Installation and Maintenance Manual

Installation - Electrical
RLC-SVX09H-EN 111
Depending on the type to be used, theTechView Service
Tool must be used to configure the LLID and the MP for the
proper input type that is being used.This is accomplished
by a setting change on the Custom Tab of the
Configuration View withinTechView.
The J2-3 and J2-6 terminal is chassis grounded and
terminal J2-1 and J2-4 can be used to source 12 VDC.The
ECLS uses terminals J2-2 and J2-3. ECWS uses terminals
J2-5 and J2-6. Both inputs are only compatible with
high-side current sources.
Chilled Water Reset (CWR)
CH530 resets the chilled water temperature set point
based on either return water temperature, or outdoor air
temperature. Return Reset is standard, Outdoor Reset is
optional.
The following shall be selectable:
• One of three ResetTypes: None, Return Water
Temperature Reset, Outdoor AirTemperature Reset, or
Constant Return Water Temperature Reset.
• Reset Ratio Set Points.
• For outdoor air temperature reset there shall be both
positive and negative reset ratio's.
• Start Reset Set Points.
• Maximum Reset Set Points.
The equations for each type of reset are as follows:
Return
CWS' = CWS + RATIO (START RESET - (TWE -TWL))
and CWS' > or = CWS
and CWS' - CWS < or = Maximum Reset
Outdoor
CWS' = CWS + RATIO * (START RESET -TOD)
and CWS' > or = CWS
and CWS' - CWS < or = Maximum Reset
where
CWS' is the new chilled water set point or the "reset CWS"
CWS is the active chilled water set point before any reset
has occurred, e.g. normally Front Panel,Tracer, or ECWS
RESET RATIO is a user adjustable gain
START RESET is a user adjustable reference
TOD is the outdoor temperature
TWE is entering evap. water temperature
TWL is leaving evap. water temperature
MAXIMUM RESET is a user adjustable limit providing the
maximum amount of reset. For all types of reset, CWS' -
CWS < or = Maximum Reset.
In addition to Return and Outdoor Reset, the MP provides
a menu item for the operator to select a Constant Return
Reset. Constant Return Reset will reset the leaving water
temperature set point so as to provide a constant entering
water temperature.The Constant Return Reset equation is
the same as the Return Reset equation except on selection
of Constant Return Reset, the MP will automatically set
Ratio, Start Reset, and Maximum Reset to the following.
RATIO = 100%
START RESET = Design DeltaTemp.
MAXIMUM RESET = Design DeltaTemp.
The equation for Constant Return is then as follows:
CWS' = CWS + 100% (Design DeltaTemp. - (TWE -TWL))
and CWS' > or = CWS
and CWS' - CWS < or = Maximum Reset
When any type of CWR is enabled, the MP will step the
Active CWS toward the desired CWS' (based on the above
equations and setup parameters) at a rate of 1 degree F
every 5 minutes until the Active CWS equals the desired
CWS'.This applies when the chiller is running.
When the chiller is not running, CWS is reset immediately
(within one minute) for Return Reset and at a rate of 1
degree F every 5 minutes for Outdoor Reset.The chiller
will start at the Differential to Start value above a fully reset
CWS or CWS' for both Return and Outdoor Reset.
Figure 45. Wiring examples for ECLS and ECWS/EHWS
Reset
Type
Reset
Ratio
Range
Start Reset
Range
°F (°C)
Max Reset
Range
°F (°C)
Increment Factory
Default
ValueIP SI
Return
10 to
120%
4 - 30
(2.2 - 16.7)
0 - 20
(0.0 - 11.)
1% 1% 50%
Outdoor
80 to
-80%
50 - 130
(10 - 54.4)
0 - 20
(0.0 - 11.1) 1% 1% 10%