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Factory
High-Flow
Access Port
Service Valve
with Stem Cap
Fig. 7 - - Typical Piping Connection Assembly
Evacuation/Dehydration —
Evacuate and dehydrate the
system(s) (excluding the CAS090*G/H unit) to 500 microns
using a two-stage vacuum pump attached to the service ports
outside
the
CAS090*G/H service
description in GTAC II, Module 4, System Dehydration.
WARNING
!
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
R- - 410A refrigerant systems operate at higher pressure
than standard R- - 22 systems. Do not use R- - 22 service
equipment or components on R- - 410A refrigerant
equipment.
This unit is designed for use with R- - 410A refrigerant. Do
not use any other refrigerant in this system.
R- - 410A refrigerant is provided in pink (rose) colored
cylinders. These cylinders are available with and without dip
tubes; cylinders with dip tubes will have a label indicating
this feature. For a cylinder with a dip tube, place the
cylinder in the upright position (access valve at the top)
when removing liquid refrigerant for charging. For a
cylinder without a dip tube, invert the cylinder (access valve
on the bottom) when removing liquid refrigerant.
Because R- - 410A refrigerant is a blend, it is strongly
recommended that refrigerant always be removed from the
cylinder as a liquid. Admit liquid refrigerant into the system
in the discharge line. If adding refrigerant into the suction
line, use a commercial metering/expansion device at the
gauge manifold; remove liquid from the cylinder, pass it
through the metering device at the gauge set and then pass it
into the suction line as a vapor. Do not remove R- - 410A
refrigerant from the cylinder as a vapor.
10
Field Service
Access Port
(Schrader core)
Sweat
Connection
C10203
connected refrigeration
valves,
following
Specifications are subject to change without notice.
Preliminary Charge —
Before starting the unit, charge R-410A liquid refrigerant
into the high side of each CAS090 circuit through the
liquid service valve(s). The amount of refrigerant added
must be at least 80% of the operating charge listed in
Table 3 for LINEAR line length LESS the factory charge
quantity (if factory shipping charge has not been
removed). See example below.
Allow high and low side pressures to equalize. If pressures
do not equalize readily, charge R-410A vapor (using spe-
cial service manifold with expansion device) into the suc-
tion line service port for the low side of system to assure
charge in the evaporator. Refer to GTAC II, Module 5,
Charging, Recover, Recycling, and Reclamation for liquid
charging procedures.
Example:
CAS090*G/H (RTPF)
60-ft (18.3 m) linear line length
Equivalent line length 90-ft (27.4 m)
Liquid Lift: 20-ft (6.1 m)
Select line sizes from Table 3 (CAS090*G/H):
1
Liquid
/
in
2
1
Suction 1
/
in.
8
Charge 22.5 lbs (at 75- - ft linear length)
80% of Operating Charge:
0.80 x 22.5 = 18 lbs
Factory Shipping Charge: 14 lbs
Field-Charge quantity: 18 - - 14 = 4 lbs
For linear line lengths longer than 125 ft (38 m), contact
your local service representative for system charge value.
Step 7 — Install Accessories
Accessories requiring modifications to unit wiring should
be completed now. These accessories may include Winter
Start controls and Low Ambient controls. Refer to the
instructions shipped with the accessory.
501 01 3600 01
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