User Guide

CHAPTER 5

CHAPTER 5 - INSTINCT COMBI UNITS - DOMESTIC PIPING

5.3. Water Hammer

Dishwashers, clothes washers and fast-closing positive

shut-o valves incorporated in the system all contrib-

ute to creating water shock. Install a water hammer ar-

rester to prevent damage to pipes and appliances. See

device manufacturer’s instructions for application and

installation.

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.

NOTICE

Fig. 16 - INSTINCT Combi - Hydro-block Flow Diagram

5.4. Vacuum Breaker

Installing a vacuum breaker on the domestic cold wa-

ter inlet will prevent damage to the domestic circuit if

a negative pressure is developed in the domestic sup-

ply line. See manufacturer’s instructions for application

and installation of the vacuum breaker.

5.5. Hydro-Block

The domestic circuit provides domestic hot water

through a hydro-block. It is made of a plate-to-plate

heat exchanger and connections to the primary and

domestic piping. Water heated in the primary circuit

(central heating) ows into the plate-to-plate heat ex-

changer, which in turn heats the domestic water ow-

ing through it in its own circuit. Refer to Fig. 16 below

for ow diagram.

CH SUPPLY

CH RETURN

to PUMP

DHW SUPPLY

DHW INLET

Flow Sensor

DHW Temperature Sesnor

1”

1” 3/4”

3/4”

1”

Stepper motor + cartridge

Plate-to-plate heat exchanger