Robertshaw 300-203 Owner's Manual download pdf

DESCRIPTION OF ICONS

Display icons vary according to the model. Your thermostat may

not display all of the icons shown.

DIP SWITCH OPTIONS AND FUNCTIONS

Positioning the DIP switches in either the ON or OFF position

enables you to choose between two different options. The DIP

switches are located on the interior of your thermostat and may

be accessed by following the procedure for removing the thermo-

stat from the subbase. The following list describes your DIP

switch options.

DIP Switch No. DIP Switch OFF DIP Switch ON

1 4 minute minimum ON 2 minute minimum ON

2 Keypad unlock Keypad lock

3 Fan immediate with heat call Fan on with plenum

switch

4 Single stage Multi-stage

5 LED #1+No icon LED #1+

% Filter icon

6 LED #2+No icon LED #2+

$ Fault icon

1. 2 Minute or 4 Minute ON Times This option allows you to run the

equipment for either a 2 or 4 minute minimum off and on time.

2. Keypad Lock

In the ON position locks out all buttons except the

OUTDOOR temperature button.

3. Plenum Fan Switch In the OFF position, the fan comes on imme-

diately with a call for heat. In the ON position, the fan is controlled

by the equipment (plenum switch control).

4. Single or Multi-stage This option allows you to select up to two

(20 stages of heating and cooling.

5. LED #1 + Indication In the OFF position LED #1 will light when the

terminal is energized. In the ON position LED#1 will light and a

Filter

icon will be displayed on the LCD when the terminal is

energized.

6. LED #2 + Indication In the OFF position LED #2 will light when the

terminal is energized. In the ON position LED#2 will light and a

Fault

icon will be displayed on the LCD when the terminal is

energized.

SPECIFICATIONS

Rated Voltage 20-30 VAC, 24 nominal

Rated A.C. 0.050 Amps to 0.75 Amps continuous

Current per output with surges to 3 Amps Max.

Rated D.C. 0 Amps to 0.75 Amps continuous

Current per output with surges to 3 Amps Max.

Control Heating: 38° to 88°F in 1° Steps

Range 5° to 30°C in 1° Steps

Cooling: 60° to 108°F in 1° Steps

16° to 40°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

Minimum (between heating and cooling)

Deadband 2°F or 1°C

NOTE: This thermostat contains electronic circuitry replacing the

conventional mechanical anticipator.

One (1) Y

ear Limited Warranty

The manufacturer warrants to the original purchaser that its

product and component parts will be free from defects in

workmanship and materials for a period of one (1) year from

the

date of purchase. Return to the original point of purchase for

replacement of your product.

Warranty Limitations

This warranty begins at date of purchase.

Warranty is Void if:

The date code is defaced or removed.

The product has a defect or damage due to product alteration,

connection to an improper electrical supply, shipping and han-

dling, accident, fire, flood, lightning, or other conditions beyond

the control of the manufacturer.

The product is not installed according to the manufacturer’s

instructions and specifications.

The product has been installed near sources of electromagnet-

ic interference (EMI) such as arcing relay contact.

Owner’s Responsibility

Provide proof of purchase.

Provide normal care and maintenance.

Pay for freight, labor and travel.

Pay for service calls related to product installation.

Return any defective product.

In no event shall the manufacturer be liable for incidental or

consequential damages.

This warranty gives you specific legal rights and you may have

others which vary by state and/or province. For example, some

states and/or provinces do not allow the exclusion or limitation

of incidental or consequential damages so this exclusion may

not apply to you.

The manufacturer’s continuing commitment to quality products

may require a change in specifications without notice.

This equipment, if installed in strict accordance with the manu-

facturer’s instructions, complies with the limits for a Class B

computing device pursuant to Subpart J of Part 15 of FCC rules.

NEW & IMPROVED FEATURES

Your new electronic thermostat has been made even better by the

introduction of several new and improved features. Building on its

reputation for efficient and dependable operation, your thermostat

now offers the following list of enhancements.

Thermostat and Sensor Calibration

Release 3 provides easy calibration of the thermostat and remote

sensors. Simply press and hold the FAN button for 10 seconds

and adjust with the  or  buttons.

Push Button Auto Repeat

Programming is easier with the push button auto repeat feature.

GENERAL INFORMATION

The thermostat normally displays room temperature, mode of

operation and whether cooling or heating is currently on. The

six buttons on the front of the unit allow complete control of

your equipment.

You may select different heating and cooling setpoints for the

system to maintain, e.g., 70° in heating and 75° in cooling.

Raising or lowering the setpoints in heating or cooling is as sim-

ple as pushing a button. In addition, you may choose to display

the temperature in °F or °C.

The thermostat also allows you to select continuous fan operation

(useful when using an air cleaner) or have the fan come on with

the equipment.

BUTTON FUNCTIONS

Outdoor Press to display the outdoor temperature (optional)

Mode Press to select cool only, heat only, auto (cool &

heat) or off

Fan Press for continuous fan or auto fan

Day/Night Press to alternate between day and night

temperature setpoints

USER CONTROLS

MODE

Select the desired mode of operation by repeated pressing of the

MODE button:



– Indicates cooling system only (the word COOL is

displayed for 5 seconds)



– Indicates heating system only (the word HEAT is

displayed for 5 seconds)



– Indicates both the heating & cooling systems

(the word AUTO is displayed for 5 seconds)



– Blinking indicates cool ON



– Flickering indicates heat ON

OFF – Disables controller so equipment will not operate

(fan operation is still possible in this mode)

COOLING:



Select the temperature you want your equipment to maintain while

in the COOLING mode by pressing and holding the  or  but-

tons. The control setpoint temperature is displayed for 5 seconds.

HEATING:



Select the temperature you want your equipment to maintain

while in the HEATING mode by pressing and holding the  or 

buttons. The control setpoint temperature is displayed. Your new

electronic digital thermostat has been designed to provide accu-

rate control and display of room temperature. It will also display

all relevant information of the system.

FAN: 

The fan will come on automatically when the system is operating,

but there is no indication of this on the display. To select continu-

ous fan operation, press the FAN button and the display will

show



. This is recommended for electronic air cleaners and

continuous ventilation requirements.

TEMPORARY TEMPERATURE OVERRIDE WITH

KEYPAD LOCKED

(The keypad may be locked to prevent tampering by selecting the

ON position of DIP switch #2.)

If the keypad is locked to prevent tampering you may still tem-

porarily adjust the setpoint by ± 3° F or ± 3° C of the pro-

grammed day setpoint. Press the  or  button to raise or lower

the setpoint for a 1-hour period.

OFF MODE

To turn off the heating or cooling system, press the MODE button

until the word OFF appears on the LCD. It will remain displayed

until the mode is changed. The OFF mode prevents the system

from being energized.

Avoid using the OFF mode during extremely cold weather to pre-

vent damage to the equipment from freezing.

AUTO CHANGEOVER MODE 

You may set the thermostat to automatically switch from HEAT-

ING to COOLING mode by pressing the MODE button until the

word AUTO and both the heating



and cooling



icons appear

on the LCD. The thermostat will energize the heating or cooling

system based on the temperatures established for both modes.

Operating Instructions

Multi-Stage 2 Heat/2 Cool

Non-Programmable Thermostat

Model 300-203

111-112B

1 2

Summary of Contents

Page 1 - Operating Instructions

DESCRIPTION OF ICONSDisplay icons vary according to the model. Your thermostat may not display all of the icons shown.DIP SWITCH OPTIONS AND FUNCTIONS

Page 2 - (for Release 3)

USER CONTROLS (CONT)OUTDOOR (ODT) BUTTONIf your thermostat has been installed with an electronic outdoorremote sensor (Uni-Line Part #529), you may vi

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Robertshaw 300-203 Owner's Manual

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Summary of Contents

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