BCBC Client Comfort System (CCS) - Design Manual

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8.3.1 Pump Pressure Control

The following provides a cost comparison of various methods of controlling pump pressure.

Example:

Using contractor cost assuming a 1 HP hot water pumping system with two way control valves and pressure differential control connected to CCS.

Conclusion:

When ASDs are installed to replace conventional motor starters and electrical protection equipment as well as mechanical pressure differential control devices they can provide a low capital cost solution.

To achieve total savings insure the following:

1. Supplied ASDs are CSA approved for overload protection.
2. Insure local electrical inspection will accept as total CSA device.
3. Insure electrical consultant, electrical contractor and CCS contractor do not install conventional equipment.
4. Insure mechanical consultant does not specify conventional mechanical control devices.
5. Use lower voltages on small motors.
6. Specify inverter duty motors.

Other benefits:

1. Improved control from terminal regulated water volume (TRWV) concepts. Actual maximum two way control valve position would control speed.
2. Reduced valve and pump maintenance resulting from lower pressure drop.
3. Possibly lower cost valves because of low pressure drop. Electrical actuators have a problem with high head shut off.
4. Piping noise reduction.
5. Reduced energy consumption.
6. Increased temperature differential will improve efficiency of boiler, reduce piping losses, etc.

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