Warning: ... SR502/503 Switching Relay Controlling Another SR502/503 Switching Relay SR 503 24 VAC POWER ZONE 2 POWER ZONE 1 ZONE 3 ZONE 4 JUMPER Operation: When any thermostat calls for heat, the appropriate circu-lator is energized and the isolated end switch (X and X) will start the boiler. The circulator pumps are Grundfos UPS15-58FC. Combine the reliability of the Taco Zone Valves, Priority Zoning Circulators, Thermostats, and the “00” family of circulators with the ... and red indicating light is energized. I've updated the drawing to include the Geo Loop Pump for Zone 1. 1 amp fuse in switch relay is good. 3. When heat is not in use, I am seeing yellow light flashing on my taco valve system for both E gen thermostats zones, however, when the heat is turned on at the req temp, the yellow light becomes solid, then the red light comes on and heat seems to be working through radiators. My problem is with the two E gen thermostats. Priority Operation:When zone 4 is switched to the priority setting and is actuated, all other zones will stop operation until zone 4 is sat-isfied. The red light for zone one flashes. Zone 1 is connected to the Geothermal Loop Pump and Zone 2 is attached to the Hydronic Loop Pump. Whether you’re looking for switching relays, zone valve controls, priority zoning circulators, or fan controls, Taco has everything you need. Work with 2-, 3- or 4-Wire Zone Valves. I have a TACO SR502 2-zone controller and this person purchased a Honeywell L6006C 1018 aquastat controller. POWER LIGHT WILL ALWAYS BE OFF. is there a way to troubleshoot what may be the problem? TACO ZONE CONTROLS WIRING GUIDE Pages Switching Relays – Single Zone Wiring 2 – 12 ... SR502 2 Zone Switching Relay with Priority ... * T STAT LIGHT WILL GO ON AND OFF WITH 24 VAC SIGNAL. Someone else came out the other day to hook it up. Rub Rail Mounted LED Navigation Light Set 2-1/2’’ F38-6800D view now Rub Rail Mounted LED Navigation Light Set 4" F38-6810B-1 view now SuproFlex Mounted LED Navigation Light Set, 2-9/16" F38-9960 ... TACO Marine® is a brand of TACO Metals, LLC. I jumped the white and red wires at the tstat and still nothing. Thanks! We have 1 Taco SR502 manual available for free PDF download: Wiring Manual Taco SR502 Wiring Manual (104 pages) ZONE CONTROLS, Switching Relays/ with PowerPort Options and Expandable to 20 Zones, Zone Valve Controls/with PowerPort Options and Expandable to 20 Zones, Plug-In PowerPort Cards, Add-On Power Controls, Fan Controls The lights are red on both zones (actually, three for some reason, in addition to green main light, even though we only have two zones), even when zone 1 should not be heating. Hello! I have a Taco SR 502 2 zone switching relay. 3 Turn on the "fan" on the T8665A. Turn on the W8665E dip switch for zone 1. We’ve enhanced our complete line of Zone Valve Controls with the features and styling you’ve been asking for. Tstat is calling for heat but the red light never comes on at the 502. 24 VAC SIGNAL. The description says "with integral check valve". SR502 "TT" (left) connects to w8665e "W" (zone 1) SR502 "TT" (right) connects to w8665e "RZ" (any RZ works) Get your actual T8665A thermostat ready to go. 2. Any thoughts on what the issue is and how to fix it would be appreciated. We have a Taco SR506 switching relay where the green power indicator LED is on and the LED for zone 6 is on, however, the LEDs for zone 1 and 2 are not on as expected. The broken functionality is around calling the Recirc Pump and I believe this is reflected in the Zone 1 Light on the side of the Taco … When the zone valve is fully open, the red light goes on and energizes the end switch relay. The w8665E finds it and assigns it to zone 1.