Product Conveyance Installation
11
Notes:
1.* Speed control from customer: 0~10V DC control signal from customer should be connected to terminal ‘AI’ and ‘0V’. ’AI’
for ‘+’,’0V’ for ‘-’. 1V for min speed and 10V for max speed.
2.
Speed feedback to customer: pulse type signal (duty ratio is about 50%), open collector, 1 pulses per revolution, electrically
isolated. Fan1 feedback via terminal ‘Tach’ and ‘0V’, Fan2 feedback via terminal ‘Tach2’ and ‘0V’. R (resistances, e.g. 10K)
and DC power (e.g. DC 24V) should be supplied by customer.
3.
+10V to customer: terminal ’10V’ and ‘0V’ provide a DC 10V power source(1.1 mA) .The EC fans will run at full speed if
‘AI’ and ’10V’ were short wired , but this function can’t be used at the same time with function described in item 1.
The item marked as * is must be wired by customer, and the other 2 items are optional.
3.3
Cold area operation
When operating the fan coil unit in climates where ambient temperatures could result in coil freezing, ensure that
the heating energy source is enabled, heating water is up to temperature, and heating water flow is available prior
to stating the unit. Once the unit is enabled, open the outside air damper as required. This is to prevent coil frosting
which may damage the unit. This is particularly important for units with air on coil conditions based on a high
percentage of outside air.
For units that require seasonal drainage of water from the coils, when stopping the unit, close the fresh air damper
first, isolate the power to the fan(s), and then isolate the water supply to the unit. Use the water piping drain point
to drain the water in the coils to prevent damage from potential freezing.
4.
Maintenance & Service of Product
4.1
Air Filter
Air filters should be checked and cleaned, or replaced, as necessary on a periodic basis.
Typically inspect air filters every 3 months, noting that filter cleaning and replacement frequency is dependent on
run hours and outside air quality.
The filter can be removed from the unit by sliding the filter out of the return air plenum filter track.
Filters are either washable or throwaway type. For washable filters, clean it per the manufacturer’s instructions,
dry it as required, and reassemble it back to the filter frame.
4.2
Cooling Coil and Heating Coil
1.
On an annual basis, observe for dirt accumulated on the coil heat exchanger and clean coil fins it if required
(it is recommended to clean it with the low pressure compressed air from the air outlet side).
2.
Ensure the coil fins are not damaged. Comb coil fins as required.
3.
If there is evidence that air has entered the water system, use the system air vent to bleed air out of the
system.
4.
When fan coil unit is non-use, the coil should be filled with water in summer so as to avoid rust corrosion;
water in coil should be drained out in winter so as to avoid copper pipes cracking.
5.
If any coil needs to be replaced, consult with the manufacturer.
4.3
Fan and Motor Assemblies
On an annual basis inspect the EC fan /motor assemblies.
1.
Before any work is carried out on the fan or motor, isolate the power and lockout / tagout with appropriate
warning signs.
2.
Remove the appropriate ductwork to gain access to the fan/motor assembly located in the unit’s air plenum.
3.
Check whether the fan can rotate freely.
4.
Clean the fan blades as required.
5.
The normal service life of the fan bearing used in the YECFC unit can be up to 75,000 working hours without
service. Bearings are of the sealed type.
6.
Check the tension of all motor terminals
7.
If a motor needs to be replaced, consult with the manufacturer.
