186CNV / 284ANV: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
36
A88342
Fig. 33 – Reversing Valve
(Cooling mode or defrost mode, solenoid energized)
A88341
Fig. 34 – Reversing Valve
(Heating Mode, solenoid de-energized)
Liquid Line Filter Drier
Filter driers are specifically designed for R-22 or Puron refrigerant.
Only operate with the appropriate drier using factory authorized
components.
It is recommended that the liquid line drier be installed at the indoor unit
for all models except 5 Ton. Since the potential of refrigerant line
pulsations from vapor injection exists, install 5 Ton filter drier at outdoor
unit. Not all applications will experience this pulsation.
Install Liquid-line Filter Drier Indoor
Refer to
and install filter drier as follows:
1. Braze 5 in. liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to 5 in. long liquid tube from step 1.
4. Connect and braze liquid refrigerant tube to the filter drier.
A05227
Fig. 35 – Liquid Line Filter Drier - 2/3/4T Applications
A200082
Fig. 36 – Liquid Line Filter Drier for 5 Ton Applications
Suction Line Filter Drier
The suction line drier is specifically designed to operate with Puron®
Refrigerant, use only factory authorized components. Suction line filter
drier is used in cases where acid might occur, such as burnout. Heat
pump units must have the drier installed between the compressor and
accumulator only. Remove after 10 hours of operation. Never leave
suction line filter drier in a system longer than 72 hours (actual time).
Thermostatic Expansion Valve (TXV)
All fan coils and furnace coils will have a factory installed thermostatic
expansion valve (TXV). The TXV will be a bi-flow, hard-shutoff with
an external equalizer and a balance port pin. A hard shut-off TXV does
not have a bleed port. Therefore, minimal equalization takes place after
shutdown. TXVs are specifically designed to operate with Puronr or
R-22 refrigerant, use only factory authorized TXV’s.
Do not
interchange Puron and R-22 TXVs.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or
improper operation.
To avoid performance loss and compressor failure, installation of filter
drier in liquid line is required.
FROM INDOOR COIL VIA
SERVICE VALVE ON
OUTDOOR COIL
TO
ACCUMULATOR
TO OUTDOOR
COIL
TP-4
TP-3
TP-2
TP-1
FROM COMPRESSOR
DISCHARGE LINE
TO INDOOR COIL
VIA SERVICE VALVE
ON OUTDOOR COIL
TO
ACCUMULATOR
INSULATE
FOR
ACCURATE
READING
FROM
OUTDOOR
COIL
TP-4
TP-3
TP-2
TP-1
INSULATE FOR
ACCURATE
READING
FROM COMPRESSOR
DISCHARGE LINE
ELECTRONIC
THERMOMETER
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or
improper operation.
To avoid filter drier damage while brazing, filter drier must be wrapped
in a heat-sinking material such as a wet cloth.
EXTERIOR WALL
TO DWELLING
LIQUID LINE
FILTER DRIER
