Crane D1088 Manual

INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS
THERMOSTATIC MIXING VALVES
D1088 & D1089
INTRODUCTION
Thermostatic Mixing Valves (TMV) are self-acting
and 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 (Low Pressure) and BS EN1111 (High
Pressure).
• Have been independently tested and certified as
meeting the requirements of the D08 specification
under the NSF TMV3 scheme.
• The D1089 includes right angle isolation valves.
• Both the D1088 & D1089 thermostatic mixing
valves are certified under the NSF TMV2 & TMV3
schemes and are WRAS approved products listed
in the WRAS Approvals Directory.
• WRAS and NSF approval certificates can be
accessed via the Crane FS website download
portal or alternatively, please contact our
Technical Helpline.
D1088
D1089
TECHNICAL SPECIFICATION
Factory Setting 41°C
Temperature Setting Range 30°C to 50°C
Cold Water Supply Temp ≤25°C (TMV2) / 25°C to 20°C (TMV3)
Hot Water Supply Temp 55°C to 65°C
Minimum Hot to Mix Temperature 12°C
Temperature Stability ±2°C
Maximum Working Pressure 10 Bar
Supply Pressure Imbalance Dynamic 2:1
Table 1

THERMOSTATIC MIXING VALVES: D1088 & D1089
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INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS
CONDITIONS OF USE
Operating
Pressure Range
Low Pressure
TMV2
EN 1287
High Pressure
TMV2
EN 1111
Low Pressure
TMV3
DH Spec D 08
High Pressure
TMV3
DH Spec D 08
Maximum Static Pressure 10 bar 10 bar 10 bar 10 bar
Flow Pressure - Hot & Cold 0.1 to 1 bar 0.5 to 5 bar 0.2 to 1 bar 1 to 5 bar
Hot Supply Temperature 55°C to 65ºC 55°C to 65ºC 55°C to 65ºC 55°C to 65ºC
Cold Supply Temperature ≤25°C ≤25°C 5°C to 20ºC 5°C to 20ºC
Temperature Differential
(Hot Inlet-Outlet) 12°C 12°C 12°C 12°C
GENERAL INSTALLATION
These instructions are issued as guidelines only and may not cover all installation conditions –
if unsure please contact our Technical Helpline before installation.
• All installers have a duty of care and responsibility in ensuring compliance with regulations.
The valve is not guaranteed to function correctly to the TMV2 and TMV3 specification unless it
is installed and used in accordance with these instructions (see “Conditions of Use” section).
• 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 and multiple outlet applications. Care must be
taken when using one valve with multiple outlets as flow rates must be achieved under normal
operating conditions. Please also ensure that the system has been designed within Legionella
control guidelines.
• 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 must be fitted as close as practical to the TMV.
• PRVs to be fitted if required to achieve inlet pressure.
• For D1088, wafer strainers are supplied as shown in Figure 3.
• For D1089, strainers are supplied and located in the isolation valve body, as shown in Figure 4.
TMV2
The valves covered by these instructions have been specifically designed and manufactured as
being in compliance with BS EN1287 and BS EN1111. Valves have been independently tested and
approved as a TYPE 2 valve by the NSF TMV2 scheme for use in domestic situations.
TMV3
The valves covered by these instructions have been approved as TYPE 3 valves and being in
compliance with under the NSF TMV3 scheme. They have been designed and manufactured for
use in Healthcare and Commercial installations and complying with the Health Technical
Memorandum HTM 04-01: Supplement Performance specification D08: thermostatic mixing
valves (healthcare premises)
Table 2 - Normal Conditions of Use for Type 2 and Type 3 Valves
Note: Valves will not be approved for any conditions of use for which testing has not been undertaken. Therefore
licenced valves operating outside these condition cannot be guaranteed by the Scheme to operate as Type 2 or 3
valves.

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THERMOSTATIC MIXING VALVES: D1088 & D1089
INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS
LIMITS OF USE
Crane D1088 & D1089 valves have been approved for use on the following designated systems.
High Pressure HP
(1-5 Bar)
Low Pressure LP
(0.2-1 Bar) Application Max. Mixed Temperature
HP-B LP-B Bidet 38ºC
HP-S LP-S Shower 41ºC
HP-W LP-W Wash Basin 41ºC
HP-T (TMV2) - Bath 44ºC
HP-T44 (TMV3) - Bath 44ºC
Table 3 - Valve Designation of Use for TMV2 & TMV3
Note 1: The British Burns Association recommends 37 to 37.5°C as a comfortable bathing temperature for children.
In premises covered by the Care Standards Act 2000, the maximum mixed water outlet temperature is 43°C.
Note 2: Set the mixed water outlet at these maximum initial temperature settings. During the cold water restoration
stage the mixed water temperature can deviate by 2°C from these maximum initial settings.
BEFORE INSTALLATION
• The hot and cold water inlets of the valve must be cleared, the valve must be correctly
connected to the respective supplies. The valve body is marked with a ‘C’ for cold with a blue
indicator and ‘H’ for hot with a red indicator.
• Check the main valve assembly bores are free of debris and the end sealing faces are clean.
• The use of sealing compounds is not recommended.
PRE-COMMISSIONING CHECKS
1. The designation of the TMV matches the intended application in Table 3 (TMV2 or TMV3).
2. Supply pressures and temperatures are within the operating range of the valve.
3. Isolating valves and strainers are fitted.
4. Supply temperatures are within the range permitted for the valve and by guidance information
on the prevention of legionella.
5. TMVs shall be located in such a way that they can be easily accessed for maintenance an
commissioning purposes.
If all the conditions above are met, proceed to temperature setting.
The mixed water temperature at the terminal fitting should never exceed 46°C.

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.
Follow this method for adjusting the water temperature:
1. Remove the maroon plastic protective cap on top of the valve.
2. Back-out the nut, using a hexagon key:
-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 3).
3. When the valve has been installed following the correct conditions of
use, it is advised that the valve is then subjected to exercise prior to
the commissioning at the application temperature. Operate the valve
from full cold to full hot at least three times.
4. With the valve at the full cold position bring the valve to the correct
temperature. If the valve overshoots this, return the valve to the full
cold and reset.
5. After adjustment replace the cap to lock the valve in position and
prevent tampering.
Commissioning Test Sequence
a. Carry out the following commissioning test sequence:
i. Record the temperature of the hot and cold water supplies adjacent to the TMV. Record
the pressures of the hot and cold water supplies at the inlets of the TMV. Note: if this
measurement is not possible at the inlets to the TMV and is taken elsewhere, then the
pressures at the TMV will be lower than the measured values.
ii. For all outlets, measure the temperature of the mixed water at the maximum available flow
and record.
iii. Isolate the cold water supply to the mixing valve and observe the mixed water outlet.
b. For TMV2: If there is a residual flow during the commissioning or the annual verification (cold
water supply isolation test), then this is acceptable providing the temperature of the water
seeping from the valve is no more than 2°C above the designated maximum mixed water
outlet temperature setting of the valve.
For TMV3: If there is a flow stream after 5 s then collect any water discharging into a suitably
graduated measuring vessel for 60 seconds if the volume of water collected is greater than
120ml then further investigation is needed.
c. Restore the cold water supply, after 15 seconds record the mixed water temperature.
d. Verify that this temperature does not differ from the temperature taken in a) ii. above by 2°C,
(this is a restoration test after a failure of the cold water supply and some deviation of the
mixed water outlet temperature may be expected).
Figure 1 - D1088 pictured,
cap removal
Figure 2 - D1088 pictured,
temperature setting
Nut
Maroon plastic
protective cap
INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS
THERMOSTATIC MIXING VALVES: D1088 & D1089
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INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS
Application Maximum Mixed Water Temperature
Bidet 40°C
Shower 43°C
Washbasin 43°C
Bath (44°C Fill) 46°C
Table 4 - Guide to Maximum Stabilised Temperatures Recorded During Site Tests
IN SERVICE TESTING
Purpose
The purpose of in-service tests is to regularly monitor and record the performance of the
Thermostatic Mixing Valve. Deterioration in performance can indicate the need for service work
on the valve and/or the water supplies.
Frequency of Testing
TMV2
It is a requirement that all TMV2 approved valves shall be verified against the original set
temperature results once a year minimum.
TMV3 (Annex F of D 08)
In the absence of any other instruction or guidance on the means of determining the
appropriate frequency of in-service testing, the following procedure may be used:
a. 6 to 8 weeks after commissioning carry out the tests detailed in “In-Service Tests”.
b. 12 to 15 weeks after commissioning carry out the tests detailed in “In-Service Tests”.
Depending on the results of the above tests, several possibilities exist:
c. If no significant changes (e.g. ≤1 K) in mixed water temperatures are recorded between
commissioning and 6 to 8 week testing, or between commissioning and 12-15 week testing
the next in-service test can be deferred to 24 to 28 weeks after commissioning.
d. If small changes (e.g. 1 to 2 K) in mixed water temperatures are recorded in only one of these
periods, necessitating adjustment of the mixed water temperature, then the next in-service
test can be deferred to 24 to 28 weeks after commissioning.
e. If small changes (e.g. 1 to 2 K) in mixed water temperatures are recorded in both of these
periods, necessitating adjustment of the mixed water temperature, then the next in-service
test should be carried out at 18 to 21 weeks after commissioning.
f. If significant changes (e.g. > 2 K) in mixed water temperatures are recorded in either of these
periods, necessitating service work, then the next in-service test should be carried out at 18 to
21 weeks after commissioning.
The general principle to be observed after the first 2 or 3 in-service tests is that the intervals of
future tests should be set to those which previous tests have shown can be achieved with no
more than a small change in mixed water temperature.
e. If the mixed water temperature differs by more than 2°C from the set temperature taken at a)
ii. above, then recheck the supply conditions or re-commission.
f. The valve must then be adjusted and re-commissioned in accordance with the manufacturers’
instructions.
Commissioning Test Sequence (CONITNUED)
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THERMOSTATIC MIXING VALVES: D1088 & D1089

MAINTENANCE
Most domestic water supplies contain calcium which will separate out when the water is heated
in a system. The degree and speed of scaling may vary depending on factors such as water
flow rates, system design, the hardness of the water and the temperature to which the water is
heated.
Deposits of scale may over time form in the valve, particularly at the hot inlet. The formation
of the scale may adversely affect the performance of the valve which will be detected during
the in-service testing. If this occurs it will be necessary to remove the valve for de-scaling and
service.
If required, the internal working parts can be removed and cleaned as follows:
Figure 3 - D1088 pictured, exploded views
Tailpiece Assembly
Sealing Gaskets
Union Nut
Check Valve
Water Strainer
Tailpiece
Olives
Compression Nut
Protective Cap
Locknut
Headwork
Flow Guide
Main Spring
O-Ring
Thermal assembly
and piston assembly
Locating Ring
Service Work Procedure
Using the same measuring equipment or equipment to the same specification as used in
the commissioning of the valve, adjust the temperature of the mixed water in accordance
with the requirement of the application. Follow the same test procedure as detailed in the
‘Commissioning Test Sequence’ section.
If the mixed water temperature has changed significantly from the previous test results
(e.g.> 1 K), record the change and before re-adjusting the mixed water temperature check:
a. That any in-line or integral strainers are clean.
b. Any in-line or integral check valves or other anti-back siphonage devices are in good working
order.
c. Any isolating valves are fully open.
With an acceptable mixed water temperature, complete the same series of tests as outlined in
the ‘Commissioning Test Sequence’ section on page 4 and 5.
Note: In-service tests should be carried out with a frequency, which identifies a need for service work before an
unsafe water temperature can result.
INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS
THERMOSTATIC MIXING VALVES: D1088 & D1089
5

INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS
MAINTENANCE (CONTINUED)
1. Isolate hot and cold water supply.
2. Remove the valve to a clean working area.
3. Remove the protective cap.
4. Unscrew the headwork of the valve.
5. Carefully remove the temperature-sensitive and piston assembly, put to one side.
6. Remove the main spring and flow guide, carefully put to one side.
7. Inspect the components for contamination or damage.
8. Clean or replace as necessary.
9. Remove the O-ring.
10. Clean the valve body and Headwork using a propriety de-scaler
(approved for use on potable water applications).
11. Thoroughly rinse the body and headwork in clean potable water.
12. Carefully fit new O-ring to body.
13. Carefully re-fit all components and perform the commissioning sequence.
14. If after cleaning the valve and replacing the O-ring seals the valve does not function
correctly, it may be necessary to replace the thermal element.
Figure 4 - Isolation Valves Fitted to D1089 range
All D1089 mixing valves are provided with isolation valves in lieu of the tail piece arrangement.
This allows the connections of the hot and cold water supplies to be parallel to the mixed water
outlet for ease of piping layouts.
The assemblies comprise an integral full bore ball valve and in-line strainer in an angled
housing. When this arrangement is used, the requirements for isolation valves and strainers
previously mentioned are regarded as fulfilled.
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THERMOSTATIC MIXING VALVES: D1088 & D1089

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Every effort has been made to ensure that the information contained in
this publication is accurate at the time of publishing. Crane FS assumes
no responsibility or liability for typographical errors or omissions or
for any misinterpretation of the information within the publication and
reserves the right to change without notice.
• Designed and manufactured under quality management
systems in accordance with BS EN ISO 9001:2008
FM311 ISO 9001