Gulfstream GS A-Class 12/OV, Инструкции по проектированию, установке и обслуживанию

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Page 10
2.2 HOT WATER PERFORMANCE
This appliance has hot water priority
control logic and the hot water storage
vessel is directly heated by the boiler and
therefore full boiler output is used for
heating hot water resulting in very short
recovery times. Typical recovery times for
raising the stored water temperature by
45
o
C for models ‘-12’, ‘-20’, ‘-30’ are 25, 15
and 10 minutes respectively.
The hot water performance of the
appliance is shown in fi gure 2.2. The fl ow
rates and the corresponding maximum
hot water volumes drawn off and quoted
in table 2.2 and fi gure 2.2 assume adequate
dynamic pressure and fl ow to property and
the store is charged to design temperature
of 75
o
C.
The mixed fl ow temperature will provide
a 35
o
C rise when water is drawn off at up
to 35 l/min as shown in fi gure 2.2 provided
the maximum water volume is not
exceeded. At nominal 35
o
C temperature
rise, the maximum hot water production
of the models ‘-12’, ‘-20’ and ‘-30’ is 400, 560
and 770 litres per hour respectively.
2.3 SPACE HEATING PERFORMANCE
All models modulate down to about 10kW
heat output without burner cycling and if
the demand is below this level, the burner
will cycle to match the heat demand.
GulfStream A-CLASS has ‘hot water priority’
controls and therefore full boiler output
is available for space heating i.e. no
allowance is necessary for domestic hot
water load when selecting the appliance.
All GulfStream A-CLASS models are fi tted with
Grundfos UPR 15-50 modulating pumps
as standard. The net pump head available
for space heating circuit is shown below
in fi gure 2.3.
All models are factory fitted with an
automatic bypass valve and is factory
set to operate at a differential pressure
of 2.5m head.
For optimum performance, this valve
must be set during commissioning to suit
the heating system. The characteristic of
the automatic bypass valve is shown in
fi gure 2.4.
TECHNICAL DATA
0 5 10 15 20 25 30 35
0
100
200
300
400
500
600
700
800
900
1000
model - 12
model - 20
model - 30
Figure 2.2 Hot water performance of GulfStream
A-CLASS
models
(Volumes for 35 o C temperature rise and 10 o C mains inlet temperature)
Hot Water Flow Rate (1/min)
D
ra
w-off
Volume
(litr
es)
100 200 300 400 500 600 700 800 900
1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Figure 2.4 Characteristics of the automatic bypass valve
2,43
2,56
2,85
3,24
3,81
Kvs
P(bar)
Q (l/h)
0,1
0,5
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