Aqualisa Midas User manual

Midas
Thermostatic exposed shower valve
and bath/shower mixer systems
Installation guide

2

Index
Introduction p.4
- Safety information p.4
- Product specification p.4
Connection to supplies p.4
- lushing p.5
- ilters p.5
- Isolating valves p.5
- Pressures p.5
Gravity system p.5
- Siting p.6
- Pump installation p.6
- Stored water capacities p.6
Balanced high pressure systems p.6
Combination boiler systems p.6
Typical water systems p.7
System components p.9
Valve installation instructions p.11
- Midas range exposed valves p.11
- Midas range bath/shower mixer p.12
Shower head installation p.15
- Midas 100 head p.15
- Midas 200 head p.17
User guide - Shower controls p.19
- Midas range exposed valve p.19
- Midas range bath/shower mixer p.19
User guide - Shower head p.20
- Adjustable height heads p.20
Cleaning & maintenance p.20
Commissioning p.21
Trouble shooting guide p.22
Guarantee terms and conditions p.23
3

4
Introduction
The Midas product range is available as either exposed shower valve systems or exposed bath/shower mixer systems
complete with adjustable height heads. All shower heads feature variable spray patterns. Midas thermostatic valves
provide close temperature stability and fail safe protection on appropriate high and low pressure systems.
The Midas 100 range is suitable for use on high pressure and combination boiler systems.
The Midas 200 features a specific low pressure exposed valve for use on gravity systems and an exposed valve and
bath/shower mixer suitable for use on high pressure and combination boiler systems. Please refer to the product
specification section below.
This Midas product range is supplied with a 2 year parts and labour and a further 3 year parts only guarantee. In
the event of any product problems, please contact the Aqualisa customer helpline on 01959 560010 for assistance.
Please refer to our terms of guarantee on page 23.
Safety information
This product must be installed by a competent person in accordance with all relevant current Water Supply
Regulations.
The Midas range is designed for domestic use only.
Product specification
Midas 100 shower valve and Midas 100 bath/shower mixer, product is suitable for balanced high pressure
systems e.g. unvented storage and combination boilers only. Pressure range 1.0* – 10.0 bar max (static).
Midas 200 low pressure shower valve, product is suitable for gravity stored systems only. Pressure range 0.1 – 1.0 bar
max (static).
Midas 200 high pressure shower valve, and Midas 200 bath/shower mixer, product is suitable for balanced high
pressure and combination boiler systems. Pressure range 1.0* – 10.0 bar max (static).
* The combination boiler MUST have a minimum rating of 24kW (80,000 Btu) and be of the type fitted with a fully
modulating gas valve.
If in any doubt, please contact the appliance manufacturer before installation commences.
When fitted to combination boiler systems, Midas exposed shower valves have been designed to give optimum
temperature control and stability from fully modulating combination boilers and instantaneous gas water heaters.
The Midas high pressure exposed shower valves are supplied complete with flow regulators to control the incoming hot
water flow rate into the cartridge. The following regulators should be fitted to suit the relevant rated appliance as listed
below:
YE OW = 24kW (80,000 Btu) boiler
GREEN = 28kW (100,000 Btu) boiler
B UE = 35+kW (120,000+Btu) boiler
Please refer to page 12 for fitting the regulator instructions.
N.B. The inlet flow regulators are not recommended for use with Midas bath/shower mixer valves.
Connections
The Midas product range is designed for conventional supplies with HOT on the Left and COLD on the Right as
viewed from the front.
Supply lines must be flushed clear of any debris before installation of the unit. Any debris accumulation in the
shower valve and head may result in damage and poor performance.
Important information

5
Flushing
Some modern fluxes can be extremely corrosive and, if left in contact, will attack the working parts of this unit.
All soldering must be completed and the pipe work thoroughly flushed out in accordance with current Water Supply
Regulations prior to connection of the product.
Filters
To ensure optimum ongoing performance, the Midas product range is protected by inlet filter assemblies in the
internal waterways. Debris accumulation may result in progressively reduced flow through the showerhead and
noisy operation.
As this condition is not covered by our standard warranty terms, it is suggested that the cartridge be removed and
the filters checked by a competent person at least every 12 months. In the event of any difficulties please contact
the Aqualisa customer helpline for assistance.
Isolating valves
Suitable full way isolation valves must be fitted to both supplies in accordance with current Water Supply
Regulations and our terms of warranty.
Due to their restrictive characteristics, stopcocks and ball type valves that reduce the pipe bore size must not be
used on gravity or pumped installations.
Pressures
The Midas product range is designed to control static pressure up to 10 bar. Where pressures are likely to exceed
10 bar, a pressure reducing valve (PRV) must be fitted into the incoming mains supply. A setting of 3 bar is
recommended. It should be noted that daytime pressures approaching 8 bar can rise above the stated maximum
overnight.
A suitable PRV is available from Aqualisa.
The Midas product range is not suitable for mixed supply systems, e.g. gravity hot and mains cold.
Gravity fed hot and cold supplies
The specific low pressure Midas 200 shower valve is suitable for use with gravity systems.
Services must be installed according to good plumbing practice having regard to pipe sizing, long pipe runs and
low-head situations.
The cold supply for the valve assembly must be taken directly from the cold storage system. The hot supply may be
taken from the vent/draw off pipe of the hot water cylinder at a point below the cylinder connection or alternatively
from the underside of the horizontal draw off.
Rising pipe work must not be connected into the horizontal draw-off from the cylinder or to any point in the
vent/draw off pipe above the cylinder connection.
CY INDER TEMPERATURE IN EXCESS OF 65ºC MAY RESU T IN POOR SHOWER PERFORMANCE.
To minimise pressure loss we recommend that the hot and cold supplies are run in 22mm as close as reasonably
possible to the mixing valve before reducing to 15mm to suit the intended inlet connection fittings.

6
Siting
or optimum performance, with gravity fed systems, the distance between the bottom of the storage cistern and
the shower head should not be less than 1m (when using an adjustable height shower kit). Please refer to the
system layouts on page 7.
Pump installation
UNDER NO CIRCUMSTANCES MUST A PUMP BE FITTED DIRECT Y TO THE WATER MAIN.
A pump must only be used to boost the pressure from tank-fed supplies. A typical layout is shown on page 7.
Stored water capacities
The minimum capacity of the cold storage cistern should not be less than 225 litres (50 gallons). The capacity of the
hot cylinder must be capable of meeting the anticipated demand.
Balanced high-pressure system
The Midas high pressure product range is designed to operate with unvented hot water storage systems up to a
maximum pressure of 10 bar. The cold water supply must be drawn from the same mains supply as that to the hot
water system (down stream of the cylinder manufacturers pressure limiting valve, where supplied) and the hot
supply from the nearest convenient draw off point. Account must be taken of pressure drops that may occur when
other draw-off points are used while the shower is in use. A typical layout is shown on page 8.
Combination boiler/multipoint system
The Midas high pressure product range is suitable for use with combination boiler systems. The combination boiler
MUST have a minimum rating of 24kW (80,000 Btu) and be of the type fitted with a fully modulating gas valve.
This is sufficient to operate one outlet point at a time. The Midas cartridge is designed to operate from the mains at
a maximum of 10 bar. If the mains pressure exceeds 10 bar a ‘drop tight’ PRV must be fitted on the supply pipe
after the main stopcock.
If in any doubt, please contact the appliance manufacturer before installation commences.
The cold supply can be taken from the nearest convenient mains supply and the hot supply can be taken from the
nearest hot water draw-off point. Account must be taken of the pressure drops that will occur when other draw-off
points are used while the shower is in use. A typical layout is shown on page 8.
When fitted to combination boiler systems, Midas exposed shower valves have been designed to give optimum
temperature control and stability from fully modulating combination boilers and instantaneous gas water heaters.
The Midas high pressure exposed shower valves are supplied complete with flow regulators to control the incoming hot
water flow rate into the cartridge. The following regulators should be fitted to suit the relevant rated appliance as listed
below:
YE OW = 24kW (80,000 Btu) boiler
GREEN = 28kW (100,000 Btu) boiler
B UE = 35+kW (120,000+Btu) boiler
Please refer to page 12 for fitting the regulator instructions.
N.B. The inlet flow regulators are not recommended for use with Midas bath/shower mixer valves.

7
Typical system diagrams
Typical pumped system installation
(suitable for use with the Midas 200 low pressure shower valve)
Typical gravity system installation
(suitable for use with the Midas 200 low pressure shower valve)

8
Typical system diagrams continued
Typical combination boiler system installation
(suitable for use the Midas high pressure product range)
Typical thermal storage unit system installation
(suitable for use with the Midas high pressure product range)
Typical UHW system installation
(suitable for use the Midas high pressure product range)

9
Components - Midas 100
low regulators
for use with
combination
boilers
Exposed shower valve with adjustable height head
Bath/shower mixer with adjustable height head

10
Components - Midas 200
low regulators for use
with combination boilers
Exposed shower valve with adjustable height head
Bath/shower mixer with adjustable height head
low regulators for use
with combination
boilers

Midas exposed valves
!In addition to the guide below it is essential that the written instructions overleaf are read and understood and that
you have all the necessary components (shown on pages 9 & 10) before commencing installation. Failure to install
the product in accordance with these instructions may adversely affect the warranty terms and conditions. Do not
undertake any part of this installation unless you are competent to do so. Prior to starting, ensure that you are
familiar with the necessary plumbing regulations required to install the product correctly and safely.
1
Eccentric elbows are provided to allow for inlet pipework adjustment between 140mm – 160mm centres. Construct suitable
connections terminating in ½”BSP female fittings.
2
If required, apply jointing tape to the threads and fit the eccentric elbow
connectors sufficiently to achieve a water tight seal, terminating at 150mm
centres to suit the exposed valve inlets.
!A first fix easy fit fixing bracket is available separately, product code MD300E B,
designed for ease of installation. If required, fit the easy fit bracket following the
installation instruction sheet supplied with the bracket and proceed to step 6 overleaf.
The exposed valve and fixing bracket assembly MUST NOT be used as a grab rail
support method.
3Ensuring adequate provision to allow the water to discharge safely to waste, turn on the supplies to flush the system
through. Attach pressure test equipment and pressure test the system in accordance with Water Supply Regulations.
4Ensure the ¾” supply connections are temporarily capped to prevent any dirt of dust ingress into the pipe work during the
making good process. Remove the caps prior to connecting the shower valve.
5Apply a thin bead of mastic to the rear of the cover plates. Place the cover plates onto the exposed
¾” threads, flush with the finished wall surface.
11

12
6If the valve is being installed for use with a gas fired instantaneous (multipoint) water heater or a combination boiler,
a flow regulator should be fitted to the hot water inlet. The inlet flow regulators are supplied as part of the system
components and should be fitted to suit the relevant rated appliance as listed below:
YE OW = 24kW (80,000 Btu) boiler
GREEN = 28kW (100,000 Btu) boiler
B UE = 35+kW (120,000+ Btu) boiler
8Ensuring the fibre washers are positioned within the valve inlets, offer the valve into position.
Tighten the fixing nuts using a suitable tool taking care not to overtighten.
9Attach the hose to the valve hose outlet to allow the water to discharge safely to waste.
Turn on the supplies to the shower and turn the shower on to flush the system through.
Turn off the shower.
If required, refer to the commissioning instructions on page 21 to adjust the maximum temperature override button position.
ollow the shower head system installation instructions on pages 15 to 18 to complete the installation.
Midas bath/shower mixers - wall mount installation
!In addition to the guide below it is essential that the written instructions overleaf are read and understood and that
you have all the necessary components (shown on pages 9 & 10) before commencing installation. Failure to install
the product in accordance with these instructions may adversely affect the warranty terms and conditions. Do not
undertake any part of this installation unless you are competent to do so. Prior to starting, ensure that you are
familiar with the necessary plumbing regulations required to install the product correctly and safely.
7The Midas high pressure product range is supplied complete with 2 hot inlet flow regulator
housings. The smaller housing is suitable for use with the Aqualisa easy fit fixing bracket and the
larger housing is suitable for use with conventional inlet connections e.g. eccentric elbow
connections. it the relevant sized regulator into the correct sized housing and place into the hot
inlet pipe work connection ensuring the flow regulator O’ring faces the incoming flow.
!A first fix easy fit fixing bracket is available separately, product code MD300E B,
designed for ease of installation. If required, fit the easy fit bracket following the
installation instruction sheet supplied with the bracket and proceed to step 5 overleaf.
The exposed valve and fixing bracket assembly MUST NOT be used as a grab rail
support method.

13
1Construct suitable connections at 150mm centres terminating in ¾” BSP male threads.
2Ensuring adequate provision to allow the water to discharge safely to waste, turn on the supplies to flush the system
through. Attach pressure test equipment and pressure test the system in accordance with Water Supply Regulations.
3Ensure the ¾” supply connections are temporarily capped to prevent any dirt of dust ingress into the pipe work during the
making good process. Remove the caps prior to connecting the shower valve.
4Inlet pipe cover plates are available separately from Aqualisa customer services or complete with
the easy fit fixing bracket. If required, apply a thin bead of mastic to the rear of the cover plates.
Place the cover plates onto the exposed ¾” threads flush with the finished wall surface.
5Ensuring the fibre washers are positioned within the valve inlets, offer the valve into position.
Tighten the fixing nuts using a suitable tool taking care not to overtighten.
6Turn on the supplies to the bath/shower mixer and turn the flow control knob on to flush the
system through. Turn off the bath/shower mixer.
If required, refer to the commissioning instructions on page 21 to adjust the maximum temperature override button position.
ollow the shower head system installation instructions on pages 15 to 18 to complete the installation.

14
The Midas range bath/shower mixers feature inlet pipe centres of 150mm. However deck mount adaptors are provided to
allow installation to baths at standard 180mm centres.
1Ensuring the fibre washers are fitted within the valve inlets, attach the deck mount adaptors to
the bath/shower mixer. Tighten the connections using a suitable tool, taking care not to
overtighten.
2Place the rubber washers onto the tap tails and offer the assembly into position onto the bath.
3Place the back nuts onto the tap tails and secure the assembly to the underside of the bath.
Deck mount installation
5Turn on the supplies to the bath/shower mixer and turn the flow control knob on to flush the system through. Turn off
the bath/shower mixer.
If required, refer to the commissioning instructions on page 21 to adjust the maximum temperature override button position.
ollow the shower head system installation instructions on pages 15 to 18 to complete the installation.
4Using suitable connections connect the tap tails to the hot and cold supplies.

15
1Hold the front and rear of the grey rail end and carefully, but firmly, pull the chrome cover away
from the rail end assembly as shown.
2Prepare two fixing points 470mm vertically apart using a spirit level to facilitate if necessary using suitable fixings to
accept No. 8 non-rusting screws (not supplied).
3Ensuring the handset cradle is on the left side of the rail, pass the rail through the handset
holder whilst keeping the slider button depressed .
5it the rail into the rail end bodies ensuring the indents in the rail are facing the finished wall
surface.
Midas 100 adjustable height head installation
4Current water supply regulations state the handset should not be allowed to pass a point 25mm
above the spill over level of the bath or shower tray. If this cannot be achieved, the hose restraint
must be fitted. This is fitted to the rail under the handset holder.
7
it the rail end covers into position and push firmly into place.
6Secure the rail assembly to the wall using No 8. non-rusting round head screws of suitable length ensuring the rail and rail
end bodies remain firmly engaged.

16
9Connect the hose to the bottom of the valve outlet ensuring the hose washer is correctly fitted to allow the water to
discharge safely to waste and run the shower for a few seconds to clear any debris in the outlet assembly.
10 Turn off the shower and pass the hose through the hose restraint.
11 Disengage the pivot clip and remove the pivot from the bottom of the handset.
12 Ensure the hose washer is in the correct position and screw the pivot into the hose, using a
suitable hexagonal key to tighten, taking care not to over-tighten. Reinsert the pivot into the
handset and engage the pivot clip prior to placing the handset into the handset holder.
8If required, optional outlet flow regulators can be purchased from the Aqualisa customer helpline on 01959 560010.
it the relevant flow regulator into the brass housing ensuring the O’ring faces the incoming flow. Connect the flow
regulator assembly to the valve outlet ensuring the hose washer is correctly fitted.
!Outlet flow regulators are not suitable for products fitted to combination boiler systems.

17
Midas 200 adjustable height head installation
1Drill and plug two holes 540mm-555mm vertically apart using a spirit level if necessary.
it the rail end clip into position and loosely fit the lower bracket into position.
2Pass the rail through the handset holder whilst keeping the slider levers depressed with the
handset holder pointing in a downward direction.
3Carefully slide the gel hook/hose restraint onto the rail under the handset holder.
4Current water supply regulations state the handset should not be allowed to pass a point 25mm above the spill over level
of the bath or shower tray. If this cannot be achieved, the gel hook/hose restraint must be fitted. This is fitted to the rail
under the handset holder.
5it the rail into the rail end bodies taking care to engage the location slot onto the lugs.
6it the rail end clip fitting into position into the top rail end body. Secure the rail assembly to wall
using the screws provided ensuring the rail end bodies remain firmly engaged.
7Place the rail end covers into position and push firmly into place.

18
9Connect the hose to the valve outlet, ensuring the hose washer is correctly fitted to allow the water to discharge safely to
waste and run the shower for a few seconds to clear any debris in the outlet assembly.
8If required, optional outlet flow regulators can be purchased from the Aqualisa customer helpline on 01959 560010.
it the relevant flow regulator into the brass housing ensuring the O’ring faces the incoming flow. Connect the flow
regulator assembly to the valve outlet ensuring the hose washer is correctly fitted.
!Outlet flow regulators are not suitable for products fitted to combination boiler systems.
10 Turn off the shower and pass the hose through the gel hook/hose restraint (if required).
11 Disengage the pivot clip and remove the pivot from the bottom of the handset.
12 Ensure the hose washer is in the correct position and screw the pivot into the hose, using a
suitable hexagonal key to tighten, taking care not to over-tighten.
13 Reinsert the pivot into the handset and engage the pivot clip prior to placing the handset into
the handset holder.

19
User guide
Midas 100 shower valve and bath/shower mixer
1. When the temperature lever knob on the right of the valve when viewed from the front has the red
maximum temperature override button at the top of the knob, the valve is in the mid blend position.
The mid blend temperature is dictated by the temperature of the incoming supplies. To select a
comfortable showering temperature, depress the red button and slowly rotate the knob away from
the finished wall surface to increase the temperature and towards the finished wall to decrease the
temperature, using the temperature markings as a guide.
N.B. Should it be necessary to reset the maximum temperature position, please refer to the commissioning
instructions on page 21. We recommend the MAXIMUM outlet temperature is set to 460C.
2. Turn the valve on by carefully rotating the flow control knob on the left of the valve when viewed from
the front, towards the finished wall surface until the required volume of flow is reached. Turn the valve
off by rotating the flow control knob away from the finished wall until a stop is reached.
N.B. With bath/shower mixers fitted to combination boiler systems, it may be necessary to adjust the
flow control knob and reduce the flow to achieve a comfortable showering and bathing temperature.
To divert from bath fill to shower, with the valve running, lift the diverter knob and twist a quarter turn to
lock the knob into position. To divert back from shower to bath, twist the diverter knob a further quarter turn
until it sits flush on the bath spout.
When the temperature lever knob on the right of the valve when viewed from the front has the maximum
temperature override button at the top of the knob, the valve is in the mid blend position. The mid blend
temperature is dictated by the temperature of the incoming supplies. To select a comfortable showering
temperature, depress the button and slowly rotate the knob away from the finished wall surface to increase
the temperature and towards the finished wall to decrease the temperature, using the temperature
markings as a guide.
N.B. Should it be necessary to reset the maximum temperature position, please refer to the commissioning
instructions on page 21. We recommend the MAXIMUM outlet temperature is set to 460C.
Turn the valve on by carefully rotating the flow control knob on the left of the valve when viewed from the
front, towards the finished wall surface until the required volume of flow is reached. Turn the valve off by
rotating the flow control knob away from the finished wall until a stop is reached.
Midas range bath/shower mixer diverter knob
Turn the valve on by carefully rotating the flow control knob on the left of the valve when viewed from the
front, towards the finished wall surface until a stop is reached. To increase the volume of flow, depress the
eco stop button and rotate the flow control knob further. Turn the valve off by rotating the flow control knob
away from the finished wall until a stop is reached.
N.B. With bath/shower mixers fitted to combination boiler systems, it may be necessary to adjust the
flow control knob and reduce the flow to achieve a comfortable showering and bathing temperature.
Midas 200 shower valve and bath/shower mixer
Midas 200 low pressure flow control
Midas 200 high pressure flow control

20
User guide - Shower head
NEVER ATTEMPT TO MAKE ANY ADJUSTMENT TO THE SHOWER HEAD BY PU ING ON THE SHOWER HOSE.
1. To select the preferred height for the shower head, dependent on the system
purchased, depress the handset holder button or levers fully to enable the
slider to be moved up or down the rail.
Your Midas shower system should be cleaned using only a soft cloth and washing up liquid.
! DO NOT USE ABRASIVE C EANERS.
To reduce the requirement for chemical descaling in hard water areas, the shower heads incorporate rub clean teats. Any scale build
up that may occur in any of the holes can be broken down by gently rubbing the flexible tips of the jets during use.
Should chemical descaling of the head become necessary, remove the shower head and fully immerse in a mild
proprietary descalent.
IT IS IMPERATIVE THAT DESCA ING IS CARRIED OUT STRICT Y IN ACCORDANCE WITH THE MANUFACTURERS
INSTRUCTIONS. SUBSTANCES THAT ARE NOT SUITAB E FOR P ASTICS AND E ECTROP ATED SURFACES MUST
NOT BE USED.
2. Angular adjustment is made by carefully but firmly pulling forwards or pushing back the
shower head against the knuckle in the holder.
3. To select the desired spray pattern rotate the shower spray plate clockwise or anti-clockwise.
Cleaning & maintenance