Hydromatic I Chiller Operation Manual
Table Of Contents
- Contents
- Introduction
- System Features
- Operator Controls & Display Panel
- Modes of Operation
- Using the Hydro-matic
- Program Mode
- MAS Settings Not Saved
- Programming Change Notice
- MAS Program Values
- Hydro-Matic Override Toggle Switches
- Trouble Shooting With the Override Toggle Switches
- Program Parameter Table
- Theory of Operation
- Fault Detection and Failsafe Protocols
- Fault Detection and Failsafe Protocols
- Line Voltage Failsafe Protocols
- Sensor Installation Notes
- Applications
- Product Specifications
- Jumper Settings & Part Numbers
- Board Layout and Jumper Locations
- Trouble Shooting Guide
- List of Figures
- List of Tables
PAGE 13
HYDRO-MATIC OPERATIONS MANUAL
REV.03 COPYRIGHT © 1998
THEORY OF OPERATION
Heating/Cooling Cycles
The Cooling and Heating cycles are controlled by four factors: the inlet
water temperature, the current operating mode (Heat or Cool), the
programmed setpoint (items P-1 and P-2), and the programmed Staging
Temperature (items P-3 and P-4). Please note that there are separate
setpoints and staging temperatures for heating and cooling.
The control algorithm is the same for both heating and cooling. In Cool
Mode, the control is satisfied when the inlet water temperature reaches the
programmed Cool Setpoint (P-2). In Heat Mode, the control is satisfied
when the inlet water temperature reaches the programmed Heat Setpoint
(P-1).
The following discussion assumes system cooling. Figure 2, Cooling
Cycle illustrates this example. There are four staging levels of cooling.
Level 0 corresponds to the programmed setpoint. Levels 1 through 4 are
separated by the programmed staging temperature.
The cooling cycle starts when the inlet water temperature rises above
Level 1. At this time, a lead compressor is selected and turned on. Once
the inlet water temperature reaches Level 0, the compressor will be turned
off and the cooling cycle is ended. The lead compressor is changed
(advanced) each time to allow for equal use of all compressors. If the inlet
water temperature rises above level 2 during a cooling cycle, the Hydro-
figure 2: Cooling Cycle