506162-02
Issue 0847
Page 5 of 14
2.
The valves should be k ept in the "front seated"
(closed) position. This will allow evacuation of the
refrigeration lines and the indoor coil, without
disturbing the factory charge in the outdoor unit.
3.
Follow the vacuum pum p m anufacturer's
instructions. Allow the pum p to operate until the
system has been evacuated down to 300 m icrons.
Allow the pum p to continue running for an additional
15 m inutes. Turn OFF the pum p and leave the
connections secured to the two (2) service valves.
After 5 m inutes, if the system fails to hold 500
m icrons or less, check all connections for tight fit and
repeat the evacuation procedure.
4.
Isolate the vacuum pum p from the system by closing
the shutoff valves on the gauge-set. Disconnect the
vacuum pum p.
Opening Service Valves
After evacuation of the connecting lines, rem ove the
service valve cap and fully insert the hex wrench into the
stem . A back-up wrench is required on the valve body to
open the valve stem . Back-out counterclockwise until the
valve stem just touches the coined edge.
W rench sizes:
3/8 service valve: 3/16" Hex wrench
3/4 service valve: 5/16" Hex wrench
7/8 service valve: 5/16" Hex wrench
Replace service valve cap and torque to 8-11 ft-lb on 3/8"
valves; 12-15 ft-lb on 3/4" valves; 15-20 ft-lb on 7/8" valves.
Use backup wrench on valve body when torqueing valve
cap.
Install Electrical Accessories
Refer to the instructions packaged with the accessories.
Electrical Connections
Be sure to check all local codes to determ ine that the unit
is installed accordance with local requirem ents. Consult
the National Electric Code for wire size requirem ents. Use
60
/
C wire or higher. Always provide ground connections
to the outdoor unit. Power supply m ust agree with rating
on unit nam eplate.
Provide line voltage power supply to unit from a properly
sized disconnect switch. Route power and ground wires
from disconnect switch to unit. Line voltage connections
are m ade at the line side of the contactor in the control box
of the outdoor unit. Follow the appropriate wiring diagram
attached to inside of the access panel.
Proper circuit protection recom m endations are indicated
on Unit Rating Plate. Tim e delay fuses are required to
prevent blowing due to starting current (the current in rush
when equipm ent starts is referred to as the Locked Rotor
Am ps or (LRA). A fuse of this kind properly sized will give
m axim um equipm ent protection.
Use copper wire only between disconnect switch and
unit.
Rem ove access panel to gain access to unit wiring.
Extend wires from disconnect through power wiring hole
provided and into unit control box. Flexible conduit is
required for the swing out control box feature.
Connect ground wire to ground connection in control box
for safety. Connect power wiring to contactor.
High voltage power connections to 3-phase m odels is
m ade to "Pig Tail" leads with field supplied splice
connectors.
Control W iring
The control voltage is 24 Vac. NEC Class I insulated 18
AW G is required for control wiring. For lengths longer than
150 feet, contact your local distributor for technical service.
Ensure the room therm ostat is properly installed per
instructions shipped with room therm ostat. Generally the
therm ostat should not be exposed to sunlight, drafts or
vibration and should not be m ounted on exterior walls.
Low voltage control wire connections should be m ade to
the screw connection term inal board m ounted on the
defrost control as shown. All low voltage control wiring
m ust be separated from incom ing power leads.
. . . .
ELECTRICAL SHOCK HAZARD!
Turn OFF electric power before connecting unit,
performing any maintenance or removing
panels or doors. More than one disconnect
may be required to turn off all power.
FAILURE TO DO SO COULD RESULT IN BODILY
INJURY OR DEATH.
T he unit cabinet m ust have an uninterrupted or
unbroken ground to m inim ize personal injury if an
electrical fault should occur. The ground m ay consist
of electrical wire or m etal conduit when installed in
accordance with existing electrical codes. Failure to
follow this warning can result in an electric shock,
fire, or death.