Munters HCUw, Эксплуатация и техническое обслуживание

Страница: 6 / 122

4
c. The third and fourth hoods mount under the top 2 hoods in like fashion.
3.4 CONNECTING THE SUPPLY AIR DUCT
a. Duct connections must be completed according to U.M.C., A.M.C.A., S.M.A.C.N.A., and/or state
and local code requirements. Refer to the plans and specifications supplied with the machine.
b. This machine will require a duct from the supply air outlet to the conditioned space. The duct
should be sized appropriately and insulated. At the supply air outlet on the HCU, install a section
of flex-duct. (This will prevent the ductwork from transmitting vibrations).
3.5 CONNECTING THE CONDENSATE DRAIN
1. The unit includes a condensate drain located on the outlet of the evaporator coil. Install a proper
vented P-trap in the drain line and connect this outlet to a suitable drain. IMPORTANT: The P-trap is
vented to atmosphere by means of an open tee fitting. This tee must be left open as is. Do not cap or
extend upward from the tee.
2. The trap must be constructed according to U.M.C. and/or state and local code requirements. Refer
to the plans and specifications supplied with the machine.
3.6 ELECTRICAL CONNECTIONS
1. The electrical service entrance is through the bottom of the unit directly into the electrical panel. The
exact location is shown by a label.
2. Electrical service and control wiring must be made according to NEC and/or state and local code
requirements. Follow these codes and specifications when installing any control devices. Appendix
B shows detailed wiring diagrams for the units.
3. The HCU is designed to operate on three-phase AC at 208/3/60, 230/3/60, or 460/3/60 as specified.
Be sure the line voltage matches the voltage required by the machine.
The HCU is wired for 208 - 480 Volts. The unit can produce
enough voltage and current to cause serious injury or death.
Always turn off the power before you work inside the unit. Follow
standard lockout tag-out procedures. Do not work with the
electrical parts unless you are a trained electrician.
Be sure the unit is connected to a source with the correct line
voltage. If you connect a higher voltage than the unit can
accept, you may create a shock hazard or damage the machine.
The correct line voltage is listed on the nameplate on the
machine.
4. Bring in the main power cable from a fused disconnect through the bottom of the unit to the
disconnect inside the control panel. The fuse must be a time delay type. Unit FLA, MCA, and MOP
are shown on the Equipment Data Sheet (APPENDIX E).
4. Properly connect the chassis of the HCU to a good earth ground.
5. The unit may be wired with an interlock to the smoke detector system in the building. Please refer to
the wiring diagram
6. Before operating, check to see that the phasing is correct. With any given combination of wiring
connections for L1, L2 and L3, there is a 50:50 chance that the fans and compressors will be turning
backwards. To check for this, turn on the power to the unit momentarily and check for correct rotation
of the condenser fan. The condenser fan is mounted on the top of the unit and can be easily viewed
for rotation. If the fan is running backwards, turn off the unit and disconnect the power. Reverse any
two of the three leads to the main power terminal block. It is important that the machine not be left