Gree Hydro Box NRQR30L/A-T - Page 22

Hydro Box
18
No. Part's name Photo Installation instruction Purpose Remark
1
Manual
discharge valve
A
It should be installed at the
high position where is close
to the hydro box. The
discharge outlet should be
upright and face upwards.
Discharge air when
debugging the water
system.
Standard
part
2
Manual
discharge valve
B
It should be installed at the
low position where is close to
the hydro box. The discharge
outlet should be upright and
face downwards.
Discharge the water inside
the pipeline during power
off period or when
maintaining the water
system.
Standard
part
3 C valve
It should be installed at the
water outlet at the flow
direction of floor heating hot
pipe.
Please connect wires
according to wiring diagram.
Let the hot water flow into
the coil pipe of water tank.
Optional
part
4 D valve
It should be installed at the
water outlet at the flow
direction of floor heating hot
pipe.
Please connect wires
according to wiring diagram.
Make the hot water flow to
the floor heating hot pipe.
Optional
part
5
Water pump
(AC pump)
Select the suitable water
pump according to the
pressure drop of the water
way and the water flow rate
in the owner’s manual.
Make sure there's enough
water flow volume inside
the floor heating hot pipe.
Optional
part
6
Automatic
discharge valve
The highest position of the
closed-type water system
Discharge the air inside the
system automatically for
ensuring excellent heat
exchange.
Standard
part
7
Pressure-relief
valve
It should be installed at the
water replenishing outlet of
closed-type water system.
The water replenishing
should be on the backwater
way, as shown in the fig.
Make sure the water
pressure inside the system
is no more than 3bar.
Otherwise, the safety valve
inside the hydro box will
open and it will cause water
leakage.
Standard
part
8 Check valve
It should be installed at the
water replenishing outlet of
the closed-type water system
(close to the pressure-relief
valve)
Prevent the water inside
the closed-type water
system flow backwards.
Optional
part
9 Strainer
It should be installed at the
water replenishing outlet of
tap water
For filtrating the impurities
in the replenishing water.
10 Cut-off valve
The cut-off valve connected
with the tap water should be
kept open; Close the cut-off
valve at the water
replenishing outlet of
closed-type water system
after debugging.
It's used for maintenance.
11 Safety valve
Install at water outlet side of
the hydro box.
For pressure relief of the
circulating water system.
Standard
part