Flooded Cooler Inspecting/Cleaning Heat Exhangers; Flooded Cooler Water Treatment; Dx Cooler Units; Dx Cooler Loss Of Fluid Flow Protection - Carrier AQUAFORCE 30XA080-500 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

1. Install all bolts finger tight.
2. Bolt tightening sequence is outlined in Fig. 53. Follow
the numbering or lettering sequence so that pressure is
evenly applied to O-ring.
3. Apply torque in one-third steps until required torque is
reached. Load all bolts to each one-third step before pro-
ceeding to next one-third step.
4. No less than one hour later, retighten all bolts to required
torque values.
5. After refrigerant is restored to system, check for refriger-
ant leaks using recommended industry practices.
6. Replace cooler insulation.
10
6
13
3
1
16
8
12
Fig. 53 — Flooded Cooler Unit Head
Recommended Bolt Torque Sequence
FLOODED COOLER INSPECTING/CLEANING HEAT
EXCHANGERS — Inspect and clean cooler tubes at the end
of the first operating season. Because these tubes have internal
ridges, a rotary-type tube cleaning system is necessary to fully
clean the tubes. Tube condition in the cooler will determine the
scheduled frequency for cleaning, and will indicate whether
water treatment is adequate in the chilled water/brine circuit.
Inspect the entering and leaving water thermistor wells for
signs of corrosion or scale. Replace the well if corroded or re-
move any scale if found.
CAUTION
Hard scale may require chemical treatment for its preven-
tion or removal. Consult a water treatment specialist for
proper treatment procedures.
FLOODED COOLER WATER TREATMENT — Untreat-
ed or improperly treated water may result in corrosion, scaling,
erosion or algae. The services of a qualified water treatment
specialist should be obtained to develop and monitor a treat-
ment program.
CAUTION
Water must be within design flow limits, clean and treated
to ensure proper machine performance and reduce the
potential of tubing damage due to corrosion, scaling, and
algae. Carrier assumes no responsibility for cooler damage
resulting from untreated or improperly treated water.

DX Cooler Units

DX COOLER SUCTION SERVICE VALVE — The suction
service valve is a factory-installed option for 30XA units. It is
SINGLE
9
PASS
ONLY
5
15
2
4
14
7
11
a30-4246
located in the suction line for each circuit. The suction service
valve is either a ball valve type valve or a butterfly type valve.
DX COOLER FREEZE PROTECTION — Coolers can be
ordered with heaters installed in the factory. If equipped, the
main base board based on the outdoor-air temperature and the
entering and leaving water thermistors controls the cooler heat-
ers. The Heater Set Point is the sum of the freeze point and
Cooler Heater DT Setp (Configuration
If the entering or leaving water temperature is less than the
Heater Set Point and the outdoor air temperature is less than
the Heater Set Point – 2° F (1.1° C), then the heater will be
turned on.
If the Entering or Leaving Water Temperature is less than
the Brine Freeze Setpoint (Configuration
1.0° F (0.5° C), then the heater will be turned on along with the
pump.
Entire cooler is covered with closed-cell insulation applied
over the heater. Heater plus insulation protect cooler against
low ambient temperature freeze-up to –20 F (–28 C).
IMPORTANT: If unit is installed in an area where
ambient temperatures fall below 32 F (0° C), it is rec-
ommended that a suitable corrosion-inhibited anti-
freeze solution be used in chilled water circuit.
DX COOLER LIQUID FLUID TEMPERATURE — Main
Base Board is programmed to shut chiller down if leaving fluid
temperature drops below 34 F (1.1 C) for cooler fluid type wa-
ter or below Brine Freeze Setpoint (Brine Freeze Setpoint,
LOSP) for cooler fluid type brine. The unit will shut down
without a pumpout. When fluid temperature rises to 6 F (3.3 C)
above the leaving fluid set point, safety resets and chiller re-
starts. Reset to automatic as long as this is the first occurance.
DX COOLER LOSS OF FLUID FLOW PROTEC-
TION — All 30XA machines include an integral flow switch
that protects the cooler against loss of cooler flow.
DX COOLER TUBE PLUGGING — A leaky tube can be
plugged until retubing can be done. The number of tubes
plugged determines how soon the cooler must be retubed. If
several tubes require plugging, check with a local Carrier rep-
resentative to find out how the number and location of tubes
can affect unit capacity. Fig. 54 shows an Elliott tube plug and
a cross-sectional view of a plug in place. See Tables 54 and 55
for plug components.
Use extreme care when installing plugs to prevent damage
to the tube sheet section between the holes.
Table 54 — DX Cooler Unit Plug Component Part
COMPONENTS FOR PLUGGING
For Tubes
Brass Pin
Brass Ring
For Holes without tubes
Brass Pin
Brass Ring
Loctite
Locquic
*Order directly from Elliot Tube Company, Dayton, OH or RCD.
†Can be obtained locally.
82
 
SERV HTR).
 
SERV LOSP) +
CAUTION
Numbers
PART NUMBER
853103-312*
853002-322*
853103-375
853002-377
No. 675 †
"N" †