Crown Boiler TWZ175 - Manual (Page 22)

20
FIGurE 18: tWO-PIPE lIFt sYstEM
X 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 con-
nections are made inside the L7248 or L7224 aquastat relay as follows (also see Fig. 19):
• Hot (“black”) - Terminal “L1”
• Neutral (“white”) - Terminal “L2”
• Ground (“green” or bare) - Ground screw on case of L7248 or L7224
2) Thermostat Wiring - Follow thermostat manufacturer instructions. To insure proper thermostat operation, avoid installa-
tion 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 “T” inside L7248 or L7224 aquastat relay.
WARNING
ALL WIRING AND GROUNDING MUST BE DONE IN ACCORDANCE WITH THE
AUTHORITY HAVING JURISDICTION OR, IN THE ABSENCE OF SUCH AUTHORITY,
WITH THE NATIONAL ELECTRIC CODE (ANSI/NFPA 70).