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Chapter 10
CHAPTER 10 - START-UP PREPARATION
10.2. Filling the Boiler System
1. Close the boiler drain valve located on the bottom
of the unit and any manual or automatic air vents
in the system.
2. Open all system isolation valves.
3. Fill the boiler system to correct system pressure.
Correct pressure will vary with each application.
Typical residential system fill pressure is 12 psi.
System pressure will increase as system tem-
perature increases. Operating pressure of the
system should never exceed 30 psi.
4. Purge air and sediment in each zone of the boiler
system through the purge valve. Open air vents to
allow air to be purged from the zones.
5. Once the system is completely lled and purged of
all air and sediment, check the system pressure and
check/repair any leaks.
Unrepaired system leaks will cause continu-
al makeup water to be added to the boiler.
Continual makeup water will cause mineral
buildup within the heat exchanger, reducing
the heat transfer, causing heat buildup and
eventual heat exchanger failure. This can re-
sult in substantial property damage, serious
injury, or death.
10.3. INSTINCT Combi Water Heater - Water
Requirements
The thermostatic mixing valve controls the
hot water temperature delivered to the faucets.
POTENTIAL SCALD HAZARD. A mixing
valve must be installed on the INSTINCT
Combi. Removal or adjustment of the mix-
ing valve will create a potential scald hazard,
which can result in serious injury, or death.
If any adjustment needs to be made to the valve’s tem-
perature setpoint refer to the manufacturer’s instruc-
tions included with the valve.
NOTICE
WARNING
NOTICE
WARNING
General Notes
• Household water usage patterns will aect water
temperature at any faucet or shower. Occasionally
check temperature at each point of use, then adjust
the mixing valve setting accordingly. Always re-
check temperature after adjusting the mixing valve.
• Lowering the automatic mixing valve as indicated
in these instructions will reduce water temperature
levels. Consult your installer or service technician.
10.3.1 Filling the Domestic Circuit
• Never use the INSTINCT Combi unless the
circuits of the water heater are completely
filled with water.
• Failure to comply with these instructions can
result in minor property damage, or injury.
1. Close domestic water drain valve.
2. Open domestic water isolation valves slowly on the
water heater piping.
Make sure to open the domestic isolation valve
slowly to prevent any damage to the domestic
circuit flow sensor.
3. Vent air from domestic circuit by opening nearest
hot water faucet, until there is a constant ow of
water.
4. Close hot water faucet.
10.4. Check Low Water Cut-Off Device
• The INSTINCT is provided with a factory installed
LWCO device that monitors system pressure.
• Access the Boiler Information Menu by following
instructions in Section 9.14 on page 61. Scroll
down to see the current system pressure and verify
it is within the range given in Section 10.2 above.
CAUTION
CAUTION
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