1-23
INSTALLATION
SL 30-175, SL 45-260 MODULATING GAS BOILERS
Removing wiring box covers
Line voltage power block terminals
Line voltage pump block terminals
eleCtriCal ConneCtions
all electrical wiring to the boiler (including grounding) must conform to local
electrical codes and/or national electrical Code, ans/nFPa no. 70 – latest
edition, or the Canadian electrical Code, C22.1 - Part 1.
1.8.1 120vac Line voltage Hook-up
Line-voltage wiring is done within the field-wiring box.
(Refer to Section 6.2.Wiring
Diagram on page 6-4).
Connect the boiler to the grid power using a separate, fused
circuit and on/off switch within sight of the boiler. use minimum 14-gauge wire in
BX cable or conduit 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, add
a 12” pigtail to bring 120v to the bottom pair of contacts on the green Pump/
Zone Valve terminal Block located on the upper right-hand edge of the controller.
the upper 3 pairs of contacts on this green connector strip are then powered
to manage up to 3 load pumps – the top pair for load 1, the second pair for #2
etc. once the controller is programmed for the respective loads, the boiler will
manage all the loads without need of further relays (oK for loads up to 1/3 HP;
for more – use a protective relay).
The green Pump/Valve terminal strip is not
pre-wired because some 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) and is
accessible in the field wiring box below the controller. – do not attempt to connect
the primary pump 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’s Black wire to the Yellow of this pair (switched Hot). the White/ Yellow pair
should be individually capped if the primary pump does not obtain its power from
this pair.
Pumps can be switched on/off using the keypad, so there is no need for
temporary pump wiring during system filling / air purging. If pumps are
hard-wired to the panel during the system fill/purge phase, re-wire the
boiler pump to the Primary Pump leads inside the wiring box, to enable the
water flow proving routine to run.
in a new construction application-
use a construction thermostat to a “Therm”
terminal for on/off management of the boiler. Do not just pull power from
the unit, or its moisture management routine will be interrupted
(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) any water in the clear vinyl air
reference tubes. this has been seen occasionally at construction sites where the
boiler has been repeatedly de-powered wet.
the combined current of all pumps connected through the on-board pump relays
should not exceed 10 amps.
1.8.2 Power quality and Electrical Protection
in areas of unreliable power, appropriate surge protectors and/or power
conditioning equipment should be installed in powers supply wiring circuits.
CAUTION
The internal pump relays in the
IBC control have a maximum
rating of 5 Amps or 1/3 H.P.
each, with a maximum total
allowable draw of 10 amps.
Isolation contactors MUST be
used if electrical loads exceed
these maximums.
1.8
Summary of Contents for SL 30-175
Page 76: ...NOTES...
