Estia HWS-1501CSHM3-UK, HWS-2101CSHM3-UK, HWS-3001CSHM3-UK Installation And Service Manual
1
AIR TO WATER HEAT PUMP SYSTEM
HOT WATER CYLINDER
INDIRECT HEATING METHOD
CLOSED OUTLET (UNVENTED)
INSTALLATION AND SERVICE MANUAL
36006030_Issue_H
HWS-1501CSHM3-UK
HWS-2101CSHM3-UK
HWS-3001CSHM3-UK
2
INSTALLATION AND SERVICING INSTRUCTIONS, FOR AIR TO WATER HEAT
PUMP SYSTEM WATER CYLINDER. PLEASE LEAVE THIS MANUAL WITH THE
UNIT FOR FUTURE REFERENCE.
CONTENTS
SECTION CONTENT PAGE
1 INTRODUCTION . . . . . . . 2
2 GENERAL REQUIREMENTS . . . . . . 3
3 INSTALLATION - GENERAL . . . . . . 4
4 INSTALLATION – INDIRECT UNITS . . . . . 9
5 COMMISSIONING . . . . . . . 9
6 MAINTENANCE . . . . . . . 10
7 FAULT FINDING AND SERVICING . . . . . 11
8 USER INSTRUCTIONS . . . . . . 13
9 GUARANTEE . . . . . . . . 14
1.0 INTRODUCTION
IMPORTANT: THIS APPLIANCE IS NOT
INTENDED FOR THE USE BY PERSONS
(INCLUDING CHILDREN) WITH REDUCED
PHYSICAL, SENSORY OR MENTAL CAPABILITIES, OR LACK OF KNOWLEDGE AND EXPERIENCE, UNLESS THEY HAVE BEEN GIVEN
SUPERVISION OR INSTRUCTION CONCERNING THE USE OF THE APPLIANCE BY A PERSON RESPONSIBLE FOR THEIR SAFETY.
This unit, for use with the ESTIA air to water heat
pump system, is a purpose designed unvented water
cylinder. The unit has a stainless steel inner vessel
which ensures an excellent standard of corrosion resistance. The outer casing is a combination of resilient
thermoplastic mouldings and plastic coated corrosion
proofed steel sheet.
NOTE: Prior to installation the unit should be stored
in an upright position in an area free from excessive
damp or humidity.
The unit is supplied complete with all the necessary
safety and control devices needed to allow connection to the cold water mains. All these components
are pre-adjusted.
This appliance complies with the requirements of the
CE marking directive and is KIWA approved to show
compliance with Building Regulations (Section G3)
and UK Water Regulations.
The following instructions are offered as a guide to
installation which must be carried out by a competent
plumbing and electrical installer in accordance with
Building Regulation G3, The Building Standards
(Scotland) Regulations Section 4 standard 4.9, or
The Building Regulations (Northern Ireland) Part P
Section P5.
IMPORTANT: PLEASE READ ALL THESE INSTRUCTIONS BEFORE
COMMENCING INSTALLATION
Maximum water supply pressure to PRV 1.6MPa (16.0 bar)
Operating pressure of unit 0.35MPa (3.5 bar)
Expansion vessel charge pressure 0.35MPa (3.5 bar)
Expansion valve setting 0.6MPa (6.0 bar)
Nominal storage capacity of units (see Table 2)
Max. primary working pressure 0.3MPa (3.0 bar)
Opening temperature of T&P Relief Valve 90deg C
Opening pressure of T&P Relief Valve 1.0 MPa (10 bar)
Table 1: Operational Summary
3
2.0 GENERAL REQUIREMENTS
2.1 COMPONENTS SUPPLIED
1. Unvented water cylinder incorporating
cylinder heater and thermal controls
2. Factory tted Temperature/Pressure Relief Valve
3. T&P Valve insulation and housing.
4. Cold Water Combination Valve.
5. Expansion Vessel and mounting bracket.
6. Tundish.
7. Compression nuts and olives
8. Cylinder heater key spanner
2.2 SITING THE UNIT
The unit must be installed vertically. Although location is not critical, the following points should be
considered:
• The unit should be sited to ensure minimum dead
leg distances, particularly to the point of most frequent
use.
• Avoid siting where extreme cold temperatures
will be experienced. All exposed pipework should be
insulated.
• The discharge pipework from the safety valves
must have minimum fall of 1:200 from the unit and
terminate in a safe and visible position.
• Access to associated controls and cylinder heater
should be possible to allow for periodic servicing and
maintenance.
• Ensure that the base chosen for the unit is level
and capable of permanently supporting the weight
when full of water (see Table 2).
2.3 WATER SUPPLY
Bear in mind that the mains water supply to the
property will be supplying both the hot and cold water requirements simultaneously. It is recommended
that the maximum water demand is assessed and the
water supply checked to ensure this demand can be
satisfactorily met.
NOTE: A high mains water pressure will not always
guarantee high ow rates.
Wherever possible the mains supply pipe should be
22mm. We suggest the minimum supply requirements
should be 0.15MPa (1.5 bar) pressure and 20 litres
per minute owrate. However, at these values outlet
owrates may be poor if several outlets are used si-
multaneously. The higher the available pressure and
owrate the better the system performance.
The unit has an operating pressure of 0.35MPa (3.5
bar) that is controlled by the Cold Water Combination
Valve. The Cold Water Combination Valve can be
connected to a maximum mains pressure of 1.6MPa
(16 bar).
2.4 OUTLET/TERMINAL FITTINGS (TAPS, ETC.)
The unit can be used with most types of terminal ttings. It is advantageous in many mixer showers to
have balanced hot and cold water supplies. In these
instances a balanced pressure cold water connection
should be placed between the Cold Water Combination
Valve and the water cylinder. Outlets situated higher
than the unit will give outlet pressures lower than that
at the cylinder, a 10m height difference will result in a
0.1MPa (1 bar) pressure reduction at the outlet.
2.5 LIMITATIONS
The unvented water cylinder should not be used in
association with any of the following:
• Ascending spray type bidets or any other class 1
back syphonage risk requiring that a type A air gap
be employed.
• Situations where maintenance is likely to be
neglected or safety devices tampered with.
• Water supplies that have either inadequate pres-
sure or where the supply may be intermittent.
• Situations where it is not possible to safely pipe
away any discharge from the safety valves.
• In areas where the water consistently contains a
high proportion of solids, e.g. suspended matter that
could block the strainer, unless adequate ltration can
be ensured.
Table 3: Standing heat losses
Table 2: Unit weights
Based on an ambient air temperature of 20oC and a
stored water temperature of 65oC
Nominal
capac ity
(litres )
W eight of
unit full
(kg)
HWS-1501CSHM3-UK
150
210
300
HWS-2101CSHM3-UK
HWS-3001CSHM3-UK
181
251
360
Model
Nom ina l
ca pa ci ty pe r d a y pe r ye a r
(litres ) (kW h/ 24h) (kW h/365d)
150 1.45 529 . 3
210 1.91 697.2
300 2.52 919.8
Sta nding He a t L oss
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3.0 INSTALLATION – GENERAL
3.1 PIPE FITTINGS
All pipe ttings are made via 22mm compression
ttings directly to the unit. The ttings are threaded
3/4”BSP male parallel should threaded pipe connec-
tions be required.
3.2 COLD FEED
A 22mm cold water supply is recommended however,
if a 15mm (1/2”) supply exists which provides sufcient ow this may be used (although more ow
noise may be experienced).
A stopcock or servicing valve should be incorporated
into the cold water supply to enable the unit and its
associated controls to be isolated and serviced.
3.3 COLD WATER COMBINATION VALVE (FIG 1)
The Cold Water Combination Valve can be connected
anywhere on the cold water mains supply prior to the
Expansion Vessel (see Fig. 5). The Cold Water Combination Valve is installed as a complete one-piece
unit. The valve incorporates the Pressure Reducer,
Strainer, Expansion Valve and Check Valve. Ensure
that the valve is installed with the direction of ow
arrows pointing in the right direction. No other valves
should be placed between the Cold Water Combination
Valve and the unit. The Expansion Valve connection
must not be used for any other purpose.
FIG. 1 Cold Water Combination Valve
FIG. 2 Secondary circulation connection
3.4 DRAIN TAP
A suitable draining tap should be installed in the
cold water supply to the unit between the Cold Water
Combination Valve and the cylinder at as low a level
as possible. It is recommended that the outlet point of
the drain pipework be at least 1 metre below the level
of the cylinder (this can be achieved by attaching a
hose to the drain tap outlet spigot).
3.5 EXPANSION VESSEL
The Expansion Vessel accommodates expansion that
results from heating the water inside the unit. The unit
is pre-charged at 0.35MPa (3.5 bar). The Expansion
Vessel must be connected between the Cold Water
Combination Valve and the water cylinder (see Fig.
5). The location of the Expansion Vessel should
allow access to recharge the pressure as and when
necessary, this can be done using a normal car foot
pump. It is recommended that the Expansion Vessel
is adequately supported. An Expansion Vessel wall
mounting bracket is supplied for this purpose
3.6 SECONDARY CIRCULATION
If secondary circulation is required it is recommended
that it be connected to the cylinder as shown in Fig. 2
via a swept tee joint into the cold feed to the unit.
The secondary return pipe should be in 15mm pipe
and incorporate a check valve to prevent backow. A
suitable WRAS approved bronze circulation pump
will be required. On large systems, due to the increase
in system water content, it may be necessary to t an
additional expansion vessel to the secondary circuit.
this should be done if the capacity of the secondary
circuit exceeds 10 litres.
Pipe capacity (copper)
15mm o/d = 0.13 l/m (10 litres = 77m)
22mm o/d = 0.38 l/m (10 litres = 26m)
28mm o/d = 0.55 l/m (10 litres = 18m)
3.7 OUTLET
The hot water outlet is a 22mm compression tting
located at the top of the cylinder. Hot water distribution pipework should be 22mm pipe with short runs
of 15mm pipe to terminal ttings such as sinks and
basins. Pipe sizes may vary due to system design.
EXPANSION VALVE
COLD MAINS
CONNECTION
(22mm)
EXPANSION VALVE
OUTLET (15mm)
OUTLET
CONNECTION
(22mm)
PRESSURE
REDUCING
VALVE
HOUSING
PRESSURE
REDUCING
VALVE
CARTRIDGE (3.5 bar)
COLD
INLET
CONNECTION
COLD
SUPPLY
CHECK
VALVE
SECONDARY
RETURN
SECONDARY
CIRCULATION
PUMP
SWEPT
TEE
5
FIG. 3 General Dimensions and Performance
NOMINAL CAPACITY(litres)
A (mm)
B (mm)
C (mm)
D (mm)
SURFACEAREA (sq.m)
HOTWATER OUTPUT AT60ºC (litres)
MIXED HOTWATEROUTPUT AT40ºC(litres)
HEATLOSS (kWh/24h)
HEATING TIME 15ºC TO60ºC- USINGELECTRIC
CYLINDER HEATER ONLY(mins)
CAPACITYHEATED USINGELECTRIC
CYLINDER HEATER ONLY(litres)
150 210 300
315 315 315
354 354 354
800 1184 1474
1090 1474 2040
0.65 0.79 0.79
102 163 254
243 329.5 476
1.45 1.91 2.52
123 188 262
102 163 254
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