Water Economizer Cooling; Y Call (Cooling Or Heating) - Carrier Omnizone 50BV020-064 Installation, Start-Up, Service And Controls Operation And Troubleshooting

WATER ECONOMIZER COOLING

The unit diverts condenser inlet waterflow through an optional
economizer coil to pre-cool evaporator entering airflow. If the en-
tering water temperature is colder than the setting on the Aquastat
and the return-air temperature is warmer than the setting on the re-
turn air thermostat, the two-position diverting valve will direct wa-
ter to the economizer coil.
Y1 = 1
YES
POWER / SWITCHES / SENSOR
STATUS CHECK
V > 18VAC
YES
HPC = 1
YES
LPC = 1
YES
FRZ. > TEMP
LIM
YES
CON > 0
YES
INITIAL
POWER UP
YES
NO
NO
NO
START TIME
NO
START TIME
NO
NO
START
ANTI SHORT CYCLE
NO
START
RANDOM START UP
Fig. 39 — UPM Sequence of Operation (SOO) Flow Chart
Economizer water flow is in series with the condensers allowing
compressor operation while the economizer is operating.

Y CALL (COOLING OR HEATING)

The UPM will energize the compressor's output (CC) in an event
of a "Y" Call from a thermostat or controller (after the random
start-up and/or the anti-short cycle delays have elapsed). The Y
input terminal must be energized with a 24 vac signal.
BLINK CODE ON STATUS LED
SOFT LOCKOUT
RECORD ALARM
START COUNTER
(IF APPLICABLE)
YES
TIME > 120
SEC
NO
YES
TIME > 30
SEC
NO
NO
T > ASC OR
RS SEC
52
LOCKOUT CAN BE SET TO
4 VIA DIP SWITCH
COUNT = 2
NO
YES
CC OUTPUT = OFF
BLINK CODE ON STATUS LED
REPORT ALARM FAULT
HARD LOCKOUT
ALR OUTPUT = ON/PULSE
YES
CC OUTPUT = ON