Crown Boiler TWZ175, TWZ200, TWZ090, TWZ125, TWZ065, TWZ150, TWZ100, TWZ120, TWZ075 1312

DANGER

•PIPE RELIEF VALVE TO A SAFE LOCATION

•DO NOT INSTALL A VALVE IN THE RELIEF VALVE DISCHARGE LINE

•DO NOT MOVE RELIEF VALVE FROM FACTORY SPECIFIED LOCATION

•DO NOT PLUG RELIEF VALVE DISCHARGE

2)Circulator (Required) - Figure 10 shows the ideal location of the circulator which is in the supply piping immediately downstream of the expansion tank. A less ideal, but acceptable, location for most residential circulators is in the return (if this is done, be sure that adequate clearance exists to open the door.

3)Expansion Tank (Required) - If this boiler is replacing an existing boiler with no other changes in the system, the old expansion tank can generally be reused. If the expansion tank must be replaced, consult the expansion tank manufacturer’s literature for proper sizing.

4)Fill Valve (Required) - Either a manual or automatic fill valve may be used. The ideal location for the fill is at the expansion tank.

5)Automatic Air Vent (Required) - At least one automatic air vent is required. Manual vents will usually be required in other parts of the system to remove air during initial fill.

6)Low Water Cut-Off (Required in some situations) - A low water cut-off is required when the boiler is installed above radiation. In addition, some codes such as ASME CSD-1 require low water cut-offs. Codes may also require that this low water cut-off have a manual reset function. The low water cut-off may be a float type or probe type, but must be designed for use in a hot-water system. The low water cut-off should be piped into the boiler supply just above the boiler with no intervening valves between it and the boiler.

Use a low water cut-off that breaks the 120 VAC supply to the boiler. Do not attempt to wire a 24-volt low water cut- off into the boiler factory wiring.

7)Manual Reset High Limit (Required by some codes) - This control is required by ASME CSD-1 and some other codes. Install the high limit in the boiler supply piping just beyond the boiler with no intervening valves. Set the manual reset high limit as far above the operating limit setting as possible, but not over 240°F. Wire the control to break the 120 VAC electrical supply to the boiler.

8)Flow Control Valve (Required under some conditions) - The flow control valve prevents flow through the system unless the circulator is operating. A flow control valve may be necessary on converted gravity systems to prevent gravity circulation. Flow control valves are also used to prevent “ghost flows” in circulator zone systems through zones that are not calling for heat.

9)Isolation Valves (Optional) - Isolation valves are useful if the boiler must be drained, as they will eliminate having to drain and refill the entire system.

10)Drain Valve - The drain valve is shipped in the boiler parts bag. Install it in the tee on the boiler return as shown in Figure 1.

IMPORTANT

THE 1 1/2” PLUGGED TAPPING ON THE BOTTOM REAR SECTION IS

PRESENT FOR MANUFACTURING PURPOSES ONLY. DO NOT ATTEMPT

TO USE THIS TAPPING AS A RETURN CONNECTION.

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