User control interface for heat transfer system

1. A heat transfer system comprising:

a compressor for circulating a working fluid, the compressor having an inlet and an outlet, the compressor operable at a controllable operating capacity;

a condenser connected to the outlet of the compressor, the condenser configured to receive flow of water to be heated;

an electrically controlled valve positioned to receive the working fluid from the outlet of the condenser;

an evaporator connected between an outlet of the electrically controlled valve and the inlet of the compressor, the evaporator configured to receive flow of waste-heat bearing fluid;

pressure and temperature sensors positioned to measure pressures and temperatures of the heat transfer system; and

a controller connected to the pressure and temperature sensors, the electrically controlled valve, and the compressor, the controller configured to control the heat transfer system according to one or more of compressor suction superheat, compressor discharge superheat, compressor suction pressure, compressor discharge pressure, and water temperature, the controller including a touchscreen configured to display a user control interface configured to display one of a first view, a second view and a third view based on a permissions database defining different types of users,

wherein the different types of users include an operator user type having permission to access the first view, a superintendant user type having permission to access the second view, and a manufacturer user type having permission to access the third view:

the first view including a compressor capacity graph, a hot water temperature output field to display a current hot water temperature, and a hot water input field to adjust a hot water set point;

the second view including the compressor capacity graph, a compressor suction superheat graph, a compressor discharge superheat graph, the hot water temperature output field, a compressor inlet temperature output field, a compressor outlet temperature output field, and a first plurality input fields to adjust the hot water set point, a suction superheat setpoint, a minimum discharge superheat temperature, and a maximum suction pressure; and

the third view including the compressor capacity graph, the compressor suction superheat graph, the compressor discharge superheat graph, the hot water temperature output field, the compressor inlet temperature output field, the compressor outlet temperature output field, error code output fields, and a second plurality input fields to adjust the hot water set point, the suction superheat setpoint, the minimum discharge superheat temperature, the maximum suction pressure, and a plurality of control loop parameters (PID) to control a suction superheat control loop, a discharge superheat control loop, and a suction pressure control loop.

2. The system of claim 1 , wherein the controller is configured to require password protected login for at least one of the different types of users.

3. The system of claim 1 , wherein the permissions database permits input of control loop parameters by the manufacturer user type and prevents input of control loop parameters by the superintendant user type and the operator user type.

4. The system of claim 1 , wherein the controller is configured to control the heat transfer system according to all of compressor suction superheat, compressor discharge superheat, compressor suction pressure, compressor discharge pressure, and water temperature.

5. The system of claim 1 , wherein the operator user type has permission to adjust the hot water set point.

6. The system of claim 1 , wherein the superintendent user type has permission to adjust the hot water set point, the suction superheat setpoint, the minimum discharge superheat temperature, and the maximum suction pressure.

7. The system of claim 1 , wherein the manufacturer user type has permission to adjust the hot water set point, the suction superheat setpoint, the minimum discharge superheat temperature, the maximum suction pressure, and the plurality of control loop parameters (PID) to control the suction superheat control loop, the discharge superheat control loop, and the suction pressure control loop.

8. A method of controlling a heat transfer system, the method comprising:

controlling a compressor and an electrically controlled valve for circulating a working fluid according to one or more of compressor suction superheat, compressor discharge superheat, compressor suction pressure, compressor discharge pressure, and temperature of water received at a condenser to be heated by waste-heat bearing fluid in an evaporator; and

displaying on a touchscreen a user control interface configured to display one of a first view, a second view and a third view based on a permissions database defining different types of users,

wherein the different types of users include an operator user type having permission to access the first view, a superintendant user type having permission to access the second view, and a manufacturer user type having permission to access the third view:

the first view including a compressor capacity graph, a hot water temperature output field to display a current hot water temperature, and a hot water input field to adjust a hot water set point;

the second view including the compressor capacity graph, a compressor suction superheat graph, a compressor discharge superheat graph, the hot water temperature output field, a compressor inlet temperature output field, a compressor outlet temperature output field, and a first plurality input fields to adjust the hot water set point, a suction superheat setpoint, a minimum discharge superheat temperature, and a maximum suction pressure; and

the third view including the compressor capacity graph, the compressor suction superheat graph, the compressor discharge superheat graph, the hot water temperature output field, the compressor inlet temperature output field, the compressor outlet temperature output field, error code output fields, and a second plurality input fields to adjust the hot water set point, the suction superheat setpoint, the minimum discharge superheat temperature, the maximum suction pressure, and a plurality of control loop parameters (PID) to control a suction superheat control loop, a discharge superheat control loop, and a suction pressure control loop.

9. The method of claim 8 , further comprising requiring password protected login for at least one of the different types of users.

10. The method of claim 8 , wherein the permissions database permits input of control loop parameters by the manufacturer user type and prevents input of control loop parameters by the superintendant user type and the operator user type.

11. The method of claim 8 , comprising controlling the heat transfer system according to all of compressor suction superheat, compressor discharge superheat, compressor suction pressure, compressor discharge pressure, and temperature of the water.

12. The method of claim 8 , wherein the operator user type has permission to adjust the hot water set point.

13. The method of claim 8 , wherein the superintendent user type has permission to adjust the hot water set point, the suction superheat setpoint, the minimum discharge superheat temperature, and the maximum suction pressure.

14. The method of claim 8 , wherein the manufacturer user type has permission to adjust the hot water set point, the suction superheat setpoint, the minimum discharge superheat temperature, the maximum suction pressure, and the plurality of control loop parameters (PID) to control the suction superheat control loop, the discharge superheat control loop, and the suction pressure control loop.