Armstrong 3750 User manual

3750 Pulpress
Pressurisation
unit
Installation and
operating instructions
File No: 37.856iec
Date: may 19, 2020
Supersedes: 37.856iec
Date: november 28, 2019

contents
1.0 ce conformities 4
2.0 preface 4
3.0 introduction 4
4.0 warning symbols 4
5.0 safety instruction 4
6.0 range definition 4
7.0 typical chilled water sealed system 5
8.0 typical lthw sealed system- max. 100°c 5
9.0 typical mthw sealed system max. 120°c 6
10.0 storage 6
11.0 features 6
12.0 protection 6
13.0 general notes 6
14.0 installation 6
14.1 mechanical 6
14.2 electrical 7
15.0 safety regulations 7
16.0 commissioning 7
17.0 operation 7
18.0 heating system 7
19.0 chiller systems 7
20.0 controller functions 8
21.0 functional display 8
21.1 operation screens 9
21.1.1 main screen 9
21.1.2 test screen 9
21.1.3 system overview 9
21.1.4 pump control screen 10
diagnostics 10
21.1.5 support information 10
21.1.6 system information 10
alarms 11
21.1.7 alarm screen 11
21.1.8 alarm log screen 11
21.2 setup screens 11
21.2.1 login 11
21.2.2 pump setup – 1 11
21.2.3 pump setup – 2 12
21.2.4 pump setup – 2 (twin system only) 12
21.2.5 pressure setup 12
21.2.6 pressure setup (twin system only) 13
21.2.7 bas communication 13
21.2.8 date/time change 13
21.2.9 password screen 14
21.2.10 valve setup (twin system only) 14
22.0 parameters 14
23.0 warnings and alarms 16
23.1 break tank low/high water level 16
23.1.1 low water level 16
23.1.2 high water level 16
23.2 low system pressure 16
23.3 high system pressure 16
23.4 transducer failure 16
23.6 pump 2 tripped 17
23.7 all pumps tripped 17
23.8 pump run 17
23.8 maximum pump run time 17
23.9 excessive starts 17
23.10 boiler interlock 17
23.11 offline alarm _ cpcoe 18
24.0 alarm list 19
25.0 maintenance check 20
26.0 fault finding chart 21
26.1 pump(s) run continuously 21
26.2 pump(s) will not run 21
26.3 high pressure 21
26.4 low pressure 21
26.5 low water level 21
26.6 offline alarm _ cpcoe 21
Building Automation System (Single System) –
Modbus RTU 22
Building Automation System (Single System) –
BACnet MS/TP 23
Building Automation System (Twin System) –
Modbus RTU 24
Building Automation System (Twin System) –
BACnet MS/TP 25
Armstrong Pressurisation Unit Controllers are completely factory-assembled, tested and shipped to the job site as integral units ready to receive
incoming power supply. These instructions describe the procedures to be followed during installation, commissioning and operation to ensure
optimum performance and reliability

installation &
operating instructions
3750 Pulpress
Pressurisation unit
4
1.0 ce conformities
lvd bs en 61010-1
Low voltage switchgear bs en 61439-1
Safety of machinery bs en iso 12100
Safety of machinery bs en 60204-1
Electromagnetic compatibility
Harmonic emissions bs en 61000-3-2
Electrostatic discharge bs en 61000-4-2
Radiated rf immunity bs en 61000-4-3
Fast transient bursts bs en 61000-4-4
Voltage surges bs en 61000-4-5
Conducted rf immunity bs en 61000-4-6
Voltage dips bs en 61000-4-11
Generic immunity bs en 61000-6-1
Generic immunity bs en 61000-6-2
Generic emissions bs en 61000-6-3
Generic emissions bs en 61000-6-4
Safety of stationary circulation bs en 60335-2-51
pumps for heating and service
water installation.
2.0 preface
1 The 3750 Pulpress pressurisation unit has been designed
for ease of setting and operation.
2 All packaged pump systems are pre-wired and fully tested
prior to dispatch.
3 If ordered with system criteria, all parameter data has
been entered into the controller in accordingly. Once
on-site connections have been made, and all pre-checks
carried out, the system is ready for commissioning.
4 During commissioning if system conditions are found to
vary from those set out in the design criteria, the parame-
ters can be easily changed.
3.0 introduction
1 This installation and operation manual contains specific
information regarding safe installation, operation and
maintenance of the 3750 Pulpress pressurisation unit.
These instructions must be read and understood by
anyone responsible for the installation and maintenance
of this equipment.
2 Prior to connect the unit to the power supply, it is
essential that all Pre-commissioning procedures are
carried out in full.
3 Operators and installers must familiarise themselves with
the operation and controls of the equipment.
4.0 warning symbols
Safety instruction where an electrical hazard is
involved.
Safety instruction where non-compliance would
aect safety.
Safety instruction relating to safe operation of the
equipment. (Attention)
5.0 safety instruction
1 This equipment has been designed for the pressurisation
of sealed heating, chilled water and closed condenser
water systems to the operating conditions shown.
2 This equipment should not be installed until operation and
maintenance instructions has been studied and under-
stood by the person(s) responsible.
3 Handling, transportation and installation of this equip-
ment shall only be undertaken with the use of appropriate
lifting gear.
4 The set shall not be used for any purpose other than that
for which it was designed and sized.
5 The set shall not be operated with the cover removed and
the cover interlocked isolator overridden.
note
During normal operation, the pumps will only gen-
erate pressures sucient to satisfy system demand.
However, abnormal running conditions may cause
closed valve pressures to be experienced.
6.0 range definition
system(s) pump(s) pressure range
1 1 Low
Med
High
2Low
Med
High
2 1 Low
Med
High
2Low
Med
High
Low Pressure = 0.5-2.7 bar
Med Pressure = 0.5-5.5 bar
High Pressure = 0.5-8.0 bar

installation &
operating instructions
3750 Pulpress
Pressurisation unit
5
7.0 typical chilled water sealed system
expansion vessels
electrical safety interlock
isolating valve drain cock lock shield valve
non-return valve
return
condenser
evaporator
pump
pump
chillier unit
flow
elecrical supply
3750 pulpress
signals to bms
cooling load
air eliminator
see leaflet on air eliminators
alternative
position
to cooling
tower
chillier
controls
mains
supply
test
point
system fill
connection
equipment within
this area is
supplied by others
8.0 typical lthw sealed system- max. 100°c
air eliminator
see leaflet on air eliminators elecrical supply
expansion vessels
return
flow
heating load
temperature
gauge pressure
gauge
alternative
position
boiler
controls
over temperature
energy cutout
boiler
thermos
tat
auto-air
vent with
on-o clock
anti-
gravity
loop
safety
valve
signals to bms
3750 pulpress
electrical safety interlock
isolating valve drain cock lock shield valve
non-return valve
equipment within
this area is
supplied by others
mains
supply
test
point
system fill
connection
pump
pump

installation &
operating instructions
3750 Pulpress
Pressurisation unit
6
9.0 typical mthw sealed system max. 120°c
The arrangement of the mthw scheme is similar to the lthw
system above but has, in addition, an intermediate vessel
installed between the expansion vessels and the system con-
nection. The volume of water contained in this vessel ensures
that the return temperatures at the boiler are not transferred
to the expansion vessel, where damage to the diaphragm
would otherwise occur.
warning notes
1 Pressure vessels are supplied as loose items with the
pre-charge pressure of 4bar. If the unit is not being
commissioned by Armstrong please make sure the vessel
is charged to the correct pressure.
2 Packed-gland circulating pumps must not be used in
sealed systems.
3 Water treatment must not be added to the system via the
3750 Pulpress break tank.
4 No part of the set, expansion vessel, intermediate vessel
or connecting pipe is to be lagged.
5 Precautions should be taken to ensure that Lock Shield
Valves are protected against unauthorized closure.
6 In any case, the 3750 pressurisation unit should not be
used to fill up an empty system.
10.0 storage
Store in a dry place. Protect against dirt, damage and frost.
11.0 features
1 Maximum system working pressure: 10 bar.
2 Maximum flow temperature: 120°c.
3 Electrical supplies: 1phase, 50 or 60 Hz, 240 volts.
4 Power supply fluctuation: ±10% maximum.
5 Humidity non-condensing: 80% rh up to 31°c decreas-
ing linearly to 50% rh at 40°c.
6 Ambient temperature: +5°c to +40°c.
7 Water supply pressure: 0.8 bar minimum to 6.8 bar
maximum with ballcock fully open.
8 Pump pressure range: 0.5 to 2.7 bar, 0.5 to 5.5 bar and
0.5 to 8.0 bar.
9 System fill pressure: System set point pressure, within
the pump pressure range
10 Maximum water temperature for expansion vessels:
a Continuous 70°c: Above this, intermediate vessels
must be used.
b Intermittent : 100°c
11 Maximum total boiler rating: Refer to graph
12 Break Tank: 21 litre active capacity and manufactured
from polyethylene complete with ball valve to bs 1212 part
2 with type ab air gap to comply with bs en 13076:2003,
wras and model water Bye-laws
12.0 protection
The set must be protected from the formation of condensa-
tion. If there is a likelihood of condensation forming on or in
the control panel then an anti-condensation heater (option
available to order) should be fitted. Contact our service de-
partment for details.
13.0 general notes
1 The sets comprise one or two pumps operating on a
duty/Stand-by arrangement.
2 Each set is sized to bs7074 and custom built for a specific
application, any change in the system conditions shown
may necessitate a change in the design or settings.
3 System must be completely flushed out prior to installing
the unit, to remove any metal particles, dirt etc., which
may damage the set.
4 The system should be pressure tested, to eliminate leaks.
5 Under no circumstances must any attempt be made to in-
troduce water treatment to the system via the break-tank.
6 No part of the set, connecting pipe or expansion vessel(s)
are to be lagged.
7 Fill the system via the quick-fill connection (Supplied by
others). Do not use the set to fill the system
14.0 installation
14.1 mechanical
1 Install the set on a flat and even surface.
2 Site set with sucient space to the front, left and right
sides of the unit for maintenance purposes.
3 Connect the cold water mains supply, via a stopcock, to
the ballcock in the break tank. (Water supply pressure 0.8
bar minimum with ballcock fully open).
4 Arrange break tank overflow pipe to discharge into a con-
venient drain in line with clause 30 of the Water supply
Bye-laws 1989 edition.
5 Make a connection from the set to the return side of the
boiler and suction side of the circulating pump(s). If inter-
mediate vessels are provided these should be fitted in this
connection with the set and expansion vessels connected
to the bottom of the vessel and the system to the top of
the vessel. A manual air vent should be fitted in the pipe
work close to the top of the vessel, see general arrange-
ment drawing provided. Ensure pump(s) are vented by
loosening the vent cap on top of the delivery branch of the
pump. Care must be taken not to over tighten the system
or water inlet connections.

installation &
operating instructions
3750 Pulpress
Pressurisation unit
7
6 Never dry run the pump.
7 For wall mounting, wall structure will need to be deter-
mined to select appropriate fasteners. Ensure there are no
pipes or electrical cables running behind where the wall
bracket is to be secured.
14.2 electrical
1 The power supply required is 240 volt ±10%, 1phase, 50
Hz or 60 Hz to suit motors fitted.
2 The incoming supply should be connected to the door
interlocked isolator from a local 10 amp switched fused
spur and if possible an elcb unit.
3 All incoming cable glands should be ip54 rated as
a minimum.
4 Wire the set control systems (see enclosed wiring
diagram) from the volt free terminals to the boiler
control system.
5 Boiler/chiller interlock provided via normally open volt
free contact.
6 The set must be earthed.
attention
It is the user’s or certified electrician’s responsibility
to ensure correct earthling and protection in accord-
ance with applicable national and local requirements
and standards.
important safety information
1 The voltage on the 3750 Pulpress unit is dangerous when
it is connected to the mains. Incorrect installation of the
set may lead to material damage or serious injury or
death. Consequently, you must comply with the instruc-
tions in this manual as well as the local rules and
safety regulations.
2 Touching the electrical parts may be fatal, even after the
mains supply has been disconnected, wait at
least 4minutes.
3 The installation must be fused and isolated correctly.
4 Covers and cable glands must be fitted.
15.0 safety regulations
1 The 3750 Pulpress unit must be disconnected from the
mains if repair work is to be carried out. Check the mains
supply has been disconnected and the necessary time has
passed (4minutes).
2 The correct protective earthing of the equipment must be
established, the user must be protected against supply
voltage, and the set must be protected against overload in
accordance with applicable national and local regulations.
3 RCDs (elcb relays), multiple protective earthing or earth-
ing can be used as extra protection, provided that local
safety regulations are complied with.
16.0 commissioning
1 Fill the system with water via the quick fill connector. It
is essential that all air in the system is allowed to escape
freely through automatic air vents and radiator bleeds,
failure to remove air could result in a system malfunction.
2 Turn on the water supply feeding the 3750 Pulpress unit
and fill the break tank.
3 Check pumps are primed by loosening cap on the delivery
side of the pump–let water escape until no air is present,
put back caps and pressurize to the ambient temperature
set pressure. Never dry run the pumps.
4 With cover interlock isolating switch in the o position
switch on the power supply to the unit.
17.0 operation
Turn the main isolating switch to the On position. The system
pressure will be displayed on the digital readout. The unit will
automatically maintain pressure in the system as set out in
the design criteria and will only operate when the pressure
falls between the systems fill pressure and the pump cut-in
pressure. For twin system unit, both the system pressures
will be displayed on the digital readout. The unit will operate
on both the systems simultaneously.
18.0 heating system
Start the boiler(s). The water from the system will flow into
the vessel(s) and the system pressure will rise slowly and
settle at a pressure below the maximum pressure shown on
the nameplate. If the boiler safety valve lifts, check the valve
setting and the system details, against the ordering specifi-
cation for the 3750 Pressurisation unit.
19.0 chiller systems
When the chiller(s) are started the water contracts as it cools
and the expansion vessels will pass water to the system to
bring the pressure up to the ambient temperature setting
pressure. When the chiller is switched o the expanding wa-
ter will pass into the expansion vessel, the pressure will rise
and settle at a pressure below the maximum pressure shown
on the nameplate.

installation &
operating instructions
3750 Pulpress
Pressurisation unit
8
notes
On chiller sets, the highest system pressure will occur when
the system is at ambient temperature after operation, where-
as on heating sets the highest pressure occurs at maximum
system operating temperature.
If the system pressure falls due to a slow leak, water in the
expansion vessel(s) will run back into the systems.
If the system leakage continues causing a drop in pressure
below the initial system pressure the pump(s) will start to
restore the initial system pressure.
In the event of a leak exceeding the pump(s) capacity then,
providing the set's volt free contacts have been wired accord-
ingly, the boiler burners will be shut down and the circulating
pumps are stopped. The system should then be closed down
and the leak rectified.
21.0 functional display
The 3750 Controller displays are divided in two set of
screens: Operation and Setup. The operation screens are
used by the operators to monitor and control the operation.
The Setup Screens are used to set and view the system
specific settings (i.e. number of pumps, pressure settings,
sensor range, etc.)
21.1 operation screens
21.1.1 Main screen/Twin-system screen
21.1.2 Test screen
21.1.3 System overview
21.1.4 Pump control screen
Diagnostics
21.1.5 Support information
21.1.6 System information
Alarms
21.1.7 Alarm screen
21.1.8 Alarm log screen
21.2 setup screens
21.2.1 Login
21.2.2 Pump setup – 1
21.2.3 Pump setup – 2
21.2.4 Pump setup – 2 (Twin system only)
21.2.5 Pressure Setup
21.2.6 Pressure Setup (Twin system only)
21.2.7 bas communication
21.2.8 Date/Time change
21.2.9 Password screen
21.2.10 Valve setup (Twin system only)
Standard keys: work same in all screens
Navigates to Alarm and Log screens
Solid White when there are no active alarms
Flashing Red when Alarm is activated and On Buzzer.
Solid Red when all alarms are reset and still some active
alarms
Navigates to Main Menu display,in all screens.
When cursor is at top left corner of the screen pressing
up or down key navigates b/w screen
When cursor over digital value pressing up or down will
toggle the value
When cursor over analog value pressing up or down
will increase or decrease value
Pressing Enter key move cursor to next field within
display
Set the value changed by up/down keys and save the
respective value
20.0 controller functions

installation &
operating instructions
3750 Pulpress
Pressurisation unit
9
21.1 operation screens
21.1.1 main screen
description
This screen appears when powering up the unit. Show status
of system’s most important variables and navigation to all
system screens.
data
1 3750 Status Status Indicates whether system is on or
off.
2 Pump Run
Status
Indicates the pump number(s) which is/are
running.
Blank when no pumps running.
3 Sy Pr Indicates Actual system pressure
4 Active
Alarm
Indicates with text the active alarm with the
highest priority.
Blank when no active alarms
buttons
5 Local-
Remote
Navigator button that allows changing the
3750 to Remote or Local.
Local will turn on the system immediately.
Remote causes the 3750 to follow the bas
signal (Serial communication) to turn on
or off
6 Setup Navigates to Setup screen. Access to Setup
screens requires a password
7 Test Navigates to Test screen
21.1.2 test screen data
1 Test Mode
Navigator button that allows to Enable/
Disable the test mode. When user exit from
the screen, Test mode automatically get
disabled.
2 Pump status
(p1 & p2) Indicates the Pump Run/Stop Status.
3 Jog mode Navigator button that allows to on/off the
Pump (Momentary Operation).
timer mode
4 Time Allows User to Set Pump Runtime in seconds.
5 Command
Navigator button that allows to on/off the
Pump. The on State will be active until the
timer expires.
6 Sy Pr Indicates actual system pressure
1
2
3
4
5
6
7
32
1
4
5
6
7
21
6
5
4
3
twin-system screen
single-system screen
21.1.3 system overview description
This screen show the overview of system parameters
data
1 No of Pumps Indicates number is pumps configured
2 Actual Pr Indicates actual pressure from the probe
3 Cut Out Pr Indicates pressure at which pumps will stop
4 Cut in Pr Indicates the pump at which pump triggers
on
5 High Pr Indicates maximum pressure pump trip and
generating max Pr alarm
6 Low Pr Indicates minimum pressure for alarm
generation.
12
3
5
6
4

installation &
operating instructions
3750 Pulpress
Pressurisation unit
10
21.1.4 pump control screen description
This screen allows user to control Pump operations.
data
1 Pump (p-1, p-2)
Status
Indicates the Pump Run/Stop status
2 Duty / Standby
Indicates Duty/Standby status of Pump
if Pump is placed in Auto Mode
Blank in Hand or O mode
3 Run hr Indicates the total Pump running hours
4 System Pressure Indicates actual system pressure at the
Probe
buttons
5 Mode
Navigator button that allows changing
Pump Mode for Hand, o and Auto
Modes.
21.1.6 system information description
This screen show system information
data
1 Sys Config Indicates the number of pumps configured.
2 Board Type Indicates type of controller board used.
3 Board Size Indicates Size of controller board used.
4 CpCoe-1Indicates the expansion-1module status
(Online/Oine).
5 CpCoe-2(for
twin system
only)
Indicates the expansion-2module status
(Online/Oine).
diagnostics
21.1.5 support information
description
This screen show support information
data
1 E-mail id Displays email id for requesting a support
for 3750 unit or any other clarifications
2 Sw Ver Indicates current version of control soft-
ware installed into controller
3 OS Ver Indicates os installed into controller
4 Boot Ver Indicates boot version installed into
controller
1
3
4
5
1122
3
34
5
5
1
2
3
4
45
1 2
3

installation &
operating instructions
3750 Pulpress
Pressurisation unit
11
alarms
21.1.7 alarm screen
description
This screen allows user view and reset alarms
data
1 Alarms Alarms will be displayed based on priority
shown in alarm section below.
2 No Alarm Indicate there is no alarm
buttons
3 Alarm
Reset
Reset can be done pressing the alarm button
a single time to reset current alarm and long
press (3 sec) to reset all alarms at once.
4 Data
Logger
If no alarms are present, pressing the Enter
button will navigate to the data logger screen
1
2
3
21.1.8 alarm log screen description
This screen allows user view alarm logs
data
1 Alarm logs System can keep logs in this screen
2 No Logs Indicate there is no alarm log
buttons
3 Up and Down Keys Scrolls between recent alarm logs
1
2
21.2 setup screens
21.2.1 login
description
This screen allows user to login to access setting screens
buttons
1 Password
Allows user to enter the password. after
entering the correct password press enter
key its navigates to settings screens.
2 Wrong
Password
If user enter wrong password and press
Enter key, then system will be reset to
default 2300
3 Level-1
Password
2323 is the level-1 password.
Using this password operator can change
the basic parameters of the system
1
21.2.2 pump setup – 1 description
This screen allows user to access Pump Setup
data
1 Standby Pump If 1Pump selected, then standby pump
is no. If 2pump selected then standby
pump is yes
buttons
2 No. of Pumps Allows user to change number of pumps
based on system configuration.
1
2

installation &
operating instructions
3750 Pulpress
Pressurisation unit
12
21.2.3 pump setup – 2 description
This screen allows user to access extended Pump Setup
buttons
1 Ex. No. of Start Allows user to change excessive number
of starts in a desired amount of time.
2 Ex. Start (Min)
Allows user to change time in Min for
monitoring Ex. No. of starts in desired
time.
3 Max P Run
(Min)
Allows user to set max pump run time for
Auto Operation
4 Pulse Cycle
Start Time (Hr)
Allows user to set time to pulse Pump for
maintaining the healthiness of system.
5 Pulse Cycle
Time (Sec)
Allows user to Set time for which Pump
should run in Pulse cycle mode
21.2.4 pump setup – 2 (twin system only) description
This screen allows user to access Pump Setup
buttons
1 Max P Run
(MIN)
Allows user to set max pump run time for
Auto Operation.
2 Pulse Cycle
Start Time (Hr)
Allows user to set time to pulse Pump for
maintaining the healthiness of system.
3 Pulse Cycle
Time (Hr)
Allows user to Set time for which Pump
should run in Pulse cycle mode.
4 Dip Delay Allows user to set time for pump to mon-
itor pressure before starting.
1
2
3
5
4
21.2.5 pressure setup
description
This screen allows user to select pressure & sensor unit.
buttons
Pressure unit Allows user to navigate units between Bar,
PSI, KPa, m and ft.
Sensor unit Allows user to navigate units between Bar,
PSI, KPa, m and ft.
12
3
5
6
4
description
This screen allows user to access Pressure Setup
buttons
1 Cut Out Pr Allows user to change the Cut Out pressure
for the Pump to stop operating
2 Cut In Pr Allows user to change the Cut In at which
pump will start.
3 High Pr Allows user to set High Pressure limit for
Pump safety and generate alarm
4 Low Pr Allows user to set Low Pressure limit and to
generate alarm
5 Dip Delay Allows user to set time for pump to monitor
pressure before starting.
6 Sen Range Allows user to scale pressure sensor for
dierent ranges

installation &
operating instructions
3750 Pulpress
Pressurisation unit
13
21.2.6 pressure setup (twin system only) description
This screen allows user to access Pressure Setup
buttons
1 Ex.No of
Start
Allows user to change excessive number of
starts in a desired duration of time.
2 Ex.No of
Start (MIN)
Allows user to change time (in Min) for
monitoring Ex. No. of starts in desired time.
3 Cut Out Pr Allows user to change the Cut-Out pressure
for the Pump to stop operating.
4 Cut In Pr Allows user to change the Cut In at which
pump will start.
5 High Pr Allows user to set High Pressure limit for
Pump safety and generate alarm.
6 Low Pr Allows user to set Low Pressure limit and to
generate alarm.
7 Sen Range Allows user to scale pressure sensor for
dierent ranges.
21.2.7 bas communication description
This screen allows user to access bas communication Setup
buttons
1 Protocol Allows user to navigate between Modbus,
BACnet or No select (n/a)
2 Address Allows to change Address for Modbus and
BACnet
3 Baud Rate Allows user to Navigate baud Rate between
9600, 19200, 38400
4 Parity
Allows user to Navigate Parity between odd,
even and no. This is only for Modbus connec-
tion
5 Instance Allows user to Set BACnet Instance. This is only
for BACnet Connection
1
2
3
5
4
21.2.8 date/time change description
This screen allows user to access to change controller Date
and Time
buttons
1 Date Allows user to update Date to a con-
troller in format dd/mm/yy
2 Hour Allows user to update Hour to a con-
troller in format hh/mm/ss
3 Day Upon entering Date and Time system
will update the Day for that Date
4 Update Settings
Allows user to Navigate Parity between
odd, even and no. This is only for
Modbus connection
1
2
34

installation &
operating instructions
3750 Pulpress
Pressurisation unit
14
22.0 parameters
single system parameters
parameter default min max unit of measure
Number of Pumps 2 1 2 Numeric
Excessive No. of Start 15 199 Numeric
Excessive Start minutes 60 1720 Minutes
Maximum Pump Run time 15 1990 Minutes
Pulse Cycle Start Time (Hour) 720 18640 Hours
Pulse Cycle Time (Sec) 10 199 Seconds
Cut out Pressure 1 0 Pump COP High Limit Bar/PSI/Kpa/m/ft
Cut In Pressure 0.7 0Pump COP High Limit Bar/PSI/Kpa/m/ft
High Pressure Alarm 1.3 0Pressure Transducer High Range Bar/PSI/Kpa/m/ft
Low Pressure Alarm 0.3 0Pressure Transducer High Range Bar/PSI/Kpa/m/ft
Dip Delay 5 0 100 Seconds
Pressure Transducer Range 0-25(4-20mA) /
0-17(0-5V)09999 Bar/PSI/Kpa/m/ft
bas Protocol Modbus - - -
bas Address 2 1 127 Numeric
bas Baud Rate 19200 - - -
bas Modbus Parity NO - - -
bas BACnet Instance 77000 77000 77999 Numeric
note:
parameter bas protocol: n/a, Modbus or BACnet
parameter bas baud rate: 9600, 19200 or 38400
parameter bas modbus parity: no, odd or even
21.2.9 password screen data
Password
Protection
Allows user to Enable/Disable the
Password protection.
21.2.10 valve setup (twin system only) description
This screen allows user to access VALVE Setup
data
1 Valve 1 Indicates the Valve 1status.
2 Sys 1Pr Indicates the system 1pressure.
3 Sys 2Pr Indicates the system 2pressure.
buttons
4 mode Can command the Isolation Valve when
the pumps are not running.

installation &
operating instructions
3750 Pulpress
Pressurisation unit
15
twin system parameters
parameter default min max unit of measure
Number of Pumps 2 1 2 Numeric
System-1Excessive No. of Start 5 1 99 Numeric
System-1Excessive Start minutes 60 1720 Minutes
System-2Excessive No. of Start 5 1 99 Numeric
System-2Excessive Start minutes 60 1720 Minutes
Maximum Pump Run time 15 1990 Minutes
Pulse Cycle Start Time(Hour) 720 18640 Hours
Pulse Cycle Time(Sec) 10 199 Seconds
System-1Cut out Pressure 1 0 Pump COP High Limit Bar / PSI / Kpa / m / ft
System-1Cut In Pressure 0.7 0Pump COP High Limit Bar / PSI / Kpa / m / ft
System-1High Pressure Alarm 1.3 0Pressure Transducer High
Range Bar / PSI / Kpa / m / ft
System-1Low Pressure Alarm 0.3 0Pressure Transducer High
Range Bar / PSI / Kpa / m / ft
System-2Cut out Pressure 1 0 Pump COP High Limit Bar / PSI / Kpa / m / ft
System-2Cut In Pressure 0.7 0Pump COP High Limit Bar / PSI / Kpa / m / ft
System-2High Pressure Alarm 1.3 0Pressure Transducer High
Range Bar / PSI / Kpa / m / ft
System-2Low Pressure Alarm 0.3 0 Pressure Transducer High
Range Bar / PSI / Kpa / m / ft
Dip Delay 5 0 100 Seconds
System-1Pressure Transducer Range 0-25(4-20mA) /
0-17(0-5V)
0 9999 Bar / PSI / Kpa / m / ft
System-2Pressure Transducer Range 0-25(4-20mA) /
0-17(0-5V)
0 9999 Bar / PSI / Kpa / m / ft
bas Protocol N /A - - -
bas Address 1 1 127 Numeric
bas Baud Rate 19200 - - -
bas Modbus Parity NO - - -
bas BACnet Instance 77000 77000 77999 Numeric
note:
parameter bas protocol: n/a, Modbus or BACnet
parameter bas baud rate: 9600, 19200 or 38400
parameter bas modbus parity: no, odd or even

installation &
operating instructions
3750 Pulpress
Pressurisation unit
16
23.0 warnings and alarms
The 3750 constantly monitors its own performance and
will alarm in the event that a fault is detected. These alarms
are communicated through the hmi and can be monitored
in complete detail by a bms system through the Modbus or
BACnet connection.
In addition, a basic monitoring can be setup using the volt
free contacts.
The 3750-single system has 9, whereas twin system has
13 volt-free contacts (vfc) for communicating faults in the
unit or the system alarms it is fitted to. Pump Run VFCs are
provided as Optional.
The General/Common alarm (G) - NO3 (Main) is triggered
by any kind of alarm on the unit which may requires
immediate attention.
The other alarms indicate a major fault with either the 3750
itself or the system it is monitoring. These alarms should be
acted on immediately and could be appropriate to use as a
Boiler Interlock.
23.1 break tank low/high water level
23.1.1 low water level
The low water level alarm will be activated when the break
tank level low switch tripped.
functions
• All pump(s) will stop running
• Activates LLL alarm on display
• Activates Low water alarm and Common Alarm VFCs.
note
This is a major alarm. In Low level alarm condition the system
will stop (pumps) until the water level returns to normal.
Once level rises above the switch, the unit will then auto
reset and operate as normal.
23.1.2 high water level
The high water level alarm will be activated when the break
tank high level switch tripped.
functions
• Activates HLL alarm on display
• Activates High water alarm and Common Alarm VFCs.
note
This is a minor alarm. In High Level alarm condition the sys-
tem will not stop, pumps operation will be unaected.
Once level drops below the switch, the unit will then auto
reset and operate as normal.
23.2 low system pressure
The low system pressure alarm will be activated when the
pressure at the respective transducer drops below the value
set for low pressure Parameter.
functions
• Activates LPr alarm on display
• Activates Boiler Interlock alarm on display
• Activates Low system pressure, Boiler interlock and
Common Alarm VFCs.
note
This is a major alarm. The unit will stop pumping to the
system with the low pressure until the pressure returns to
normal, if the low pressure is due to a system leak, it needs to
be rectified and system fill pressure restored.
The unit will then auto reset and operate as normal.
23.3 high system pressure
The high system pressure alarm will be activated when the
pressure at the transducer rises above the value set for High
Pressure Parameter.
functions
• Activates HPr alarm on display
• Activates Boiler Interlock alarm on display
• Activates High system pressure, Boiler interlock and
Common Alarm VFCs.
note
This is a major alarm. The unit will stop pumping to the sys-
tem with the high pressure alarm until it returns to normal.
The unit will then auto reset and operate as normal.
23.4 transducer failure
The transducer failure alarm will be activated when the trans-
ducer loses its signal.
functions
• All pump(s) will stop running
• Activates SF alarm on display
• Transducer failure – if the sensor exceeds check values,
activates Common Alarm contact (G)
note
This is a major alarm. The system will stop all pumps, fault
must be rectified before the unit can operate as normal.
This alarm must be manually reset.

installation &
operating instructions
3750 Pulpress
Pressurisation unit
17
23.5 pump 1 tripped
In 1Pump configuration system, Pump-1 trip alarm is
activated, if the pump is tripped during operation, either in
hand or auto.
functions
• Pump will stop running.
• Activates PF1 alarm on display
• Activates Pump 1 tripped and Common Alarm VFCs
note
Pump fault need to be rectified and alarm to be manually
reset before the unit can resume operation of the tripped
pump.
23.6 pump 2 tripped
In 2Pumps configuration system, if a single pump is tripped
during operation, either in hand or auto, it will activate the
following:
functions
• Pump 2 will stop running.
• Activates either PF2 alarm on display
• Activates Pump 2 tripped and Common Alarm VFCs
note
Pump fault need to be rectified and alarm to be manually
reset before the unit can resume operation of the tripped
pump.
23.7 all pumps tripped
If all the pumps on the unit are tripped during the operation,
either in hand or auto mode, it will activate the following:
functions
• Activates PFA alarm on display
• Activates Pump 1& 2tripped Common Alarm VFCs.
note
This is a major alarm. The unit will not operate with the
pumps tripped. The fault will need to be rectified and alarm
to be manually reset before the unit can resume operation.
23.8 pump run
If the pump(s) is running it will activate the following:
functions
• Shows Pump run status on the main screen
• Activates Pump Run VFC (Optional).
23.8 maximum pump run time
The maximum pump run time alarm will be activated if the
pump runs for an excessive amount of time.
functions
• Pump(s) will stop running.
• Activates Prt alarm on display
• Activates Common Alarm contact (G)
note
This is a major alarm. Excessive pump run time may indicate
a system fault such as a slow leak. The problem must be
rectified and this alarm must be reset manually.
23.9 excessive starts
The excessive start alarm will be activated if any pump starts
an excessive number of times over a certain period of time
for a particular system (Hand mode starts are not counted).
functions
• Activates Est alarm on display
• Activates Excessive starts and Common Alarm VFCs
note
This is a major alarm. Excessive pump starts may indicate
a system fault such as a slow leak. The problem must be
rectified and this alarm must be reset manually.
23.10 boiler interlock
Boiler interlock alarm would be activated when the pressure
at the transducer rises above the set high pressure limit,
drops below the set low pressure limit or the unit loses the
power.
functions
• Activates Boiler interlock alarm on display
• Activates Boiler interlock and Common Alarm VFCs
note
This is a major alarm. The system will stop pumping to the
system with the low or high pressure alarm until it returns to
normal.
The unit will then auto reset and operate as normal.

installation &
operating instructions
3750 Pulpress
Pressurisation unit
18
23.11 offline alarm _ cpcoe
The oine alarm(s) would be activated if the expansion
modules loses the communication to the main controller
c.pco. mini.
functions
• Activates Device oine and Common Alarm on display
• Activates Common Alarm contact (G)
note
This is a major alarm. This would cause all the contacts on
the Expansion modules including Boiler interlock(s) to stop
working. It will not stop the unit from pumping but would
require an immediate action.
All the VFCs are NO contacts except for the Boiler Interlocks
which have both NO and NC contacts. To achieve the open
contact in the case of power loss a signal of 10V is provided
to the Boiler Interlock contacts in healthy condition and 0V
in the case of low pressure, high pressure or power failure
alarms, see table 1.
table 1
type of contact
(on j12) healthy status alarm status
NC6(Exp.1)open close
NO6(Exp.1)close open
NC6(Exp.2)open close
NC6(Exp.2)close open
See the wiring diagram for other volt-free contacts.
service reminder
The service reminder warning is displayed ten months after
being activated.
functions
• Activates Ser on display
note
This is not an alarm and does not indicate a system or unit
fault, but will continue to be displayed until the unit receives
a service from an Armstrong Service Engineer or a registered
Armstrong Service provider.
Call Armstrong service to arrange service Visit.

installation &
operating instructions
3750 Pulpress
Pressurisation unit
19
24.0 alarm list
single system alarms
alarm description priority blinking display pump stop reset
Pressure
transducer Transducer failure (SF) - If the sensor exceeds check values 2Yes SF Yes only man
Power pump all Pump 1&2 Tripped (PFA) 3Yes PFA Yes only man
Max pump time Max Pump Run Time (Prt) 4Yes Prt Yes only man
Excessive starts Excessive Pump Start (Est) - Programmable 5Yes Est Yes only man
Low pressure Low System Pressure (Lpr) - When the system pressure is
below the required set point 6Yes LPr Yes only auto
High pressure High System Pressure (Hpr) - When the system pressure is
above the required set point 7Yes HPr Yes only auto
Low water Low Water Level (LLL) - Not enough water in break tank 8Yes LLL Yes only auto
High water High Water Level (HLL) 9Yes HLL No only auto
Power pump 1 Pump 1Tripped (PF1)10 Yes PF1 Yes only man
Power pump 2 Pump 2Tripped (PF2)11 Yes PF2 Yes only man
Service reminder
Service Reminder (ser) - When Commissioned, date for service
reminder will be set. Armstrong service team can reset after
new.
12 Yes ser No only man
Device offline Device offline alarm - If the communication is lost between
cPCO-mini and cPCOe expansion unit. 13 Yes 13 No only auto
Boiler interlock Boiler interlock (HPr/LPr) - If the pressure above or below the
required setpoint for system. 15 Yes 15 Yes only auto
twin system alarms
alarm description priority blinking display pump stop reset
Pressure
Transducer - 1
Sys1 Transducer failure (SF1) - If the sensor exceeds check
values 2Yes SF1 Yes only man
Pressure
Transducer - 2
Sys2 Transducer failure (SF2) - If the sensor exceeds check
values 3Yes SF2 Yes only man
Power Pump all Pump 1&2 tripped (PFA) 4Yes PFA Yes only man
Max Pump time Max Pump run Time (Prt) 5Yes Prt Yes only man
Excessive starts - 1Sys1 Excessive Pump Start (Est1) - Programmable 6Yes Est1 Yes only man
Excessive starts - 2Sys2 Excessive Pump Start (Est2) - Programmable 7Yes Est2 Yes only man
System - 1Low
Pressure
Sys1 Low System Pressure (LPr1) - When the system pressure
is below the required set point 8Yes LPr1 Yes only auto
System - 2Low
Pressure
Sys2 Low System Pressure (LPr2) - When the system pressure
is below the required set point 9Yes LPr2 Yes only auto
System - 1High
Pressure
Sys1 High System Pressure (Hpr1) - When the system pressure
is above the required set point 10 Yes HPr1 Yes only auto
System - 2High
Pressure
Sys2 High System Pressure (Hpr2) - When the system
pressure is above the required set point 11 Yes HPr2 Yes only auto
Low water Low Water Level (LLL) - Not enough water in break tank 12 Yes LLL Yes only auto
High water High Water Level (HLL) 13 Yes HLL No only auto
Power Pump 1Pump 1 Tripped (PF1) 14 Yes PF1 Yes only man
Power Pump 2Pump 2Tripped (PF2) 15 Yes PF2 Yes only man
Device Oine - 1Device 1Oine - If the communication is lost between cPCO-
mini and cPCOe-1 expansion unit. 16 Yes 16 Yes only auto

installation &
operating instructions
3750 Pulpress
Pressurisation unit
20
25.0 maintenance check
Regular check (Every 3Months)
• Check the pump(s) are developing the correct pressure
and are not noisy or vibrating or air-locked.
• Check that the mechanical seal is not leaking.
• Check that the motor is not overheating.
• Checks at six monthly intervals
• Check electrical installation thoroughly for defects. En-
sure that the earth connections are making good contact.
• Check that the break tank is clean.
• Check the operation of the high and low pressure
set points.
• Check low level float switch, (high if fitted).
• Check vessel air charge
maintenance
For Maintenance Please contact our Service division on
service@armstrongfluidtechnology.com
Phone: [phone]
twin system alarms
alarm description priority blinking display pump stop reset
Service Reminder
Service Reminder(ser) - When Commissioned, date for service
reminder will be set. Armstrong service team can reset after
new.
17 Yes ser No only man
Device Oine - 2Device 2Oine - If the communication is lost between cPCO-
mini and cPCOe-2expansion unit. 19 Yes 19 No only auto
Boiler Interlock - 1Boiler Interlock 1- If the pressure above or below the required
setpoint for system - 120 Yes BI1 Yes only auto
Boiler Interlock - 2Boiler Interlock 2- If the pressure above or below the required
setpoint for system - 2 21 Yes BI2 Yes only auto