Menu Item Description
RTHC-SVD01B-EN 11
Factory Settings:
• Maximum Acceleration Timer #1 = 6
• Maximum Acceleration Timer #2 = 249
• Acceleration Time Out Action = Transition
2-6. Leaving Water Temperature Control
Rather than having one setting for the leaving water temperature
(LWT) control response, UCP2 has a separate setting for the three
parts of the PID (Proportional, Integral, Derivative) algorithm.
The items that can be set in UCP2 are:
Located in Service Settings, Field Start-up Group (++--++)
• LWT Proportional Gain Setpoint (0-100% /F)
• LWT Integral Gain Setpoint (0-1% /F)
• LWT Derivative Gain Setpoint (0-1000%/F)
Factory Settings: The LWT settings are dependent on the unit size.
Refer to the RTHC-IOM for the correct settings.
It is strongly recommended that the factory defaults listed in
RTHC-IOM be used without adjustment.
2-7. EXV Settings
The Electronic Expansion Valve (EXV) regulates the flow of refrigerant
into the evaporator, to match the compressor capacity (mass flow
rate). Refer to Figure 2-2 for a diagram of the EXV. This provides
increased part load efficiencies. The EXV modulates off of the evapo-
rator liquid level. If the liquid level is below 0.0”, the EXV is com-
manded to open. If the level is above 0.0”, the EXV is commanded to
close.
The item that can be set in UCP2 are:
Located in Service Settings, Machine Configuration Group (+-+-+-)
• EXV Size (01-04)
Factory settings: The EXV size is dependent on unit size. Refer to
RTHC-IOM-1C for correct settings.
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