IBC Technologies SL 20-115 Installation And Operating Instructions Manual
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1-29INSTALLATIONSL 20-115 MODULATING GAS bOILEReleCtriCal ConneCtionsall electrical wiring to the boiler (including grounding) must conform to localelectrical codes and/or national electrical Code, ans/nFPa no. 70 – latestedition, or the Canadian electrical Code, C22.1 - Part 1.1.8.1 120vAC Line voltage Hook-upLine-voltage wiring is done within the field-wiring box. (Refer to Section 6.2.WiringDiagram on page 6-4). Connect the boiler to the grid power using a separate, fusedcircuit and on/off switch within sight of the boiler. use 14-gauge wire in BX cable orconduit properly anchored to the boiler case for mains supply and pump circuits.Connect a 120 VaC / 15 amp supply to the “AC IN” tagged leads in the wiring box.the max. actual draw (with 4 typical residential size pumps) is less than 4 amps.if primary / secondary piping is used, with pumps to manage multiple loads, adda 12” pigtail to bring 120v to the bottom pair of contacts on the Pump/ Zone Valveterminal Block located on the upper right-hand edge of the controller. the upper3 pairs of contacts on this green connector strip are then powered to manage upto 3 load pumps – the top pair for load 1, the second pair for #2 etc. once thecontroller is programmed for the respective loads, the boiler will manage all theloads without need of further relays (oK for loads up to 1/3 HP; for more – use aprotective relay). The green Pump/Valve terminal strip is not pre-wired becausesome installations will use it to manage 24 v zone valves.the primary pump is connected to the White/Yellow pair labeled Primary Pump.this lead is factory wired to the controller (and its 120 VaC supply) at the upperright backside of the controller board – do not attempt to connect the primarypump to the Pump/Zone Valve terminal Block along the controller’s right edge- this is for the secondary pumps and/or zone valves only. Connect the pump’sBlack wire to the Yellow of this pair (switched Hot). the White/ Yellow pair shouldbe individually capped if the primary pump does not obtain its power from thispair (e.g. if a variable speed primary pump is connected to the mains power).If a parallel pump piping configuration is used rather than primary/secondary,loop the White/Yellow Primary Pump pair up to connect this to the lowest pairof contacts on the green Pump/Valve terminal strip, then connect the two loadpumps in the normal way – this will bring power to the pump control block.Pumps can be switched on/off using the keypad, so there is no need fortemporary pump wiring during system filling / air purging. If pumps arehard-wired to the panel during the system fill/purge phase, re-wire theboiler pump to the Primary Pump leads inside the wiring box so the primarypump purge function is active.in a new construction application- use a construction thermostat – or jumperwith in-line on/off switch – for on/off management of the boiler. Do notjust pull power from the unit, or its moisture management routine will beinterrupted (fan turns at ultra low rpm for 90 minutes after burner shutdown).treat it like a computer, where you do not just pull the plug when done. if an“Insufficient airflow / check vent” error signal shows, check for (and remove) anywater in the clear vinyl air reference tubes. this has been seen occasionally atconstruction sites where the boiler has been repeatedly de-powered wet.the combined current of all pumps connected through the on-board pump relaysshould not exceed 10 amps. the control circuit board is protected using on-boardfield replaceable fusing.1.8Removing wiring box coversLine voltage leads for power supply,primary pump and VS outputLine voltage load pump terminalsCAUTIONThe internal pump relays in theIBC control have a maximumrating of 5 Amps or 1/3 H.P.each, with a maximum totalallowable draw of 10 amps.Isolation contactors MUST beused if electrical loads exceedthese maximums. |
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