy Star setpoints are now standard on all thermostats to ensure maximum efficiency and comfort. Non-Programmable Heating 70°F (21°C)/Setback Heating 62°F (17°C) THERMOSTAT OPERATION MODE The 300-204 thermostat is a heat-only control and is permanently in the heat mode. HEATING  Controls the heating system only. Select the temperature you want while in the heating mode by pressing the ✟or ✞buttons. (The word HEAT and the temperature setting is displayed for 5 seconds.) CELSIUS / FAHRENHEIT Simultaneously press ✟and ✞to switch between Celsius (C) and Fahrenheit (F) temperature display. TEMPERATURE ACCURACY Full temperature accuracy will only be realized after the thermo- stat has been installed and powered for at least one (1) hour. POWER FAILURES Your thermostat employs the latest in solid state electronic technology. One of the unique features of your thermostat is that there is no battery required to maintain your selected setpoints in the event of a power loss as the memory is unaffected by power failures of any duration. When power is restored, the thermostat will continue operating as if the power had never been off. LIMITED OVERRIDE When the keyboard is locked (switch #2 locked), the user may override the temperature setpoint for 1 hour by pressing either the ✞or ✟button. The range of temperature override is ± 3 ºF or ºC. INSTALLATION INSTRUCTIONS LOCATION To ensure proper operation, the thermostat should be mounted on an inside wall in a frequently occupied area of the building. In addition, its position must be at least 18" (46cm) from any outside wall, and approximately 5' (1.5m) above the floor in a location with freely circulating air of an average temperature. You should avoid the following locations: – behind doors or in corners where freely circulating air is unavailable; – where direct sunlight or radiant heat from appliances might affect control operation; – on an outside wall; – adjacent to, or in line with, conditioned air discharge grilles, stairwells, or outside doors; – where its operation may be affected by steam or water pipes or warm air stacks in an adjacent partition space, or by an area behind the thermostat which is not climate controlled; – where its operation will be affected by the supply air of an adja- cent climate control HVAC device; and – near sources of electrical interference such as arcing relay contacts REMOVING THE THERMOSTAT FROM THE SUBBASE 1. Insert a flat blade screwdriver or a coin 1/8" into the slot locat- ed in the bottom center of the thermostat case and twist 1/4 turn. When you feel or hear a “click,” grasp the case from the bottom two corners and separate from the subbase. Some models require more force than others when separating due to the number of terminals on the subbase. 2. Swing the thermostat out from the bottom. 3. Lift the thermostat up and off the subbase. 4. Place the rectangular opening in the subbase over the equip- ment control wires protruding from the wall and, using the sub- base as a template, mark the location of the two mounting holes (exact vertical mounting is necessary only for appear- ance). 5. Use the supplied anchors and screws for mounting on drywall or plaster; drill two 3/16" (5mm) diameter holes at the marked locations; use a hammer to tap the nylon anchors in flush to the wall surface and fasten subbase using the supplied screws. (Do not overtighten!) CAUTION THIS DEVICE SHOULD BE INSTALLED BY A QUALIFIED TECHNICIAN WITH DUE REGARD FOR SAFETY, AS IMPROPER INSTALLATION COULD RESULT IN A HAZARDOUS CONDITION Operating Instructions Digital Heating Thermostat Model 300-204 111-133

6. Connect the wires from your system to the thermostat termi- nals. Carefully dress the wires so that any excess is pushed back into the wall cavity or junction box. Ensure that the wires are flush to the plastic subbase. The access hole should be sealed or stuffed to prevent drafts from the wall affecting the thermostat. REPLACING THE THERMOSTAT ON SUBBASE 1. Position the thermostat on the hinged tabs at the top of the subbase. 2. Gently swing the thermostat down and press on the bottom center until it snaps into place. THERMOSTAT COVER LOCK You may lock the cover down to prevent unauthorized access to the thermostat by adding the clear plastic lock (included in the instal- lation bag.) Insert the plastic lock piece into the bottom of the mounted base. The ends of the lock piece fit snugly under the lock pins extending from the bot- tom of the mounted base. The tab in the middle of the lock piece extends down from the base. To release the locking mechanism, press the lock piece up and into the base while gently prying open. THERMISTOR MOUNTING INSTRUCTIONS Outside rear view with backplate closed WIRING DIAGRAM TERMINAL AND SWITCH DESIGNATIONS RH .............24 VAC from transformer equipment W ...............Energizes on a call for heat DIP SWITCH OPTIONS Located on the back of the thermostat, once the subbase is removed. Switch #1 – Allows for a 4-minute or 2-minute minimum on/off time. Switch #2 – Allows for the keypad to be locked or unlocked. SPECIFICATIONS Rated Voltage 20-30 VAC, 24 nominal Rated Current 0.08 Amps to 1.5 Amps continuous per output with surges to 4 Amps max. Control Heating: 38° to 88°F in 1° Steps Range 5° to 30°C in 1° Steps Thermostat Measurement Range 28° to 124°F or 0° to 48°C O.D.T. Displayed Range -50° to 119°F or -48° to 47°C Control Accuracy ±0.5°C at 20°C, ±1°F at 68°F 300-204 W RH 4 min. (on/off) 2 min. (on/off) Unlocked Locked 1 2 RH 24 VAC Transformer Line Voltage W1 W