andrews MAXXflo EVO CWH 30/201 Instruction Manual
Andrews. Built to perform.
Please read and understand these instructions before commencing installation and leave this manual with the customer for future reference.
MAXX
H
CWH 30/201, CWH 30/301, CWH 60/201, CWH 60/301
CWH 90/302, CWH120/302, CWH 150/302
CONTROLS OPERATING INSTRUCTION MANUAL
2 MAXXo EVO
Blank Page
Introduction 3 MAXXo EVO
Warnings and important notices 4
1.1 The heater controls 7
1.2 The Graphical User Interface (GUI) 7
1.3 Navigate and set using the control knob 8
1.4 Display symbol meanings 9
2.1 The home page 10
2.2 Setting the time and date 10
2.3 Setting DHW heating time program 11
2.4 Setting DHW temperature 13
2.5 Setting DHW operating mode 14
2.6 Temporary DHW operation function 15
2.7 Information pages 16
2.8 Error messages 17
2.9 Maintenance messages 18
2.10 Error codes 19
2.11 Regional settings 24
3.1 Logging into Commissioning mode 25
3.2 Input / Output test 26
3.3 Communication 27
3.4 Source 28
3.5 Consumer 29
3.6 Versions 30
3.7 Complete parameter list 31
3.8 Commissioning wizard 31
4.1 Logging into Engineer mode 32
4.2 Error history - diagnostic codes 33
4.3 Error history - Burner control phase 35
4.4 Complete parameter list 36
4.5 Complete parameter list table 37
4.6 Refresh operator unit 47
Introduction 4 MAXX o EVO
- turn o or on any electrical switches (including light switches)
- smoke
- use the telephone
- evacuate persons away from the source of the gas smell
- close the main gas shuto valve
- open all the windows and doors where the gas leakage has occurred
- inform the gas authority or a competent specialist as soon as possible
This Andrews Water Heaters product has been designed and manufactured to comply with cur-
rent European standards of safety. However, following an improper use, dangers could arise
concerning the safety and life of the user or of other people, or damage could be caused to the
heater or other objects. This heater is designed to be used in a domestic hot water supply and
storage system. Any other use of this heater will be considered improper. Andrews Water Heat-
ers declines any responsibility for any damage or injuries caused by improper use. In order to
use the heater according to its designed scope, it is essential to carefully follow the instructions
given in this guide.
This heater is not intended for use by persons with reduced physical, sensory or mental capabili-
ties, or lack of experience and knowledge, unless they are given supervision or Instruction con-
cerning the use of it by a person responsible for their safety. Children under the age of 12 years
should not be permitted to use the heater.
The installation, adjustment & servicing of this heater must be carried out by a competent person
and installed in accordance with current standards and regulations. Failure to correctly install or
maintain this heater could cause injury to persons or damage to property. The manufacturer shall
not be held liable for any such injury and/or damage.
Do not store or use explosive or easily in ammable material (such as petrol, paint or paper) in
the same room where this heater has been installed.
Water temperature over 50OC can cause burns and in severe cases injury or death. Children,
the elderly and the physically or mentally disabled are most at risk from scald injury. Feel water
before bathing and showering. Temperature limiting devices such as mixing valves should be
installed whenever possible to ensure safe temperatures at outlets
This heater has been designed for use with G20 (natural gas) and G31 (lique ed propane gas)
and is manufactured to give an e cient, safe and long service life. To ensure continued trouble-
free operation of this heater at maximum e ciency, it is essential that correct installation, com-
missioning, operation and service procedures are carried out strictly in accordance with the
instructions given in this manual.
Only original parts and accessories from the manufacturer may be used on this heater. Using
non-approved parts may compromise the safety of the heater and invalidate any warranty.
In the event of failure and/or suspected faulty functioning of the heater. Switch o the heater and
contact a suitable quali ed technician. Do not attempt to make any repairs yourself, unless you
are suitably quali ed and competent to do so.
Introduction 5 MAXX o EVO
To ensure continued e cient operation of the heater it is recommended that the condensate
outlet is checked and serviced at regular intervals. The frequency of servicing will depend upon
the particular installation and usage but in every case a maximum of twelve months should be
allowed between service inspections.
The condensate outlet shall not be modi ed or blocked. It is recommended that as part of the
regular maintenance the condensate systems is examined, cleaned and the condensate trap on
the side of the heater is emptied and cleaned. The trap can be examined by unscrewing by hand
the bowl at the bottom of the trap. See illustration below:-
A detailed guide to the Installation and maintenance of this heater is supplied separately (Instal-
lation and Maintenance Manual) and this is intended for use by the specialist commercial install-
ers and service engineers.
Introduction 6 MAXXo EVO
The capacity in litres of the in-built DHW tank is given in the table below:-
Tank size 200 litres 300 litres
Models CWH 30/201
CWH 60/201
CWH 30/301
CWH 60/301
CWH 90/302
CWH 120/302
CWH 150/302
This heater has been designed for use with G20 and G31 gases and is manufactured to give an ecient, safe and
long service life. To ensure continued trouble-free operation of this heater at maximum eciency, it is essential that
correct installation, commissioning, operation and service procedures are carried out strictly in accordance with the
instructions given in the “Installation & Maintenance Manual” supplied separately to this guide.
Only original parts and accessories from the manufacturer may be used on this heater. Using non-approved parts may
compromise the safety of the heater and invalidate any warranty.
It is the law that all gas heaters are installed by a competent person in accordance with the regulations. Failure to
install or maintain heaters correctly could lead to prosecution.
It is in your own interest, and that of safety, to ensure that the law is complied with. The installation of the Heater
MUST also be in accordance with the current Wiring Regulations, the Local Building Regulations, Building Standards,
the Bye Laws of the Local Water Undertaking, any relevant requirements of the Local Authority.
A detailed guide to the Installation and maintenance of this heater is supplied separately (Installation and
Maintenance Manual) and this is intended for use by the specialist commercial installers and service engi-
neers.
This heater is tted with an automatic Frost Protection system. Provided there is Mains power, Gas is connected and
the heater is not in a lockout condition, this system will be eective in preventing damage to the heater caused by
frozen water. This protection will be active even when the controls are in the standby operation mode.
If the temperature of the DHW tank should fall below 5OC heat engine(s) will operate to bring the DHW tank tempera-
ture up to 6OC before turning o again.
If the temperature of the internal ow pipework (heat engine) was to drop to 3OC the heat engine(s) will operate until
the temperature registered by the heat engine return sensor reaches 16OC. This will also heat up the tank temperature
to around 16OC
Introduction 7 MAXX o EVO
The control knob is used to operate the GUI. The display is organised into a navigation bar, status bar, and
work area.
Home page
Hot water page Work area
Information page
Setup page
The water heater is operated by rotating the control knob to move the selector over the screen then push-
ing the control knob to select the item. When selected the item will be displayed as inverse and can then be
changed by rotating the control knob and the change is con rmed by pushing the control knob.
If the item was selected by mistake, take your hand o the control knob (do not push the control
knob) ,wait for 5 seconds and the item will de-select and revert to its previous value.
In order to return to the previous screen select the back “arrow” or “back” text in the bottom right corner of the
screen at any time
Cascade ow temp 60.1 oC
DHW temp 1 58.9 oC
Cascade ow temp 60.3OC
DHW temp 1 58.2OC
3
4
1
2
Introduction 8 MAXX o EVO
Not selected: The operating object is displayed normally, black on white background.
Preselected: The operating object is framed.
Selected: The operating object is inverted with white on black background.
Turn control knob.
• The preselection is displayed with a frame around the symbol.
• The related topic page is displayed in the work area.
Press control knob.
• The symbol is selected on the navigation bar and is displayed inverted.
• The rst adjustable operating object of the work area is preselected.
Go back using the Back arrow on the navigation bar.
• The symbol in the navigation bar is once again preselected.
Turn control knob.
• The preselection is displayed with a frame around the operating object
Press control knob.
• The operating object is selected and is displayed inverted.
• The lower level is displayed if the operating object consists of multiple levels (e.g. Time
program).
Turn control knob. Set value.
Press control knob. Con rm the set value.
• The set operating object is once again preselected.
Continue navigation
• To other pages, for selected and inverted displayed page titles.
Back “Back” goes a level higher within the work area.
Back arrow to return to navigation bar.
Editing time-out 5 seconds A changed setting reverts to the original state if not con rmed
within this period.
Long button
pressure
> 3 seconds A long press of the knob on any expert view returns to the “Expert
view start page” (diagnostics page).
Locking time-out 1 minute Certain plant states are displayed in the foreground, e.g. Special
operations page. However, users are still able to go to any page
and set values. The foreground page returns after this period with-
out operator intervention.
Operating time-out 8 minutes The display switches automatically after this period without opera-
tion to the start page on the operator unit or display in standby on
the room unit.
Introduction 9 MAXXo EVO
Accessible for end-user and experts:
Start page: Heater status. Access to system operation mode.
DHW page. Access to temperature and time clock settings
Info pages:
• Messages (errors, events)
• Heater information
Service/setting pages:
• Setting options for domestic hot water system
• Operate special operations (e.g. for maintenance work)
• Login in expert view (see note below)
Available in addition for experts:
Diagnostic pages: Analyse and test heater and system.
Adjust/repair pages:
• Adapt parameters in ‘Complete parameter list’
Symbol ‘Alarm’ indicates a system error.
Symbol ‘Maintenance/Special operations’ indicates the presence of a maintenance message
or special operation feedback.
Symbol ‘Event’ indicates an event message from the system.
‘Hand’ symbol The ‘Hand’ symbol is displayed if the heater operation mode is being held “o”
due to the operation switch being in “standby” position or the hot water operation mode is set
to o in the Domestic hot water page.
12:00 The device clock is synchronized with the clock from the connected controller.
Symbol ‘User’ and the number to the right (access level 1 to 3) indicate which user level is
currently active.
• None: User
• 1: Commissioning engineer
• 2: Heating engineer
• 3: OEM
Symbol ‘Producer’ indicates the water heater burner is currently operating and a ame has
been successfully detected.
End user 10 MAXX o EVO
Evaluation of information displayed:
Heater GUI Display
The start page for the heater GUI unit displays the most important information on the water heater and system
operation mode. There are no settings that can be applied whilst in this screen.
To set the time:
1. Rotate until the settings tab is highlighted and press “Regional settings (1/3)” should already be prese-
lected
2. Rotate to select the time eld value and press
3. Rotate and enter a new hour value by pressing
4. Rotate and enter a new minute value by pressing
To set the date:
5. Rotate to select the date eld and press
6. Rotate and enter a new date, month and year value by pressing after each item set
7. Rotate for additional regional settings or exit regional settings with “Back”.
8. It is also possible to adjust the dates set for the start and end of summer time, for the purposes of automatic
clock adjustment
3
Cascade ow temp 60.1 oC
DHW temp 1 58.9 oC
Line only displayed
for 90,120 or 150kW
models
Regional settings (1/3)
Time
14:42
Date
09.08.2016
3 3
3 3
33
3
3
3
3
3
3
End user 11 MAXX o EVO
This is achieved by turning located on the front facia of the heater from STANDBY (0) to ON (I)
Select the Domestic Hot Water (DHW) tab by rotating and pressing . The operating mode should be displayed as
“On”. See example below:
With the DHW tab selected, rotate to highlight the time program eld,
Press to enter the time clock setting page. Once the eld is selected rotate to reach the time programming
screen.
Domestic hot water
Operating mode On
Temporary ...
Nominal set point 28oC
Time program 00 12 24
Domestic Hot Water
Operating mode On
Temporary ...
Nominal set point 28oC
Time program 00 12 24
When is ON (I)
DHW operating mode should be ON
If the operating mode is not ON when is
ON, change the mode to ON
When is STANDBY (O)
DHW operating mode will be OFF
OPERATION SWITCH
1
1
Cascade ow temp 60.3OC
DHW temp 1 .62OC
3
1
1
1
3
3 3
End user 12 MAXX o EVO
Select the day eld to change the times of that day
Turn and push the control knob to set the start and end times of the program. Scroll to the beginning (00 hours) to
insert another time band (up to a total of 3 time bands per day can be set).
To delete a time band use the control knob to move the start and end times of the band to be the same then press the
control knob.
The time settings of any day can be copied and applied to other days in the weekly schedule
After setting up the times of the day required to be copied, rotate (3) and select copy in order to move to the “copy to
screen”.
Domestic hot water
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
00 12 24
Back
Monday
Set time program
12:00 to 18:00
00 06 12 18 24
Back
Copy
00 06 12 18 24
Monday
Set time program
12:00 to 18:00
00 06 12 18 24
Back
Copy
Commissioning 13 MAXX o EVO
Using the control knob select the day to be copied to and press the control knob. Repeat this operation as required.
Once times have been copied select “Done “ to return to Domestic hot water page.
With the operation switch on the front facia turned ON (I) select DHW tab and rotate the control knob to highlight the
“Nominal set point” eld and push the knob to select.
Once the eld is selected rotate the control knob to change the Domestic Hot Water set point. Con rm the selection
by pressing the control knob within 3 seconds.
Domestic hot water
Operating mode On
Temporary ...
Nominal set point 60oC
Time program 00 12 24
Copy Monday to
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Done
Copy Monday to
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Done
End user 14 MAXX o EVO
Changing the operating mode is achieved using the operation switch on the front of the facia (see below).
When operation switch is set to position O (STANDBY), DHW operating mode should be OFF (see example below)
When operation switch is set to position I (ON), DHW operating mode should be ON (see example below)
If the operating mode is not ON when the operation switch is set to I (ON), change the operating mode to
ON using the control knob and push to select. Test that the operating mode changes when the position of
the operation switch changes from ON to STANDBY and back to ON.
Domestic Hot Water
Operating mode On
Temporary ...
Nominal set point 28oC
Time program 00 12 24
Domestic hot water
Operating mode O
Temporary ---
Nominal set point ---
Time program 00 12 24
End user 15 MAXX o EVO
Outside of the programmed operation times for water heating, the operation of the water heater can be turned on for
a single occasion where the domestic hot water will be heated to the nominal set point. The heater control returns to
normal operation using pre-settings as soon as the hot water reaches set point.
With the icon highlighted press the control knob to select the Domestic hot water page. Using the control knob
move the indicator over the “Temporary” eld and press the control knob to highlight the eld
Rotate the control knob to change the “Temporary” eld from “...” to “Recharging” and press the control knob to select
the value
The heater operation in now active and will recharge the DHW tank water to the nominal set point previously pro-
grammed
It is not possible to view or change the nominal set point of the hot water once this operation has been
started. If you have any doubts as to the current DHW set point, cancel the operation (as described
above) and start the heater using the operation mode to view and set the nominal set point.
Domestic Hot water
Operating mode O
Temporary ---
Nominal set point ---
Time program 00 12 24
Domestic hot water
Operating mode O
Temporary Recharging
Nominal set point ---
Time program 00 12 24
End user 16 MAXX o EVO
Information regarding the operation state of the water heater can be viewed by selecting “ ” pages . See example
screen showing the status of DHW:-
To view further pages select the “ ” page and press the control knob. The eld at the top of the screen can now be
selected with the control knob and rotated and selected again for the info page required. See example: -
On a 90, 120 or 150kW model the “Cascade” screen will display the combined ow temperature of both operating heat
engines and this represents the temperature of the water being charged into the tank. On a 30kW or 60kW model
“Boiler temp” represents the temperature of the water being charged into the tank.
Domestic hot water
Charging active
DHW temp 1 58.6oC
Boiler
In operation for domestic hot water
Boiler temp 62.0oC
Water pressure 1.2bar Water pressure only
available on 90, 120 &
150kW models
Cascade
Cascade ow temp 61.9oC
End user 17 MAXX o EVO
If the heater controls are unable to operate the gas burner or it detects a undesirable condition, the controls will put
the heater into a “lockout” mode and the heater may be prevented from operating again, until manually reset. If the er-
ror detected is a minor one, the controls will allow the heater to operate normally, but in either case an error message
symbol will be displayed on the top of the GUI display and a text explanation will be displayed on the home
screen in the Information menu. Any important messages a ecting the operation of the heater should be displayed
instead of the normal “Home” screen.
The error may need to be cleared before the heater will function again. Viewing the info page menu will provide the
error detail (see section 2.10 in this manual for possible error codes). Press the RESET button (located to the left of
the GUI display) and provided the error condition has been corrected the heater will run through the ignition sequence
again.
Example :
In this example the heater has gone into lockout mode, because the primary system pressure has exceeded 9.0 bar.
The resolution would be to rectify the overpressure condition and reset the error to restart heater operation again (see
below)
Once the causes of an error have been recti ed, the lockout is cleared by accessing the reset switch on the front of
the heater. A press of the reset switch of between 1 and 3 seconds will be su cient to reset the heater controls.
Reset rocker switch
A full list of error codes is provided in Section 2.10
Error
322: Water Pressure 3 too high
End user 18 MAXX o EVO
Further diagnostic codes and the history of the last 20 error messages can be found by logging in as
“Engineer” and accessing the “Error” menu. For details on how to do this please refer to section 4.2 of this
manual.
The display will show a symbol if the heater is reporting a maintenance issue. The heater will continue to operate
as normal, but it may in future stop if the maintenance message is ignored and an error develops as a result.
Example :
In this example is used to notify the user, the heater has been in operation for more
than 12 months and requires a service inspection. When servicing has been completed, the service counter should be
reset using parameter 7045, in the Service / special operation menu (see section 4.4 for details)
Maintenance
105: Maintenance message
End user 19 MAXXo EVO
20 Boiler temperature 1, sensor
error
Other Boiler ow sensor (B2) is outside normal limits
439 Boiler ow sensor (B2) is short-circuit
440 Boiler ow sensor (B2) is open-circuit
26 Common ow temperature
sensor error
612 Check connections or replace faulty sensor located on com-
mon ow pipe work up stand section (B10)
28 Flue gas temperature, sensor
error
539
543
Flue gas sensor (B8) is short-circuit
540
544
Flue gas sensor (B8) is open-circuit
40 Return temperature 1, sensor
error
Other Boiler return sensor (B7) is outside normal limits
441 Boiler return sensor (B7) is short-circuit
442 Boiler return sensor (B7) is open-circuit
50 DHW temperature 1, sensor
error
55 Check connections or replace faulty DHW tank sensor (B3)
81 LPB short-circuit or no power
supply
67 LPB Short circuit or no bus power supply. Check external
connections onto the LPB terminals are the not shorted and
the correct polarity. Inspect connections from the GUI to the
Control PCB.
82 LPB address collision 103 LPB address duplicated on the two burner Control PCBs -
Check address of all control PCBs via parameter 6600
83 BSB short circuit Any No BSB communication or wires shorted - Check operation of
GUI or OZW672 (if tted)
84 BSB address collision Any Two appliances connected through BSB (e.g. OZW672) have
the same allocation address. Change one of the appliances
address via parameter 6600
98
99
Extension module 1, error
Extension module 2, error
605
606
Indicates that an expansion module can no longer be “seen”
by the controls. To clear this message when no clipin is
installed, perform a “Store sensors” (parameter 6200) com-
mand, to perform a controls handshake with all connected
sensors and ancillaries.
NB: When applying power to the heater, this fault message
may appear briey, but should self clear within 5 minutes. If
message persists perform a “Store sensors” command
100 More than one clock time
master
105 Only one device should be set as the time master, check on
the GUI (parameter 6640) and any OZW672 connected (in
case of connection to an OZW672, this device should be the
master)
102 Clock master without power
reserve
106 The display backup battery for the time clock may have
become depleted. This message more commonly occurs fol-
lowing the restoration of power to the heater. This message
normally self clears within 20 minutes of power being restored.
If the message does not clear, turn the power o, wait 10
seconds and turn the power on again. This message does not
prevent the operation of the heater in any way but if it persists
it indicates that the clock time may not be retained in periods
of power outages. Contact Andrews Technical Helpline for
advice.
105 Maintenance message 87 Item requiring attention but not preventing appliance operation
(e.g. 12 Month service due). Check details of message on the
appliance Front GUI screen.
End user 20 MAXXo EVO
110 SLT Lockout 306 431
432 433
434 435
436 756
Electronic temperature limits exceeded. General overheating
issue. Check for pump operation, trapped air and heat ex-
changer blockages. Monitor temperatures of system to estab-
lish problem area.
429 818 Safe reset of the error sub code 433 (see above) has not been
met. Allow the water heater to cool further before resetting.
305 412
550 551
754
Mechanical overheat protection circuit is open circuit (connec-
tion X18 on control PCB). Check connector is fully inserted
426 437
815
Flow temperature heat up gradient exceeded. Check pump
operation and presence of trapped air in the heat exchanger.
Flow through heat exchanger may be restricted.
438
817
Maximum Delta T of system exceeded. Check pump opera-
tion and presence of trapped air in the heat exchanger. Flow
through heat exchanger may be restricted.
428 Maximum Delta T of system exceeded. Initial starting of the
pump before the burner is operated, can cause this error. If
accompanied by code 429 within the same minute, this error
can be disregarded.
427 816 Safe reset criteria has not been met. Allow the water heater to
cool further before resetting.
420 421
819 820
Return temperature greater than ow temperature. Check that
the ow and return sensors are operating correctly
419 430
813 814
Flow temperature limit exceeded. Check for overheating is-
sues and ow sensor (B2) performance.
809 810
422 423
Flow temperature not plausible - Reading less than 0OC or
greater than 124OC . Check ow sensor (B2) and replace if
necessary.
425
812
Return temperature limit exceeded. Check for overheating
issues and return sensor (B7) performance.
424
811
Return temperature not plausible - Reading less than 0OC or
greater than 124OC . Check return sensor (B7) and replace if
necessary.
111 Shutdown limit thermostat 264 Heat exchanger temperatures have been exceeded. Investi-
gate ow rates and controls to determine causes of temporary
fault code.
125 Maximum boiler temperature
exceeded
286 500
740
Temperature supervision lockout. Check pump, burner and
ow rates before resetting.
501 Temperature has not increased at ow sensor after burner
start. Check ow temperature sensor is correctly functioning
502 Temperature has not increased at return sensor after burner
start. Check return temperature sensor is correctly functioning
126 DHW charging temperature
not reached
72 Charging temperature not achieved within a two hour time
scale. Check operation and heat up times for heater. Is DHW
demand too high for the designed performance of this heater?
Refer to the technical data in this manual for guidance.
127 DHW legionella temperature
not reached
73 Check operation of legionella function and DHW system. Le-
gionella setpoint has not been achieved within 48 hours of the
legionella function operating.
NB: When using a secondary return system and B39 sensor,
do not set the legionella function setpoint too high, as the heat
losses of the hot water pipework may not permit this setpoint
at the B39 sensor return point before the heater.
This manual suits for next models
6
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