Product data

APPLICATION DATA (cont)
CHANGE IN INDOOR UNIT PISTON SIZE
FOR ELEVATION
OUTDOOR UNIT ABOVE INDOOR UNIT
Ft Piston Change
0-25 0
26-50 −3
51-75 −5
76-100 −7
101-125 −9
126-150 −10
INDOOR UNIT ABOVE OUTDOOR UNIT
Ft Piston Change
0-25 0
26-65 +4
f) Liquid line solenoid and tubing configuration —
The solenoid has a flow arrow stamped on the
valve body. When the valve is closed (not ener-
gized) and pressure is applied in the direction of
the flow arrow, complete shut off will occur. If pres-
sure is applied against the direction of the arrow,
leakage through the valve will occur. When deter-
mining the proper location for a solenoid in a sys-
tem liquid line, consider both flow direction and
location of the valve in the system. See the dia-
gram below for proper location, and install as
follows:
Horizontal configuration (see figure below) —
• Install a liquid line solenoid valve within 2 ft of
the fan coil with the flow arrow pointing toward
the indoor unit if equivalent ft of piping is 100 ft
or more.
• Slope the vapor line toward the indoor unit to
provide for refrigerant migration protection dur-
ing the off cycle due to temperature differences
caused by slight elevation changes between in-
door and outdoor units.
NOTE: When installing a liquid line solenoid, a
low-voltage transformer may be required.
Elevated configuration — Indoor unit installed above
the outdoor unit (see figure at right):
• If there is over 25 ft of lift, a solenoid valve is re-
quired in the liquid line.
• The maximum elevation difference is 65 ft, and the
maximum equivalent ft of piping is 200.
• Install an inverted trap in the vapor line. The top of
the trap must be above the top of the fan coil. This
prevents the refrigerant from collecting in the va-
por line.
Lowered configuration — Indoor unit installed below
the outdoor unit (see figure below):
• For lines shorter than 100 ft, no solenoid valve is
required in the liquid line. For lines over 100 ft, in-
stall a solenoid valve in the liquid line.
• The maximum elevation difference is 150 ft, and
the maximum equivalent ft is 200.
g) Additional charge — The unit should be charged
by weighing in the appropriate charge. Add
charge based on the actual length of line which is
over 15 ft of liquid line. Add 0.58 oz of refrigerant
per 1 ft increase over the 15 ft line to the charge
listed in System Piston Guide and Refrigerant
Charges table on page 43.
LEGEND
FCU — Fan Coil Unit
OU — Outdoor Unit
Horizontal Configuration
*Systems with 619E009,012.
†Systems with 619C, 619F, and
619E018,024.
LEGEND
FCU — Fan Coil Unit
OU — Outdoor Unit
Solenoid Valve
(if used)
*Systems with 619E009,012.
†Systems with 619C, 619F,
and 619E018. Pumping liquid
down compensates for pres-
sure build-up by using a
smaller piston size at the
FCU.
LEGEND
OU — Outdoor Unit
FCU — Fan Coil Unit
Solenoid Valve
(Required)
*Systems with 619E009,012.
†Systems with 619C, 619F,
and 619E018. Pumping liquid
up compensates for pressure
drop by using a larger piston
size at FCU.
Elevated Configuration — Indoor Unit
Installed Above the Outdoor Unit
Lowered Configuration — Indoor Unit
Installed Below the Outdoor Unit
45