HEATING ENGINEER
18
E
H
D
G
F
25
C
B
A
RTQ 3S
r
boilers are designed and made for use
in central heating installations, but can also be used for
domestic hot water production if connected to a suitable
storage cylinder. Water fittings are as specified in the fol-
lowing table.
b
Allow for the dimensions of the control panel that
needs to be installed on top of the boiler.
WATER CONNECTIONS
INSTALLATION IN OLDER SYSTEMS AND SYSTEMS REQUIRING MODERNISATION
When installing these boilers in old systems or systems
requiring modernisation, always perform the following
checks:
- Make sure that the stack is able to withstand the tem-
perature of the combustion gases and that it has been
designed and made in compliance with applicable
standards. The stack must also be as straight as pos-
sible, sealed, insulated and not blocked or choked.
- Make sure that the electrical system has been installed
by a qualified electrician in compliance with applicable
standards.
- Make sure that the oil feed line and any oil storage tank
are made and installed in compliance with applicable
standards.
- Make sure that the expansion vessels are big enough to
contain the volume generated by thermal expansion.
- Make sure that flow rate, head and direction of flow of
the pumps are suitable and correct.
- Make sure that the circuit has been flushed out to
remove all sludge and lime scale, and has been vented
and seal tested.
- Make sure that a suitable water treatment system is
installed if the quality of the supply/recirculation water
so demands. (See page 20).
DIMENSIONS
RTQ 3S
35
55
70
A - Return-base distance
85
85
110
mm
B - Delivery/return centre to centre distance
455
455
552
mm
C - Flue gas discharge projection
50
50
60
mm
D - Del./ret. centre to centre distance condensation safety/
discharge
75
75
85
mm
E - System delivery
1" 1/4
1" 1/4
1" 1/2
Ø
F - System return/boiler discharge
1" 1/4
1" 1/4
1" 1/2
Ø
G - Flue pipe condensation discharge
1/2"
1/2"
1/2"
Ø
H - Instrument bulb / sensor socket
G 1/2" - Ø 16
Ø
