HTP 850 LPHL - Manual (Page 39)

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LP- 205 REV. 3.28.14
PART 7 – 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
All connections made to the boiler in the field are done inside the electrical junction box located on the side of the unit. The electrical
junction box is located on the right side of the Mod Con 300, and the left side of both the Mod Con 500 and 850. Multiple knockout loca-
tions are available to route field wires into and out of the electrical junction box.
The control used in the Mod Con series of boilers is capable of directly controlling 2 pumps when in standard mode and 3 pumps when
configured as a cascade master boiler. When configured as a standard unit, each pump output can provide a maximum of 3 amps at
120 volts. If pumps used require 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 and DHW pump outputs sourcing 3 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.
C. LINE VOLTAGE WIRING
NOTE: A termination plug is included in the CAT 3 / CAT 5 Bus Connection Point,
labeled J3 in Figure 23. DO NOT REMOVE THIS PLUG! Doing so will affect boiler
operation and void warranty.
1. Connect the incoming power wiring to the line voltage terminal strip in the electrical
junction box at terminals LINE 120V, Neutral, and Ground (shown in Figure 23).
2. A line voltage fused disconnect switch may be required to be externally mounted and
connected according to local wiring codes.
3. Connect the central heating pump to the terminals marked BOILER HOT, BOILER
NEUT, and BOILER GRD. The connections shown are suitable for a maximum
continuous pump draw of 3 amps at 120 volts. If the pump requires more current or
voltage other than the 120 volts supplied, an external motor starter or contactor will be
required.
4. If using DHW, connect the domestic hot water pump to the terminals marked DHW HOT, DHW NEUT, DHW GND. The connections
shown are suitable for a maximum continuous pump draw of 3 amps at 120 volts. If a pump requires more current or voltage than the
120 volts supplied, an external motor starter or contactor will be required.
To avoid electrical shock, turn off all power to the appliance 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 22