Crown-boiler KSZ175 User Manual download pdf (Page 22)

X Wiring

1) 120 Volt Wiring - Provide the boiler with its own 15A branch circuit with fused disconnect. How the 120 volt connec-

tions are made depends upon the type of low water cut-off supplied with the boiler.

For boilers equipped with Hydrolevel CG450 - 120 Volt connections are made inside the CG450:

• Connect Hot (“black”) to terminal #1 in CG450

• Connect Neutral (“white”) to terminal #2 in CG450

• Connect Ground (“green” or bare) to green screw on case of CG450

For boilers equipped with McDonnell & Miller #67 low water cut-offs - 120 Volt connections are made inside the

junction box mounted on the low water cut-off:

• Connect Hot (“black”) to black pigtail in junction box

• Connect Neutral (“white”) to white pigtail in junction box

• Connect Ground (“green” or bare) to green screw in junction box

2) Thermostat Wiring - Follow thermostat manufacturer instructions. To insure proper thermostat operation, avoid instal-

lation in areas of poor air circulation, hot spots (near any heat source or in direct sunlight), or cold spots (outside walls,

walls adjacent to unheated areas, locations subject to drafts). Provide Class II circuit between thermostat and boiler. Con-

nect thermostat wire leads to terminals “T” and “T” on the burner primary control.

3) Optional Tankless Heater Wiring - Install the L4006A with the 3/4 NPT well in the 3/4 tapping in the center of the coil

plate. Make sure that the sensing bulb of this control is fully bottomed out in the well. Route the wire harness from this

control to the “T” and “T” (thermostat) terminals on the burner primary control so that they are in parallel with the space

heating thermostat.

Indirect Water Heater Wiring

Figure 17 shows eld wiring for an indirect water heater. A Honeywell R845A or equivalent DPST relay and transformer

is required. The high limit described in Part VIII must also be supplied by the installer. A call for heat from the indirect

water heater thermostat will energize the relay making both sets of contacts. One set of these contacts then energizes the cir-

culator. The other set of contacts will make the “T” and “T” contacts on the burner primary control, ring the burner. If the

boiler water temperature exceeds the high limit setting of 180F, the high limit will open the “T” - “T” circuit and the burner

will shut down.

If there is a call for space heat, the heating thermostat will make the “T”-”T” circuit and the boiler will re without regard

to the status of the indirect water heater. The low water cut-off and pressure limit control will interrupt 120 volt power to the

burner in the event of a low water or excessive pressure condition.

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).

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Crown-boiler KSZ175 User Manual Page 22