129
Step 4 — Fill the Chilled Water Loop
The chilled water pump (if equipped) is rated for 150 psig
(1034 kPa) duty. The maximum cooler water side pressure is 300
psig (2068 kPa). Check the pressure rating for all of the chilled
water devices installed. Do not exceed the lowest pressure rated
device.
WATER SYSTEM CLEANING
Proper water system cleaning is of vital importance. Excessive
particulates in the water system can cause excessive pump seal
wear, reduce or stop flow, and cause damage of other components.
1. Install a temporary bypass around the chiller to avoid circu-
lating dirty water and particulates into the pump package and
chiller during the flush. Use a temporary circulating pump
during the cleaning process. Also, be sure that there is capa-
bility to fully drain the system after cleaning. See Fig. 54.
2. Be sure to use a cleaning agent that is compatible with all
system materials. Be especially careful if the system con-
tains any galvanized or aluminum components. Both deter-
gent-dispersant and alkaline-dispersant cleaning agents are
available.
3. It is recommended to fill the system through a water meter.
This provides a reference point for the future for loop vol-
ume readings, and it also establishes the correct quantity of
cleaner needed in order to reach the required concentration.
4. Use a feeder/transfer pump to mix the solution and fill the
system. Circulate the cleaning system for the length of time
recommended by the cleaning agent manufacturer.
a. After cleaning, drain the cleaning fluid and flush the sys-
tem with fresh water.
b. A slight amount of cleaning residue in the system can
help keep the desired, slightly alkaline, water pH of 8 to
9. Avoid a pH greater than 10, since this will adversely
affect pump seal components.
c. A side stream filter is recommended (see Fig. 55) during
the cleaning process. Filter side flow rate should be
enough to filter the entire water volume every 3 to 4
hours. Change filters as often as necessary during the
cleaning process.
d. Remove temporary bypass when cleaning is complete.
A suction guide with an internal strainer is standard on all 30XA
units with factory-installed hydronic packages. This strainer al-
lows removal of particulates from the chilled water loop. Using
the combination valve and the field-installed isolation valve at the
inlet, the strainer can be isolated from the chilled water loop to be
cleaned.
Carrier’s ComfortLink controls provided have a built-in feature to
remind building owners or operators to clean the strainer at a pre-
set time interval. Properly installed, cleaned and maintained sys-
tems will rarely need the strainer cleaned after the initial fill. This
time interval is user-configurable.
Ideally, the chilled water loop will be cleaned before the unit is
connected. If the run-in screen is left in the suction guide/strainer,
it is recommended that the Service Maintenance be set to alert the
operator within 24 hours of start-up to be sure that the run-in
screen in the suction guide/strainer is removed after 24 hours of
operation.
NOTE: The suction guide/strainer must be removed after the first
24 hours of operation.
To set the time for the parameter, go to Time Clock
MCFG
W.FIL in the handheld Navigator™ display. To set the time for the
parameter with the Touch Pilot™ display, go to Main Menu
Service
MAINTCFG
wfilter_c. Values for this item are input
in days.
WATER TREATMENT
Fill the fluid loop with water (or brine) and a corrosion-resistant
inhibitor suitable for the water of the area. Consult the local water
treatment specialist for characteristics of system water and a rec-
ommended inhibitor for the cooler fluid loop.
Untreated or improperly treated water may result in corrosion,
scaling, erosion, or algae. The services of a qualified water treat-
ment specialist should be obtained to develop and monitor a treat-
ment program.
IMPORTANT: Before starting unit, be sure all of the air
has been purged from the system.
WARNING
In low ambient (below 32 F [0° C]) and/or low leaving fluid
temperature applications (below 40 F [4.4° C]), a suitable anti-
freeze solution of the proper concentration for the specific op-
erating conditions must be used as the fluid circulated through
the cooler to prevent freezing and damage to the system. Fail-
ure to operate the system with an antifreeze solution of the
proper concentration will impair or otherwise negatively affect
the warranty should damage result from freezing.
CAUTION
Water must be within design flow limits, clean, and treated to
ensure proper chiller performance and reduce the potential of
tube damage due to corrosion, scaling, erosion, and algae. Car-
rier assumes no responsibility for chiller damage resulting
from untreated or improperly treated water.
x
x
DILUTED
CLEANING
AGENT
SYSTEM
POT FEEDER AND
TRANSFER PUMP
30XA UNIT
TEMPORARY
BYP
ASS
TEMPORARY
PUMP
TO DRAIN
Fig. 54 — Typical Set Up for Cleaning Process
a30-4411
x
x
DILUTED
CLEANING
AGENT
SYSTEM
SIDE
STREAM
FILTER
POT FEEDER AND
TRANSFER PUMP
30XA UNIT
TEMPORARY
PUMP
TEMPORAR
Y
BYPASS
TO DRAIN
Fig. 55 — Cleaning Using a Side Stream Filter
a30-4412
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