Instinct Installation Manual

CHAPTER 5 - INSTINCT COMBI UNITS - DOMESTIC PIPING
25
5.3. Water Hammer
Dish washers , clothes washers and fast- closing positiv e
shut-off valves incorporated in the system all contribute
to creating water shock. Install a water hammer arrester
to prevent damage to pipes and appliances. See
device manufacturer’s instructions for application and
installation.
NOTICE
Water hammering within the domestic piping
system can cause premature failure of the do-
mestic circuit of the boiler. This type of failure is
NOT covered under warranty.
5.4. Vacuum Breaker
Installing a vacuum breaker on the domestic cold water
inlet will prevent damage to the domestic circuit if a
negative pressure is developed in the domestic supply
line. See manufacturer’s instructions for application
and installation of the vacuum breaker.
5.5. Hydro-Block
The domestic circuit provides domestic hot water
thr ough a h y dr o -block . I t is made of a plate -t o -plat e
heat exchanger and connections to the primary and
domestic piping . W ater heat ed in the pr imar y cir cuit
(central heating) flows into the plate-to-plate heat
exchanger, which in turn heats the domestic water
flowing through it in its own circuit. Refer to Fig. 13 for
flow diagram.
5.6. General Piping
• For domestic water piping diagrams, see Fig. 18 on
page 33 .
• All plumbing must meet or exceed all local, state
and national plumbing codes.
• Use pipe dope or tape suitable for potable water
systems.
• Use isolation valv es t o isolat e syst em components .
• Use dielectric unions or couplings to protect
hot and cold water fittings from corrosion when
connecting dissimilar materials such as copper and
galvanized iron pipe.
• When the water supply pressure is higher than
70
psig , it is r ecommended t o install a pressur e
reducing valve on cold water supply line to prevent
water loss through T&P relief valve.
5.7. Thermostatic Mixing Valve
A thermostatic mixing valve must be installed in the
DHW circuit.
The operating range of the thermostatic mixing is 85ºF
[30ºC] to 150ºF [65ºC].
F or applications with a domestic r ecir culation loop , the
recirculation pump should be controlled by an aquastat.
The maximum recommended setting of the aquastat is
10ºF lower than the thermostatic mixing valve setting.
If any adjustment needs to be made to the valve’s
temperature setpoint, refer to the manufacturer’s
instructions included with the valve.
DANGER
For proper operation of the thermostatic mixing
valve and to prevent potential scalding hazards,
the recirculation loop should be controlled by an
aquastat. DO NOT use continuous recirculation.
Failure to comply with this instruction will result
in serious injury, or death.
CHAPTER 5