Air Source Heat Pump Water Heater
24
④
Take thermal insulation measures on the valves and pip joints. A
thickness of not less than 15 mm is recommended for the thermal
insulation cotton.
⑤
The thermal insulation and pressure-bearing water tank can supply hot
water only when the tap water is available.
⑥
When using hot water, ensure that cut-off valve of the cold water inlet of
the water tank is open.
9 Wiring
9.1 Wire Layout
(1) This air source water heater is class I appliance. Ensure that wire layout
is performed by professional personnel according to national wiring
rules.
(2) Ensure that a switch for all-pole disconnection is available for the fixed
lines and is directly connected to wiring terminals of the power supply.
Ensure that contactor opening distance on all poles meets the
disconnection requirements under overvoltage category III conditions.
(3) Ensure that reliable grounding measures are taken. A dedicated
grounding apparatus should be used.
(4) Use the power supply with specifications provided in the nameplate, and
use circuits dedicated for air conditioners.
(5) Copper-conductor cables must be adopted for power cables, and the
operating temperature should not greater than the stipulated value. The
diameter of the cables should be large enough. For details, refer to
Table 9-1. If the length of the power cable is greater than 15 meters,
choose a power cable with a larger cross-sectional area to prevent
problems caused overloading. Do not pull the power cable during the
installation.
(6) If the installation conditions on site change, consider using cables
whose reduced capacity can still meet site requirements, based on the
specifications of the power cables and air circuit breakers provided by
the vendor.