Electrical Connections; 120 Vac Line Voltage Hook-Up - IBC SL 20-160 G3 Installation And Operating Instructions Manual

Line voltage leads for power supply,
primary pump and VS output
Line voltage load pump terminals
CAUTION
The internal pump relays are
protected with 5 Amp fuses. The
maximum recommended load
on each fuse is 4 Amps (80% of
rating). The maximum combined
pump load is 10 Amps. Isolation
relays or contractors MUST be
used if the loads exceed these
maximums.
1-32
SL 10-85 G3, SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS
Gas piping must have a sediment trap ahead of the boiler's gas valve (see Figure 44). A
manual shutoff valve must be located outside the boiler, in accordance with local codes/
standards. All threaded joints in gas piping should be made with an approved piping
compound resistant to the action of natural gas/propane. Use proper hangers to support
gas supply piping as per applicable codes.
The boiler must be disconnected or otherwise isolated from the gas supply during any
pressure testing of the system at test pressures in excess of 1/2 psig. Dissipate test
pressure prior to reconnecting. The boiler and its gas piping shall be leak tested before
being placed into operation.
The gas valve is provided with pressure taps to measure gas pressure upstream (supply
pressure) and downstream (manifold pressure) of the gas valve (see Figure 44). Note that
manifold pressure varies slightly in accordance with firing rates with the modulating series
boilers, but will always be close to 0" w.c.
Figure 42: Typical gas piping connection

1.8 ELECTRICAL CONNECTIONS

All electrical wiring to the boiler (including grounding) must conform to local electrical
codes and/or the National Electrical Code, ANS/NFPA No. 70 – latest edition, or the
Canadian Electrical Code, C22.1 - Part 1.

1.8.1 120 VAC 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 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 5 typical residential size pumps) is less than 4 amps.
The 120 VAC power supply to the load pumps (P/V1, P/V2, P/V3, and P/V4) has been
factory installed and connected to P/V-L and P/V-N for your convenience. The upper
4 pairs of contacts on this green connector strip are then powered to manage up to 4
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 manages all the loads without need of
further relays (for loads up to 1/3 HP for more – use a protective relay).
INSTALLATION AND OPERATION INSTRUCTIONS