Borg & Overstrom B4.2 User manual

A range of compact water dispensers, available in the following operational types:
• Direct Chill Chilled & Ambient (Low-Pressure Tank System)
• Direct Chill Chilled, Ambient & Hot (Low-Pressure Tank System)
• Direct Chill Chilled & Ambient
• Direct Chill Chilled, Ambient & Hot
• Direct Chill Chilled, Ambient & Sparkling
• Direct Chill Chilled, Hot & Sparkling
The B4 model is available as a countertop with a matching base cabinet in three colours.
Release date 08.02.2022
B4.2 Install & Operation
Manual
Introduction
Model Overview

All Models
All models are self-contained machines with robust
steel framed cabinets and attractively injection
moulded plastic front, side and top panels. An IEC
Power Lead is supplied for connection to the IEC
socket located at the rear of all models (An
additional Schuko type is supplied for the
European market).
Chilled
Water is fed into the insulated cold tank under
mains pressure. We strongly recommend a
Pressure Reducing Valve is fitted to all supplies to
regulate the pressure to 3.5 bar/355 KPat. The
cold tank is chilled via the evaporation coil of the
capillary controlled refrigeration compression
system. The cold temperature is thermostatically
controlled via the adjustment screw on the cold
thermostat. This is factory set and it is not
necessary to adjust in most cases (see Controls).
Ambient
Water bypasses the cold tank for the ambient
dispense.
Sparkling
Water is chilled as it passes through the Direct
Chill coil. It is pumped under pressure into the
carbonator which is fitted within the Direct Chill
coil. The carbonator is also level controlled. The
Deep Sparkle effect occurs through saturation with
CO2.
All models also incorporate a leak detection
device within the unit which disables the dispense
function until rectified.
Hot
Hot water is provided by a hot water tank with an
integrated heater element. The water is supplied
directly into the tank under the pressure as
connected into the back of the unit. The water fills
the tank and hot water is dispensed by
displacement. The water flow is controlled by a
solenoid.
Direct Chill
Borg & Overström Direct Chill utilises innovative
technology to chill water instantly. We recommend
this system for more demanding environments
because of its optimum dispense performance and
unrivalled hygienic qualities. Superior to the gravity
fed Reservoir system, Direct Chill technology chills
water on demand for the ultimate drinking
experience.
Before installation
Controls

This shows the correct and factory default set
point. Although adjustment is possible (clockwise
reduces the temperature and anti-clockwise
increases the
water temperature), this correct default setting is to
ensure optimum performance and reliability.
Unauthorised alternative settings could cause
technical issues and invalidate the warranty.
Chilled
Chilled On/Off Switch: at upper rear of machine,
switches cooling operation on/off.*
Cold Thermostat: at rear of machine.
Chilled Button: Press to dispense cold water.
Chilled LED: Indicates chilling application is
switched on.
10A Fuse: On rear of machine, integral with IEC
socket.
*All Direct Chill variants incorporate an auto-fill
system
Ambient
Ambient Button: Press to dispense ambient water.
Sparkling
Carbonation On/Off switch: Switches sparkling
operation on/off.
Sparkling Button: Press to dispense sparkling water.
Sparkling LED: Indicates sparkling application is
switched on.
Hot
Hot On/Off Switch: The hot water heating mode
is controlled by a switch on the back of the unit,
next to the cooling mode switch.
Hot Thermostat: regulated by a pre-set, non-
adjustable sensor on the tank.
Hot Button (incorporates safety lock): Press once to
unlock. Press again to dispense hot water. (Note:
Machine will revert to locked after 5 seconds if
dispense is not activated.)
Hot LED: Indicates hot application is switched on.
Cold Thermostat
Floorstanding Version

All models are designed to fit straight onto the top
of the base cabinet to create a floorstanding
model.
Ensure the feet are in the nesting positions.
The Door Panel is hinged and fastened with
Magnetic Catches. The cabinet can be levelled
using the adjustable feet. Service entry is at the
back of the machine.
Every Base Cabinet is supplied with a Level Sensor
Kit, comprising of:
A water container.
Sensor unit (c/w 2 no. CR3032 batteries).
(Requires some assembly – see Operation
Drip Tray with Drainage Outlet.
Interconnection kit between unit and cabinet –
see Base Unit Exploded Diagram
1

Major Components
Water and CO2 Connection
Level Sensor Assembly
Installation

Check all parts are present. Unscrew lid. Fit both batteries and refit lid.
Exchange the drip tray. Connect the drainage tubing
that is pre-fitted down the front
left hand side of the cabinet.
Level sensor positioned in
container.
NOTE: A WARNING TONE WILL SOUND WHEN THE WATER RISES (3 BEEPS EVERY
15 SECONDS REPEATED). UPON EMPTYING THE CONTAINER THE WARNING TONE
WILL STOP. CONTINUAL BEEP INDICATES LOW BATTERY POWER.

NOTE: Water supply to the product must be within 1.5 – 3.5 bar.
If the product is installed where the mains water pressure is greater than 3.5 bar then a pressure regulating
valve must be installed prior to the water inlet bulkhead. If the product is installed where the mains water
pressure is less than 1.5 bar then a pressure boost pump must be installed prior to the water inlet
bulkhead.
Failure to comply with this will invalidate your warranty.
Connect and turn on the water
supply. Then connect the power
supply.
To avoid damage do not turn
on the cold or hot power
switches until water flows out of
the machine. (If applicable)
Press and hold the cold water
button until water comes out.
All hot & sparkling tanks must be
purged of air by holding the
corresponding button. Do not
switch the hot system on until
tank has been purged.
On sparkling models turn on the
carbonation switch on the back
of the unit.
The relevant indicator lights will
be lit.
Water Connection & Operation
Operation

Flush through 5 litres of clean
water through each water
option immediately after
installing and before use.
When the cold water switch is
turned on, the cold water
indicator will be lit.
The temperature of cold water
can be set from 4c to 11c.
Allow up to 1 hour for the water
to reach its minimum
temperature.
Attach the regulator to the
disposable CO2 bottle,
ensuring the regulator is closed.
Connect the assembled CO2
bottle and regulator to the
machine using 1/4 inch pipe.
After completing the water
installation, turn on the sparkling
power switch and the pump will
run. Do not open the regulator
valve until the carbonated
switch has been turned on.
CO2 Bottle Installation (Sparkling Versions Only)
IMPORTANT! ALWAYS ENSURE SECURITY CLIPS ARE USED ON ALL WATER AND CO2
CONNECTIONS.

We recommend between 3.5 –
4 bar. Do not exceed 4 bar
pressure.
Flush through approximately 10
litres of sparkling water. Check
and adjust the CO2 pressure
accordingly.
Following installation, it will be
necessary to leave the machine
for up to 1 hour for the initial
chilling cycle to occur.
Functions & Controls
General Safety

Leave a space no less than 15cm between the wall and dispenser.
When combined with base cabinet – use wall bracket kit for high traffic areas.
Keep the machine away from sunlight, heat and moisture.

Please make sure the machine is completely
disconnected from the electrical supply before
carrying out any maintenance work.
Turn off the water supply.
Isolation & Removal
Maintenance

To drain the Direct Chill tank, remove the caps on the back of the machine. We recommend they are
refitted immediately upon draining being completed.
Borg & Overström’s recommended sanitisation schedule is a minimum of 6 months for a filter change and
internal water pathway sanitisation using Sterizen® 30 Internal Water Cooler Sanitiser (Order code:
461025) and a minimum weekly for external
cleaning, using Sterizen® Virus Killer Surface Sanitiser (Order code: 500033).
NOTE: Failure to use sanitising products and processes approved by Borg & Overström will invalidate
your warranty. Before beginning the sanitation process please ensure that water is turned off at the mains
and refer to the sanitisation liquid MSDS documentation for further information. Use Sterizen® hand gel
and ensure gloves are worn.
Sanitisation Guide

Briefly press cold/ambient
dispense buttons to release
internal water pressure from the
machine.
Remove the existing cartridge. Add 25 ml of Sterizen® 30
Internal Water Cooler Sanitiser
fluid to a clean and empty
service filter cartridge.
Connect the service cartridge to
machine.
Turn on incoming water, allow
service cartridge/doser to fill.
Dispense approx. 500ml water
using the cold button. Repeat
with sparkling button if present.
Briefly press the ambient button
too.

Leave the solution inside
machine for sanitisation
(minimum 5 minutes) while
thoroughly cleaning the machine
externally, pay particular
attention to the dispense faucet
and buttons.
If a Waste Overflow System is
fitted, empty this and flush
through with a small amount
of sanitisation fluid if needed.
Remember to include the drip
tray and connecting pipe work.
When the external cleaning
(after a minimum of 5 minutes) is
completed, flush 10 litres of
water through the machine using
the cold, sparkling and ambient
buttons.
Turn off water and remove the
service filter. Retain service filter
for reuse.
Fit new filter. Turn on incoming
water supply.
Pre-flush the new filter to waste
using the ambient button (and
sparkling button if present) until
the water appears clear and is
free of air. Flush through a small
amount of water to check all
functions.

Please note that this
sanitisation fluid
contains an active
caustic/alkaline agent.
Avoid skin contact and
wear protective gloves
when handling
sanitisation fluids.
Always use responsibly
and with care
remembering that due
to its alkaline nature
unnecessary
concentrated/prolonge
d contact with any
materials, including
metals, can cause
damage. Always rinse
all contact surfaces
after use with clean
water.
In the event of any skin
contact, flush
immediately with
clean, cold water.
NOTE: If this machine is equipped with a leak detection device. When leaking is detected the dispense
operation will be cut off automatically.
To reset:
Unplug the machine. Locate the source of leakage
and rectify.
Locate the detection probe
which can be found in the
bottom rear left hand corner. Dry
the probes and internal area
with a dry cloth.
Leak Detection (power cut-off) - All variants. Enhanced Leak Detection (Flood
Prevention) Availiable as Optional Extra.

If enhanced Leak Detector is
fitted as optional extra: locate
the Leak Detector valve.
Reset the red lever (push it in). Reconnect the power to
machine and test operation.
If leak detector is fitted as optional extra, reset the red lever (push it in)
Switch off the Carbonation System switch on the
back of the unit.
Press and hold the Sparkling water dispense button
until all water is expelled.
Emptying the Carbonation Tank for Transportation

The tank is empty of sparking water when only
CO2 is being released.
Ensure to release the Sparkling water button and
take care to avoid releasing excess amounts of
CO2 gas.

Fault Diagnosis: No Water Dispenses
Problem/Report Possible Cause Suggested Action
From Ambient
Dispense
Water Supply turned off. Check all that taps/valves/ filters
on the incoming supply are fitted
and are turned on.
“Waterblock” tripped off
(and tank
empty).
Reset “Waterblock” (and check for
any leaks).
“Leak detector” (if fitted)
tripped off
(and tank empty).
Disconnect the power and water
supply, reset the machine (check
for leaks).
Solenoid not working. Dismantle and check the solenoid,
completely replacing the solenoid as necessary.
No Electricity/Power
Supply.
Check power cord is
connected and live. Check machine is switched
on.
Blocked tank outlets/pipes. Check and unblock or replace as needed.
Control PCB not working. Check/replace Control PCB.
From Cold
Dispense
Firstly all as for Ambient
Dispense.
Carry out checks and actions as for
ambient dispense.
Chiller tank frozen –
Thermostat set
too low.
Thaw out the machine and increase cold water
temperature.
Chiller tank Frozen -
Thermostat not
working.
Thaw out the machine and check
thermostat. Replace Cold Water thermostat as
needed.
Chiller tank frozen. Circulation pump not working /
Thaw out the machine and check
circulation pump. Replace circulation pump as
needed.
Problem/Report Possible Cause Suggested Action
Advanced Troubleshooting

Problem/Report Possible Cause Suggested Action
From Hot
Dispense
Firstly all as for Ambient
Dispense.
Carry out checks and actions as for ambient
dispense.
Airlock in dispense pipe work. Unblock/replace hot water pipe and hot vent pipe.
Tank filled with limescale. Replace tank.
From Sparkling
Valve
Firstly as for ambient and cold
valve.
Carry out the checks and actions as for cold and
ambient.
Low or no CO2. Check and replace cylinder as necessary.
Pump not operating. Check carbonator level control system.
Check probes connected/Leads attached. Check
power supply to pump.
Carbonator Tank over
pressurised with CO2.
1. Switch the Sparkling System off.
2. Shut off CO2 supply.
3. Press the Sparkling Water button to release
CO2 from carbonator.
4. Switch the Sparkling system on.
5. Check pump operation is
running normally.
6. Wait for the pump to stop running.
7. Re-open CO2 supply.
Pump Feed Solenoid Valve. Check function/condition and repair/replace
accordingly.
Carbonation System switched
off.
Switch on (Switch on back of the machine).
Fault Diagnosis: Water Dispenses but not Correct Temperature
Problem/Report Possible Cause Suggested Action
Ambient Water
too Warm
Low usage and/or heat from compressor
influencing stored
water.
Check tank insulation and/or
advise customer.
High usage and/or water supply pipe in warm
ducting.
Advise customer.
Cold Water not
Cold
Cooling switched off. Check switch positions as
necessary.

Problem/Report Possible Cause Suggested Action
Compressor runs and switching off
(cool/warm to touch) - Thermostat
set too high.
Decrease cold thermostat set
point.
Thermostat not working. Check/replace thermostat.
Compressor runs but not switching off (hot to
touch).
Please contact technical support.
Refrigeration problem. Please contact technical support.
Compressor not running at all - No
electricity power supply.
Check the Power cord is
connected
and live, and the machine is
switched on.
Compressor only hums slightly/ briefly. Check and replace relays.
Relays loose. Check and refit relays.
Compressor not working. Please contact technical support.
Fan not working. Check and replace, as required.
Hot Water not
Hot
Hot water mode switched off. Switch on hot water mode (status
LED should show).
Heating operation tripped off. Reset overheat button on hot
tank.
Break in supply wiring to control circuit. Locate break and repair.
Hot water demand too high. Advise user/s.
Heating element not working. Check and replace Hot tank as
required.
Hot tank heavily scaled (signs of scale in top of
tank, loud boiling noises etc).
Carry out thorough descale or
replace hot tank.
Break in supply wiring to main element. Locate break and repair.
Fault Diagnosis: Water Leaks
Problem/Report Possible Cause Suggested Action