Baxi PREMIER PLUS Series Guide

1
INSTALLATION AND USER INSTRUCTIONS
400L, 500L & 570L Indirect
PREMIER PLUS
Russian Version on Page 17

2
IMPORTANT
PLEASE READ AND UNDERSTAND THESE INSTRUCTIONS BEFORE
INSTALLING THE BAXI PREMIER PLUS WATER HEATER. INCORRECT
INSTALLATION MAY INVALIDATE GUARANTEE.
THE BAXI PREMIER PLUS WATER HEATER MUST BE INSTALLED BY A
QUALIFIED INSTALLER IN ACCORDANCE WITH LOCAL PLUMBING, BUILDING AND
ELECTRICAL REGULATIONS
THIS APPLIANCE CAN BE USED BY CHILDREN AGED FROM 8 YEARS AND ABOVE AND
PERSONS WITH REDUCED PHYSICAL SENSORY OR MENTAL CAPABILITIES OR LACK
OF EXPERIENCE AND KNOWLEDGE IF THEY HAVE BEEN GIVEN
SUPERVISORY OR INSTRUCTION CONCERNING USE OF THE APPLIANCE IN A SAFE
WAY AND UNDERSTAND THE HAZARDS INVOLVED. CHILDREN SHALL NOT PLAY WITH
THE APPLIANCE. CLEANING AND USER MAINTENANCE SHALL NOT BE MADE BY CHIL-
DREN WITHOUT SUPERVISION.
Also:
- Water may drip from the discharge pipe of the pressure-relief device and this pipe must be left open to
the atmosphere;
-The pressure-relief device is to be operated regularly to remove lime deposits and to verify that it is not
blocked;
- How hot water can be drained. (see page 11 for details).
1. IMPORTANT INSTALLATION POINTS
1.1 The BAXI Premier Plus water heater MUST be tted with a pressure relief valve rated at 8 bar.
FAILURE TO PROVIDE ADEQUATE PRESSURE RELIEF WILL INVALIDATE ANY GUARANTEE
AND LEAD TO A DANGEROUS INSTALLATION.
1.2 Where the inlet pressure exceeds 6 bar a pressure reducing valve (set at max. 6 bar) should be
tted to the inlet supply to the heater. This MUST NOT be tted between the pressure relief valve
and the water heater (see diagram 3).
1.3 A check (non-return) valve should be tted on the inlet supply to the water heater. This MUST NOT
be tted between the pressure relief valve and the water heater (see diagram 3). This may be
provided as part of the inlet security group.
2. INSTALLATION – GENERAL REQUIREMENTS
2.1 National Wiring rules may contain restrictions concerning the installation of these water heaters in
certain areas, eg. bathrooms.
2.2 The water heater MUST be installed vertically.
2.3 Enough space should be left around the water heater for pipe connections and for access to
controls and any safety valves tted. Refer to diagram 1 and the dimensions table 1, below to
determine a suitable position for the water heater
2.4 NOTE: Ensure the oor can support the full weight of the water heater, see table 5, below for
cylinder weights.
2.5 DO NOT install where the water heater may freeze.

3
SIZE DIMENSIONS (mm)
400L
500L
AB
1502
1802
832
1132
570L 1997 1336
Table 1: Dimensions
Diagram 1 - Dimensions
320
316
496
666
B
C
A
COLD INLET
PRIMARY FLOW
PRIMARY RETURN
T&P VALVE
SECONDARY RETURN
THERMOSTATIC CONTROL
(BOILER)
3kW IMMERSION
40°
30°
45°
924
HOT OUTLET

4
400 500 570
Max direct kW rating 3 3 3
Coil surface area (m²) 2.0 2.0 2.0
Coil heat up times
(Mins)4
15l/min 43 55 68
30l/min 29 38 44
60/min 21 28 30
Coil rating (kW) ²
15l/min 28.2 27.6 27.0
30l/min 41.9 40.0 39.1
60l/min 56.9 54.3 53.6
Pressure drop through
coil (MPa)
15l/min 0.02
30l/min 0.04
60l/min 0.32
Heat loss (kW/24hrs) 1.71 2.14 2.44
Weight empty (kg) 105 110 115
Weight full (kg) ¹ 505 610 685
Max mains pressure 1.6MPa (16 bar)
Max design pressure 0.8MPa (8 bar)
Operating pressure/PRV set pressure 0.3MPa (3 bar)
Max primary pressure ³ 1.0MPa (10 bar)
Expansion relief valve setting 0.8MPa (8 bar)
Immersion heater electrical rating 3.0kW@240V/2.8kW@230V ~
T&P Rating 90°C/10 bar
Notes:
1. At 3 bar inlet pressure
2. At a primary ow temperature 80°C +/- 2°C
3. The primary coil should not be exposed to more than 0.3MPa (3 bar) without the cylinder being full of
water and under the minimum working pressure.
4. Temperature rise 15°C - 60°C (45°C)
5. Tested to EN 12897:2006
Table 2: Technical Data

5
3. INSTALLATION – PLUMBING
3.1 Refer to section IMPORTANT INSTALLATION POINTS. Plumb in valves in the sequence shown in
diagram 3, below. Ensure the valves are installed in the correct orientation by reference to the direction
of ow arrows marked on them.
3.2 The water connections on the water heater accept direct connection of 1” (to t 28mm pipe). The
thread on the connections is G1” to enable the use of G1” male connections to be used if required.
3.3 The sanitary water INLET is marked BLUE, the OUTLET is marked RED. Several hot outlets can be
served, however, individual site demands should be considered when choosing capacity and the
number of outlets to be served.
3.4 It is recommended that an isolating valve is tted on the cold water supply to the heater.
3.5 A drain cock must be fitted below the heater in the inlet pipe work. It must be sited
between the heater and the check valve or security group (see diagram 3, below)
3.6 A sanitary circuit expansion vessel may be tted to the cold water supply as shown in diagram 3,
below to prevent wastage of expanded water. A 35L expansion vessel is recommended for this range
of cylinders.
3.7 A re-circulation circuit can be installed on the sanitary water circuit. A connection is provided for the
re-circulation circuit return pipe (threaded G1” female). This connection is supplied with a blanking
plug tted which should be removed before connecting the re-circulation circuit return pipe (see
diagram 4, page 5).
3.8 The primary heating circuit MUST be fully pumped.
3.9 The connections to the primary ow and primary return are G1” female.
Diagram 3
Primary Flow
Primary Return
Balanced cold
water connection
Pressure relief
valve
Pressure reducing
valve
Mains water
Supply
Discharge Pipe
Drain cock
Tundish
To hot outlets
Inlet water supply
Boiler thermostatic
controls
Immersion Heater
Temperature & pressure
relief valve

6
Diagram 4
4. ELECTRICAL REQUIREMENTS
4.1 The BAXI Premier Plus water heater is suitable for use with most gas or oil red boilers provided
the boiler has adequate thermostatic control and over-temperature protection. If in doubt consult
the boiler manufacturer.
4.2 The primary ow from the boiler MUST be pumped. Gravity circulation will not work due to the
special design of the primary heat exchanger. It is recommended that an air bleed point or
automatic air vent is incorporated into the highest point in the system.
4.3 The water heater is tted with a control thermostat suitable for the control of the sanitary water
storage temperature. This thermostat should be connected, via the terminal block provided, to the
primary heating circuit controls. See diagrams 5 and 6, page 6 for wiring information
4.4 The electrical cable should enter the terminal cover via one of the cable grips provided. The outer
sheath of the cable should be secured by the cable grip. Connection to the terminal block will
depend on the primary control arrangement. Suggested arrangements are shown in diagrams 7,
8,and 9, pages 6 and 7.
Primary Flow
Primary Return
Drain valve
To hot outlets
Inlet water supply
Check valve
Secondary return
Secondary circulation
pump

7
Diagram 7
1 2 3C 2
High limit
thermostat
Control
thermostat
Common
(S/L)
Load (Demand Contact)
Satised
C
0
30
40
50
60
70
°C
Temperature
Adjustment
Thermal cut-out
reset under screw
head
Diagram 5
Diagram 6
Ph NCH
ON DHW ON
PROGRAMMER
1 2 3
M
1 2 3
M
Ph NPh N
Ph
N
INDIRECT THERMOSTAT
AND THERMAL CUT-OUT 2 PORT ZONE VALVE
DHW HEAT EXCHANGER
ROOM THERMOSTAT 2 PORT ZONE VALVE
PRIMARY CH CIRCUIT BOILER PUMP
2 x 2 PORT ZONE
VALVE SYSTEM
123 4 5678910
ELECTRICAL
SUPPLY
WIRING CENTRE
NOTE: THE EARTH CONNECTIONS HAVE BEEN OMITTED
FOR CLARITY. ALL EARTH CONNECTIONS MUST BE
LINKED BACK TO THE EARTH TERMINALS IN THE WIRING
CENTRE

8
Diagram 8
Diagram 9
Ph NCH
ON DHW ON
PROGRAMMER
1 2 3
Ph
N
INDIRECT THERMOSTAT
AND THERMAL CUT-OUT
ROOM THERMOSTAT 3 PORT MID POSITION
VALVE BOILER PUMP
3 PORT MID POSITION
VALVE SYSTEM
123 4 5678910
ELECTRICAL
SUPPLY
WIRING CENTRE
NOTE: THE EARTH CONNECTIONS HAVE BEEN OMITTED
FOR CLARITY. ALL EARTH CONNECTIONS MUST BE
LINKED BACK TO THE EARTH TERMINALS IN THE WIRING
CENTRE
CV PUMP
1 2 3LNLN
DHW
OFF
1 2
Ph
N
INDIRECT THERMOSTAT
AND THERMAL CUT-OUT
ROOM THERMOSTAT 3 PORT VALVE
(HOT WATER PRIORITY) BOILER
3 PORT VALVE SYSTEM
(HOT WATER PRIORITY)
123 4 5678910
ELECTRICAL
SUPPLY
WIRING CENTRE
NOTE: THE EARTH CONNECTIONS HAVE BEEN OMITTED
FOR CLARITY. ALL EARTH CONNECTIONS MUST BE
LINKED BACK TO THE EARTH TERMINALS IN THE WIRING
CENTRE
23LNLN
3
PUMP
M
Ph NCH
ON DHW ON
PROGRAMMER
DHW
OFF

9
5. IMMERSION HEATER - ELECTRICAL
REQUIREMENTS
Note: At the time of installation the Cylinder is tted with a blank immersion boss and cover. A 3kW
immersion is available as an accessory, 95 602 030, page 14
5.1 If the water heater is tted with a supplementary immersion heater it will incorporate a
thermostatic control and over-temperature cut-out. The immersion heater is rated 3kW @ 240V
/2.8kW @ 230V , single phase.
5.2 The immersion heater is located behind the silver metal cover on the front of the water heater. The
cover is secured by a screw on the front.
DISCONNECT THE ELECTRICAL SUPPLY BEFORE REMOVING THE COVER.
5.3 The immersion heater MUST be earthed.
5.4 All electrical wiring should be carried out by a competent electrician and be in accordance with the
latest national Wiring Regulations. The circuit must be protected by a suitable fuse and double pole
isolating switch with a contact separation of at least 3mm in both poles.
5.5 The immersion heater should be wired in accordance with diagram 10, page 9. The supply cable
must be routed through the cable gland provided and the outer sheath of the cable rmly secured
by tightening the screw on the cable gland. Always replace the cover before operating.
5.6 DO NOT operate the immersion heater until the water heater has been lled with water.
5.7 It is recommended that the immersion heater thermostat is set to between position 4 and 5
(60 to 65oC), however it can be set between 1 and 5 (10o and 70oC). To adjust the temperature
insert a at bladed screwdriver into the adjustment knob and rotate, clockwise to decrease the
temperature, counter-clockwise to increase the temperature.
5.8 The thermostat incorporates an over-temperature thermal cut-out that will switch off the immersion
heater in the event of a thermostat failure. The thermal cut-out reset button is indicated on diagram
11, page 9. DO NOT bypass the thermal cut-out in any circumstances.

10
1
2
3
4
5
Brown Blue
Green/Yellow
Thermostat
Earth Post
Fused (13A) double
pole isolating switch
1.5mm² 3 core
HOFR sheathed
cable
230V ~ MONOPHASE
Diagram 10
1
2
3
4
5
Thermal cut-out
reset button
Temperature
adjustment
Customer
earthing
terminal
Thermostat
L
N
E
Diagram 11

11
6. COMMISSIONING
6.1 DO NOT switch on either the immersion heater or boiler until the water heater has been lled with
water and checked for leaks.
6.2 Check that all installation, electrical and discharge pipe requirements have been met.
6.3 Check that all water and electrical connections are correctly made and are tight.
6.4 Open a hot tap supplied by the water heater, turn on the cold water supply to the water heater.
6.5 Allow the water heater to ll and leave the hot tap running for a short while to purge any air and
ush out the pipe work. Close the hot tap.
6.6 Open successive hot taps to purge any air from the system.
6.7 With all hot taps closed, check the system for water leaks and rectify as necessary.
6.8 Manually test the operation of the pressure relief valve. Ensure water ows freely from the valve
and through the discharge pipe.
6.9 Fill the primary circuit following the boiler manufacturers commissioning instructions. If motorised
valves are used to control the primary ow ensure these are set to the manual open position for
commissioning. When the primary circuit is full return the motorised valves to the AUTO position.
Vent any trapped air by opening the air bleed point or automatic air vent.
6.10 For heating by immersion heater, switch on the electrical supply to the water heater and allow the
water heater to heat. The thermostat is factory set to control the storage temperature to approx.
60oC. If necessary the temperature can be adjusted by inserting a at bladed screwdriver in the
adjustment knob on top of the immersion heater thermostat and rotating (see diagram 11, page 9).
The adjustment range 1 to 5 represents a temperature range of 10o to 70oC. DISCONNECT THE
ELECTRICAL SUPPLY before making any adjustments.
6.11 For heating by indirect heat exchanger switch on the electrical supply to the boiler and ensure the
programmer is set to HOT WATER mode. Check that any motorised valves or primary pumps are
working and allow the water heater to heat. The indirect control thermostat is factory set to give a
storage temperature of approx. 60oC. If necessary the temperature can be adjusted by rotating the
knob on the front of the control box, see diagram 6, page 6.
7. MAINTENANCE - DESCALING
IMMERSION HEATER (IF FITTED)
7.1 Little maintenance is required, however in hard water areas the water heater will require periodic
de-scaling to ensure efcient operation. To de-scale the water heater immersion (if tted):
7.2 Switch off and disconnect the electrical supply and shut down the boiler (indirect water heaters).
Turn off the water supply to the water heater.
7.3 Open a hot tap served by the water heater to relieve any system pressure. Empty the water heater
by opening the drain valve in the inlet pipe work.
7.4 Open the terminal cover and disconnect wiring from the immersion heater thermostat. Remove the
immersion heater thermostat by carefully pulling outwards from the immersion heater.
7.5 Unscrew immersion heater. Remove the immersion heater from the water heater. NOTE over time
the immersion heater seal may degrade and it is good practice to replace it when servicing the unit.
7.6 Carefully remove any scale from the surface of the element. DO NOT use a sharp implement as
damage to the element surface could be caused.
7.7 Ensure sealing surfaces are clean and seals are undamaged. If in doubt t a new seal.
7.8 Replace immersion heater by screwing into the immersion boss, take care not to over tighten.

12
7.9 Replace the immersion heater thermostat by carefully plugging the two male spade terminations on
the underside of the thermostat head into the corresponding terminations on the element. Ensure
the thermostat is pushed fully home.
7.10 Rewire the immersion heater in accordance with diagram 10, page 9. Ret and secure the
terminal cover.
7.11 DO NOT SWITCH ON EITHER THE BOILER OR IMMERSION HEATER UNTIL THE WATER
HEATER HAS BEEN RE-FILLED WITH WATER.
Re-commission the water heater following the Installation and commissioning instructions.
8. MAINTENANCE - DESCALING
THE WATER HEATER
8.1 Switch off and disconnect the electrical supply and shut down the boiler (indirect water heaters). Turn
off the water supply to the water heater.
8.2 Open a hot tap served by the water heater to relieve any system pressure. Empty the water heater
by opening the drain valve in the inlet pipe work.
8.3 Remove the terminal cover and disconnect wiring from the immersion heater thermostat. Remove the
immersion heater thermostat by carefully pulling outwards from the immersion heater.
8.4 Unscrew immersion heater. NOTE over time the immersion heater seal may become stuck to the
mating surface, if the seal is damaged replace with new one.
8.5 The loose scale in the base of the water heater can be removed by inserting the suction hose on a
“wet and dry” vacuum cleaner and sucking the scale out of the water heater.
8.6 Replace immersion heater by screwing into the immersion boss, take care not to over tighten.
8.7 Replace the immersion heater thermostat by carefully plugging the two male spade terminations on
the underside of the thermostat head into the corresponding terminations on the element.
8.8 Rewire the immersion heater in accordance with diagram 9, page 9. Close and secure the terminal
cover.
8.9 DO NOT SWITCH ON EITHER THE BOILER OR IMMERSION HEATER UNTIL THE WATER
HEATER HAS BEEN RE-FILLED WITH WATER. Re-commission the water heater following the
Installation and commissioning instructions.

13
9. MAINTENANCE - SAFETY VALVES
9.1 The Pressure Relief valve and any other safety valves tted should be regularly checked for correct
operation.
9.2 Manually operate the valve(s) and ensure that water ows freely from the valve and through the
discharge pipe. NOTE the water discharged may be very hot. Ensure the valve re-seats correctly
when released.
10. USER INSTRUCTIONS
10.1 The BAXI Premier Plus water heater stores water at the temperature set on the adjustable
thermostat. This is factory set to give a storage temperature of approx. 60oC. However, this can be
set to give temperatures in the range 10o to 70oC. The adjustable thermostat is located on the front of
the cylinder, see diagram 3, page 4.
10.2 To avoid any risk of freezing when the water heater is not in use for long periods during the
winter months, do not switch off the boiler or immersion heater and set the control thermostat to its
minimum position. NOTE this will not protect other parts of the system pipe work.
10.3 To ensure the water heater continues to operate at its optimum performance it should periodically
be maintained in accordance with the instructions given under the sections headed MAINTENANCE.
10.4 IMPORTANT NOTES TO THE USER
• Do not block or restrict the discharge from any safety valve tted
• Do not tamper with any safety valve tted
• Do not bypass the thermal cut-outs in any circumstances
• If a fault is suspected contact a qualied engineer to check the system
11. GUARANTEE
11.1 This water heater is guaranteed for a period of 10 years from the date of purchase with the
exception of the thermal controls which are guaranteed for a period of two years provided:
11.2 The water heater has been installed in accordance with these instructions and all necessary inlet
controls and safety valves have been tted correctly.
11.3 Any valves or controls are of the manufacturers recommended type.
11.4 The water heater has not been tampered with and has been regularly maintained as detailed in
these instructions.
11.5 The water heater has been used only for heating potable water.
11.6 The water heater is NOT guaranteed against damage by frost or due to build up of scale.
11.7 This guarantee does not affect the statutory rights of the consumer.

14
12. SPARE PARTS
12.1 The following list of spare parts is available for the BAXI Premier Plus water heater. Refer to the
technical data label on the water heater to identify the model installed and to ensure the correct
parts are ordered.
12.2 DO NOT replace with parts not recommended by the manufacturer as this will invalidate your
guarantee and may render the installation dangerous.
Description Part no.
3kW Immersion heater (1 3/4” screw thread) 95:602:030
3/4” Temperature/pressure relief valve 95:605:103
13. ENVIRONMENTAL INFORMATION
13.1 This water heater is manufactured from many recyclable materials. At the end of its useful life it
should be disposed of at an approved Recycling Centre to realise the full environmental benets.
13.2 The insulation material is CFC/HCFC free expanded polyurethane foam with an ozone depletion
factor of zero.

15
The pace of product development is such that we reserve the right to change
product specications without notice. We do, however, strive to ensure that all
information in this leaet is accurate at the time of publication.
Notes:

16
Baxi Heating UK Ltd - Heatrae Sadia Heating
Trading Division
Hurricane Way
Norwich NR6 6EA
England
www.heatraesadia.com
A BDR Thermea company 36006191_issue_04