INSTALLATION PROCEDURES
The following sequence of installation steps is suggested.
1. Inspect unit and set in place.
2. Check orifice size and replace with correct size if necessary.
3. Route/install the vapor and liquid lines.
4. Connect line and leak test. Evacuate if necessary.
5. Charge system.
6. Make electrical power connections.
7. Make electrical control connections.
8. Instruct owner and operate unit.
UNIT PLACEMENT
1. Provide a base in the pre-determined location.
2. Remove the shipping carton and inspect for possible damage.
3. Compressor tie-down bolts should remain tightened.
CAUTION: Some units may have a shipping block under the
compressor feet. It must be removed before the
unit is started up. Re-tighten tie-down bolts to the
ferrules.
4. Position the unit on the base provided.
5. To reduce noise and to enhance drainage, sit unit on (4)
rubber elevating grommets provided in bulk packed acces-
sory kit model number 1SG0601. Grommets should be
positioned as shown in Figure 2.
6. Make a hole(s) in the structure wall large enough to accom-
modate the insulated vapor line, the liquid line and the wiring.
ORIFICE SELECTION
NOTE: The proper orifice must be installed in the evaporator
coil liquid connection prior to the connection of the
refrigerant lines.
WARNING: Coil (whether sweat or quick connect) is under 15
PSIG pressure. Use safety glasses and gloves
when handling refrigerants to prevent personal
injury.
Each evaporator coil will have an orifice installed in the fitting
between the liquid line connection and distributor. The orifice
is identified on a label next to the liquid connection as shown.
Sweat coils are shipped with a standard orifice in a plastic bag
attached to the liquid line connection.
The orifice that is shipped with the coil is based on the “most
sold” combination, but it may have to be changed depending
on the capacity and efficiency of the outdoor unit, elevation
differences, and/or long total line lengths. An additional ori-
fice(s) is shipped with most outdoor units in the literature packet
for the most commonly required replacement combinations.
Other sizes must be ordered from the Parts Department if
required.
Table 2 shows the orifice and charge adjustment for approved
system combinations (indoor coil/outdoor unit). See Applica-
tion Data for other piping and orifice considerations for long line
length and elevation differences.
If the orifice sizes match, nothing further is required and the
refrigerant lines may be connected per the outdoor unit instruc-
tion. However, if another orifice should be used, see the coil
instruction for details to change the orifice in the coil.
LINE INSTALLATION
Sweat-connect systems and systems with stub kits must use field
supplied, clean, dehydrated refrigerant-grade copper tubing.
Unit should be installed only with the specified line sizes for
approved system combinations (indoor coil/outdoor unit) in-
stalled with total line lengths up to 15 feet. See Application Data
for long line lengths and elevation differences.
Using a larger than specified line size could result in oil return
RUBBER
ELEVATING
GROMMETS
(4)
3 - 5
TON
UNIT
BASE
PAN
Note: Do Not block
drainage holes with
grommets.
FIGURE 2 - POSITIONING GROMMETS
RUBBER
ELEVATING
GROMMETS
(4)
2 & 2.5
TON
UNIT
BASE
PAN
FIGURE 3 - ORIFICE LABEL
LABEL
LEFT-HAND THREAD
DISTRIBUTOR
ORIFICE
LIQUID LINE FITTING
WITH #65
ORIFICE
COIL EQUIPPED
550.36-N2Y
Unitary Products Group
3
