Field Wiring - NTI Vmax VM153 Installation And Operation Manual

Vmax I&O Manual
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 – Vmax are designed to be powered using a single phase 120VAC power
supply that is fused (or protected via a circuit breaker) to allow a maximum of 15 Amps.
Failure to follow instructions 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.
Wiring Connections
Electrical rating for the Vmax is 120V / 1 Phase / 60 Hz / 12A. All line voltage wiring connections to the Vmax are
made at the junction box on the control panel located at the bottom of the boiler cabinet. The connections are
accessed by removing the front door of the boiler, followed by the removal of the control panel cover; see Figure
12-1. Field wiring enters the cabinet through holes located on the bottom (underside) of the boiler cabinet; use
suitable strain-relief grommets to protect the wires. Field wiring connections are to be installed in accordance
with instructions provided in Figure 12-2 and Table 12-1.
Controller Fuse (120VAC) – the Vmax controller is equipped with a 3.15 Amp fuse that protects most
120VAC circuits within the boiler, as well as any circulators connected to it. A spare fuse is located to the
left of the operating fuse in an open holder; see Figure 12-1.
Blower Fuse (120VAC) – an inline 7 Amp fuse, located in a fuse holder in the blower's power wire (black wire
above the controller), protects the 120VAC circuit of the combustion blower; see Figure 12-1.
Wire Protection – When passing wiring through the cabinet of the boiler, the
installer must use wire grommets suitable for securing the wiring and preventing
chafing. Failure to follow instructions may result in component failure, serious injury
or death.
Figure 12-1 Wiring Terminal Access
Controller Fuse – 3.15A
®
5x20mm Slo-Blo
Spare Fuse
│Cascade Instructions
Inline Blower Fuse
(3AG 7A 250 Fast-acting)
– breaks blower power wire
Field Wiring
Terminals
Control Panel Cover
55