Construction

Automotive

Industry

120 VAC INPUT

FOUR ZONE SWITCHING RELAY

120 VAC CIRCULATORS

ZC

INPUT

120 VAC

6 AMP

6 AMP

PRIORITY

120 VAC

H H N H N H N H N H N H

ZONE4

See NOTE

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Operation: When any thermostat calls for heat, the appropriate circulator is energized

and the isolated end switch (X and X) will start the boiler.

Priority Operation: When zone 4 is switched to the priority setting and is actuated, all

other zones will stop operation until zone 4 is satised. When zone 4 is not switched to

priority, all zones will operate independently.

Priority Protection Operation: When the priority switch is set to ON, and if the

priority zone calls continuously for more than one hour, power is returned to all the

terminal N. Hot wire to terminal H.

Note: Resistor (1K Ω, 1/2W) may be needed between W and C terminals for power-

stealing thermostats. This does not apply to any REHAU thermostat.

Operation: When any thermostat calls for heat, the boiler is given a signal to start.

The appropriate circulator is energized only when the boiler temperature is above the

set low limit.

Priority Operation: When zone 4 is switched to the priority setting and is actuated, all

other zones will stop operation until zone 4 is satised. When zone 4 is not switched to

priority, all zones will operate independently.

Priority Protection Operation: When the priority switch is set to ON, and if the

have priority for up to one hour starting from when it calls next.

terminal ZC to ZC on the aquastat control. Connect terminal ZR to ZR on the aquastat

Power Input: Connect 120 volt ac power input to terminals N and H. Neutral wire to

terminal N. Hot wire to terminal H.

For updates to this publication, visit na.rehau.com/resourcecenter

The information contained herein is believed to be reliable, but no representations, guarantees or warranties of any kind are made as to its accuracy, suitability for particular applications or the results to be obtained therefrom. Before

using, the user will determine suitability of the information for user’s intended use and shall assume all risk and liability in connection therewith. © REHAU 2015

855.616 07.2015

Specications:

This device complies with part 15 of the FCC Rules. Operation is subject to the follow-

ing two conditions: (1) This device may not cause harmful interference, and (2) this

device must accept any interference received, including interference that may cause

undesired operation.

Features:

External Indicator Lights

Priority Protection

Simplied Wiring

Sealed Relays

Fuse Protected Outputs

100% Factory Tested

Isolated End Switch

Contractor Friendly PC Board Layout

Universal Thermostat Compatibility

UL Approved

24 volt Power Input or Output Terminal

Two Standard Pump Relay Controls Connected Together (SR502 – SR506)

Troubleshooting:

models and is readily available at electronic supply outlets. If the thermostat is battery

powered, then check that the batteries are fresh and installed correctly.

Problem: No heat in a zone or room of building

is good. When there is a call for heat, the yellow LED will come on indicating power to

the zone circulator. This indicates the thermostat is working correctly. If the red LED

does not come on, then check the thermostat and thermostat wiring for errors.