Cold Water RUN

Purpose

The Cold Water Run system utilizes a variable-speed pump to inject the proper amount of water from the main system loop into the boiler to maintain the opti- mum inlet temperature. This approach allows the full capacity of the boiler to be utilized to meet the system load, while at the same time continuously maintaining the optimum inlet water temperature to prevent con- densation.

Typical Cold Water Run

Applications

•Swimming pools.

•Snow melting.

•Low temperature radiant panel.

•Water source heat pumps.

•Any system with steady state return water temper- ature below 105°F.

CWR vs. CWS

•Cold water start is for transient cold water opera- tion.

•Cold water run is for continuous operation below 105°F system return temperature.

•Cold water start maintains design flow rate at sys- tem design temperature but reduces bolier flow rate during heavy by-pass operation.

•Cold water run maintains constant design flow rate in the boiler.

INSTALLATION

Before arriving at the job site to begin the installation, it's important to first inspect the system and determine what materials you will need. Some parts are includ- ed with the controller while others you will need to provide.

Installation Codes

Installations must be in accordance with local, state, provincial, and national codes, laws, regulations and ordinances. In the absence of local codes, installa- tions must be in accordance with the latest editions of the:

•National Fuel Gas Code, ANSI Z223.1/NFPA 54

•National Electrical Code, ANSI/NFPA 70

•For Canada only: CAN/CGA B149.1 installation Code (B149.1) and CSA C22.1 C.E.C. Part 1 and Part 2

Mounting the Control Box

NOTE: The heater should not be located in an area where possible water leakage will result in damage to the area adjacent to the heater or to the structure. When such locations cannot be avoided, it is rec- ommended that a suitable drain pan, with adequate drainage, be installed under the heater. The pan must not restrict combustion air flow.

The control box should be mounted on the side of the heater to which the system piping and pump assem- blies are to be attached. The controller should be mounted so as to provide maximum support by using the mounting holes provided on the base of the con- troller to the side center brace on the heater. You will need to drill mounting holes and holes through the heater side panel for the routing of wiring and the sen- sor. A template is supplied for field-installed kits to locate the control box properly.

CAUTION: Remote mounted controller must be installed within 25 feet of the heater.

Indoor and Outdoor

Installations

The cold water run control panel is rated for indoor use only. Do not mount or install the control panel in areas where dripping, flooding, rain, snow or spraying water may come in contact with the enclosure. If the injection pump is located outdoors, the optional outdoor cover must be installed according to the instructions in the following section. For outdoor installations mount the control panel indoors and route the wiring to the appro- priate connection points. Wire length is not to exceed 25 feet in any one direction. Contact your local sales representative for further information.