Field Wiring - NTI FTG 600 Installation And Operation Manual

FTG

12.0 FIELD WIRING

All wiring must be in accordance with the Canadian Electrical code, CSA C22.2 and any applicable local codes.
Ensure that the wiring complies with this manual. The boiler must be electrically grounded in accordance with
the National Electrical Code ANSI/NFPA 70, local codes, and/or the Canadian Electrical Code CSA C22.1.
Power Supply – The required power supply varies between boiler models; connect a power supply matching the
description provided below for the respective boiler model:
 FTG 600-1400 – 120V / 1Ph / 60Hz, fused (or protected via a circuit breaker) to a maximum of 15 Amps.
 FTG 2000 – 120V / 1Ph / 60Hz, fused (or protected via a circuit breaker) to a maximum of 20 Amps.
 FTG 2200 – 208V / 3Ph / 60Hz, fused (or protected via a circuit breaker) to a minimum of 15 Amps.
 FTG 2400 – 240V / 3Ph / 60Hz, fused (or protected via a circuit breaker) to a minimum of 15 Amps.
Failure to connect the correct power supply, fused as specified, may result in component
failure, serious injury or death.
Avoid Shocks - To Avoid Electrical Shock, turn off electrical power to the boiler prior to
opening any electrical box within the unit. Ensure the power remains off while any
wiring connections are being made. Failure to follow these instructions may result in
component failure, serious injury or death.
Wire Protection - When passing any wiring through the cabinet of the boiler, the
installer must use wire grommets, or strain reliefs, suitable for securing the wiring and
preventing chafing. Failure to follow instructions may result in component failure,
serious injury or death.
Labeling - Label all wires prior to disconnecting them when servicing controls. Wiring
errors can cause improper and dangerous operation. Failure to follow instructions may
result in property damage or personal injury.
Continuity - Before connecting the line voltage wiring, perform a continuity check
between all wires and ground to make sure that there are no electrical leaks that could
blow a fuse or damage electrical components.
Line Voltage Connections
Line voltage field wiring enters the back of the boiler through strain reliefs (field supplied), then routes
internally via a chase-way on the right-hand side of the boiler, to the line voltage junction box located at the
front of the boiler on the right-hand side. Remove the Front and Top-Front panels to access the junction box and
chase-way; see Figure 12-1. Secure field wiring to the chase-way using the factory supplied wire supports.
Terminate line voltage field wiring in accordance with instructions provided in Figure 12-2 and Table 12-1.
FTG 2200-2400 – the 3-phase power supply connects at a factory installed disconnect switch at the back of the
boiler; see Figure 12-1. From the disconnect, the 3-phase wiring is factory routed internally to a Fuse Block
where it is distributed to the combustion blower and 120V transformer; see Figure 12-2. NOTICE: 120V is
factory wired to the Line Voltage Junction Box.
Pump Relays – The FTG incorporates three non-powered isolation relay contacts for switching high capacity
pumps. Contact Secondary Maximum rating is 1.5HP @ 120V, 3.0HP @ 240V, or 30A. Refer to Figure 12-2
for Field Wiring requirements.
Low Voltage Connections
Low voltage field wiring enters the back of the boiler through grommets (factory supplied), then routes
internally, via a chase-way on the left-hand side of the boiler, to the low voltage junction box located at the front
of the boiler on the left-hand side. Remove the Front and Top-Front panels to access the junction box and chase-
way; see Figure 12-1. Secure field wiring to the chase-way using the factory supplied wire supports. Terminate
low voltage field wiring in accordance with instructions provided in Figure 12-3 and Table 12-2.
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