Taco SR501-EXP-4 Instruction Sheet

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Taco SR501-EXP-4 Instruction Sheet Manual pdf 1 page image

POWERZONE 1LEDINDICATORSFUSE6 AMPFUSE6 AMPSR 501-EXP-4POWERCONTROLSSLAVEPRIORITY ONRESETPRIMARY PUMP ONPOST PURGE ONPRIORITY PROTECT ONPUMP EXERCISE ON30 SEC/2 WKMASTEROFFOFFOFFOFFOFFNORMAL4 MIN/24 HOURACCESSORYPORT120 VACINPUTCIRCULATORHN/O N H120 VACCIRCULATORPRIMARYOUTPUTN/CINPUT120 VACPRIMARYCIRCULATOR(OPTIONAL)TO: "TT" on Boiler AquastatENDSWITCHRESETOVERRIDETHERMOSTATEXPANSIONX WRX 1A 2CBTO: DHW Aquastat if PC700Boiler Reset is installed.(See Page 2.)T24 VOLTS AC ONLYCSINGLE ZONEEXPANDABLE SWITCHING RELAYTHERMOSTATSee NOTENOTE: Resistor (1KΩ, 1⁄2 W)may be needed betweenW and C terminals.Operation: When the thermostat calls for heat, the circulating pumpis energized and the isolated end switch (X and X) will start the boiler.Priority Operation: When the priority dip switch is set to ON and thezone is actuated, all other connected zoning panels will stop operationuntil the zone is satisfied. When the priority dip switch is set to OFFand the zone is actuated, all other connected zoning panels will oper-ate independently.Mode Operation: When the mode dip switch is set to NORMAL, the endswitch relay will be energized if any zone is in operation. When the modedip switch is set to RESET, the end switch relay will only be energizedthrough the operation of a plug-in reset control or closure of Priority Input.Primary Pump Operation: When the dip switch is set to OFF, the pri-mary circulating pump output will not energize when zone calls forheat. When the dip switch is set to ON, the primary circulating pumpoutput will energize when zone calls for heat.Post Purge Operation: When the dip switch is set to ON, the circula-tion pump output will stay energized for 2 minutes after its thermostator aquastat is satisfied, but not operate the boiler.Priority Protection Operation: When the dip switch is set to ON andthe zone (priority) on master zone panel calls for heat continuously formore than one hour, then power is returned to the space heating zonesallowing all the zones to function independently. Once the zone (pri-ority) on master zone panel is satisfied, the control’s auto-reset is acti-vated and the zone is again allowed to have priority for up to one hour.Pump Exercise Operation: When the dip switch is set to ON, the solidstate timer cycles all the circulating pumps that are attached to theExpandable Switching Relay at the selected time interval. The timeinterval can be set for the pumps to run for either 30 seconds every 2weeks or for 4 minutes every 24 hours.End Switch: The switch closes when the thermostat calls for heat andthe mode switch is set to NORMAL. The end switch also closes whenthe mode switch is set to RESET and a PC Series boiler reset power con-trol is calling for heat.Expansion Connections: Set the expansion switch to MASTER on theswitching relay that has the designated priority zone or is utilizing thePC Series plug-in option. Set all other daisy chained controls to SLAVE.Using thermostat wire (18-22 gauge) connect between terminals A, B,C on the master control to the corresponding A, B, C on the SLAVEcontrol(s). Controls may be daisy chained up to 20 zoning panels usingany combination of -EXP controls (120 zones if all are 6 zone panels).Thermostat Input (24 vac):R Hot side of transformer. Connect to R on thermostat.W Switched R signal from thermostat. Connect to W on thermostat.C Common side of transformer. Connect to COM onthermostat (optional).120 VAC Connections (N is Neutral, H is Hot):Power Input Connect 120 Volt AC power.Primary Primary Pump (optional)N/O Zone Circulator ZoneN/C Zone Normally closed terminal for the Circulator Zone.Will deactivate on a thermostat call.N Connect to pump neutral leads.WARNING: Wiring connections must be made in accordance with all applicableelectrical codes. Use copper wire only. 120 VAC wiring must have a minimumtemperature rating of 75°C. Failure to follow this instruction can result in person-al injury or death and/or property damage. 12-18 gauge wire recommended for120 VAC connections, 14-22 gauge wire for thermostat connections, and 14-22gauge wire for 24 VAC source connections.Wiring Diagram:Instruction SheetSR501-EXP-4 Switching Relay102-385SUPERSEDES: March 1, 2013 EFFECTIVE: December 20, 2013Plant ID# 9300-2872SLAVEZONE PRIORITY ONRESETPRIMARY PUMP FUNCTION ONPOST PURGE ONPRIORITY PROTECTION ONPUMP EXERCISE ON30 SEC/2 WKMASTEROFFNORMALOFFOFFOFFOFF4 MIN/24 HOURDip Switch Settings:Specifications:PRODUCT NUMBER INPUT MAXIMUM TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTHSR501-EXP-4 1 120/60/1 VAC 12 amps 47/8" 65/8" 23/8"All circulator relay connections, including ZC/ZR, are rated 1/3 hp (6 FLA, 36 LRA) at 120 VAC.The end switch connection is rated 24 VAC, 1 amp.The thermostat connection supplies a 24 VAC class 2 output.This device complies with part 15 of the FCC Rules. Operation is subject to the fol-lowing two conditions: (1) This device may not cause harmful interference, and (2)this device must accept any interference received, including interference that maycause undesired operation.Troubleshooting:• Problem: Digital thermostats do not work correctly when connectedto a switching relay.• Solution: Some thermostats are a “Power Stealing” type which meansthey are powered by the switching relay with just 2 wires (R & W). Aresistor may be needed in order to have the thermostat work properly.This resistor should be placed between the W & C (common) termi-nals of the switching relay. If the thermostat manufacturer does notsupply a resistor, a 1000 ohm ½ watt resistor has proven to work withmost models and is readily available at electronic supply outlets (e.g.8the batteries are fresh and installed correctly.• Problem: No heat in a zone or room of building.• Solution: LED diagnostic lights will help find a component that isnot working properly. The green LED should always be on, indicatingthat power is connected and the solid-state fuse is good. When thereis a call for heat, the red LED will come on indicating power to thezone circulator. This indicates the thermostat is working correctly. Ifthe red LED does not come on, then check the thermostat and ther-mostat wiring for errors.For information on Taco’s Switching Relays (SR)including catalog sheet, instruction sheets, Visiostencils and our highly praised Zone ControlsWiring Guide, scan the QR code to the left or goto our website: http://www.taco-hvac.com.

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