Hoval CT plus 180, Operating, Installation And Maintenance Manual

Page: 6 / 22

6
Outputs Based on 10
o
C Cold Feed, 82
o
C Primary Flow and 60
o
C Secondary Flow.
Model
at different primary flow rates
Hydraulic Resistance
at different flow rates
Primary
Secondary
Flow rate l/s Resistance m bar Flow rate l/s Resistance m bar
CT plus 180
CT plus 420
CT plus 280
CT plus 520
Primary flow rate
litres/second
Continuous hourly
draw off litres
10 mins draw off
litres
0.75
1.12
1.50
180
1.50
2.50
720
1000
280
1.50
2.00
2.78
960
1250
1365
420
520
550
590
1.50
2.00
2.78
1037
1337
1590
520
0.75
1.12
1.50
1.50
2.50
1.50
2.00
2.78
1.50
2.00
2.78
35
78
140
15
50
15
23
63
13
23
63
0.75
1.12
1.50
1.50
2.00
1.50
2.00
2.50
1.50
2.00
2.50
30
67
120
18
32
26
45
70
40
71
111
*
For higher flow - short duration draw off. Based on use of stored capacity only.
These secondary flow rates cover typical draw off requirements. Please note that they significantly exceed the continuous hourly rate.
Rating kW = Q x S.H. x (T
2
- T
1
)
Q = Calorifier hourly output - Litres (kg)
T
1
= Temperature cold feed -
o
C
T
2
= Temperature DHW flow -
o
C
S.H. = Specific heat (4.187) - kJ/kg
o
C
To calculate the load on the boiler for
the calorifier primary supply.
Note for Hydraulic Testing: The primary
jacket should not be pressurised without
first filling and sealing the inner stainless
steel vessel.
An adjustable secondary thermostat has
a sensing point which ensures that the
main body of water is held uniformly,
without stratification at the required pre-
set level, normally 60
o
C - 65
o
C.
DHW Output
*
Primary and Secondary Hydraulic Resistance.
3600
Model
CT plus 180
CT plus 420
CT plus 280
CT plus 520
Legionellae
The safe temperature for storage is now considered to be a minimum of 60
o
C to prevent the risk of
legionella bacteria contamination. For kitchen and similar duties requiring 60
o
C water, the supply can be direct from the
calorifier. For washing and showering duties which require a 42
o
C supply, mixing or blending with cold water, external to the
calorifier, is required and will increase the secondary output listed on page 5 by about 25%.
Technical and Performance Details
When temporarily operating the primary side only, the pressure should not
exceed 1 bar g and the secondary side should be vented.
Chloride
The maximum allowable chloride content of DHW cold feed water is 100mg/litre,
(or up to 200 mg/litre where optional sacrificial anodes are fitted).
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