Gree GRS-1.5/D150ANbA-K, Service Manual

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GREE AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
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to the drawing tightly and then lead to drainage hose to proper place for discharge.
3.5 Water pipe connection
(1) Pipeline preparation
Adopt the special pipe for the hot water exit pipe of water heater. S2.5 series PPR pipe with the
external diameter of dn20 are suggested. If adopt other similar insulated pipe materials, you can select it
by referring to above external diameter and the pipe thickness. Aluminium pipe are not suggested to be
adopted.
(2) Installation of water inlet pipe and water outlet pipe of water tank
The water inlet pipe must be installed with safe device, strainer and cut-off valve, and the installation
sequence must be the same with the sketch map of unit installation. A cut-off valve must be installed on
the water outlet pipe.
For the convenience of drainage or clean for water tank, you are suggested to install a three-way
valve and a cut-off valve at the water outlet of water tank; if the water tank is far away from the water using
point (hot water pipe is more than 20m) or the hot water using point is lower than the cold water inlet of
water tank, three-way valve and cut-off valve must be installed.
(3) Installation of drainage pipe
Take out the choke plug of drainage outlet, and then connect the drainage outlet and the floor drain
with pipeline. The position for the connection end for drainage pipeline and floor drain should be lower
than the bottom part of water tank; otherwise, the water can
’t drained completely. A cut-off valve must be
installed at the drainage pipeline, and the cut-off valve must be installed at the position where is
convenient for the operation.
(4) Installation of Safety valve
The safety vale (
“→”
indicates the direction to the water tank) supplied with the unit shall be
connected to the inlet of the water tank via a stub of PPR as Fig 4-5 is shown. The other end of the safety
valve is connected with running water pipe. To ensure usage safety, sequence in Fig 6-1 shall be strictly
obeyed.
Cut off valve or check valve (one-way valve) shall not be installed between safety valve and the water
tank, otherwise, safety valve shall not work normally, water tank error might occur.
During heating operation process, safety valve dripping water is a normal phenomenon of pressure
relief. Under standby status, if the safety valve keeps dripping water, please check if water pressure is too
high (not over 0.7MPa). If water pressure is higher than 0.7MPa, install stabilizing valve correctly
according to
“
(6) Stabilizing valve installation
”
; if water pressure is below 0.7MPa, please check and
replace safety valve.
Safety valve must install diversion tube and be reliably fixed to prevent falling off; lead the drainage
hose to floor drain downward naturally and properly without bending or any twine. After that, the surplus
hose must be cut to avoid water in drainage hose getting frozen due to blocking of drainage or low
temperature.
To avoid any inconveniences or property losses due to water leakage or safety valve discharging