User Guide

Part number 550-100-400/0717
31
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Field wiring — basic system (continued)
$ETAILED CONTROLINFORMATIONANDADDITIONALWIRING — see the ADVANCED INSTALLATION section of this
manual.
&IGURE Simplifi ed wiring — basic system with DHW and space heating (see ADVANCED section for more information)
Wire the DHW tank aquastat to the U-Control “heat demand 1” input, terminals P11 #4 and #5.
Wire the space heating thermostat (or zone controller or zone valve end switches) across the U-Control “heat demand 2”
input, terminals P15 #1 and #2.
Attach a sensor (supplied with boiler) to the system supply pipe and wire to terminals P14 #1 and #2.
[Locate sensor in the position shown in piping diagrams on page 11 through page 15 .]
Attach a sensor (supplied with boiler) to the system return pipe and wire to terminals P14 #2 and #3.
[Locate sensor in the position shown in piping diagrams on page 11 through page 15 .]
Install the outdoor temperature sensor (supplied with boiler) and wire to terminals P10 #1 and #2.
4HEOUTDOORSENSORMUSTBEINSTALLEDUNLESSSPECIlCALLYEXEMPTEDINTHE%NERGY!CTSTATEMENTONPAGE
Wire the DHW circulator (supplied by installer) as circulator 1, following instructions on Connect the boiler circulator (sup-
plied with boiler) as circulator 2, following instructions on page 30 .
Wire the boiler circulator (supplied with boiler) as circulator 2, following instructions on page 30 .
Wire the system circulator (supplied by installer) as circulator 3, following the instructions on page 30 .
Locate the sensors on the system
piping as shown in
Figure 4, page 11
and other piping drawings throughout
this manual.
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SERIES 4 GAS-FIRED WATER BOILER — Boiler Manual