Caution
This boiler is not for use in systems where water is constantly
or frequently replenished. Minerals such as calcium in make-
up water can deposit on heat exchanger causing overheating,
and eventually the boiler will leak. This type of failure is not
covered by warranty. Water must not be drained from system
for use by cleaning personnel. Do not draw water from boiler
for any purpose.
Caution
The boiler warranty does not cover leaks resulting from
corrosion caused by the use of underfloor plastic tubing
without an oxygen diffusion barrier. Such systems must have
the non-oxygen diffusion barrier tubing separated from the
boiler with a heat exchanger. Viessmann recommends the use
of underfloor plastic tubing with an oxygen diffusion barrier.
Note:
A minimum of 2˝ clearance from non-insulated hot water pipes
to combustible construction must be maintained. In cases
where the pipes are insulated with pipe insulation of
appropriate and sufficient thickness and insulation values, the
above clearance may be reduced to 0˝.
Caution:
For underfloor heating applications, an additional immersion or
strap-on aquastat must be installed in the low temperature
underfloor loop (ahead of the mixing valve) to de-energize the
pump and/or boiler in the event of overheating. Too high a
water temperature can cause damage to concrete slabs.
24
Warning: Failure to correctly install the pilot burner will cause dangerous flame roll-out from
the main burners. The worst flame roll-out will occur with propane gas. Flame roll-
out can cause property damage or severe personal injury.
11.0
Checklist for proper installation
Before and after installation, use the following checklist to ensure proper installation. Improper installation could create a
hazard, resulting in damage, severe personal injury, or loss of life. The correct answer is “yes” to all of the following
questions.
a)
Is the flow direction correct?
❒
Yes
❒
No
Water flows in at bottom connection and out at top 2˝ connection?
b)
Are both the supply and return on the same side of the boiler?
❒
Yes
❒
No
c)
Is the return water distribution pipe (double flange connection) used as the return connection?
❒
Yes
❒
No
d)
Is the pilot on the same side of the boiler as the nipple used for the gas train connection?
❒
Yes
❒
No
e)
Is the 5-point well with control capillaries in the sensing tapping nearest the supply connection?
❒
Yes
❒
No
f)
Is there a low water cut-off installed?
❒
Yes
❒
No
g)
Is the gas supply pressure at the boiler gas train between 14 and 7 ˝w.c.?
❒
Yes
❒
No
h)
Is the manifold pressure 3.5 ˝w.c. for natural gas operation with the pilot
and main burners operating?
❒
Yes
❒
No
i)
Is the pilot pressure for natural gas operation between 5 and 6 ˝w.c. with pilot running?
❒
Yes
❒
No
j)
If the RS boiler has been installed in an older piping system, has it been flushed out to ensure
debris, scale, rust and sludge will not settle in boiler?
❒
Yes
❒
No
k)
Are all pressure measurement taps installed and tightened?
❒
Yes
❒
No
l)
Are all main burners installed with ports facing up?
❒
Yes
❒
No
