Installation and Maintenance Manual

Controls Interface
164 RLC-SVX09H-EN
No Fan Controls (Water Cooled)
If this setting is set to “No Fan Controls (Water Cooled)”, the
unit shall be controlled exactly the same as an RTWD unit,
that is, that the control logic and sequences will assume
that there is a water cooled condenser and condenser
water pump control, condenser water flow proving, and
circuits start delay times associated with condenser water
pump prerun times shall be employed.The DynaView (and
TechView) shall display the condenser water temperatures
and condenser approach temperatures as defined
(although generally a RTUD unit will not ship with
condenser water temperature sensors installed and
bound) – for proper unit operation as a remote water
cooled condenser, the condenser water temperature LLIDs
will have to be field installed and bound.
Fan Control By Others
If this setting is set to “Fan Control By Others”, the first two
relays on the “Fan Control Interlock” quad relay output
board relays will function as interlock contacts for use as
in input to an external pressure or temperature based fan
controller on a per circuit basis. Concurrent with the
circuit’s EXV pre-position as part of the start sequence of
a given circuit, the respective “fan control interlock” relay
for that circuit will energize and close the NO contacts.
The respective relay shall be de-energized to return to its
normal state, once the circuit/compressor has stopped.
Note that this means the relay shall stay energized until the
compressor state is proven to be off.
Integral Fan Controls
If this setting is set to “Integral Fan Controls,” the fan
controls are integral to the CH530 main processor and
(depending on the selection for the other fan control
configurations - i.e. Fan Deck Arrangement Circuit 1
(FDA1), Fan Deck Arrangement Circuit 2 (FDA2), Low
Ambient Fan ControlType (LAFC)) shall control the
appropriate relays (and connected fans) and other outputs
(variable speed fan outputs and monitor VFD fault inputs)
to control the differential pressure per the chiller’s
requirements.
Low Ambient Fan Control Type
Note: Present if A/C Fan Control (ACFC) = Integral Fan
Control (INT)
Figure 68. A/C fan controls - RTUD
Figure 69. Low ambient fan control type