Armstrong ABX BR AZED PL ATE HEAT EXCHANGERS User manual

WARNING: BEFORE PROCEEDING WITH
INSTALLATION AND OPERATION, READ ENTIRE
MANUAL CAREFULLY. FAILURE TO DO SO CAN
CAUSE INJURY OR PROPERTY DAMAGE
1. working principle
Armstrong’s Brazed Plate Heat Exchanger (abx) consists of
chevron plates of acid-resistant stainless steel. Every other
plate is reversed so the ridges of the herringbone pattern
intersect one another on adjacent plates forming a lattice
on contact points. When these points are vacuum brazed
together, two separate systems of channels for two media flow
in counter-current are formed. The lattice structure causes
vigorous turbulence, thus ensuring maximum heat transfer.
The abx is a highly ecient, corrosion-resistant, and pressure
resistant heat exchanger. The standard abx is designed to
meet 435 psi (30 bar), 392°f (200°c), with the largest model
capable of handling a maximum flow capacity of 600 gallons/
min (42 liter/sec).
warning: The Heat Exchanger may have sharp edges.
Exercise caution when handling
2. connection types
warning: During operation do not exceed maximum pressure
and temperature limits shown on the nameplate. Failure to do
so can cause injury or property damage.
The temperature of the brazing or welding process must not
exceed the melting point of the internal brazing material. Use
a wet towel around the connection and the late pack to reduce
the amount of heat transmitted to the pack during installation.
1 Clean the soldering assembly surface at the copper pipe and
heat exchanger connections. Remove oil or other buildup
with a degreasing agent. Polish the surfaces to remove
oxide.
2 Apply the flux to the surface with a brush to remove and
revent oxidation.
3 For refrigerant applications, use dry nitrogen gas on the
refrigerant side.
4 Heat the soldering area to the soldering temperature, about
649°c (1,200°f).Temperatures above this can melt the
brazing materials and result in damage.
5 Keep the pipe in a fixed position and apply the filler material
3. installation guide
In order to achieve high thermal eciency and high heat
transfer rates, abx has to be installed in a counter flow
direction.
Always install your abx vertically especially for a refrigerant
system. This is done to secure the abx and keep minimum
amount of water below the connector.
File No: 113.82
Date: july 15, 2020
Supersedes: 113.82
Date: october 28, 2011
ABX BRAZED PLATE HEAT EXCHANGERS
|
INSTALLATION AND OPERATING INSTRUCTIONS
threaded connections soldered connections

installation &
operating instructions
abx Brazed
Plate Heat Exchangers
2
4. connection location
Application fluid 1 fluid 2
Heating, Cooling cold water
a2a1
hot water
b1b2
Evaporator
single refrigerant
refrigerant
a2a1
chiller water
b1b2
Condenser refrigerant
a1a2
cooling water
b2b1
5. mounting suggestions
There are four dierent ways to mount the abx:
a Bottom support
b Sheet metal bracket,
c Crossbar& bolts,
d Stud bolts
• All items should be supported independently.
• Do not apply excessive forces to the fittings.
• Except for small sized abx030 model, our abx cannot be
fastened directly to the fittings/piping.
• Use flexible hoses or vibration dampers to reduce pulsation,
shock or vibrations that are caused by the operating system.
6. operating instructions
Start-Up Venting: During the filling process the unit must be
vented to eliminate any trapped air. This will assure proper
performance and longevity of the unit.
Shut Down: The two sides should be shut down simultaneously
and slowly. If this is not possible the hot side should be shut
down first. If the unit is shut down for an extended period of
time, it must be drained and cleaned. This is especially true
if there is a risk of frost or in the presence of any aggressive
medium inside the heat exchanger
7. anti-freezing protection
methods for bphe:
Any formation of freezing or icing will damage bphe and the
refrigeration system. The following methods will prevent bphe
evaporation from freezing:
• Use brine (e.g. glycol) when evaporation temperature is
close to the freezing point.
• Low working pressure will cause low evaporation
temperature. If the evaporation temperature is below 32°f
(0°c), it will cause water to freeze. Since the bottom portion
has the lowest temperature, it is the most likely spot for the
abx to crack.
• To start the refrigeration system, always start the water
pump for a few minutes and then start the compressor. To
stop the system, always stop the compressor first and then
stop the water pump.
1 Low Pressure Cut-o Switch (LP)
A low-pressure cut-o switch should be installed with
properly set values. When the actual evaporation pressure
is lower than the setting value, the compressor
will be cut o automatically.
2 Low temperature thermostat (LT)
The function of thermostat is to prevent evaporation
temperature going under 0°c. If evaporation temperature
is always above 0°c, then water has no chance to freeze
and expand
3 Water temperature sensor Installation of anti-freeze
temperature sensor neat the water outlet is another
method to prevent the water from freezing. The suggested
setting temperature is at 4°c for buering process
4 Water Flow Switch Installation of a water flow switch in
the water circuit can prevent possible abx freezing up due
to low water flow rate. Usually, low water flow rate may be
caused by malfunction of water pump, leaking Pipes, pipe
blockage due to pipe contamination or dirty filter.
ab
cd
a1 b1
b2a2
d1 c1
c2d2

installation &
operating instructions
abx Brazed
Plate Heat Exchangers
3
8. fouling and cleaning
Dierent factors may eect fouling such as fluid velocity,
turbulence, flow distribution, surface finish and water quality.
Proper maintenance and adequate water treatment can help
reduce fouling. Properly sized strainers should be installed
when particles are known to exist (strainers with a mesh size of
16-20 will retain particles over 0.04”). In installations where
high calcium hardness or fluid contamination is expected, the
heat exchanger should be cleaned periodically by flushing,
back-flushing and cleaning of the strainers. Two types of fouling
are described below:
Scaling Deposits of calcium on the heat transfer surface.
Deposits increase with temperatures higher than 60°c (140°f),
Calcium content and pH. Maintaining a turbulent flow and
lower temperatures can help reduce this type of scaling.
Particles Solids in suspension in the heat transfer media.
Fouling is influenced by flow rate and velocity, as well as by the
physical size of the particles
Cleaning of fouled plate heat exchanger by back flushing
will remove most of the soft debris that is blocked inside.
The solution used for back flushing shall be weak acids with
concentration less than 5%; one example is citric acid. If the
acidity is to high, the copper and stainless steel inside the phe
may be etched or corroded. Before Restarting the system, flush
the plate heat exchanger With large amounts of fresh water to
purge any Remaining acid solution.
9. warnings
• Explosive, flammable, corrosive, toxic and/or hazardous
fluids shall not be used in an abx.
• When an unknown quality of water is applied to the abx,
filter and strainer should with a 20 mesh sized shall be
placed at the water inlet to the abx.
• Highly chlorinated water and seawater can corrode
standard stainless steel plates and copper.
• Solution in the abx shall have a pH range between 6and 8.
• Ground water with high sulfuric compound and low pH
value may cause gradual damage to the copper braze
• When handling the abx be aware that exposed metal edges
May be sharp and suitable gloves should be warn.
Storage in dry and heated conditions warehouse between 1°c
to 50°c.
warranty
Standard Armstrong Warranty applies

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