MAXXflo Evo Water Heaters | Andrews Water Heaters

Features	Benefits
30 and 60kW single burners and twin burners between 90 and 150kW	With fewer burners both commissioning and planned maintenance costs are minimised. Offering in-built redundancy and flexibility (90 and 150kW twin burners).
Independent service valves and pressure sensors on each heat exchanger in twin burner versions	Full built in redundancy and service flexibility as burners and heat exchangers can be isolated.
Low NOx burners	Compliant with and exceeds current legislative requirement.
High efficiency modulating pumps (ErP rated A)	Improved operating efficiencies with greater temperature control.
Multi-line graphical display	Access to live data, settings and history. Easy to use with full control of the burners and accurate charging of integral tank.
Ready to connect into BMS via Modbus protocol	Easy integration into BMS for remote monitoring and control; identifies specific problems and maximises maintenance efficiency.
Full anti-legionella functions with strap-on sensor as standard	Control of secondary return circuit temperature and pump operation.

Features
30 and 60kW single burners and twin burners between 90 and 120kW
Independent service valves and pressure sensors on each heat exchanger in twin burner versions
Low NOx burners
High efficiency modulating pumps (ErP rated A)
Multi-line graphical display
Ready to connect into BMS via Modbus protocol
Full anti-legionella functions with strap-on sensor as standard

Benefits
With fewer burners both commissioning and planned maintenance costs are minimised. Offering in-built redundancy and flexibility (90 and 120kW twin burners).
Full built in redundancy and service flexibility as burners and heat exchangers can be isolated.
Compliant with and exceeds current legislative requirement.
Improved operating efficiencies with greater temperature control.
Access to live data, settings and history. Easy to use with full control of the burners and accurate charging of integral tank.
Easy integration into BMS for remote monitoring and control; identifies specific problems and maximises maintenance efficiency.
Control of secondary return circuit temperature and pump operation.

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	30 and 60 kW Single Burner
		CWH 30/201	CWH 30/301	CWH 60/201	CWH 60/301
	Product Code	7726948	7726950	7726949	7726951
Performance
Maximum Heat input net (gross)	kW	28(31)	28(31)	56(62)	56(62)
Heat output	kW	30.5	30.5	61	61
Gross thermal efficiency	%	98	98	98	98
Standby loss	kWh/day	1.68	2.26	1.68	2.26
ErP
NOx emissions (0% 0₂)	mg/kWh	39	39	36	36
ErP efficiency rating		A	A	A	A
Water heater efficiency	%	95	98	91	97
Noise level (EN15036-1 avg @1m)	dBA	53	63	53	63
Gas data
Gas flow rate (natural gas)	m3/h	2.95	2.95	5.95	5.95
Gas flow rate (propane)	m3/h	1.15	1.15	2.35	2.35
Water
Storage capacity	litre	200	300	200	300
Recovery rate at 50ºC rise	litre/hr	480	480	960	960
Recovery rate at 56ºC rise	litre/hr	429	429	856	856
maximum operating pressure (unvented)	bar	6	6	6	6
Minimum working pressure	bar	0.8	0.8	0.8	0.8
Maximum pressure	bar	7.5	7.5	7.5	7.5
Electrical
Fuse rating	amp	5	5	5	5
Power consumption - standby	W	3.5	3.5	3.5	3.5
Power consumption - max	W	100	100	145	145
Electrical requirements	V	220 - 240 @ 50 Hz	220 - 240 @ 50 Hz	220 - 240 @ 50 Hz	220 - 240 @ 50 Hz
Misc.
Weight full	kg	370	485	380	490
Weight empty	kg	155	165	170	180
Maxiumum outlet temperature	C	65	65	65	65
Maximum flue gas temperature	C	90	90	90	90
Connection sizes and Dimensions
Inlet/outlet connections	BSP	1 1/2"	1 1/2"	1 1/2"	1 1/2"
Return connection	BSP	1"	1"	1"	1"
Gas connection	BSP	3/4"	3/4"	3/4"	3/4"
Water heater height	mm	1556	1980	1556	1980
Diameter of water heater	mm	602	602	602	602
Water Heater depth	mm	1046	1046	1046	1046
Flue diameter - conventional flue	mm	80	80	80	80
Flue diameter - concentric balanced flue	mm	80/125	80/125	80/125	80/125
Service clearance
Front	mm	800	800	800	800
Right side	mm	200	200	200	200
Rear	mm	200	200	200	200
Left side	mm	300	300	300	300
Above	mm	300	300	300	300
Shipping
Shipping width	mm	880	880	880	880
Shipping depth	mm	1160	1160	1160	1160
Shipping height	mm	2213	2213	2213	2213
Shipping weight	kg	224	239	234	239

	90, 120 and 150 kW Twin Burner
		CWH 90/302	CWH 120/302	CWH 150
	Product Code	7726952	7726953	7800597
Performance
Maximum Heat input net (gross)	kW	84 (93)	112 (124)	135
Heat output	kW	91.6	122	147
Gross thermal efficiency	%	98	98	98
Standby loss	kWh/day	2.26	2.26	2.26
ErP
NOx emissions (0% 0₂)	mg/kWh	39	36	36

Water heater efficiency	%	91	90	97
Noise level (EN15036-1 avg @1m)	dBA	62	65	66
Gas data
Gas flow rate (natural gas)	m3/h	8.7	11.6	13.7
Gas flow rate (propane)	m3/h	3.5	4.7	5.5
Water
Storage capacity	litre	300	300	300
Recovery rate at 50ºC rise	litre/hr	1440	1920	2572
Recovery rate at 56ºC rise	litre/hr	1286	1712	2297
maximum operating pressure (unvented)	bar	6	6	6
Minimum working pressure	bar	0.8	0.8	0.8
Maximum pressure	bar	7.5	7.5	7.5
Electrical
Fuse rating	amp	5	5	5
Power consumption - standby	W	5.5	5.5	5.5
Power consumption - max	W	210	290	359
Electrical requirements	V	220 - 240 @ 50 Hz	220 - 240 @ 50 Hz
Misc.
Weight full	kg	485	505	539
Weight empty	kg	185	205	226
Maximum outlet temperature	C	65	65	65
Maximum flue gas temperature	C	90	90	90
Connection sizes and Dimensions
Inlet/outlet connections	BSP	1 1/2"	1 1/2"	1 1/2"
Return connection	BSP	1"	1"	1"
Gas connection	BSP	3/4"	3/4"	1"
Water heater height	mm	1980	1980	1983
Water heater width	mm	602	602	602
Water Heater depth	mm	1046	1046	1154
Flue diameter - conventional flue	mm	130	130	130
Flue diameter - concentric balanced flue	mm	130/200	130/200	130/200
Service clearance
Front	mm	800	800	800
Right side	mm	25	25	25
Rear	mm	20	20	20
Left side	mm	300	300	300
Above	mm	400	400	400
Shipping
Shipping width	mm	880	880	880
Shipping depth	mm	1160	1160	1220
Shipping height	mm	2213	2213	2213
Shipping weight	kg	254	274	297

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Error Code	Error Code Description	Diag. Code	Notes
20	Boiler temperature 1, sensor error	Other	Boiler flow sensor (B2) is outside normal limits
		439	Boiler flow sensor (B2) is short-circuit
		440	Boiler flow sensor (B2) is open-circuit
26	Common flow temperature sensor error	Any	Check connections or replace faulty sensor located on common flow pipe work up stand section (B10)
28	Flue gas temperature, sensor error	539 543	Flue gas sensor (B8) is short-circuit
28	Flue gas temperature, sensor error	540 544	Flue gas sensor (B8) is open-circuit
40	Return temperature 1, sensor error	Other	Boiler flow sensor (B7) is outside normal limits
		441	Boiler flow sensor (B7) is short-circuit
		442	Boiler flow sensor (B7) is open-circuit
50	DHW temperature 1, sensor error	Any	Check connections or replace faulty DHW tank sensor (B3)
81	LPB short-circuit or no power supply	Any	LPB Short circuit or no bus power supply. Check operation of OCI345 modules and connecting cables
82	LPB address collision	Any	LPB address duplicated on another Control PCB - Check address of all control PCBs via parameter 6600
83	BSB short-circuit or no power supply	Any	No BSB communication or wires shorted - Check operation of GUI or OZW672 (if fitted)
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	Extension module 1, error	Any	AGU2.5 configuration error - Check parameters
99	Extension module 2, error	Any	AGU2.5 configuration error - Check parameters
100	More than one clock time master	Any	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	Any	The control PCB battery backup for the time clock has been depleted following the restoration of power to the heater. If this message has not cleared within 10 minutes of power being turned on, turn the power off, wait 10 seconds and turn the power on again. This message does not prevent the operation of the heater in any way.
105	Maintenance message	Any	Item requiring attention but not preventing appliance operation (e.g. 12 Month service due). Check details of message on the appliance Front GUI screen.
110	SLT Lockout	Others	General overheating issue. Check for pump operation, trapped air and heat exchanger blockages. Monitor temperatures of system to establish problem area. Check that the connector X18 (yellow looped wire) is in place on the control PCB
		428 438 817	Maximum Delta T of primary system exceeded. Check that the flow and return sensors are operating correctly. Check pump operation and check for trapped air in the heat exchanger.
		426 437 815	Flow temperature heat up gradient exceeded. Check pump operation and check for trapped air in the heat exchanger. Flow through heat exchanger may be restricted.
		420 421 819 820	Return temperature greater than flow temperature. Check that the flow sensor is operating correctly and the pump direction is correct.
		430 419 422 423 809 810 813 814	Flow temperature exceeded. Check pump operation and check for trapped air in the heat exchanger. Flow through heat exchanger may be restricted.
		424 425 811 812	Return temperature outside plausible limits. Check return sensor (B7) and replace if necessary.
		422 423 809 810	Flow sensor readings are outside plausible limits. Check flow sensor (B2) and replace if necessary.
111	Shutdown limit thermostat	Any	Heat exchanger temperatures have been exceeded. Investigate flow rates and controls to determine causes of temporary fault code.
125	Maximum boiler temperature exceeded	Any	Flow temperatures have been exceeded. Appliance will continue once temperatures have dropped below maximum allowed limits.
126	DHW charging temperature not reached	Any	Charging temperature never achieved. Check operation and heat up times for DHW.
127	DHW legionella temperature not reached	Any	Check operation of legionella function and DHW system. Legionella setpoint has not been achieved within 48 hours of the legionella function operating. If using a secondary return system and sensor, do not set the legionella function setpoint too high, as the heat losses around the hot water pipework may not permit this setpoint to be achieved.
128	Loss of flame during operation	394	Flame lost in operation within the first 7 seconds of the start of the modulation phase. Check the CO2 is set correctly and check operation and condition of ionisation electrode.
		854	Flame lost in operation after the first 7 seconds of the start of the modulation phase. Check the CO2 is set correctly and check operation and condition of ionisation electrode.
		625	Flame lost in operation more than 24 times in a 24 hour period. Check the preceding error codes for details on when the ionisation current was lost. Check the operation of the ionisation electrode, gas supply, and flue system. Check that there is sufficient gas available to the heater at all times.
130	Flue gas temperature too high	Any	Check causes of high temperatures before operating Appliance. Inspect inside of heat exchanger for dirt build up. Check CO2 levels at min and max output.
133	Safety time exceeded	395	Records individual ignition failures and the times they have occurred. Check gas supply, spark electrode, spark generator, Ionisation probe, CO2 setting and flue system.
133	Safety time exceeded	625	A total of 5 unsuccessful ignition attempts has occurred within a 24 hour period. This is the point that the heater went into permanent lockout.
142	Device failure (Bus)	Any	Check that the appliance and OZW672 is powered and connected correctly.
151	BMU Internal error	330 331	Ignition output error. Check operation of spark generator. Re- place PCB if no fault with the spark generator found.
		332 333	Gas valve output error. Check operation of gas valve. Replace PCB if no fault with the gas valve found.
		Other	Check if polarity of live and neutral has been reversed to the appliance. Replace PCB if fault repeatedly occurs.
152	Parameterization error	Any	Incorrect / conflicting parameters input (last changed parameters need to be investigated).
153	Unit Locked	622	Temperature inside the appliance casing has exceeded 90OC. Check heat engine door seals and door nuts are correctly tightened. Pressing the reset for more than 10 seconds will also produce this lockout.
153	Unit Locked	848 849	Parameter update finished. Press reset to apply changes.
160	Fan speed threshold not reached	Any	Fan does not reach required speed setpoint via PWM control - Check wiring and operation of fan. Replace fan if necessary
		377	Fan speed not reached - Home run stage.
		378	Fan speed not reached - Standby stage.
		379	Fan speed not reached - Ignition stage.
		380	Fan speed not reached - Pre purge stage.
		381	Fan speed not reached - Post purge stage.
162	Air pressure switch	Any	Air pressure switch has activated or is open circuit. Check for flue restriction or incorrect flue installation. Check air pressure switch function (operates at 365 Pa). Condense pipework may be blocked. Check the condensate pipe system is free to flow into the trap and beyond.
171	Fault input 1	Any	User defined OZW672 input D1 has been activated.
172	Fault input 2	Any	User defined OZW672 input D2 has been activated.
183	Unit in parameterisation mode	Any	Code will be displayed when a programming stick is used but should clear when programming is complete. Repeat stick operation if fault code persists.
217	Sensor error	Any	Ionisation current fault or short circuit. Check operation of ionisation probe using parameter 8329 (menu - Diagnostics heat generation). Ionisation probe may need replacing. Check earthing to the heater.
218	Pressure supervision	Any	Water pressure inside appliance is low but not yet critical. Appliance will continue to operate but at 80% of maximum output. Full output power will not be available until the water pressure is at or above 0.2 bar.
317	Mains frequency outside permitted range	Any	Check electrical supply to appliance.
322	Water press 3 too high	Any	Water pressure inside the appliance is too high for safe operation. Operation will automatically resume once water pressure is at or below maximum levels. Check that the appliance flow is not restricted or blocked, or the water isolator valves are shut off.
323	Water press 3 too low/td>	Any	Water pressure inside appliance is too low for safe operation. Operation will automatically resume once water pressure is at or above 0.1 bar.
324	Input BX, same sensors	Any	BX sensor duplicated - check parameters.
325	Input BX/extension module, same sensors	Any	BX extension module sensor duplicated - check parameters.
327	Extension module, same function	Any	AGU2.5 extension module function duplicated - check parameter setup for the AGU2.5 extension module (“Configuration” menu).
335	Sensor input BX21 without function	Any	BX21 connected but not defined - define parameters for this sensor connected to the AGU2.5 extension module.
336	Sensor input BX22 without function	Any	BX22 connected but not defined - define parameters for this sensor connected to the AGU2.5 extension module.
353	Cascade flow sensor B10 missing	Any	Check connections and configuration of common flow temperature sensor (B10), which is located at the feed into the tank on the front, left, mid section of the appliance.
384	Extraneous light	Any	Ionisation current detected before ignition. Check ionisation current (“Diagnostics producer” parameter 8329). If there is a current present whilst the burner is in standby, turn off gas supply to check gas valve is closing completely. If current is still present, remove ionisation probe and use a screwdriver to clear the opening through the heat engine door before replacing the probe.
385	Mains under voltage	Any	Mains voltage below 185v - check electrical supply to the appliance.
386	Fan speed tolerance	Any	Fan outside allowed speed tolerance level. Check all wiring. Check for possible air or flue restriction. Replace fan if all airways are clear and wiring is good.
432	Function earth not connected	Any	No Ignition earth, X1 / X17 not connected or earth fault.
NA	Operating mode button locked - Cannot operate in DHW mode (No fault displayed)	Any	Remote system enable operating. Check to see if link wire is still in place or controls wired to these terminals are closing this circuit. When the appliance is operating via the volt free enable signal, it is not possible to operate the appliance manually via the GUI if the signal is not enabled (circuit closed).

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