York MAXE OPTIVIEW YK Service Instructions Manual page 12

System Ar chi tec ture
• Flow Sensor – Paddle type or Factory Mounted
Thermal Type. The paddle type applies 115Vac to
the I/O Board Digital inputs TB4-12 (evaporator)
and TB4-11 (condenser) (refer to fi g 14). The fac-
tory mounted Thermal type (available with Style F
and later chillers), applies +5Vdc to the microboard
Analog inputs at J7-14 (evaporator) and J7-16
(condenser)(refer to fi g 12). Flash Memory Card
version C.MLM.01.07.xxx and C.MLM.01.07A.xxx
automatically selects the Flow Sensor input, either
digital or analog per the Chiller Style/Compressor
Setpoint selection. Flash Memory Card version
C.MLM.01.08.xxx and later allows use of either
the Thermal-type or the Paddle-type fl ow sensors
on style F and later chillers. With these versions,
the actual fl ow sensor type present must be entered
using the Flow Switch Setpoint (refer to SECTION
23).
• Oil Heater Outputs – Either TB1-34 or TB1-64 on
I/O Board
• Refrigerant Level Control Default Period – Either
3.5 seconds or 10.0 seconds
• "Oil – Variable Speed Pump-Pressure Setpoint Not
Achieved" safety shutdown threshold – Either 25
PSID or 35 PSID
When the compressor motor is driven by an Electro-
Mechanical Starter, the OptiView Control center is
equipped with a CM-2 Current Module. This printed
circuit board pro vides cur rent overload and power fault
pro tec tion for the com pres sor motor. Current Trans-
form ers, lo cat ed in the com pres sor motor terminal box,
along with rec ti fy ing and cal i bra tion circuitry, provide
an an a log volt age rep re sent ing com pres sor motor current
to the CM-2 Mod ule. This sig nal is further conditioned
and pro vid ed to the Microboard.
When the compressor motor is driven by a YORK Sol id
State Starter, there could be either of two dif fer ent Sol id
Starters applied. Later production chillers are equipped
with the Mod "B" Sol id State Start er. This start er con-
tains a com bi na tion Log ic/Trig ger Board that in ter fac es
the Microboard via a serial com mu ni ca tions link. Ear li er
vin tage chillers are equipped with the Mod "A" Sol id
State Start er. This starter con tains a Trig ger Board that
in ter fac es to a Logic Board that is in stalled inside the
OptiView Control Cen ter. The Logic Board in ter fac es
the Microboard via a mul ti plexed data in ter face.
12
When the compressor motor is driven by the YORK
Variable Speed Drive (VSD), the OptiView Control
Center is equipped with an Adaptive Capacity Con-
trol Board. This print ed cir cuit board mon i tors system
pa ram e ters and controls the VSD to drive the com pres sor
at the slow est speed it will op er ate with out surging, while
main tain ing required chiller capacity.
Serial data interface to the YORK ISN Building Au to -
ma tion System is through the optional MicroGateway.
This print ed circuit board re quests the re quired data
from the Microboard and makes it avail able for the
ISN net work.
FORM 160.54-M1(503)
YORK INTERNATIONAL