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Component Testing
Verifying High Pressure and Low Pressure Switch Oper
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Verifying High and Low Pressure Switch Operation
The unit's pressure switches (LO PS - S87 and HI PS - S4) are factory-wired into the control on the LO-PS and HI-PS termin
als, respectively.
Low Pressure Switch (LO-PS) - See figure 28 for low pressure switch sequence of operation.
High Pressure Switch (HI-PS) - See figure 29 for high pressure switch sequence of operation.
The following pressures are the auto-reset event value triggers for low and high pressure thresholds:
D
High Pressure (auto-reset) - trip at 590 psig; reset at 418.
Low Pressure (auto-reset) - trip at 40 psig; reset at 90.
D
CHECKOUT
Using a multimeter set to ohms with the terminals disconnected from the control board, check the resistance between the
two terminals of the pressure switch. If the resistance reading is 0 ohms, the switch is closed.
Figure 30. Verifying High Pressure and Low Pressure Switch Operation
Component Testing Table of Contents
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Pressure Switch Event Settings
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56
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59
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60
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61
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62
S4
HIGH
PRESSURE
SWITCH
53
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S87
LOW
PRESSURE
SWITCH
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63
64
65
66
67
70
75
XC20
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