7
OUTLET/TERMINAL FITTINGS (TAPS, ETC.)
The Pre-plumbed cylinder can be used in conjunction with most types of terminal fittings, plumbing fittings and pipework.
However, the rated pressures of any fittings selected should be checked for compatibility before installation.
NOTE: Accessories, plumbing fittings and pipe work should have a rated operating pressure of at least 8 bar.
Outlets situated higher than the cylinder will give outlet pressures lower than that at the unit, a 10m height
difference will result in a 1 bar pressure reduction at the outlet fitting.
LIMITATIONS
The
Pre-plumbed
cylinder should not be used in association with any of the following:
• Solid fuel boilers or any other boiler in which the energy input is not under effective thermostatic control, unless additional
and appropriate safety measures are installed.
• Ascending spray type bidets or any other class 1 back syphonage risk require that a type A air gap be employed.
• Steam heating plants unless additional and appropriate safety devices are installed.
• Situations where maintenance is likely to be neglected or safety devices tampered with.
• Water supplies that have either inadequate pressure or where the supply may be intermittent.
• Situations where it is not possible to safely pipe away any discharge from the safety valves.
• In areas where the water consistently contains a high proportion of solids, e.g. suspended matter that could block the
strainer unless adequate filtration can be ensured.
OPERATIONAL SUMMARY
Maximum mains supply pressure
1.6 MPa (16 bar)
Operating pressure
0.35 MPa (3.5 bar)
Expansion vessel pressure
0.35 MPa (3.5 bar)
Maximum design (Rated) pressure
0.8 MPa (8 bar)
Expansion relief valve setting
0.8 MPa (8 bar)
T&P relief valve setting
90°C/1.0 MPa (10 bar)
T&P relief valve manufacturers ref
RWC PTEM 510003
Maximum primary circuit pressure
0.3 MPa (3 bar)
Maximum heating fluid temperature 85
o
C
Storage capacity
See Table 1 below
Weight when full
See Table 1 below
OUTLINE SPECIFICATIONS
The cylinders are designed, constructed and tested for compliance with BS EN 12897:2016
Outer casing: White pre-painted corrosion resistant steel
Water container: Duplex stainless steel. 100% pressure tested to 1.5 MPa (15 bar).
Thermal insulation: CFC/HCFC free fire retardant expanded polyurethane foam with zero ozone depletion potential. It has a
Global Warming Potential (GWP) of 3.1. Nominal thickness: Standard units 60mm - Slimline units 50mm.
Table 1 - Unit Weights & Standing Heat Loss
Model Type
Nominal
Capacity
(litres)
Weight of
full unit (kg)
Weight of
unit (kg)
Standing Heat Loss
per day (kWh/24h)
per year (kWh/365d)
Standard
150
205
55
1.15
419.7
Standard
170
228
58
1.23
448.9
Standard
210
(Small)
274
64
1.53
558.5
Standard
210
(Large)
278
68
1.53
558.2
Standard
250
324
74
1.80
657.0
Standard
300
382
82
2.06
751.9
Slimline
150
209
59
1.40
511.0
Slimline
170
233
63
1.59
580.4
IMPORTANT INSTALLATION NOTE
WHERE THE INLET SUPPLY TO THE PRESSURE REDUCING VALVE (PRV) IS ROUTED THROUGH A HEATED SPACE
AND IS FITTED WITH A CHECK VALVE OR OTHER FITTING THAT WOULD PREVENT BACK FLOW, HIGH PRESSURES
CAN BE EXPERIENCED IN THE INLET PIPE DUE TO WARMING THAT CAN CAUSE DAMAGE TO THE PRV OR OTHER
FITTINGS ON THE INLET SUPPLY. IN THESE CIRCUMSTANCES, THE INSTALLATION OF A MEANS TO ACCOMMODATE
EXPANSION AND THUS LIMIT THE PRESSURE RISE IN THE INLET PIPE IS RECOMMENDED. REFER TO THE
INSTALLATION SECTION FOR FURTHER DETAILS.
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