Filter
Top Products
SCXG-SVX01B-EN 113
• A “fan off” request to “supply fan
control”
• A “close damper” request to
“economizer actuator control”
• The water pump to turn on and position
all water valves to provide maximum
flow through all water source heat
exchangers
• Disables preheat function if WSM mixed
air temp sensor is selected as preheat
sensor
Reset Required: An automatic reset
occurs after one complete set of IPC
packets is received.
WSM Mixed Air Temp Sensor Fail
b. Activation Conditions: temperature <
-50°F or temperature > 209°F, and sensor
is selected for use by “waterside
economizer temperature enable
function” or “preheat function”
c. Time to React: 10 sec < T < 20 sec
e. Actions to be Initiated: “waterside
economizer temperature enable
function” uses supply air cooling setpoint
instead of mixed air temperature. If xixed
air temperature is used for “preheat
function”, issue a “disable” request to
“preheat function”.
f. Reset: An automatic reset occurs after
the mixed air temp. input returns to
within range continuously for 10 seconds.
Water Flow Fail
a. Data used (module,packet,byte,bit):
WSM, 01,19, 05
b. Activation Conditions: The water flow
input is detected open ;
1. at the end of precool water flow
initiation state, or
diagnostics
2. continuously for five minutes while:
·water side economizer is open 100%,
· presetting of a head pressure valve, or
· demand for mechanical cooling.
Unit must be: a. configured with water
cooled condenser and/or water
economizer and b. have water flow
switch installed.
c. Time to React: immediate
e. Actions to be Initiated: A “lockout all
ckts” request is issued to the
“compressor staging function”
f. Reset: An automatic reset occurs after
the water flow input returns to within
range continuously for 3 seconds, the
water pump is requested OFF, or the
water flow switch becomes not installed.
Z
Zone Cool Setpoint Failure
Problem: The occupied zone cooling
setpoint is out of range.
Reason for Diagnostic: The input
designated as occupied zone cooling
setpoint source is out of range (temp. <
45°F or temp > 94°F).
UCM Reaction: The active occupied zone
cooling setpoint reverts to the default
occupied zone cooling setpoint.
Reset Required: (PAR) an automatic reset
occurs after the designated occupied
zone CSP input returns to its allowable
range for 10 continuous seconds, or after
a different valid occupied zone CSP
selection source is user-defined.
Maintenance