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R842 Electronic Relay For Electric Baseboards

• Built-in transformer

• Universal replacement part

• Compatible with electronic T186 room sensor

Description

Viconics’ innovative R842 electronic relay has been

designed for silent control of high voltage resistive

heater loads (120V to 600 Vac) from a low voltage

control circuit. Typical applications include control of

electric baseboard and cabinet heaters in commercial

buildings. Inductive motor loads can also be controlled

(120 and 240 Vac models only).

Using advanced microprocessor-based circuitry, the

R842 is capable of handling greater than 500,000 cycles

(typical). It has a built-in transformer and is compatible

with most industry standard electromechanical or

electronic thermostats with on/off outputs. A unique

feature of product is that it can operate with a value

priced Viconics’ T186 electronic PI (proportional and

integral) room thermostat with setpoint capability,

providing exceptional accuracy, comfort, and energy

savings.

Fig.1 - R842 relay for electric baseboards

Features Benefits

• Unique compatibility with Viconics’ own designer

electronic thermostat

⇒ Permits fully electronic PI control

⇒ Improved accuracy (+/-0.3ºC) and comfort

⇒ Energy savings

⇒ Aesthetically pleasing thermostat

• Reliable microprocessor-based design ⇒ Long life

• Compatible with all standard 24 V thermostats ⇒ Adds flexibility

• Constant 10 second time delay

⇒ Not affected by ambient temperatures typically

found in older, thermal type baseboard relays

• Built-in transformer

⇒ Less inventory to stock

⇒ Easier installation

• Broad voltage ranges available: 120, 208, 240,

277, 347, 600 Vac.

⇒ Covers most voltage applications

• Status LED

⇒ Confirms operation

⇒ Simplifies troubleshooting

• Silent operation ⇒ Will not disturb occupants

• Direct replacement of competitive models ⇒ Easy to retrofit

• Large resistive amperage load rating ⇒ Will handle the largest baseboards with ease

• Inductive ratings ⇒ Used to control motor loads (fans, pumps, etc)

• Compact enclosure ⇒ Fits inside baseboard

• Standard ½” male conduit bushing ⇒ Can be installed on most electrical junction boxes

• 2 year warranty ⇒ Assured dependability

Summary of content (6 pages)

PAGE 1
R842 Electronic Relay For Electric Baseboards • Built-in transformer • Universal replacement part • Compatible with electronic T186 room sensor Description Viconics’ innovative R842 electronic relay has been designed for silent control of high voltage resistive heater loads (120V to 600 Vac) from a low voltage control circuit. Typical applications include control of electric baseboard and cabinet heaters in commercial buildings. Inductive motor loads can also be controlled (120 and 240 Vac models only).
PAGE 2
Description (Cont’d) T186 Sensor Models The R842 has several advantages over traditional electromechanical baseboard relays. The latter use the principle of thermal expansion to make or break the high voltage circuit. This operation typically takes 45 seconds and adds inaccuracy to the temperature control loop. The R842, with enhanced electronic circuitry, substantially reduces this long time delay and is not affected by ambient temperature conditions. Model No.
PAGE 3
Installation Important: All wiring must conform to local and national electrical code regulations. Please read these instructions carefully before the installation. Failure to follow the instructions could damage the product or cause a hazardous condition. Installation must only be performed by a qualified service technician. Disconnect power supply before installing in order to prevent electrical shock. There are two basic methods to install the R842 baseboard relay. B.
PAGE 4
Typical applications & wiring Two wire low voltage thermostat using R842 baseboard relay internal transformer Baseboard(s) / load(s) Relay(s) Thermostat(s) Transformer One One One Internal Two wire low voltage thermostat using a separate 24 Vac transformer Baseboard(s) / load(s) Relay(s) Thermostat(s) Transformer One One One External 2 wire low voltage thermostat 2 wire low voltage thermostat Internal circuit RED 1 RED 2 BLUE 1 1 1 2 BLUE 1 1 Set both switch on relay to factory default ON
PAGE 5
Multiple two wire low voltage thermostats using the same separate 24 Vac transformer to control multiple R842 baseboard relays Baseboard(s) / load(s) Relay(s) Thermostat(s) Transformer Viconics T186 sensor to control one R842 baseboard relay Baseboard(s) / load(s) Relay(s) T186 thermostat Multiple Multiple Multiple External One One One 2 wire low voltage thermostats L1 L2 / N Internal circuit RED 3 ON 1 T186 sensor 2 wire non polarized L1 2 BLACK 2 BLUE 1 L2 / N Separate remote 24 Vac transf
PAGE 6
Specifications Physical Specifications: Ambient Operating Temperature and Humidity Limits • -20°C to 65°C (-4°F to 149°F ) • 0 % to 95 % R.H. non-condensing Ambient Storage Temperature and Humidity Limits • -40°C to 80°C ( -40°F to 176°F ) • 0 % to 95 % R.H. non-condensing Life cycles • Greater than 500,000 (typical, resistive loads) • 100,000 (typical, inductive loads for models R842-120, R842-208 and R842-240 only) Internal R842 transformer rating • 24 Vac, -15%, +10% 50/60 Hz; • 2.