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Heating Piston (AccuRater
r) -- Heat Pumps Only
In this product line, AccuRater pistons are used to meter refrigerant
for heat pump heating mode only. All indoor coils are supplied
with a bi--flow TXV for metering in the cooling mode.
AccuRaterr piston has a refrigerant metering hole through it. The
piston seats against the meters refrigerant in to the outdoor coil in
heating and allows refrigerant to flow around it in cooling mode.
There are 2 types of liquid line connections used. Flare connections
are used in R--22 systems.
1. Shut off power to unit.
2. Pump unit down using pumpdown procedure described in
this service manual.
3. Loosen nut and remove liquid line flare connection from
AccuRaterr.
4. Pull retainer out of body, being careful not to scratch flare
sealing surface. If retainer does not pull out easily, carefully
use locking pliers to remove it.
5. Slide piston and piston ring out by inserting a small soft
wire with small kinks through metering hole. Do not
damage metering hole, sealing surface around piston cones,
or fluted portion of piston.
6. Clean piston refrigerant metering hole.
7. Install a new retainer O--ring, retainer assembly, or Teflon
washer before reassembling AccuRaterr.
A05226
Fig. 17 – Front Seating Service Valve with Chatleff
Connection Used in Legacy RNC, Legacy Line, and 4--Sided
Preferred and Evolution Puron Heat Pumps.
TEFLONr SEAL
SWEAT/ FLARE
ADAPTER
PISTON
BODY
PISTON
A05226
Fig. 18 – Back Seating Liquid Service Valve
Used in 3--Sided Preferred and Evolution Heat Pumps
(all Puron)
PISTON BODY
PISTON
PISTON
RETAINER
SWEAT/FLARE ADAPTER
A01019
Fig. 19 – AccuRaterr Components
(usedinR--22HeatPumps)