HTP EFT-399 - Manual (Page 53)

53
LP-387 REV. 6.10.14
Strain on the gas valve and fittings may result in vibration, premature component failure and gas leakage, and result in fire, explosion,
property damage, severe personal injury, or death.
Adjustments to the throttle screw or offset may only be made by a qualified gas technician using a calibrated combustion analyzer
capable of measuring CO
2
and CO. Failure to follow this instruction could result in fire, explosion, property damage, severe personal
injury, or death.
PART 8 – FIELD WIRING
ELECTRICAL SHOCK HAZARD - Turn off electrical power supply at service entrance panel before making any electrical connections.
Failure to do so can result in 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:
1. National Electrical Code and any other national, state, provincial or local codes
or regulations.
2. In Canada, CSA C22.1 Canadian Electrical Code Part 1, and any local codes.
B. FIELD WIRING TERMINATIONS
All connections made to the boiler in the field are done inside the electrical junction
box located on the left side of the boiler. Multiple knockout locations are available
to route field wires into and out of the electrical junction box. See Figure 30.
C. FIELD WIRING
The control used in the boiler is capable of directly controlling 1 pump in standard
mode and 2 pumps when configured as a cascade master boiler. As a standard
boiler, each pump can provide a maximum of 4 amps at 120 volts. If a pump
requires more than this amount of power, an external contactor or motor starter is
needed. If the boiler is configured as a cascade master, the system pump output is
a dry contact output capable of switching 5 amps at 120 volts, in addition to the
boiler pump output sourcing 4 amps each.
The electrical junction box has separate, clearly marked terminal strips for line
voltage and low voltage wiring. Special jacks are provided for trouble-free cascade
system wiring using standard CAT3 or CAT5 patch cables.
NOTE: If local electrical codes or conditions require an additional service switch,
the installer must provide and install a fused disconnect or 15 amp (minimum)
service switch.
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.
Figure 30 – Knockout Locations