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short from triac Gate to Triac terminal 2. A volt me ter
can be used to determine if a Triac is turned on or off.
Measure across the Triac; from Triac terminal 1 to Triac
terminal 2. When the Triac is turned off, the volt age will
be ap prox i mate ly 20 to 30VAC; when turned on, it will
be <10VAC.
The Pre-rotation Vanes Actuator is manufactured by
Barber-Coleman. This actuator has three windings; a
Field winding and two direction windings. One di rec tion
wind ing produces clockwise rotation, the other pro duc es
coun ter clock wise rotation. The 115VAC applied to the
Field Winding induces a 20 to 30VAC voltage into each
of the direction windings. The desired ro ta tion is pro-
duced by shorting the Actuator common ter mi nal to the
ap pro pri ate direction terminal, causing current to fl ow in
the di rec tion winding. As described above, Triacs con trol
the current through the open and close wind ings.
The Refrigerant Level Variable Orifi ce Actuator on new
production chillers is manufactured by Belimo. This ac-
tu a tor has two windings; open and close. One wind ing
pro duc es clockwise rotation and one produces coun ter -
clock wise rotation. This actuator operates from 24VAC.
As described above, Triacs are turned on to al low cur rent to
fl ow through the appropriate winding to produce the de sired
rotation. If the OptiView Control Center is retrofi t to an ex-
isting chiller, it could be equipped with a Barber-Coleman
Level Actuator that operates as de scribed above.
RELAY TIMING
Under Program control, the relays are energized and
de-energized producing contact operation as follows.
Unless otherwise noted, contact rating is 5 amps re sis tive
or 2 Amps inductive @ 250VAC.
K0 - Chilled Water Pump Starter (TB2-44/45)
Dry closure contacts. When the chiller is started, the Con-
tacts close 13 seconds after the start of "System Prelube".
Normally, they open coincident with the com ple tion of
"Sys tem Coastdown" with the fol low ing ex cep tions:
a. If a "Leaving Chilled Liquid - Low Tem per a ture"
cy cling shutdown occurs, they do not open at the
com ple tion of "System Coastdown". They remain
closed for the duration of the shutdown or until the
Keypad COMPRESSOR switch is placed in the
Stop-Reset (O) position, whereupon they open.
b. If Microboard Program Switch SW1-8 is in the ON
position, they do not open at the completion of "Sys-
tem Coastdown" when the chiller shuts down on a
"Multiunit Cycling - Contacts Open" or "Sys tem
Cy cling - Contacts Open" cycling shut down. They
re main closed for the duration of the shut down or until
the Keypad COMPRESSOR switch is placed in the
Stop-Reset (O) position, where up on they open.
38
K1 - Anticipatory Alarm (TB2-55/56)
Dry closure con tacts. Contacts close when one of the
fol low ing Warn ing messages is Displayed. On most
warn ings, the con tacts automatically open when the
warning con di tion is no longer present. On those warn-
ings marked with an as ter isk, the contacts will open only
after the warn ing condition is no longer present and the
WARN ING RESET key is pressed when logged in at
OP ER A TOR ac cess level or higher.
Real Time Clock Failure, Condenser or Evaporator Trans-
duc er Error*, Refrigerant Level Out of Range, Standby
Lube-Low Oil Pressure*, Setpoint Over ride*, Condens-
er-High Pressure limit, Evaporator-Low Pres sure Limit,
Vanes Uncalibrated-Fixed Speed, Har mon ic Filter-Op-
eration In hib it ed, Harmonic Filter-Data Loss, Har mon ic
Filter-Input Fre quen cy Out Of Range. The following only
applies to Flash Memory Card version
and lat er – Ex cess Surge Detected*, Surge Detected – Ex cess
Surge Limit.
K2 - Remote Mode Ready to Start (only oper-
ational in Digital, Analog or ISN Remote mode)
(TB2-26/27)
Dry closure status contacts that are closed to indicate to
a Remote device that the chiller will start upon re ceipt
of a remote start signal. The contacts open co in ci dent
with any Cycling or Safety shutdown or anytime the
Keypad COM PRES SOR switch is placed in the Stop -
Reset (O) po si tion. On Cycling shutdowns, the con tacts
will close when the cycling condition clears. On safety
shutdowns, the con tacts will close only after the Safety
condition clears, a manual reset is per formed by plac ing
the COM PRES SOR switch in the Stop-Reset (O) posi-
tion and then back to the RUN (I) position.
K3 - Safety Shutdown Status (TB2-42/43)
Dry clo sure status contacts. They close coincident with
a Safe ty shutdown. They remain closed until the safety
con di tion clears and a manual reset is performed by
placing the COMPRESSOR switch in the Stop-Reset(O)
po si tion, whereupon they open.
K4 - Cycling Shutdown Status (TB2-40/41)
Dry clo sure status contacts. They close coincident with a
Cy cling shutdown. They remain closed until the cy cling
condition clears, whereupon they open.
K5 - Condenser Motor Pump Starter (TB2-150/
151) (applies to Flash Memory Card version
C.MLM.01.04.xxx and lat er)
Dry closure contacts. Contacts close coincident with be-
gin ning of "SYSTEM RUN". They open coincident with
the beginning of "SYSTEM COASTDOWN" un less the
chiller is equipped with the Mod "B" Solid State Starter.
FORM 160.54-M1(503)
C.MLM.01.05.xxx
YORK INTERNATIONAL
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