Cold Point CNC series Посібник з монтажу, експлуатації та технічного обслуговування - Сторінка 7
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Друкувати сторінкуTable 3
Refrig. Line
Data.
09,12
Max. Line Length
100
Max. Elevation
35
10
Max. Number Bends
Liq. O.D.
1/4"
Suction O.D.
1/2"
'P' Trap (invert)
Choose a location that places the CN unit as close to
the indoor unit as possible. The maximum separation is
100 feet of piping. Use only clean refrigeration grade
tubing. Avoid piping on wet or rainy days. Always keep
the tube ends capped until you are ready to make the
final connections. Remove burrs from cut ends of
tubing. Use tube benders to avoid kinking.
Insulate the suction line with Armaflex or equivalent
with a wall thickness of at least 3/8". Support the
tubing adequately to avoid sags that can trap oil. Isolate
the tubing so as not to transmit noise to the building
structure. Avoid sharp edges that could cut the tubes.
Maximum vertical lift (compressor above evaporator) is
35 feet. Trap risers with a 'P' trap every 10 feet.
Units are supplied with a filter drier for installation in
the liquid line. Install in a convenient location. Protect
from excessive heat while brazing connections.
LEAK TEST, EVACUATION & RELEASE of
REFRIGERANT:
The CN unit is supplied with R-22 charge sufficient for
most matching evaporator units. Charge must be
added for interconnecting tubing.
The unit's service valves are shipped in the closed
position and should not be opened until final
connections and evacuation are completed.
WARNING: It is illegal to discharge refrigerant into
the atmosphere. Use proper reclaiming methods and
equipment when working on the refrigerant containing
parts of the unit. Service should be performed by a
QUALIFIED service agency and certified technicians.
The recommended procedure for leak test, evacuation,
and release of refrigerant is outlined below:
1). Complete the final piping connections to the indoor
and outdoor units using high temperature brazing alloy.
Model
18,24
30,36
48,60
100
100
100
35
35
35
10
10
10
3/8"
3/8"
1/2"
5/8"
3/4"
7/8"
Every 10' of Rise
2). Connect a charging manifold to the service ports
provided at the service valves.
3). Pressurize the lines and evaporator with nitrogen and
leak check all connections with soap bubbles. Repair as
necessary any faulty joints. If brazing is required be sure
to RELEASE THE NITROGEN FIRST. Re-test as
needed.
4). Connect a vacuum pump to the manifold center
connection, start the pump and open the manifold
valves.
5). Evacuate to 500 microns or less for a minimum of
30 minutes. Close the manifold valves and shut off the
pump. Note the vacuum reading and wait 15 minutes.
Take a new vacuum reading. A reading of 800 microns
or higher indicates the presence of moisture or a leak.
6). Repair as necessary and repeat steps 3, 4 & 5.
7). Confirm that manifold valves are closed and
disconnect the vacuum pump.
8). Remove the caps from the services valves. Using an
allen wrench open the valves to the fully 'back-seat'
position. Replace service valve caps and tighten.
INITIAL START-UP & CHECKS:
Operation of the unit is automatic and will provide
cooling depending on the setting of the thermostat.
IMPORTANT! All panels must be installed, main power
turned on and the thermostat properly connected
before operating the unit.
1). System check - set thermostat system switch to
"Off" position and fan switch to "Auto" position. Turn
the power supply breaker on.
2). Set the fan switch to "On" , blower should operate.
3). Return the fan switch to "Auto". Blower should shut
off. Set the system switch to "Cool" and lower
thermostat set point to coldest setting. The compressor,
condenser fan, and evaporator blower should all come
on. Cool air will be supplied after a couple of minutes
of run time.
4). Proceed to the 'FIELD CHARGING' section of
these instructions.
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