10
Demand Limit (Switch Controlled) —
A field-sup-
plied pair of dry contacts can be used to provide one or two
steps of demand limit. The dry contacts must be connected to
TB6. Connect the contacts for Demand limit step one to
TB6-12, 13. Connect the contacts for Demand Limit step two
to TB6-14, 15. This is a step function which will limit the over-
all chiller capacity to pre-configured percentages when the
switch contacts close. Follow the steps outlined in Table 4 to
enable the function and configure a demand limit of 70% for
step one and 40% for step two.
The configuration is now complete. The overall chiller ca-
pacity (CAP, under the Run Status mode, submode VIEW) will
now be reduced to 70% when Demand Limit switch 1 is
closed. The capacity will be further reduced to 40% when De-
mand Limit switch 2 is closed. The actual demand limit switch
inputs seen by the control can be viewed by accessing the items
DLS1 and DLS2, located under the Inputs mode, submode
GEN.I.
Table 4 — Menu Configuration of Demand Limit Mode (Switch Controlled)
MODE
(RED LED)
KEYPAD
ENTRY
SUBMODE
KEYPAD
ENTRY
ITEM DISPLAY ITEM EXPANSION COMMENTS
CONFIGURATION
DISP
UNIT
OPT1
OPT2
RSET CRST 0
CRT1 125
CRT2 0
DGRC 0
DMDC 0
DEMAND LIMIT
SELECT
0 SCROLLING STOPS
0 FLASHING ‘0’
1SELECT ‘1’
1 CHANGE ACCEPTED
DMDC 1
DEMAND LIMIT
SELECT
ITEM/VALUE/UNITS
SCROLLING RETURNS
DM20 100
SHNM 0
SHDL 0
SHTM 60
DLS1 80
DEMAND LIMIT
SWITCH 1
80 SCROLLING STOPS
80 FLASHING ‘80’
70 SELECT ‘70’
70 CHANGE ACCEPTED
DLS1 70
DEMAND LIMIT
SWITCH 1
ITEM/VALUE/UNITS
SCROLLING RETURNS
DLS2 50
DEMAND LIMIT
SWITCH 2
50 SCROLLING STOPS
50 FLASHING ‘50’
40 SELECT ‘40’
40 CHANGE ACCEPTED
DLS2 40
DEMAND LIMIT
SWITCH 2
ITEM/VALUE/UNITS
SCROLLING RETURNS
ENTER
ENTER
ENTER
ENTER
ENTER
ESCAPE
ENTER
ENTER
ENTER
ESCAPE
ENTER
ENTER
ENTER
ESCAPE
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