Z series combination household (townhouse)central air conditioning unit
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5. Daily Operation and Maintenance
When adjustment and test had completed, daily operation such as turn on/off unit, switch cooling and
heating, and set parameter etc. are to be done through the manual control that installed indoor.
1) All safety protection equipments have been set before outgoing, please don’t modify them to prevent
damage to the unit.
2) On-off control of fan coil in each room should be individually operated by thermostat and 3-speed
switch installed in each room. When there is no network control between host and fan coil, after the last fan
coil is turned off, host should be stopped.
3) Don’t cut off power after the unit is stopped. If off time is too long (more than 2 days) and power
supply has been cut after stop, power should be supplied for the unit before restarting the unit to reheat the
compressor for more than 6hr ,so that the unit can operate normally.
4) Don’t put things on the unit or its accessories. Keep the space around the unit dry, clean and ventilation
well. Clean it on time when there is much dust on fin of condenser to prevent the dust from affecting the
performance.
5) Don’t block the air outlet and air inlet of indoor fan coil. Filter at air inlet should be periodically
cleaned.
6) Antifreeze must be added into water system of heat pump unit according to proportion shown in this
manual. For cooling only unit, when it is not used in winter, do drain out all water in the unit and pipeline to
avoid cracking of heat exchanger, pipes and water pump. If it is not sure whether water in pipeline has been
drained completely, antifreeze must be added into system pipeline. Don’t cut off power after the unit is off to
make automatic antifreeze operation protection effective.
7) For heat pump unit, after long time for not operation, water in the pipeline will share the same
temperature with ambient water, thus, note to anti cool wind in winter when unit is heating; to the situation of
no connected control system between host and fan coil, it is better to turn on host 5~10min before turning on
the unit for heating, then turn on indoor fan coil to heat directly after water in pipeline become warmer; when
there is connected control between host and fan coil, turn on a fan coil first and turn on host for 5~10min, turn
on the fan coil in room that needs heating after water in pipeline become warmer. These can prevent cool wind
from blowing out in the first few minutes when fan coil is just turned on.
6. Common Malfunction and Solution
When problem occurs during operation, please contact with local dealer or office.
The following phenomena are not malfunctions:
1) When cooling (heating in winter), if load is low (i.e. quantity of fan coils that operate is small),
temperature of system water will be decreased (increased) rapidly, so that antifreeze (anti high-temp)
protection may occur until water temperature return (decline) to setting temp.
2) During heating, heat exchanger will frost for surface temperature of it is lower than outer ambient
temperature and lower than 0
℃
so that heat exchanging efficiency is affected, thus the control system will
periodically defrost to melt the frost on the surface of heat exchanger.
3) When unit is used in the area where temperature in winter is below 0
℃
, if system is in standby state
(power is not cut off), and ambient temp. and system water temp. are about 0
℃
, in order to prevent water
system from freezing and damaging equipments, control system will conduct auto antifreeze operation, and
start water pump and compressor until water temperature reaches safe point.
During dealing with problems, professional personnel can remove malfunctions by referring to the
following table:
