Bristan Gummers H64WMT Assembly instructions

IN-SERVICE TESTING
The purpose of in-service testing is to regularly monitor the thermal performance of the
thermostatic mixing valve. Deterioration in performance can indicate the need for
service work to be carried out on the system.
If the authority concerned does not have a planned test and maintenance schedule then
the suggestions below should form the basis of a new system.
At intervals of 6 - 8 weeks and 12 - 15 weeks after commissioning:-
1. Check supply parameters are still within the expected values if not check system for
faults.
2. Carry out commissioning procedures a to c using the same test equipment, if the
mixed water temperature has changed a significant amount (by more than 1K)
check to ensure in line filters are clean, that the check valves are working and all
isolating valves are fully open. If no fault can be found check and record the mixed
water temperatures and readjust mixed water temperature to the values in table 2.
Complete the commissioning procedure a to f if the mixed water temperature
exceeds the values of the maximum recorded temperature by more than
2K the need for service work is indicated.
Depending on the results of these two tests the following should be adopted
a) If a small change (e.g. 1K to 2K) occurs in one of these tests or there is no
significant change (e.g. 1K maximum) then the next in service test should be 24 to
28 weeks after commissioning.
b) If small changes occur in both tests or a larger change occurs in one test
(exceeding 2K) then the next in service test should be carried out 18 to 21 weeks
after commissioning.
These results can then be used to set a service interval which tests have shown can be
used with no more than a small change in mixed water temperature. This method of
determining service intervals is used to take into account various in-service conditions
(i.e. water condition) that the valve may experience.
Installation, operating and maintenance
instructions for Gummers
H64WMT & H64DMT
Sequential Integral Thermostatic Bib Tap
Before installing or operating this tap please read this manual carefully and retain it for future
reference.
Bristan operate rigorous quality control procedures but in the unlikely event of finding this pack
incomplete, or needing further technical information please contact the manufacturer.
TMV3 Approval Certificate number BC351/0508
LP - WE LOW PRESSURE ECONOMY WASH BASIN
HP W HIGH PRESSURE WASH BASIN
WRAS Approval Certificate number 0804010
Birch Coppice Buisness Park
Dordon
Tamworth
Staffordshire
B78 1SG
Tel: [phone]
Free fax Order Line: 0808 1611002
Email: [email protected]
Website: www.bristan.com/trade
BristanGroup Limited
800386H
Customer Care 0844 7016273
)

Introduction
Conditions for normal use
Specification
The NHS is aware that users of hot water in care establishments can be at risk
from scalding and in order to minimise that risk and reduce the incidence of
legionella thermostatic mixing valves are generally used. To ensure the
performance of these products the NHS Estates Model Engineering Specification
DO8 was written. This product is independently certified to comply with that
specification for use as a hand-washing device on both high and low pressure.
This fitting is designed to have the following advantages: -
1) The temperatures of the exposed surfaces in normal use will not cause
skin damage.
2) Integral in front of panel isolation and union connections allow the
complete unit to be removed for workshop servicing.
3) Integral flushing system allows the mixed water chambers to be
pasteurised reducing the risk of bio film growth.
It can be used in any situation where a thermostatically controlled temperature is
required for hand washing or vessel filling.
This product is approved by Buildcert for the following designations:
In order ensure the product will perform within the requirements of the TMV3
scheme the operating parameters should comply with the table below, it may
perform adequately outside these limits but an engineer should carry out a risk
assessment to substantiate this.
The flow rates (L/min) for the tap with and without flow limiters are quoted in
the table below:
NOTES
Code Operating Pressure Application
HP - W High Pressure Wash Basin
LP - WE Low pressure Economy Wash Basin
Pressure Drop bar 0.1 0.2 0.4 0.6 0.8 1 1.5 2 3 4 5
Flow rate without limiters 4 5.8 8 10 11.6 12.9
Flow rate with limiters 8.5 9 9.3 9 9 9
No Flow Regulators
W ith Flow Regulators
ORDER CODE DESCRIPTION
SKH64-1 O-RING SEALS KIT
SKH64-2 CARTRIDGE ASSEMBLY
SKH64-3 FLOW STRAIGHTNER
SKH64-4 HANDLE ASSEMBLY.
SKH64-5 INLET ASSEMBLIES (PAIR)
SKH64-6 COLD ELBOW ASSEMBLY (WALL MOUNT)
SKH64-7 HOT ELBOW ASSEMBLY (WALL MOUNT)
SKH64-8 COLD ELBOW ASSEMBLY (DECK MOUNT)
SKH64-9 HOT ELBOW ASSEMBLY (DECK MOUNT)
SKH64-10 WALL SHROUDS CHROME (PAIR)
SK1500-3 THERMOSTAT & PISTON ASSEMBLY
SK320078 PISTON ASSEMBLY
SK740012 THERMOSTAT
HTM64 SPARES LISTING
Low
pressure
High
pressure
Maximum Static Pressure 10 bar 10 bar
Minimum Dynamic Pressure 0.2 to 1 bar 1 to 5 bar
Recommended hot supply temperature 52 to 65ºC 52 to 65ºC
Recommended cold supply temperature 5 to 20ºC 5 to 20ºC
Minimal Temperature Differential between Mixed Water
Temperature and Either Supply
10ºC 10ºC

Faultfinder
Installation
A competent person must always carry out the installation of this product in
accordance with these instructions. The installation must comply with the
current local water company regulations.
The following points should always be considered when carrying out an
installation
1) Care must be taken to prevent any risk of injury or damage to persons or
property.
2) The product has integral isolation for servicing the unit, further isolation
could be included if considered necessary.
3) To eliminate pipe debris entering the valve the system must always be
thoroughly cleaned and flushed particularly if it is new, or extensive
modification has taken place. The product must never be used without
the in line filters fitted; failure to fit the filters may invalidate the
guarantee.
4) The fitting is supplied with a single check valve in each inlet; it should
be fitted so that the relevant air gap specified in the water regulations is
achieved above the spillover level of the basin or trough.
5) The surface to which the unit is to be fixed needs two holes minimum
23mm diameter maximum 30mm diameter at 150mm to 200mm centres
(the tails are eccentric giving variable centres)
6) If fitted in a health care environment the relevant Health Technical
Memorandum must be consulted to ensure correct positioning of the
outlet in relation to the basin or trough.
7) The unit is supplied suitably configured for fitting onto a high pressure
system if a low pressure system is to be used the flow limiters (item 16
and 17) must be removed see servicing for method.
8) When viewed from the front and the unit is connected to the supplies the
Hot supply must be connected to the left hand inlet and the cold to the
right hand inlet.
Inlets 15mm Compression or ½” BSP
Male Iron
Outlet 24mm Flow Straightener
Minimum pressure drop through fitting for correct
mixing
0.1 bar
Maximum Pressure Drop Through Fitting for Correct
Mixing
5bar
Maximum static pressure to be applied to fitting 10bar
Mixed water temperature variation with nominal
variations of supply parameters
± 2ºC
Factory set maximum mixed water temperature 43ºC
Maximum hot supply temperature 80ºC
Maximum pressure loss ratio without flow limiters 5:1
Fault Cause Repair
No or reduced flow and/or
fluctuating temperature
One or both isolating valves not
fully open
Flow limiters incorrectly fitted
Inlet pressures below specified
values
Supply pipes blocked
Waterways in tap blocked
Supply pressures unequal
Open both valves fully
Check information and refit
correctly
Alter system to increase supply
pressures
Rectify system fault
Clear debris or call service
department
Check maximum pressure
differential, and check if flow
limiters correctly fitted
Maximum outlet temperature
too hot
Maximum mixed water
temperature incorrectly set
Reset temperature see
calibration section
Maximum outlet temperature
too cold or runs cold after a
short time
Maximum mixed water
temperature incorrectly set
Hot water temperature too low
Reset temperature see
calibration section
Increase water temperature by
adjusting storage temperature or
power input to the system
Mixed water flow too high Flow limiters incorrectly fitted See section on flow limiters
Only hot or cold water at outlet Maximum mixed water
temperature incorrectly set
Inlet supplies reversed
Reset temperature see
calibration section
Re pipe supplies
Tap will not shut off or dripping Seal damaged or worn
Scale build up in body
Inlet pressure above maximum
static pressure rating
Renew seals from spare parts kit
Service and descale fitting
Reduce pressure possibly by
fitting reducing valve
No thermostatic fail safe Inlet temperatures outside
specification
Debris trapped in mechanism or
mechanism jammed
Inlet supplies reversed
Reset boiler or recirculation
temperatures
Strip and clean unit or call the
service dept
. Re pipe supplies

Calibration
Operation
Maintenance
Isolating and removal of the valve
Due to variations in supply parameters from those used to set and test the
products in our factory the outlet temperature will require resetting on site. The
temperature will need to be set between 39ºC and 41ºC in order to comply with
TMV3 approval this is done by fully opening the valve, using a thin blade
remove the indice holder (45) with indice (46) still attached. Then inserting a
2.5mm hexagon wrench into the adjusting screw (32) and turning the screw
clockwise for a cooler temperature and anti clockwise for a warmer temperature
see Fig 1
Insert isolator
and turn
The unit has a single control lever that turns the unit on and off and adjusts the
temperature. Turning the handle anti clockwise from the off position firstly gives
cold water flow then increases the temperature to the maximum set value.
This product is designed to be easily serviced, it has integral isolation, integral
hot water flushing to pasteurise the mixed water chambers reducing the
incidence bio film growth and unions that allow the complete body to be
removed for servicing in the workshop.
The valve has integral isolation this is accessed by unscrewing the shroud (13)
and pulling it back along the elbow taking care not to scratch the chrome, the
2.5mm hexagon wrench is inserted in the isolating plug (6) and rotating it
clockwise until it locks. The securing nut (14) is then removed whilst supporting
the valve to stop it falling and damaging the surface below it. The valve can then
be replaced or serviced as is most convenient. The valve is replaced by reversing
the above procedure ensuring the O-ring is undamaged and in place.
The purpose of this section is to ensure the valve is adjusted correctly for the
system in use.
The supply pressures and temperatures should be checked to ensure they are
within the requirements of DO8 and the flow limiters set as per the above table
The fitting should be run for several minutes until the mixed water and incoming
water temperatures have stabilised, the mixed water temperature should be
adjusted as per the calibration section above,
The cold water to the fitting should be isolated the mixed water flow should
reduce to a drip or small run, the cold water reinstated and the temperature
should recover close to the original temperature.
The following information should be recorded
a) The temperature of incoming supplies.
b) The temperature of mixed water outlet under normal running.
c) The temperature of any residual flow after cold isolation.
d) The temperature of mixed water outlet under normal running after
isolation.
e) Record the identity of all instruments used.
The thermostatic mixing valve (TMV) will be installed in such a position that
maintenance of the TMV and its valves, and the commissioning and testing of
the TMV can be undertaken
The fitting of isolation valves is required as close as is practical to the water
supply inlets of the thermostatic mixing valve.
Fig 1
Fig 2

The following steps are required: -
1) Ensure the fitting is turned off
2) The cold water isolator should be closed, this is accessed by unscrewing
the shroud (13) and pulling it back along the elbow taking care not to
scratch the chrome, the 2.5mm hexagon wrench is inserted in the
isolating plug (6) and rotate it clockwise until it locks.
3) The back cover (3) is unscrewed using a 2.5mm hexagon wrench and put
to one side.
4) The flushing screw (19) is unscrewed downwards till it is level with the
bottom of the body (do remove completely) see Fig4.
5) Turn the fitting on, hot water at the inlet temperature will pass through
the unit pasteurising the waterways and flow straightener.
6) Turn the fitting off.
7) The flushing screw (19) is screwed upwards till it locks.
8) Replace the back cover (3) , reinstate the cold water and replace the
shroud (13).
The unit is now ready for use.
If the authority concerned already has a suitable commissioning and
maintenance program in operation then this section can be disregarded. If not
this section can be used as a guideline to introduce such a system.
The purpose of any commissioning and in service testing procedure is to set the
valve correctly and monitor any deterioration in the valves thermal performance.
not
Commissioning
Cleaning integral filters
Flow limiters
Pasteurising system
The integral filters are fitted into the inlet elbows to the fitting. The fitting
should be removed from the bases as described in the previous section the filters
are then accessible for servicing as shown in Fig3. They are a friction fit into the
adaptors and should be care fully prizes out washed and refitted. Failure to refit
the filters may invalidate the guarantee.
As supplied the fitting has flow limiters fitted to both inlets so it is suitable for
high-pressure use. For use on low pressure they may need to be removed see
table below. The procedure described above for cleaning the filters should be
followed. After removal of the filter the flow limiters are visible and should be
removed using a small pointed instrument.
In order to kill off any bio film growth this range of fittings has a built in
cleansing feature that allows the mixed water passages to be flushed with hot
water without the need to disassemble the mixer or reset the mixed water
temperature.
Owing to the high water temperatures passing through the fitting this operation
should only be performed by a competent person using the necessary safety
equipment.
SUPPLY PRESSURES FLOW LIMTERS
High pressure hot
High pressure cold
Grey limiter 6l in hot side
Yellow limiter 10l in cold side
(As supplied)
High pressure hot
Low pressure cold
Grey limiter 6l in hot side
Remove limiter
Low pressure hot
High pressure cold
Remove limiter
Yellow limiter 10l in cold side
Low pressure hot
Low pressure cold
Remove both limiters
Fig 4
Fig 3

Line Drawings
All dimensions in mm.
H64WMT
H64DMT
Diagram for reference only