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Suction Riser
A suction riser condition exists when the outdoor unit is locat-
ed above the indoor (evaporator) unit and suction vapor must
flow vertically up to return to the compressor. Oil return is a
concern when the suction tube size is too large to produce the
minimum refrigerant velocity to ensure oil return at minimum
load conditions.
569J***A/B AND 569J***T/U
Check Table 9 for maximum suction tube size for 569J units at
minimum load conditions. Consider suction speed riser (re-
duced tube size for vertical segment only) or double suction
riser arrangement if the planned suction tube size does not pro-
vide necessary minimum flow-rates for this riser.
Table 9 — 569J Maximum Suction Pipe Size
MODEL
UNIT SIZE
569J***A/B
16-25
569J***T/U
16-28
Outdoor Unit ABOVE Evaporator Coil
This installation will have at least one suction riser segment. If
the vertical elevation difference is less than 20-ft (6.1 m) linear
feet and requires only one or two segments, consider a speed
riser selection for Circuit 1; use the line marked VAPOR RIS-
ER REQUIRED; NOT GREATER THAN 20 FT (6.1 M). See
Fig. 6. Tube S is the horizontal line size; tube A is the reduced
diameter riser size.
If the vertical elevation difference is greater than 20-ft (6.1-m)
linear feet or requires more than two short lift segments, select
the Circuit 1 suction line size from Double Suction Riser lines
data under VAPOR RISER GREATER THAN 20 FT (6.1 M).
See Fig. 7. Tube S is the horizontal line size. Tube A is the re-
duced diameter riser size without bottom trap; Tube B is the
parallel riser size with bottom oil trap.
Outdoor Unit BELOW Evaporator Coil and No Vertical Riser
Segments
Select Circuit 1 suction line size from NO VAPOR RISER line.
Circuit 2 Suction Line
No special riser selections are necessary.
Vertical Separation (outdoor unit above indoor unit)
Vertical elevation difference of 200 ft (60 m) is permitted when
the outdoor unit (569J***A/B or 569J***T/U) is located above
the indoor unit.
A
S
LEGEND
A - Suction Riser With Trap
S - Suction Line to Condensing Unit
Fig. 6 — Suction Line Piping - Speed Riser
MAXIMUM TUBE SIZE (in.)
1-5/8
1-5/8
Condensing
Unit
20-ft (6.1 m)
max
S
From
Evaporator
LEGEND
A - Suction Riser Without Trap
B - Suction Riser With Trap
S - Suction Line to Condensing Unit
Fig. 7 — Suction Line Piping - Double Riser
Step 6 — Complete Refrigerant Piping
Connections
IMPORTANT: DO NOT BURY REFRIGERANT LINES.
IMPORTANT: A refrigerant receiver is not provided with the
unit. Do not install a receiver.
PROVIDE SAFETY RELIEF
If local codes dictate an additional safety relief device, purchase
locally and install locally. Installation will require the recovery
of the factory shipping charge before the factory tubing can be
cut and the supplemental relief device is installed.
Model 569J***T/U has two separate refrigeration systems. If
required, each circuit will require a field-supplied/installed
supplemental relief device.
CHECK 569J MODEL WITH EVAPORATOR COIL
CONNECTIONS
Confirm before installation of unit that the evaporator coil con-
nections are consistent with this 569J model. See Table 3 on
page 3.
INSULATE SUCTION LINES
Apply closed-cell tubular insulation to all suction lines be-
tween evaporator coil connection and 569J unit's suction ser-
vice valve.
569J***T/U PIPING CONNECTIONS
The 569J***T/U unit's two circuits are designated Circuit 1
and Circuit 2. Circuit 1 is controlled by the thermostat's Y1 (or
TC1) contact and will be the first circuit on and last circuit off.
Circuit 2 is controlled by the thermostat's Y2 (or TC2) contact
and this circuit is always the "lag" circuit.
See Fig. 8 for location of Circuit 1 and Circuit 2 service valves
and field piping connections. Circuit 1 is on the right-hand side
of the service valve compartment; Circuit 2 is on the left.
11
A
B
S
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