Installation Manual
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Specifications subject to change without notice.
500
MINUTES
01234567
1000
1500
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
2000
MICRONS
2500
3000
3500
4000
4500
5000
A95424
A95424
Fig. 4 - Deep Vacuum Graph
Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. Ensure tubes are
not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are
secure and tight.
Step 7 — Make Electrical Connections
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not supply power to unit with compressor terminal box
cover removed.
Be sure field wiring complies with local and national fire, safety ,
and electrical codes, and voltage to system is within limits shown
on unit rating plate. Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit
protection device.
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability . See unit rating plate. Do not
install unit in system where voltage may fluctuate above or below
permissible limits.
NOTE: Use copper wire only between disconnect switch and unit.
NOTE: Install branch circuit disconnect of adequate size per NEC
to handle unit starting current. Locate disconnect within sight from
and readily accessible from unit, per Section 440- 14 of NEC.
Route Ground and Power Wires
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes.
Connec t Ground and Power Wires
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 5.
A14028
Fig. 5 - Line Power Connections
Connect Control Wiring- Observer
®
Wall
Connect to Observer connectio n s. Only two wires DX+, DX- (GN,
YL) to Observer capable indoor unit (furnace or fan coil) are
required. Connect C if additional grounding required (see Fig. 6).
IMPORTANT: This system requires the power supplied to the
outdoor unit, and the indoor unit, for the Wall Control to
communicate with the outdoor unit.
Connect Control Wiring- Non- Communicating
Six wires are required when connecting CVH8, HVH8, TVH8
models to non- communicating 2- stage thermostats. Use Fig. 7
For required connections. Unit is configured by factory for
Observer communicating control. To wire unit for
non- communicating control, disconnect the green (DX+) and
yellow (DX- ) wires from green plug and connect appropriate wires
to low voltage terminal block. Use wire nuts to attach thermostat
wire to low voltage choke harness (LVCH).
General Information
Use No. 18 AWG or larger color- coded, insulated (35C
minimum) wire for low voltage control wires.
All wiring must be NEC Class 2 and must be separated from
incoming power leads.
Use furnace transformer , fan coil transformer, or accessory
transformer for control power requirement of system accessories
external to the OD unit. The outdoor unit has its own transformer
power.