Flushing The System - Lennox XC25-024-230-01 Installation And Service Procedure

Flushing the System

LINE SET AND INDOOR COIL (1 OF 2)
TYPICAL EXISTING FIXED ORIFICE
1A
REMOVAL PROCEDURE (UNCASED COIL
SHOWN)
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR
ASSEMBLY
REMOVE AND DISCARD
WHITE TEFLON
(IF PRESENT)
A. ON FULLY CASED COILS, REMOVE THE COIL ACCESS AND PLUMBING
PANELS.
B. REMOVE ANY SHIPPING CLAMPS HOLDING THE LIQUID LINE AND DIS­
TRIBUTOR ASSEMBLY.
C. USING TWO WRENCHES, DISCONNECT LIQUID LINE FROM LIQUID LINE
ORIFICE HOUSING. TAKE CARE NOT TO TWIST OR DAMAGE DISTRIBU­
TOR TUBES DURING THIS PROCESS.
D. REMOVE AND DISCARD FIXED ORIFICE, VALVE STEM ASSEMBLY (IF
®
PRESENT) AND TEFLON WASHER AS ILLUSTRATED ABOVE.
E. USE A FIELD-PROVIDED FITTING TO TEMPORARILY RECONNECT THE
LIQUID LINE TO THE INDOOR UNIT'S LIQUID LINE ORIFICE HOUSING.
2
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
INVERTED HCFC-22
CYLINDER CONTAINS
CLEAN HCFC-22 TO BE
USED FOR FLUSHING.
A
1
VAPOR LINE
SERVICE VALVE
EXISTING
INDOOR
B
UNIT
LIQUID LINE SERVICE
VALVE
RECOVERY
CYLINDER
D
A. INVERTED HCFC-22 CYLINDER WITH CLEAN REFRIGERANT TO THE
VAPOR SERVICE VALVE.
B. HCFC-22 GAUGE SET (LOW SIDE) TO THE LIQUID LINE VALVE.
C. HCFC-22 GAUGE SET CENTER PORT TO INLET ON THE RECOVERY
MACHINE WITH AN EMPTY RECOVERY TANK TO THE GAUGE SET.
D. CONNECT RECOVERY TANK TO RECOVERY MACHINES PER MACHINE
INSTRUCTIONS.
®
TEFLON RING
FIXED ORIFICE
BRASS NUT
®
SEAL
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
GAUGE
MANIFOLD
LOW
NEW
OUTDOOR
UNIT
OPENED
CLOSED
TANK
RETURN
C
INLET
DISCHARGE
RECOVERY MACHINE
1B TYPICAL EXISTING EXPANSION VALVE
REMOVAL PROCEDURE (UNCASED COIL
SHOWN)
TWO PIECE PATCH PLATE
LIQUID LINE
(UNCASED COIL ONLY)
HOUSING
DISTRIBUTOR
TUBES
OR
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER
LINE FITTING
SENSING BULB
A. ON FULLY CASED COILS, REMOVE THE COIL ACCESS AND PLUMBING
PANELS.
B. REMOVE ANY SHIPPING CLAMPS HOLDING THE LIQUID LINE AND DIS­
TRIBUTOR ASSEMBLY.
C. DISCONNECT THE EQUALIZER LINE FROM THE CHECK EXPANSION
VALVE EQUALIZER LINE FITTING ON THE VAPOR LINE.
D. REMOVE THE VAPOR LINE SENSING BULB.
E. DISCONNECT THE LIQUID LINE FROM THE CHECK EXPANSION VALVE
AT THE LIQUID LINE ASSEMBLY.
F. DISCONNECT THE CHECK EXPANSION VALVE FROM THE LIQUID LINE
ORIFICE HOUSING. TAKE CARE NOT TO TWIST OR DAMAGE DISTRIBU­
TOR TUBES DURING THIS PROCESS.
G. REMOVE AND DISCARD CHECK EXPANSION VALVE AND THE TWO TEF­
®
LON RINGS.
H. USE A FIELD-PROVIDED FITTING TO TEMPORARILY RECONNECT THE
LIQUID LINE TO THE INDOOR UNIT'S LIQUID LINE ORIFICE HOUSING.
3
HIGH
FLUSHING LINE SET
CAUTION -This procedure should not be performed on systems
which contain contaminants (Example, compressor burn out).
THE LINE SET AND INDOOR UNIT COIL MUST BE FLUSHED WITH AT
LEAST THE SAME AMOUNT OF CLEAN REFRIGERANT THAT PRE­
VIOUSLY CHARGED THE SYSTEM. CHECK THE CHARGE IN THE
B
FLUSHING CYLINDER BEFORE PROCEEDING.
A. SET THE RECOVERY MACHINE FOR LIQUID RECOVERY AND
START THE RECOVERY MACHINE. OPEN THE GAUGE SET
VALVES TO ALLOW THE RECOVERY MACHINE TO PULL A VACU­
UM ON THE EXISTING SYSTEM LINE SET AND INDOOR UNIT COIL.
B. INVERT THE CYLINDER OF CLEAN HCFC-22 AND OPEN ITS VALVE
TO ALLOW LIQUID REFRIGERANT TO FLOW INTO THE SYSTEM
THROUGH THE VAPOR LINE VALVE. ALLOW THE REFRIGERANT
TO PASS FROM THE CYLINDER AND THROUGH THE LINE SET
AND THE INDOOR UNIT COIL BEFORE IT ENTERS THE RECOVERY
MACHINE.
C. AFTER ALL OF THE LIQUID REFRIGERANT HAS BEEN RECOV­
ERED, SWITCH THE RECOVERY MACHINE TO VAPOR RECOVERY
SO THAT ALL OF THE HCFC-22 VAPOR IS RECOVERED. ALLOW
THE RECOVERY MACHINE TO PULL SYSTEM DOWN TO 0.
D. CLOSE THE VALVE ON THE INVERTED HCFC-22 DRUM AND THE
GAUGE SET VALVES. PUMP THE REMAINING REFRIGERANT OUT
OF THE RECOVERY MACHINE AND TURN OFF THE MACHINE.
19
STUB END
CHECK
ORIFICE
EXPANSION
VALVE
®
TEFLON
RING
EQUALIZER
LINE
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
VAPOR
LINE
®
TEFLON
RING
SENSING
LINE
LIQUID
LINE
XC25