LAARS Mini-Combo II MCS - Install and Operating Manual - Manual (Page 5)

Mini-Combo II Page 5
2.3 Piping
• To Prevent damage to the unit, all soldering is to be
done prior to assembling the cold and hot water,
and any other connections to the tank.
• Use suitable pipe dope or tape.
• Before piping the boiler to the heating system,
be sure to install the system check valve (provided
with the unit) onto the inlet (return)
tee of the boiler with arrow pointed downward (see
Figure 3).
• If anti-freeze is used in boiler system, local codes
may require a backflow preventer on cold supply
line. Use anti-freeze specifically intended for
hydronic heating system. Inhibited propylene
glycol is recommended.
WARNING
Do not use automotive or ethylene glycol anti-freeze,
or any undiluted anti-freeze. This can cause severe
personal injury, death or substantial property damage.
AVERTISSEMENT
N’utilisez pas d’antigel de moteur ou à base d’éthylène
glycol ou toute sorte d’antigel dilué. Il peut en résulter
des blessures personnelles, la mort ou des dégâts
matériels substantiels.
If a backflow preventer, pressure reducing valve or
check valve is in cold water supply, install an expansion
tank on cold water supply line (Figure 4) to prevent
normal thermal expansion from repeatedly forcing open
the Temperature and Pressure (T&P) relief valve.
T&P relief valves discharge piping must be directed
so that hot water flows away from all persons. Attach
run-off tube to T&P valve and run tube within 6"
(152mm) from floor. No reducing couplings, valves, or
any other type of restriction is to be installed in this line.
This run-off tube must be installed to allow free and
complete drainage of both valve and run-off tube.
Filling Storage Water Tank
1. Open hot water faucet in house to allow air in the
tank and in piping to escape.
2. Open shut-off valve(s) in cold water supply line.
3. Open shut-off valve(s) in hot water supply line.
4. When water discharges from the faucet, close it.
Check for system leaks and repair if necessary.
Filling and connecting boiler pipes:
Consult the JV boiler manual, Document 1025.
CAUTION
Never use water heater/boiler unless it is completely
filled with water.
ATTENTION
N’utilisez jamais le chauffe-eau/chaudière s’il n’est pas
complètement rempli d’eau.
2.4 Wiring
Priority System: Under this wiring the storage tank
will be supplied before space heating. This will insure
that it gets adequate hot water flow from the boiler to
maintain a fully rated delivery of domestic hot water.
CAUTION
In this priority mode, any demand for space heating is
postponed until the storage water tank has reached
set temperature. This delay in supplying the space
heating zones is usually not noticed by the inhabitants
of the living spaces. However, in the event of certain
storage water tank malfunctions, space heating could
be delayed indefinitely. If undetected and uncorrected,
freezing damage to piping could result.
ATTENTION
Dans ce mode de priorité, toute demande de
chauffage est retardée jusqu’à ce que le reservoir à
eau ait atteint la température pré-réglée. Ce retard
n’est normalement pas ressentie pas les habitants des
zones habitables. Cependant, dans le cas d’un
mauvais fonctionnement du réservoir d’eau, le
chauffage pourrait être retardé indéfiniment. Si ce
problème n’est pas détecté et corrigé, la tuyauterie
pourrait geler.
WARNING
Electrical shock can cause severe personal injury or
death. Disconnect power supply to the boiler before
doing any electrical work.
AVERTISSEMENT
Les chocs électriques peuvent causer des blessures
corporelles graves voire la mort. Débranchez la
chaudière avant de commencer les travaux
d’électricité.
Net Free Area - square inches sq. mm
Model Inside Air Outside Air
MC50 100 645 15 97
MC75 100 645 20 129
MC100 100 645 25 161
MC125 125 807 32 207
Area indicated is for one of two openings: One at floor level and
one at the ceiling, so the total free area would be double the figures
indicated. Refer to Document 1025 for more information
Table 1. Minimum Recommended Air Supply.