TAHI THERMOSTATIC MIXER VALVE (1 and 2 outlets) t...
Transcript of TAHI THERMOSTATIC MIXER VALVE (1 and 2 outlets) t...
TAHI THERMOSTATIC MIXER VALVE (1 and 2 outlets) INSTALLATION INSTRUCTIONS
Issue A435036
Methven warrants this product against manufacturing defects and that it is suitable for use under the operating conditions specified in this instruction sheet. For your warranty please refer to www.methven.com or call Customer Service
TESTING AND MAINTENANCE
● The valve must be tested to ensure correct operation at commissioning and thereafter at intervals no greater than 12 months
● For details on maintenance procedures and spare parts please refer to 435035 Tahi Thermostatic Maintenance Guide
New Zealand0800 804 222
Australia1300 638 483
UK 0800 195 1602
A.
TECHNICAL SPECIFICATIONS
Operating PressureSuitable for mains pressure.Min 150kPa, Max 500kPa (Dynamic).
Operating TemperatureMaximum mixed temperature 47˚C
Inlet ConnectionsFemale ¾” BSP / ¾” NPTAll pipework must be thoroughly flushed prior to installation of the system
OPERATING CONDITIONS OF USE Before installation the operating conditions of use must be checked. Table 1 contains details of the necessary conditions of operation.
Operating pressures above 500kPa will require the installation of a pressure reducing valve.
Single Dual
Maximum Static Pressure 1000kPa 1000kPa
Flow pressure (Hot & Cold)
150- 500kPa 150- 500kPa
Hot Supply Temperature 55 - 85 °C 55 - 85 °C
Optimum Hot Supply Temperature
60 - 65 °C 60 - 65 °C
Cold Water Supply Tem-perature
5 – 25 °C 5 – 25 °C
Maximum Allowable Outlet Temperature
46 °C 46 °C
Max Dynamic Pressure Ratio (Hot to Cold OR Cold to Hot)
3.5 : 1 3.5 : 1
Minimum Temperature Differential Between Either Supply and Outlet Temperature
12 °C 12 °C
Installation Type Concealed Concealed
Number of Outlets 1 2
Service Valves Integral Integral
End Connector Specs FEMALE: ¾” BSP / ¾” NPT
FEMALE: ¾” BSP / ¾” NPT
Overal Dimensions(W x H x D)
164mm x 191mm x 145mm
221mm x 191mm x 145mm
Table 1. Operating Conditions of use
* If a water supply is fed by gravity then the supply pressure should be verified to ensure the conditions of use are appropriate for the valve.
NORMAL OPERATING CONDITIONS
● Inlet Dynamic Pressures nominally balanced to within 10% of each other. ● A temperature differential of approximately 50˚C between the hot and
cold inlet temperatures. ● A temperature differential of 15-30˚C between the mixed blend setting
and either supply.
NOTES ● The Tahi thermostatic mixer valve is precision engineered and will give
continuous safe and controlled performance providing it is installed, commissioned and maintained according to the instructions contained in this document.
● The fitting of strainers is recommended as close as is practicable to the water supply inlets of the thermostatic mixing valve. (Recommended maximum mesh aperture of 0.02”).
● For reasons of general safety hot water storage temperature should generally be maintained between 60˚C - 65˚C.
● The factory nominal preset temperature is achieved with inlet conditions of 300 kPa balanced dynamic pressure, cold inlet temp at 15˚C and hot inlet temp at 70˚C. Preset temperature may vary if site conditions differ from these values.
FLOW RATES
0
10
20
30
40
50
Flow
Rat
e (L
/min
)
150 200 250 300 350 400 450 500
Dynamic Pressure (Inlet) kPa
150200250300350400450500
23.927.330.633.736.739.542.244.8
MAX Flow Rate (L/Min)
29.132.836.439.742.945.948.851.5
Dyn
amic
Sup
ply
Pres
sure
(kP
a)
Single Dual
Single Outlet
Dual Outlet
Symptom 1Only hot or cold water
from outlets
Symptom 3Mixed outlet
temperature drift.
Symptom 4Cross feed of hot
water into supply or vice versa.
Symptom 5Maximum mixed outlet temp too high or low.
Check inlet supplies are not reversed.
Check that hot water is reaching
the mixer.
Check that service valves are both
open.
Check if the hot or cold supply has
failed.
Check that operating
conditions have not changed.
Refer symptom 2.
Refer symptom 3&4.
Check strainers around cartridge for
blockage
Check that dynamic pressures are
nominally balanced.
Check cartridge performance.
Replace if necessary
FAULT FINDING FLOWCHART
Check non-return valve function
Check strainers around cartridge
for blockage
Check that service valves are both
open (see B)
45
4510
6 (±
10m
m)
106
(±10
mm
)84
(±10
mm
)
84 (±
10m
m)
Check limit settings(Refer to
commissioning)
Check non-return valve function.
NOTE: 1) VALVE TRAVEL ±40°. DO NOT OVERSTRESS2) VALVE OPEN DIRECTIONS DIFFER ON HOT AND COLD
7
operate.
Check installationdepth is within
manufacturers statedlimits (refer step 1)
Dual Flow Unit Single Flow Unit
All measurements in mm. All measurements in mm.
163
91
40
Hol
e ce
ntre
s at
173.
2
91
57.4 40
221
Hol
e ce
ntre
s at
173.
2
B. Sevice Valve Operation
OPEN
OPEN
CLOSE
A.
CLOSE
Sing
le F
low
Uni
tD
ual F
low
Uni
t
Rough in assembly
Roug
h in
Box
Trim
Kit
Box
Roug
h in
Box
Trim
Kit
Box
Rough in assembly Lever covers
Faceplate
Escutcheon assembly
Depth Adjustor
Dial knob
Dial Capassembly
2 Short Screws2 Long Screws
Dial GuideWooden stick
Lever coversFaceplate
Escutcheon assembly
Depth Adjustor
Dial knob
Dial Capassembly
2 Short Screws2 Long Screws
Dial GuideWooden stick
Remove screw. Do not discard.
A. Rotate temperature stop fully anti-clockwise
B. If temp ≤ 47°C If temp > 47°C
Adjust (see commissioning)
COMMISSIONING -
The Tahi thermostatic mixer valve is factory set to the required temperature. Check the valve after installation to ensure it operates at the correct outlet temperature.
Prior to commissioning the Tahi thermostatic mixing valve check the following:
● The designation of the thermostatic mixing valve matches the application.
● The supply pressures are within the valves operating range.
● The supply temperatures are within the valves operating range.
● Isolating valves (and strainers preferred) are installed.
REMOVE MAXIMUM TEMPERATURE STOP
A. Remove screw. Do not discard.
B. Rotate clockwise until water temp = 38°C
NOTE - Use of supply line or zone strainers is strongly recomended.
1
MOUNT PARALLEL TO WALL LINING
2
P < 1000 kPa/10 bar(Test pressure must not exceed 1000 kPa/10 bar)
CHECK WATERTIGHTNESS
3 FIT WALL LINING AND REMOVE DUST COVER
USE PROVIDED TEMPLATE FOR ACCURATE HOLE DIMENSIONS.
6mm
MAX
6mm MAX
4
Wall lining
Tiles
TRIM FLUSH AND SEAL WITH SILICON
5 CHECK MAX OUTLET TEMPERATURE
6 FIT TRIM COMPONENTS
7 SET WATER TEMP TO 38°C
8 ASSEMBLE DIAL GUIDE AND DIAL
Dialguide
Dial
DOWNWARD ORIENTIATION OF BUTTON CRITICAL
9 ASSEMBLE HEIGHT ADJUSTOR
A. Hold dial hard against faceplate.
B. Wind depth adjustor into dial. Stop when you feel dial starting to push away from the faceplate
Faceplate
Depth adjustor
8mm Allen key
Dial
C. If depth adjustor protrudes past the front face of the dial; Remove the depth adjustor and trim at midpoint (cut in half). Reassemble as per steps 9: A and B
10A. Insert and tighten
screw using 2.5mm Allen key (finger tight only) to fix dial position.
B. Fit cap (force required)
Tip: Insert dot end of cap first
HOLD DIAL TO STOP ROTATION WHILST TIGHTENING.
FIT DIAL CAP
Note: Dot orientation on dial cap is at top (opposite dial button).
1
2TEMPERATURE MUST NOT EXCEED 47°C
ADJUST TEMPERATURE TO DESIRED MAXIMUM.
3 REASSEMBLE MAXIMUM TEMPERATURE STOP
Assemble with faces aligned as shownNote: Do not Rotate cartridge control knob while assembling Maximum temperature stop
Maximum temperature stop
x 2 (long screws)
x 2 (short screws)
x 2 (Allen screws)
VERT
ICA
L
=
=
96-116mmOPTIMUM = 106mm
= =
PARALLEL
MOUNT MIXER BODY IN WALL CAVITY
NOTE - Levers to be inserted from bottom as shown in diagrams A and B
NOTE - Locating feature
Trim
Depth Adjustor
Dial
Maximum temperature stop
Cartridge control knob
Wall lining
Wall lining
A. B.