APR 2018
12
Hot Water Energy Storage
Unvented Cylinders
GB & NI
Installation & Maintenance Instructions for an unvented
hot water cylinder with external thermal expansion
Note:
Please refer to the specification insert sheet for performance details on individual cylinders.
PRODUCT DIAGRAMS (CONTINUED)
INDIRECT PRE-PLUMBED
B
E
L
I
H
S
J
G
N
Q
T
A
D
C
M
P
K
O
R
F
L
A 22mm Inlet control set - cold feed
B 22mm Hot water draw-off
C 22mm Tundish drain-off
D 22mm Balanced cold
E Secondary return (210L, 250L & 300L)
F 28mm Flow from boiler
G 28mm Return to boiler
H 22mm Central heating flow (Zone 1)
I 22mm Central heating flow (Zone 2 -
only fitted on twin zone)
J 28mm Return from radiator circuit
K 22mm DHW two port valve
L Immersion heater
M Filling loop flexible hose
N Wiring box
O Circulating pump
P Manual bottle air eliminator
Q Auto bypass valve
R Cold feed drain
S Thermostat
T
1/2
“ Temperature relief valve
Model Type
Capacity
(L)
Height
(mm)
Dia
(mm)
A
(mm)
B
(mm)
C
(mm)
D
(mm)
E
(mm)
F
(mm)
G
(mm)
H
(mm)
I
(mm)
J
(mm)
Single Zone
120
933
550
883
933
573
836
n/a
102
171
470
n/a
246
Single Zone
150
1120
550
1070
1120
782
1025
n/a
142
212
550
n/a
287
Single Zone
180
1308
550
1325
1308
1037
1280
n/a
142
212
550
n/a
287
Single Zone
210
1496
550
1445
1496
1157
1400
1150
277
246
685
n/a
321
Single Zone
250
1746
550
1695
1746
1407
1650
1400
277
246
685
n/a
321
Single Zone
300
2055
550
2008
2055
1720
1963
1602
383
246
790
n/a
321
Twin Zone
120
933
550
883
933
573
836
n/a
102
171
470
590
246
Twin Zone
150
1120
550
1070
1120
782
1025
n/a
142
212
550
670
287
Twin Zone
180
1308
550
1325
1308
1037
1280
n/a
142
212
550
670
287
Twin Zone
210
1496
550
1445
1496
1157
1400
1150
277
246
685
805
321
Twin Zone
250
1746
550
1695
1746
1407
1650
1400
277
246
685
805
321
Twin Zone
300
2055
550
2008
2055
1720
1963
1602
383
247
790
910
321
25˚
40˚
45˚
35˚
15˚
50˚
10˚