Page 20
MS8C / MS8H (208-230V)
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To Access Service Port:
A service port cap protects the service port core
from contamination and serves as the primary
leak seal.
1. Remove service port cap with an
appropriately sized wrench.
2. Connect gauge set to service port.
3. When testing is complete, replace service
port cap and tighten as follows:
*
With torque wrench: Finger tighten and torque cap per table
5.
* Without
torque wrench: Finger tighten and use an appropri
ately sized wrench to turn an additional 1/6 turn clockwise.
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Reinstall Stem Cap:
Stem cap protects the valve stem from damage
and serves as the primary seal. Replace the
stem cap and tighten as follows:
*
With Torque Wrench: Finger tighten, then
torque cap per table 5.
*
Without Torque Wrench: Finger tighten,
then use an appropriately sized wrench
to turn an additional 1/12 turn clockwise.
TIGHTENING SERVICE VALVE CAPS
FIGURE 33
USING MANIFOLD GAUGE SET
When checking the system charge, only use a manifold
gauge set that features low-loss, anti-blow-back fittings.
Manifold gauge set used for HFC-410A refrigerant systems
must be capable of handling the higher system operating
pressures. The manifold gauges should be rated for:
* High
side — Pressure range of 0 - 800 pound-force per
square inch gauge (psig)
*
Low side — Use with 30” vacuum to 250 psig with
dampened speed to 500 psig
*
Manifold gauge set hoses must be rated for use up to
800 psig of pressure with a 4000 psig burst rating.
Line Set Requirements
This section provides information on installation of the
field-provided line set.
LINE SET INSTALLATION
Field piping consists of two lines from the outdoor unit to the
indoor unit. Use field-fabricated line set with flare
connections and sizes as listed in table 12.
Seal and isolate the opening where the bundle (including
refrigerant lines) passes through so vibration is not
transmitted to the building. Pay close attention to line set
isolation during installation of any HVAC system. When
properly isolated from building structures (walls, ceilings.
floors), the refrigerant lines will not create unnecessary
vibration and subsequent sound. Line set must be
insulated.
LINE SET LENGTH AND ELEVATION
Capacity is based on standard line set length and maximum
allowable length and elevation (table 12).
Minimum line set length for all sizes is 10 feet (3 meters).
IMPORTANT
Mineral oils are not compatible with HFC-410A
.
LINE SET CONNECTIONS
Line connections are made to the outdoor unit using
field-provided flare nuts.
Remove the service valve cover from the outdoor unit.
FLARING PROCEDURE
1. Use a tube cutter to cut the copper line set to the
required length. Cut the lines approximately 12” to 20”
(305 mm to 508 mm) longer than the estimated
required length.
2. Use a pipe reamer or file to remove burrs at the end of
the line set.
BEFORE
AFTER
DE-BURRING LINE SET
FIGURE 34
3. Remove flare nut from outdoor unit and slide it onto the
copper tube.
4. Use a flaring tool to flare the end of the copper tube.