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IX Wiring
Single Zone Wiring
1) 120 Volt Wiring - The boiler should be provided with its own 15A branch circuit with fused disconnect. All 120 volt
connections are made inside the L8148E aquastat relay as follows (also see Fig. 16 or 17):
• Hot (“black”) - Terminal “L1”
• Neutral (“white”) - Terminal “L2”
• Ground (“green” or bare) - Ground screw on case of L8148E
2) Thermostat Wiring - Follow thermostat manufacturer instructions. To insure proper thermostat operation, avoid
installation in areas of poor air circulation, hot spots (near any heat source or in direct sunlight), cold spots (outside
walls, walls adjacent to unheated areas, locations subject to drafts). Provide Class II circuit between thermostat and
boiler. Connect thermostat wire leads to terminals T and TV inside L8148E aquastat relay.
FIGURE 15: BOILER PIPING WITH CHILLER
WARNING
All wiring and grounding must be done in accordance with the authority having jurisdiction or, in the absence of
such requirements, with the National Electrical Code (ANSI/NFPA 70)
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