Corps. Indirect - Fired Water Heater Installation, Operating and Service Instructions

17
Switching relay Wiring Diagrams (con’t)
Switching Relay SR-504 with Priority Option
L o w V oltage
120 V olts
FUSE 1 AMP
C OM / 24 V A C
FOUR Z ONE SWIT CHING REL A Y
WITH OPTIONAL PRIORIT Y
Z ONE 1
Z ONE 2 Z ONE 3 Z ONE 4
Z ONE 4
PRIORIT Y
ON
OFF
Z ONE 1 Z ONE 2 Z ONE 3 Z ONE 4 PO WER
120 V OL T CIR CUL A T ORS
X X
END SWIT CH
Z C ZR
INPUT
SR 504
Z ONE 1
Z ONE 2
Z ONE 3
Z ONE 4
PO WER
120 V OL T REL A Y
120 V A C INPUT
T T ON BOILER
W a t er H ea t er C ir cula t or
T emperature Differential
P ump/T T 24v
LED
flashing green = calling for heat
solid green = at temperature
red = error
20 °
15 °
10 °
5 °
160 °
150 °
140 °
130 °
120 °
1 10 °
P r ob e
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