Crane D1088, D1089 Installation, Operating And Maintanance Instructions

INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS

THERMOSTATIC MIXING VALVES

D1088 & D1089

INTRODUCTION

Are self-acting Thermostatic Mixing Valves designed to blend hot and cold water, to ensure a
constant, safe outlet temperature and prevent scalding.

• Design and manufactured to comply with

BS EN1287 and BS EN1111.

• Have been independently tested and

certified as meeting the requirements of the
D08 specification under the TMV3 scheme.

• The D1089 includes right angle isolation

valves.

• Both the D1088 & D1089 thermostatic

mixing valves are certified under the
BuildCert TMV2 & TMV3 schemes and are
WRAS approved products listed in the
WRAS Approvals Directory:

- BuildCert Approval Number (TMV3):

BC1802/1016 (for TMV3)

- BuildCert Approval Number (TMV2):

BC1801/1016 (for TMV2)

- WRAS Scheme Approval Number:

1301096 (WRAS)

D1089

D1088

THERMOSTATIC MIXING VALVES: D1088 & D1089

2

TECHNICAL SPECIFICATION

Factory Setting

41°C

Temperature Setting Range

30°C to 50°C

Minimum Hot to Mix Temperature

10°C

Temperature Stability

±2°C

Maximum Working Pressure

10 Bar

Min Flow Rate

5 l/min

Table 1

GENERAL INSTALLATION – TMV2 & TMV3

These instructions are issued as guidelines only and may not cover all installation conditions –
if unsure please contact our Technical Helpline before installation.

• Crane FS products are designed for installation and use within suitably designed systems

reflecting CIBSE, BSRIA and HVAC guidelines. Particular care should be taking with regards
to accessibility to valve for setting/adjustment, tube cutting, jointing & bracketing/supports.

• The thermostatic mixing valve must be installed in accordance with the regulations of the

local water company and the Water Supply (Water Fittings) Regulations 1999.

• The D1088 & D1089 are suitable for single outlet applications only.

• The D1088 & D1089 can be installed in any orientation.

• Flush hot & cold supply pipework before connection.

• For the D1088, where isolation valves are not supplied, isolation valves in the water supply

inlets should be fitted as close as practical to the TMV.

• For D1088, wafer strainers are supplied as shown in figure 5.

• For D1089, strainers are supplied and located in the isolation valve body.

TMV3

The D1088 and D1089 have been approved as TYPE 3 valves under the TMV3 scheme. They
have been designed and manufactured for use in Healthcare and Commercial installations and
complying with NHS Estates requirements D 08.

LIMITS OF USE

The D1088 & D1089 have been approved for use on the following designated systems.

Code Operating Pressure Application

HP-S, LP-S High Pressure Shower Temperature 41ºC

HP-W, LP-W High Pressure Washbasin Temperature 41ºC

HP-B, LP-B High Pressure Bidet Temperature 38ºC

HP-T44, LP-T44 High Pressure Bath Fill Temperature 44ºC

HP-T46, LP-T46 High Pressure

Bath Fill (assisted)
Temperature 46ºC

Table 2 - Mixed Water Temperature

Note 1 - HP: High Pressure LP: Low Pressure Note 2 - 15mm not acceptable for LP Tub Fill, LP-T44 & LP-T46.

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THERMOSTATIC MIXING VALVES: D1088 & D1089

INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS

CONDITIONS OF USE

Operating Pressure Range High Pressure Low Pressure

Maximum Static Pressure 10 bar 10 bar

Flow Pressure - Hot & Cold 1 to 5 bar 0.2 - 1 bar

Hot Supply Temperature 52 to 65ºC 52 to 65ºC

Cold Supply Temperature 5 to 20ºC 5 to 20ºC

Table 3 - Normal Conditions of Use for Type 3 Valves

Note 1: The valve may perform adequately outside the conditions in table 3 but the TMV3 scheme approval does

not apply.

Note 2: The highest flow rates will be achieved under balanced pressure conditions, but the pressure at the valve
inlets must be within a ratio of 2:1 under flow conditions and the size and layout of pipe work and fittings must take
this into account.

PRE-COMMISSIONING CHECKS

Follow this method for adjusting the water temperature:

1. Remove the maroon plastic protective cap on top of the valve with a

screw-driver.

2. Back-out the nut, using a monkey spanner:

- To increase the temperature turn anti-clockwise

- To decrease the temperature turn clockwise

- To set the valve to a maximum mixed water temperature in

accordance with the valve application (See Table 4).

Once the correct outlet temperature is set the internal mechanism must
be tested at least 3 times by:

• Alternately isolate the hot & cold water supply. This causes the internal

piston to travel its full stroke and will ensure correct operation
of the valve.

• With hot & cold isolation valves and the terminal outlet fully open retest

the flow temperature. If the set temperature has moved, repeat the
commissioning process.

• A fail safe test must be carried out by isolating the cold

supply. Once isolated, the flow must reduce, within a couple
of seconds, to a trickle - depending on site conditions, supply
temperature/pressure.

• Then repeat fail safe test isolating the hot supply. Once

isolated, the flow must reduce to a trickle within a couple of
seconds – depending on site conditions.

• If either the cold or hot fail safe function does not operate, check;

- Supply pressures

- Supply temperatures

- Hot water supply is at least 10ºC above required mix temperature,

i.e. minimum hot to mix temperature

Figure 1 - D1088 pictured,

cap removal

Figure 2 - D1088 pictured,

temperature setting

Screw driver

Screw

The blue plastic
protective cap

Nut

THERMOSTATIC MIXING VALVES: D1088 & D1089

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COMMISIONING

Since the installed supply conditions are likely to be different from those applied in the
laboratory tests, it is appropriate, at commissioning, to carry out some simple checks and tests
on each mixing valve to provide a performance reference point for future in-service tests.

a) The designation (TMV3) of the Thermostatic Mixing Valve matches the intended application.

b) The supply pressures are within the range of operating pressures for the designation of

the valve.

c) The supply temperatures are within the range permitted for the valve and within guidance

information on the prevention of legionella etc.

d) Record the temperature of the hot and cold water supplies.

e) Record the temperature of the mixed water at the largest draw-off flow rate.

f) Record the temperature of the mixed water at a smaller draw-off flow rate.

g) Isolate the cold water supply to the mixing valve and monitor the mixed water temperature.

h) Record the maximum temperature achieved as a result of (g) and the final

stabilised temperature.

Note: The final stabilised mixed water temperature should not exceed the values in the following table.
i) Use recording equipment such as a thermometer etc. used for the measurements.

Application Mixed Water Temperature

Bidet 40°C

Shower 43°C

Washbasin 43°C
Bath (44°C Fill) 46°C
Bath (46°C Fill) 48°C

Table 4 - Guide to Maximum Stabilised Temperatures Recorded During Site Tests