ECR International UNHV09, Инструкция по установке, эксплуатации и обслуживанию, Страница: 37 / 44

37
Troubleshooting Wiring
- refer to wiring diagram
supplied equipment. See See “Electrical Wiring” on page
15.
• Wiring diagram is located on inside surface of left end
cap.
• If you are unable to locate the wiring diagram, please
call technical service at (800) 228-9364. Have full
model and serial number available prior to calling.
Wiring Requirements
EMI Ductless Series air handlers are designed to operate
with EMI Ductless Series condensers.
• Air handler (indoor unit) and condenser (outdoor unit)
can be independently connected to electrical service
panel and protected by separate time delay fuse
or HACR breakers. See unit name plate for correct
breaker type and size.
• Indoor and outdoor units are connected to each other
via 24v interconnect wiring.
• Transformer provides low volt power source for
controls. Interconnect wire should be at least 18 AWG.
• Refer to unit wiring diagram for interconnect diagram
that matches your system.
power Supply check
When troubleshooting first check the rating plate for proper
field voltage and breaker size.
Use a voltmeter to check incoming power supply to verify it
agrees with rating plate.
• Incoming power must not exceed nameplate voltage.
• Incoming power must not be below minimum voltage
stated on rating plate (197v for units rated 208/230v).
very low voltage power — place voltmeter across low volt
terminals SC and 24vDC(-) at indoor unit. voltage should
be 24v.
Test Mode
Test mode is available for hand held control configuration
only. Use of test mode aids in functional check of unit.
TROUbleSHOOTINg
WARNINg
Electrical shock hazard. Before removing access
panels or control covers, verify all power is
disconnect all high volt power supplies to both the
indoor unit and outdoor unit. Failure to do so could
result in injury or electric shock.
!
Have service performed by a qualified service agency.
Annual system check is recommended.
Low Voltage controls — cooling-only Unit
s
Cooling-only units utilize 4 low volt interconnecting wires
between indoor unit, and outdoor.
Air handlers with unit-mounted controls require contacts
wired to same name indoors and outdoors, COM1, COM2,
SC, and 24DC(-). COM1 and COM2 carry serial digital
communications between indoor and outdoor units. The SC
and 24vDC(-) carry Direct Current power not Alternating
Current.
Interconnect Wiring
See “Electrical Wiring” on page 15 for interconnect wiring
diagrams for both unit mounted and optional wired wall
control.
Checking voltage can be accomplished at either indoor or
outdoor unit.
24v transformer located in indoor air handler unit pro -
vides low volt control power to both indoor air handler and
outdoor condenser between SC and 24vDC(-) terminals.
This is DC voltage, use proper scale on the meter.
Electric heat applications
Units with electric heat utilize control relay located on air
handlers control board in control box.
As safety feature, auto-reset limit switch located on heater
end plate or on heater assembly interrupts power to heater
should overheat condition occur.
Each electric heat assembly is equipped with one-time fuse
link. Should electric heat temperatures rise above auto
resetting limit switch, non-resetting, one-time fuse link
opens and heater remains off. To restart, new fuse link is
required.
5 kw = 22.3 Amps
3 kw = 13.5 Amps.
Low voltage controls —optional Heat pump With
electric Heat Applications
Heat pump units with electric heat utilize up to 6
interconnecting wires between indoor, and outdoor.
Air handlers using hand held controls require contacts
wired to same name indoors and outdoors, COM1, COM2,
SC, 24vDC(-), Rv and Rv. COM1 and COM2 carry serial
digital communications between indoor and outdoor
units. SC and 24vDC(-) carry Direct Current power, not
Alternating Current. Rv and Rv carry 24 volt alternating
current to reversing valve, which is non-polarized.
Interconnect Wiring