Switching relay Wiring Diagrams (con’t)
Switching Relay SR-504 with Priority Option
Low Voltage
120 Volts
® | ® |
20°160°
150°
15°140°
10° 
130° 120°
5°110°
Differential 
Temperature
LED
flashing green = calling for heat
solid green = at temperature
Pump/TT red = error | 24v |
Probe |
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| ZONE 4 |
SR 504 |
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| ZONE 1 | ZONE 2 | ZONE 3 | ZONE 4 |
| PRIORITY |
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| ON | |||||
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| OFF |
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| FOUR ZONE SWITCHING RELAY |
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| WITH OPTIONAL PRIORITY |
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120 VOLT RELAY |
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COM / 24 VAC |
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| ZONE 1 | ZONE 2 | ZONE 3 | ZONE 4 | POWER |
X | X |
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ZC | ZR |
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END SWITCH |
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| 120 VOLT CIRCULATORS | INPUT | ||
FUSE 1 AMP |
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TT ON BOILER |
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| Water Heater Circulator |
| 120 VAC INPUT | ||
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POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
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