HTP 399M - Manual (Page 54)

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PART 9 – FIELD WIRING
ELECTRICAL SHOCK HAZARD – Turn off electrical power supply at service entrance panel before making any electrical connections.
Failure to do so can cause severe personal injury or death.
Wiring must be N.E.C. Class 1. If original wiring supplied with the boiler must be replaced, use only UL Listed TEW 105
o
C wire or
equivalent. Boiler must be electrically grounded as required by National Electrical Code ANSI/NFPA 70 – Latest Edition.
In order to ease future servicing and maintenance, it is advised to label all wires. Wiring errors can cause improper and dangerous
operation. Failure to follow these instructions could result in property damage or personal injury.
A. INSTALLATION MUST COMPLY WITH:
National Electrical Code and any other national, state, provincial or local codes or regulations.
In Canada, CSA C22.1 Canadian Electrical Code Part 1, and any local codes.
B. FIELD WIRING
The boiler box has a 24 volt terminal strip on the boiler cabinet and a 120 volt terminal strip enclosed in the electrical box. Each terminal
connection is clearly marked to assure correct installation.
C. LINE VOLTAGE WIRING
1. Connect 120 VAC power wiring to the line voltage terminal strip located inside the electric junction box, as shown in Figure 30.
2. Wire the Boiler Primary Circulator (P1) to the terminal strip. See wiring diagram in this section.
D. THERMOSTAT
1. Connect room thermostat or end switch.
2. Install thermostat on inside wall away from influences of drafts, hot or cold water pipes, lighting fixtures, television, sunrays or
fireplaces.
3. Thermostat anticipator (if applicable):
a. If connected directly to boiler, set for 0.1 amps.
b. If connected to relays or other devices, set to match total electrical power requirements of connected devices. See
specifications of the device and thermostat instructions for details.
To avoid electrical shock, turn off all power to the boiler prior to opening an electrical box within the unit. Ensure the power remains off
while any wiring connections are being made. Failure to follow these instructions could result in component or product failure, serious
injury, or death. Such product failure IS NOT covered by warranty.