IX Wiring, CB502 System Single Zone Wiring

IX Wiring

The CWD Series boiler is offered with two different types of control systems:

•CB502 Control System - Basic operation of the boiler is controlled with a “CB502 control” (Crown part #42-502) located in the left side of the boiler vestibule. This device controls one or two circulator zones without the use of additional controls and includes LEDs to show the status of the circulators, inducer, and other boiler controls.

•R8285 Control System - Basic operation of the boiler is controlled by a Honeywell R8285 fan center. This system controls a single zone, although it can be used in a multiple zone system through the use of additional controls. No diagnostic LEDs are included in this system.

Both of these control systems use the same gas valves, ignition system components, and pressure switches. Separate wiring instructions are provided for each of these two control systems in the following two sections.

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).

•If a low water cut-off is installed, wire it to break the 120VAC supply to the boiler. Attempting to wire a 24 volt low water cut-off into the boiler, or otherwise modifying any of the 24 volt boiler wiring, will void the ANSI Z21.13 certiﬁcation of this boiler and may cause unsafe boiler operation.

A.CB502 System - Single Zone Wiring

1)Line Voltage (120 VAC) Connections (Fig 31) – The line voltage connections are located in the junction box under the transformer on the right side of the vestibule:

•Black – Line voltage “hot”

•White – “Neutral” for boiler and circulators

•Red – “Heating” circulator “hot”

•Blue – “Indirect Water Heater” circulator “hot” (This wire is not used in single zone installations)

•Green – Ground connection

2)Maximum circulator continuous current draw = 10A

3)Low Voltage (24 VAC) Connections (Fig 31) – These connections are screw terminals located on the front edge of the relay board:

•T-T Heat 1 – “Heating” thermostat connections

•T-T DHW/H2 – “Indirect Water Heater” thermostat connections

•Heat anticipator setting for both thermostat connections is 0.03 A.

4)Priority Switch – When this switch is “on”, the “heating” circulator is turned off when a call for heat is present from “indirect water heater” zone. It is used to ensure that the entire output of the boiler is available to the indirect water heater. This switch should come from the factory in the “off” position and should be turned on only when absolutely necessary to provide adequate domestic water.

5)Auxiliary Jumpers – Two jumpers are located on the relay board as shown in Figure 32. They are present for connection and conﬁguration of an auxiliary control. Unless instructions provided with the control call for these jumpers to be moved, they should remain as shown in Figure 32.

CAUTION

A problem with the indirect water heater zone could result in a total lack of heat and freeze damage to the building if this switch is in the priority “on” position.

•Ensure that the priority switch is “off” when it is not to be used.

•Set the priority switch “on” only when absolutely necessary.

•Do not leave the priority switch “on” when the building will be empty for an extended period of time.

CWD193, CWD165, CWD245, CWD220, CWD110 specifications

Crown Boiler Company is well-known for its commitment to quality and performance in the heating industry. Among its extensive range of products, the Crown Boiler CWD series stands out for its reliability and efficiency. This series includes models CWD060, CWD083, CWD110, CWD138, and CWD220, each designed to meet diverse heating needs in residential and commercial applications.

One of the main features of the CWD series is its durable construction. Made with high-quality materials, these boilers are built to withstand the test of time. The cast iron heat exchanger delivers exceptional heat retention and efficiency, ensuring optimal performance even in demanding conditions. Additionally, the CWD models are equipped with a reliable standing pilot ignition system, which enhances user safety and operational reliability.

Another important characteristic of the Crown CWD series is its versatility in fuel options. These boilers can operate on either natural gas or propane, providing flexibility to homeowners and businesses depending on their preferred energy source. The ability to easily switch fuels makes these units adaptable to various heating applications, maximizing convenience for users.

Efficiency is a cornerstone of the Crown Boiler CWD series. With an AFUE rating of up to 85%, these boilers deliver substantial cost savings over the heating season. Their efficient operation not only lowers energy bills but also contributes to a reduced environmental impact, which is increasingly important in today’s energy-conscious world.

Crown’s innovative design features also include a low water cut-off and a built-in draft hood. The low water cut-off ensures safe operation by preventing the boiler from running dry, while the draft hood allows for optimal venting capabilities, minimizing the risk of dangerous flue gas build-up.

Maintenance is straightforward with the CWD series, thanks to its easy-access design. Routine service and inspections can be performed with minimal disruption, ensuring that the units maintain peak performance over their lifespan.

The Crown Boiler CWD060, CWD083, CWD110, CWD138, and CWD220 models exemplify the brand’s dedication to delivering high-quality heating solutions. With their impressive efficiency ratings, durable construction, versatile fuel options, and user-friendly features, these boilers represent a smart investment for anyone looking to enhance heating reliability and comfort in their space.