5.4 – Electric Heaters
- Ensure that the heater has been connected in
accordance with the instructions of the supplier. The
diagram is located on the inside of the connection
module.
- Check the heater current.
- Check if the safety devices shown in the wiring
diagram have been installed.
- Check if the heater has been earthed in accordance
with local instructions.
- The electric heater will be switched on if there is no
air flow rate across the heater exists.
- Ensure that no objects have been left in the heater
section.
- The following warning labels are attached to the
panel: electrical voltage and hot surface.
5.5 – Cooling Coil
When calculating trap depth on draw-thru or blow-thru
applications, remember that it is not the total static
pressure but the upstream or downstream static
resistance that is trapped against.
When calculating the trap depth for a cooling coil
condensate pan on the draw-thru side, trap against the
coil pressure drop in that coil section and any other
pressure drops upstream of it (Negative Static
Pressure).
Condensate Drain, Draw-Thru Trapping
To determine the trap dimensions for blow-thru units,
find the coils maximum positive pressure and add 1/2
inch. This figure is normally the fan total static
pressure.
Condensate Drain, Blow-Thru Trapping
- Check the connections in accordance with the
dimensional drawing.
- Control the connections for leaks.
- Check U- trap dimension according to above details.
- Insure no damage in fins. Correctly straighten the fins
- After several days of cooling operation check the
condensate drain and operation of the U trap, if
necessary clean it.
5.6 - Heat Recovery Wheel
- Check that the wheel is rotating in the correct
direction. This is indicated by an arrow on the casing.
- Check if the wheel seals are fitting correctly.
- Check if belt tension is correct.
- Check if the motor has been correctly connected.
- Check if the controller has been correctly connected
and set in accordance with the instructions of the
supplier if any.
- Check if the rotor speed has been set correctly.
- The following warning label is attached to the panel:
rotating parts.
5.7 - Plate Heat Exchanger
Used if dampers are installed.
- Check if the actuator motor has been installed in
accordance with the instructions of the supplier.
- Check if the correct angle has been set.
- Check if the dampers close correctly.
- Check if the damper can open to the correct position.
- Check operation after the power has been restored
following a power cut. Some dampers must be open,
others must be closed.
- Insure no damage in fins. Correctly straighten the
fins.
5.8 – Fan and Motor
- Remove the transport brackets. This is indicated by a
label on the fan access door.
- Untighten spring isolator bolt
- Check if the fan can move freely without obstructing
the frame, flexible connection or wiring.
- Insure power connection is star / Delta for motors
above 5.5 kW
- Check and/or connect the motor in accordance with
local instructions and the data of the supplier.
- Check the direction of rotation of the impeller. The
direction is indicated on the fan casing by an arrow.
- Separately measure the current draw of the electric
motor for all phases. The current draw of all phases
must be approximately the same and agree with the
NSP = Negative Static Pressure
(in Pa)
L = Overall trap height
A = (NSP/250*25.4) + 50 (mm)
B = NSP
L = A + B + Pipe diameter
TSP = Total Static Pressure
(in Pa)
A = 50 mm (minimum)
B = (TSP/250*25.4) + 50 (mm)
L = A + B + Pipe diameter
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