Robertshaw 300-204 User Manual
Your new Robertshaw thermostat has been designed to provide
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 pushing a button. In addition, you may choose to display the temperature in °F or °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 thermostat 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 ± 3º F or
± 3º C.
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 subbase as a template, mark the location of the two mounting
holes (exact vertical mounting is necessary only for appearance).
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
111-133B
INSTALLATION INSTRUCTIONS (CONT)
6. Connect the wires from your system to the thermostat terminals. 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 installation 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 bottom 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
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