5
English
G Install the indoor unit more than 1 meter away from
any antenna or power lines or connecting wires used
for television, radio, telephone, security system, or
intercom. Electrical noise from any of these sources
may affect operation.
G install in a sturdy manner to avoid increased operat-
ing noise.
Table 3
* If total tubing length becomes 45 to 60 m (max.) or 45 to 70 m (max.), charge additional refrigerant (R410A) by 20 g/m.
No additional charge of compressor oil is necessary.
Max. Allowable Max. Allowable Total Limit of Limit of Elevation Required Amount
Tubing Length Tubing Length Total Tubing Length Difference of Additional
Model per unit at shipment (L1+L2) or (L1+L2+L3) (H1, H2, H3, H4) Refrigerant
(m) (L1+L2) or (L1+L2+L3) or (L1+L2+L3+L4) (m) (g/m)*
or (L1+L2+L3+L4) (m)
(m)
GRF148 20 30 (L1+L2) 30 (L1+L2) 15 –
GRF198 25 45 (L1+L2) 45 (L1+L2) 15 –
GRF248 25 45 (L1+L2+L3+L4) 60 (L1+L2+L3+L4) 15 20
GRF318 30 45 (L1+L2+L3+L4) 70 (L1+L2+L3+L4) 15 20
2-2. Embedding the Tubing and Wiring
G Before beginning embedding installation work,
consult fully with agencies or offices related to the
building’s foundation, construction, electricity, and
water.
G Wait to make connections to the embedded portion.
Each connection step is described later in this
manual.
G Securely cover the end of the embedded tubing to
prevent intrusion of dirt or moisture.
G If an embedded tube is to be left for a long time, fill
the tube with nitrogen and seal both ends securely.
If a tube is left open for an extended time, moisture
in the air inside the tubing may condense into water
droplets, and lead to water contamination of the
refrigerant circuit.
G In order to prevent insulation breakdown and ground
faults, do not allow wiring ends to come in contact
with rainwater, or be subjected to condensation or
dew.
G Apply sufficient thermal insulation to the refrigerant
tubing and drain pipes
To Next Page
Loading...
