4
Important Points
Installations must comply with local water authority
by-laws.
The Rada TS202 is suitable for use with either steam
and water or hot and cold water.
Position mixing valve easily accessible for
adjustment and servicing. Install with inlets horizontal
and flat face of cover vertical. Check valves, where
fitted, must be installed in horizontal supply lines with
caps uppermost.
Flush supply lines until water is clear before
connecting mixing valve. Unless water supplies are
known to be clean strainers should be fitted,
positioned so that solids are trapped by screen and
fall to cap end e.g. unsuitable for use in rising
supplies.
Pressures
Minimum:
water 0.15 bar
steam 0.5 bar
Maximum:
water 8.25 bar
steam 7.0 bar
When in use, maintained pressures at inlets must not
exceed ratio of 5:1 (hot and cold water) or 3:1 (steam
and water).
If inlet pressures are unequal and either the outlet is
restricted or less than maximum flow used, due
allowance must be made for resulting increase in
pressure ratio.
Layout and sizing of pipework must be such that
when other services are used, pressures at inlets of
mixing valve are maintained as far as reasonably
possible and do not fall below recommended
minimum.
Connections
Inlets/outlet: 2" BSP.
Connect STEAM or HOT water to inlet marked RED
and COLD water to inlet marked BLUE. Do not
confuse these markings with words ‘hot’ and ‘cold’,
which are cast in the cover as a temperature
regulating instruction.
Flow Control
The mixing valve does not control flow. It must be
fitted with either:-
(a)
Inlet stop valves and unrestricted outlet or
(b)
Inlet check valves and outlet stopcock.
Either method can be used for mixing hot and cold
water, or for mixing steam and water, where water
pressure exceeds steam pressure.
Note: Method (a) must be used when mixing steam
and water where steam pressure exceeds water
pressure.
When outlet flow control is used install conveniently
situated isolating valves for servicing purposes.
If you are in doubt please contact us before
continuing with the installation.
Maximum Temperature Setting
With steam pressure or hot water temperature at
normal, adjust to desired flow rate. Turn temperature
regulating handle to full clockwise position, then
check temperature at discharge point with the
thermometer. If necessary, adjust as follows. Remove
acorn nut (620 42), then prise temperature regulating
handle assembly (916 60) off splined bush (156 60)
and remove splined bush.
Using small adjustable spanner rotate thermostat
spindle clockwise to increase, or anti-clockwise to
decrease temperature, until required maximum outlet
temperature is obtained.
Replace splined bush and position temperature
regulating handle on splined bush so that handle is in
contact with cover stop screw (613 69) which
prevents further clockwise movement.
Tighten acorn nut and re-check maximum
temperature.
Reversed Inlets
If steam or hot water has been connected to cold
inlet and vice versa, this will be indicated by hot
water being obtained when cold is selected and vice
versa, Correct as follows.
Isolate mixing valve. Remove acorn nut, temperature
regulating handle and splined bush. Undo cover
screws and remove cover.
Unscrew pivot screw (613 71) and remove lever (159
60) from body. Transfer lever to opposite side of
body, engaging pivot screw in alternative screw
thread on opposite side of body. Rotate thermostat
assembly through 180
o
.
Replace cover, ensuring thermostat driving pin is
located in vacant slot of lever at opposite end to
pivot screw. Replace and tighten cover screws. Re-
set, maximum temperature, as earlier described.
Maintenance
Periodical cleaning of internal parts will maintain the
mixing valve in good mechanical order.
Frequent movement of temperature regulating handle
will help keep shuttle (011 60) from sticking due to
calcereous deposit. A click will be heard as shuttle
reaches each limit of travel, indicating that it is free.
To service mixing valve, first isolate supplies.
Dismantling
1.
Remove acorn nut, temperature regulating
handle, splined bush, gland nut (623 22), spring
(050 60), and gland ring (165 60). Remove cover
screws and lift off cover.
2.
Remove thermostat assembly from cover by
pressing on end of spindle. Do not damage
spindle. Gland packing (641 15) can then be
removed from cover.
Rada TS202 thermostatic mixing valve
INSTALLATION AND MAINTENANCE ADVICE
INSTALLER - This leaflet is the property of the customer and must be left with the user.
