NA10334 G2.01 www.caleffi.com Z-one™ Relay Multi-Zone Pump Control © Copyright 2018 Caleffi ZSR10X series Function The ZSR series is a multi-zone pump and boiler operating control for multiple zone hydronic heating or cooling systems. The ZSR series interfaces with low voltage thermostats, or any other low voltage controllers having a switching action.
Dimensions POWER ZONE 1 A ZONE 2 ZSR106 Six switching relays - Input: 120VAC 50/60Hz 20A MAX ZONE 3 CAUTION: RISK OF ELECTRIC SHOCK - DISCONNECT ALL INPUT POWER PRIOR TO SERVICING 4009064 Conforms to UL 873 ZONE 4 ZONE 5 Milwaukee, WI 53208 USA ZONE 6 PUMP ON B C C Code ZSR103 Zones 3 A 9 1/4" B 11" C 3" Wgt. (lbs) 3.2 ZSR104 4 9 1/4" 11" 3" 3.2 ZSR106 6 9 1/4" 11" 3" 3.
Installation Inspect packages for damage. If damaged, notify the appropriate carrier immediately. If undamaged, open the package and inspect the device for obvious damage. Return damaged products.
Dip switch settings The ZSR series of control is programmed by positioning five dip switches for the following operations. MASTER SLAVE Master / Slave: allows for unlimited expansion to additional ZSR or ZVR relays boards. PRIORITY ON OFF Priority ON / OFF: When priority switch is ON, upon REMOTE ENABLE ON OFF demand to TSTAT 1 , ZONE 1 will operate as priority EXERCISE ON OFF and all other zones are temporarily switched off (with 1 hour time-out).
Communication terminals Z-oneLink™ unlimited expansion allows connecting additional ZSR & ZVR series relay controls to a Master ZSR or ZVR. Communication is accomplished by connecting three wires (thermostat wire) to the communication terminals D P located in the upper right hand corner. The dip switch is positioned to Master / COMMS Slave position. A demand for heat from any zone will fire the boiler and start the pump.
Example Wiring Diagram Please reference Z-one™ Relay wiring guide for complete listing of wiring diagrams.
Non-Condensing boiler with indirect DHW space heating thermostats DHW aquastat AUX X X ZONE 1 R E/S T W R C T COM T-STAT 1 W T R C T COM T-STAT 2 W T R C T COM T-STAT 3 T W R C T COM W T T-STAT 4 C T COM T-STAT 5 space heating demand R T W MASTER L N G T T ZC P COMMS POWER SLAVE PRIORITY ON OFF REMOTE ENABLE ON OFF EXERCISE ON OFF POST PURGE ZONE#1 ON OFF domestic water heating demand boiler reset controller D C T COM T-STAT 6 ZONE1 ZONE2 ZONE3 TR
ModCon boiler with primary/secondary and to / from zone loads zone expansion resistance heat source C1 C2 C3 C4 C5 C7 C6 C9 C8 C10 C11 C12 temperature sensor (in well) PRIMARY PUMP VENT space heating thermostats AUX X X ZONE 1 R E/S T W R C T COM T-STAT 1 W T R C T COM W T T-STAT 2 R C T COM T-STAT 3 W T R C T COM W T T-STAT 4 R C T COM W T D C POWER MASTER TRANSFORMER P COMMS T COM T-STAT 6 T-STAT 5 ZONE1 SLAVE PRIORITY ON OFF REMOTE ENABLE
1
WIRING GUIDE The ZSR101 is a versatile single relay control with two outputs for operating a 120 VAC pump with boiler enable, or two 120 VAC devices without boiler enable. Features include rear knock outs for 4x4 junction box mounting, convenient pre-installed jumper for pump operation, and 10 amp total load rating. The ZSR Series of controls is for zoning using pumps. Up to 6 zone pumps (model dependent) along with a primary pump can be operated. Zone priority is selectable with 1-hour time-out feature.
INDEX Z-one Relay thermostat connections Thermostat wiring ........................................................................................................................................................................... 4 Zone valve wiring to ZVR series ....................................................................................................................................................... 5 ZSR101 - single zone relay Product overview .................................................
NDS Z-one Thermostat Connections 2-Wire Thermostats 4-Wire Thermostats All Caleffi Z-one controls use the same interface to connect to thermostats. This interface is very flexible and allows many different types of thermostats to be connected to the control including 2, 3 and 4 wire versions. In addition, any type of switching device can be used to signal a heat demand by connecting the R & W (T & T) terminals together. The terminals are dual labeled to help simplify wiring.
Wiring zone valve to Caleffi ZVR control Wiring a standard zone valve to Caleffi Z-one Relay must be connected to terminal 3 on the zone valve. Failure to follow schematic will lead to damage of product. Since a two wire actuator does not have an end switch for feedback to the ZVR control, the end switch terminals must have a jumper to simulate the end switch. If the end switch jumper is not installed, no demand will be sent to the boiler and the pumps will not turn on.
6 ZSR101 - Single Zone Switching Relay Certified to CSA C22-2 No.
Operating Principles When a zone has a demand from a thermostat (TT or R W) the relay will close sending 120 VAC to Relay #1 NO terminal R W and switching the pump R TW C T on, and the C to NO dry T T COM contact on relay #2 closes, signaling the boiler of a heating demand. Dual labeled T-stat terminals. Compatible with 2, 3 and 4 wire T-stats. Replaceable fuses. 6 VA Transformer. C COM PWR PWR R, W, C and T T Comm dual labeling at thermostat terminals.
8 A1 - Single thermostat R T W C T com power zone transformer N L CalefÞ! single zone relay RELAY 1 RELAY 2 C N/O N/C C N/O N/C N L Hydronic diagram is for illustration purposes only, some components have been removed for simplicity.
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (live leg of 120 VAC) C = Common terminal NO = Normally Open terminal NC = Normally Closed terminal Note: There is a factory installed jumper between the 120 VAC line (L) and the common terminal of relay #1 (C). Sequence of Operation / Settings • A demand occurs from the thermostat closing R to W on the ZSR101 control. The “ZONE” LED illuminates. • The ZSR101 control will power relay #1 and #2 closing C to NO.
10 A2 - Multiple thermostats power zone transformer N L R CalefÞ! single zone relay RELAY 1 RELAY 2 C N/O N/C C N/O N/C N L Hydronic diagram is for illustration purposes only and could be missing system components.
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (live leg of 120 VAC) C = Common terminal NO = Normally Open terminal NC = Normally Closed terminal Note: There is a factory installed jumper between the 120 VAC line (L) and the common terminal of relay #1 (C). Sequence of Operation / Settings • A demand occurs from one of the thermostats which sends power (from a separately sourced transformer) to the corresponding zone valve.
12 A3 - Single master thermostat, panel radiators with TRVs, variable speed pump TRV TRV thermostatic radiator valves (TRV) on each radiator TRV TRV TRV TRV R T buffer tank W C T com power zone transformer ZSR101 N L N L Hydronic diagram is for illustration purposes only, some components have been removed for simplicity.
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (live leg of 120 VAC) C = Common terminal NO = Normally Open terminal NC = Normally Closed terminal Note: There is a factory installed jumper between the 120 VAC line (L) and the common terminal of relay #1 (C). Sequence of Operation / Settings • A demand occurs from the thermostat closing R to W on the ZSR101 control. The “ZONE” LED illuminates. • The ZSR101 control will power relay #1 and #2 closing C to NO.
14 ZSR10X - Multi-Zone Pump Control Certified to CSA C22-2 No.
AUX closes on a demand for heat from any zone. Rated for 120 VAC 2 Amps. X X closes on a demand for heat from any zone. Rated for 120 VAC 2 Amps. ZONE1 /ES closes only during a demand from zone 1. Rated for 120 VAC 2 Amps. Dual labeled T-stat terminals. Compatible with 2, 3 and 4 wire T-stats. Selectable DIP switches. 3 wire communications to expansion board. Power ON LED. LED for each zone. Replaceable fuses (2 extra included under cover).
16 Cover removal Hold either the left or the right end of the box up and at an angle. Use body for stabilizing relay box. Insert screwdriver and push tab inward, cover should release from base. Mounting: Do not mount to a surface that exceeds 115°F (45°C). The unit must be only located in dry interior locations. Use only copper conductor supply wire suitable for at least 105° C. All circuits must have a common disconnect and be connected to the same pole of the disconnect.
E/S T T T T TT COM COM T COMT T T TCOM COM TCOM COMTT T TT COM TCOM COMTT T TT TCOM COMTT T T T COMCOMM TT COM COM COMMS TT TCOM COM COM TT 12 3 T-STAT 23 4 T-STAT 345 T-STAT 456 T-STAT T-STAT56 1 2 T-STAT T-STAT T-STAT T-STAT T-STAT T-STAT T-STAT 1 T-STAT T-STAT T-STAT T-STAT T-STAT T-STAT 6 The ZSR series of control is programmed by positioning five dip POWE MASTER SLAVE MASTER SLAVE MASTER switches for the following operations.
18 Pump 4 Pump 3 Pump 1 Pump 2 B1 - Mod/con boiler, hydro separator or buffer tank, zone pumps Buffer tank- Optional hydraulic separator AUX X X ZONE 1 R E/S T W C T COM T-STAT 1 R W T C T COM T-STAT 2 R W T C T COM T-STAT 3 R T W R C T COM T T-STAT 4 W C T COM T-STAT 5 R T W D C P COMMS T COM T-STAT 6 MASTER POWER SLAVE PRIORITY ON OFF REMOTE ENABLE ON OFF EXERCISE ON OFF POST PURGE ZONE#1 ON OFF ZONE1 ZONE2 ZONE3 TRANSFORMER ZONE4 ZSR106 6 Zone
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
20 Pump 6 Pump 5 Pump 1 boiler high limit control Pump 4 Pump 2 Pump 3 B2 - Traditional boiler, indirect DHW w/ priority, zone pumps DHW aquastat DHW aquastat AUX X X ZONE 1 R E/S T W C T COM T-STAT 1 R W T C T COM T-STAT 2 R W T C T COM T-STAT 3 R T W R C T COM T T-STAT 4 W C T COM T-STAT 5 R T W D C P COMMS T COM T-STAT 6 MASTER POWER SLAVE PRIORITY ON OFF REMOTE ENABLE ON OFF EXERCISE ON OFF POST PURGE ZONE#1 ON OFF ZONE1 ZONE2 ZONE3 TRANSFORM
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
22 Pump 3 Pump 2 Pump 1 B3 - Mod/Con boiler, primary loop, closely spaced tees, zone pumps boiler pump Primary pump AUX X X ZONE 1 R E/S T W C T COM T-STAT 1 R W T C T COM T-STAT 2 R W T D C P COMMS T COM T-STAT 3 POWER MASTER TRANSFORMER SLAVE PRIORITY ON OFF REMOTE ENABLE ON OFF EXERCISE ON OFF POST PURGE ZONE#1 ON OFF ZONE1 ZONE2 ZONE3 ZSR103 3 Zone REMOTE ENABLE POWER IN N GROUNDS 24 - 120 VAC N L PRIORITY PUMP 1 L N PUMP 2 L N PUMP 3 N L PRIMARY PUMP
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
Pump 4 Pump 3 Pump 1 Pump 2 B4 - Mod/con boiler with warm weather shut down, hydro separator or buffer tank, zone pumps Buffer tank- Optional hydraulic separator Boiler with outdoor reset/ warm weather shut down and pump control AUX X X ZONE 1 R E/S T W C T COM T-STAT 1 R W T C T COM T-STAT 2 R W T C T COM T-STAT 3 R T W D C P COMMS T COM T-STAT 4 MASTER Boiler Pump Output 120VAC POWER SLAVE PRIORITY ON OFF REMOTE ENABLE ON OFF EXERCISE ON OFF POST PURGE ZONE#1 O
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
26 ZVR10X - Multi-Zone Valve Control Certified to CSA C22-2 No.
AUX closes on a demand for heat from any zone. Rated for 120 VAC 2 Amps. X X closes on a demand for heat from any zone. Rated for 120 VAC 2 Amps. Dual labeled T-stat terminals. Compatible with 2, 3 and 4 wire T-stats. ZONE1 /ES closes only during a demand from zone 1. Rated for 120 VAC 2 Amps. Dip switches 3 wire communications to expansion board. Power ON LED. Transformer connections. LED illuminates when end switch closes. LED illuminates with call for heat. 120 VAC input power connection.
Cover removal Hold either the left or the right end of the box up and at an angle. Use body for stabilizing relay box. 28 Insert screwdriver and push tab inward, cover should release from base. Roll cover off base. Remove transformer(s) packaging. Slide bottom end of transformer into bottom latch. Transformer Installation Mount box on stable surface using level. from Snap top of transformer into latch arms. Mounting: Do not mount to a surface that exceeds 115°F (45°C).
E/S AUX ON T OFF T COM T-STAT 1 T T COM T-STAT 2 T T COM T-STAT 3 T T COM T-STAT ZONE4 DURING PRIORITY DEMAND ZONE Thermostat connections Maintenance and Repair: The Caleffi Z-one™ multi-zone valve relay comes with a automatic resettable fuse and requires no maintenance. If control fails or is damaged, replace control with functional one. ZSR106 OFF ON OFF ON R = 24 VAC.
30 C1 - Mod/Con boiler, hydro separator, zone valves mod/con boiler ZV1 SYSTEM pump ZV2 ZV3 ZV4 ZV5 ZV6 SECONDARY pump AUX X X ZONE 1 R E/S T W R C T COM T T-STAT 1 W C T COM T-STAT 2 R T W C T COM T-STAT 3 R T W C T COM T-STAT 4 R T W C T COM T-STAT 5 R T W D C P COMMS T COM T-STAT 6 POWER ZONE 1 MASTER SLAVE PUMP EXERCISE ON OFF PRIORITY ON OFF AUX ON OFF ZONE 2 ZONE 3 ZONE 4 DURING PRIORITY DEMAND ZONE 5 ZVR106 SEC PUMP N L ON ZONE #1 PUMP N
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
32 C2 - Mod/Con boiler, priority indirect DHW on primary side of hydro sep, zone valves mod/con boiler ZV2 ZV3 ZV4 ZV5 ZV6 DHW aquastat DHW PRIORITY pump SECONDARY pump SYSTEM pump DHW AQUASTAT AUX X X ZONE 1 R E/S T W C T COM T-STAT 1 R T W C T COM T-STAT 2 R T W C T COM T-STAT 3 R T W C T COM T-STAT 4 R T W C T COM T-STAT 5 R T W C D P COMMS T COM T-STAT 6 POWER ZONE 1 MASTER SLAVE PUMP EXERCISE ON OFF PRIORITY ON OFF AUX ON OFF ZONE 2 ZONE 3 ZONE
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
34 C3 - Mod/Con boiler, priority indirect DHW on load side of hydro sep, zone valves Buffer tank- optional hydraulic separator ZV2 SECONDARY pump SYSTEM pump DHW PRIORITY pump DHW AQUASTAT DHW AQUASTAT AUX X X ZONE 1 R E/S T W C T COM T-STAT 1 R T W C T COM T-STAT 2 R T W C T COM T-STAT 3 R T W C T COM T-STAT 4 R T W C T COM T-STAT 5 R T W D C P COMMS T COM T-STAT 6 POWER ZONE 1 MASTER SLAVE PUMP EXERCISE ON OFF PRIORITY ON OFF AUX ON OFF ZONE 2 ZONE 3 Z
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
36 C4- Mod/Con boiler, priority indirect DHW on primary side of hydro sep, expansion control NOTE: 120 VAC is only sent to the SEC PUMP terminals on the control that receives the call for heat. For instance, if a zone from the Master control calls, the SEC PUMP on the Master control sends 120 VAC and SEC PUMP on the Slave control does not. When using a single secondary pump with 2 (or more) controls you must wire the secondary pump to the SEC PUMP terminals on all of the controls.
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
38 ZV6 ZV5 ZV4 SYSTEM pump ZV3 ZV2 C5 - Traditional boiler, indirect DHW (no priority) with pump, zone valves DHW PRIORITY pump DHW aquastat DHW aquastat AUX X X ZONE 1 R E/S T W C T COM T-STAT 1 R T W C T COM T-STAT 2 R T W C T COM T-STAT 3 R T W C T COM T-STAT 4 R T W C T COM T-STAT 5 R T W C D P COMMS T COM T-STAT 6 POWER ZONE 1 MASTER DHW SLAVE PUMP EXERCISE ON OFF PRIORITY ON OFF AUX ON OFF ZONE 2 ZONE 3 ZONE 4 DURING PRIORITY DEMAND T T ZONE
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
40 ZV6 ZV5 ZV4 SYSTEM pump ZV3 ZV2 C6- Traditional boiler with priority indirect DHW with valve, zone valves DHW ZV1 DHW aquastat DHW aquastat AUX X X ZONE 1 R E/S T W C T COM T-STAT 1 R T W C T COM T-STAT 2 R T W C T COM T-STAT 3 R T W C T COM T-STAT 4 R T W C T COM T-STAT 5 R T W C D P COMMS T COM T-STAT 6 POWER ZONE 1 MASTER SLAVE PUMP EXERCISE ON OFF PRIORITY ON OFF AUX ON OFF ZONE 2 ZONE 3 ZONE 4 DURING PRIORITY DEMAND ZONE 5 ZVR106 SEC PUMP
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
C7 - Mod/Con boiler, hydro separator, zone valves (more than 6), multiple secondary pumps 42 "B" pump "A" pump A1 A2 A3 A4 A5 A7 A8 A9 A10 A11 A12 A6 SYSTEM pump AUX X X ZONE 1 R E/S T W C T COM T-STAT 1 R T W C T COM T-STAT 2 R T W C T COM T-STAT 3 R T W C T COM T-STAT 4 R T W C T COM T-STAT 5 R T W D C AUX X X P COMMS T COM T-STAT 6 ZONE 1 R E/S T W C T COM T-STAT 1 POWER R T W C T COM T-STAT 2 R T W C T COM T-STAT 3 R T W C T COM T-STAT
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
C8 - Mod/Con boiler, indirect DHW on primary side of hydro sep, zone valves, ECM pump enable mod/con boiler ZV2 ZV3 ZV4 DHW aquastat DHW PRIORITY pump SECONDARY pump SYSTEM pump DHW AQUASTAT AUX X X ZONE 1 R E/S T W C T COM T-STAT 1 R T W C T COM T-STAT 2 R T W C T COM T-STAT 3 R T W D C P COMMS T COM T-STAT 4 POWER ZONE 1 MASTER SLAVE PUMP EXERCISE ON OFF PRIORITY ON OFF AUX ON OFF ZONE 2 ZONE 3 ZONE 4 DURING PRIORITY DEMAND ZVR104 4 Zone STATUS DURING ZONE #
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
C9 - Mod/Con boiler, hydro separator, Zone 1 low temp pump, zones 2 - 6 high temp zone valves mod/con boiler ZONE 1 Pump ZV2 SYSTEM pump ZV3 ZV4 ZV5 ZV6 SECONDARY pump AUX X X ZONE 1 R E/S T W R C T COM T T-STAT 1 W C T COM T-STAT 2 R T W C T COM T-STAT 3 R T W C T COM T-STAT 4 R T W C T COM T-STAT 5 R T W D C P COMMS T COM T-STAT 6 POWER ZONE 1 MASTER SLAVE PUMP EXERCISE ON OFF PRIORITY ON OFF AUX ON OFF ZONE 2 ZONE 3 ZONE 4 DURING PRIORITY DEMAND ZO
Description of terminals = Ground N = Neutral (Common leg of 120 VAC) L = Line (Hot leg of 120 VAC) Thermostat terminals R = 24 VAC W = Heat call C = Common of 24 VAC Boiler terminals XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically connected to TT on boiler control, closes when any zone calls including priority. ZONE 1 E/S = Dry contact rated up to 120 VAC, 2 Amps, will close with any call to ZONE 1. Zone 1 can be enabled as a priority zone, typically used for heating domestic hot water.
48 Caleffi North America, Inc. / 3883 W Milwaukee Rd / Milwaukee, WI 53208 Tel: 414.238.2360 / Fax: 44.238.2366 www.caleffi.com / Ask.Us@caleffi.
