Pipe Anti-Freezing - Huawei FusionModule1000A20 Installation Manual

FusionModule1000A20 IT Solution
Installation Guide (2016.05, AI Version)
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2.7 Pipe Anti-freezing

Condensate drainpipes of air conditioners and water refill pipes of humidifiers may freeze and
thereby be blocked or crack in low-temperature areas. Anti-freezing measures must be taken
for the pipes.
Wrap the pipes with an electric trace heater, starting from the water refill and drain ports on a
container to the frozen soil layer. Bury the remaining pipes underground (the temperature at a
specific depth underground is always above 0° C).
Figure 2-1 Pipe anti-freezing solution
(1) Soil
(3) Temperature sensor
(5) Electric trace heater
(7) Drainpipe
Issue 02 (2017-01-10)
Anti-freezing measures must be applied for pipes in low-temperature areas. For details,
see 2.7 Pipe Anti-freezing.
 Prepare traps for container drainpipes.
 The ends of the drainpipes must be connected to the utility drainpipes.
 After an electric trace heater is deployed, wrap 10 mm thick thermal insulation foam around the
pipes.
 The thermal switch and electric trace heater should be powered separately. As recommended, the
thermal switch should be an outdoor model and its working temperature range and protection level
should meet local climate requirements (low temperature resistant and rainproof). If the
recommended thermal switch is unavailable, place a thermal switch in the position where the
temperature range and protection level are met, for example, inside an outdoor control box with
electric heating.
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Typically, a thermal switch consists of a temperature controller and temperature sensor. The
temperature sensor is deployed in a position such as the pipe surface where antifreeze measures are
required. Set the temperature to 5° C as recommended. When the temperature decreases to 5° C or
lower, the temperature sensor will send a signal to the temperature controller, which will release a
command to start the electric trace heater. The electric trace heater will be closed until the
temperature of the pipe surface rises to 5° C or higher.
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(2) Temperature control switch
(4) Trap
(6) Water supply pipe
2 Site Requirements
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