12
Complete Outdoor Refrigerant Piping Conn ec-tions
Followthe following general guidelines:
1. Use refrigerantgrade field– supplied tubing.
Refer to Table4 for the correct line sizes.
2. Do not use lessthan 10 ft (93.05 m) of interconnecting
tubing.
CAUTION
!
UNITDAMAGE HAZARD
Failure to follow this caution may result in equipment
damageor improper operation.
Ifany section of pipe is buried,there must be a 6 in. (152.4
mm) verticalrise to the valve connections on the outdoor
unit. If more than the recommended length is buried,
refrigerantmay migrate to cooler, buried sectionduring
extended periods of system shutdown. This causes
refrigerant slugging and could possibly damage the
compressor at start--up.
When morethan 80 ft (24.4 m) of interconnectingtubing is used,
consultthe Duct--FreeSplit System Long Line Application Guide
for required accessories.
3. On cooling only units, insulate the liquidline. On heat
pumps, insulateboth lines. A minimum of 1/2 inch foam
pipeinsulation is recommended.
4. Run the refrigerant tubesas directly as possible and avoid
unnecessaryturns andbends.
5. Suspend refrigeranttubes to avoid damageto insulation or
tubesso they do not transmitvibration to the structure.
6. When passingrefrigerant tubes through the wall,seal the
openingso rain and insectsdo not enter the structure.Leave
some slackin refrigerant tubes betweenstructure and out-
doorunit to absorb vibration.
NOTE: A fusible plug is locatedin unit suction line; do not cap
thisplug. If local codes requireadditional safety devices,install as
directed.

Connection at Outdoor Unit

CAUTION
!
UNITDAMAGE HAZARD
Failure to follow this caution may resu lt in equipment damage
orimproper operation.
To prevent damage to unit or service valv es observe the
following:
SAb razing shield MUST be used.
SWrapservice v alves with wet cloth or use a heat sink
material.
1. Braze the connectortubes (field supplied for the 38HDR
unitsand factory supplied forthe 38QRR units) to the inlet
of the factory supplied filter drier. If a cooling only unit is
being installed move to step 3 (see Fig. 8).
2. Remove the plasticcap from the liquid and suction service
valve on the 38QRR unit an d assemble the heating piston
and pistoncap supplied with the outdoor unitas shown in
Fig.16.
NOTE: Teflon Seal must face toward the outdoor heat pump unit.
A09538
Fig. 16 -- AccuRater Metering Device at Serv ice
Valve(Bypass TypeComponents),
HeatPump Systems Only
NOTE:TheTeflon seal on thepiston should point towards the
liquidservice valve.
The size of the factory supplied piston might have to
adjustedfor long line applications(over 80 ft / 24.4 m).
Referto the Duct Free Long Line ApplicationGuide
for additional information.
3. On 38HDR units, remove theplastic caps on the liquid and
suction service valves. B raze the completed filter drier as-
sembly (from Step 1) to the liquid service valve. On the
38QRR unit, connect the co mpleted filter drier assembly
(from Step 1) to the piston cap.
4. Braze the field supp lied line set to the filter drier assembly
andtothesuctionvalve.
5. Insulateany exposed areas between the filter drier and the
liquidvalve.
CompleteOutdoor Power and Control Wiring
!WARNING
ELECTRICALSHOCK HAZARD
Failureto follow thiswarning could result in personalinjury or
death.
The unit cabinet must have an uninterrupted or unbroken
groundto minimize personal injuryif an electricalfault should
occur. The ground may consist of electrical wire or metal
conduit when installedin accordance with existing electrical
codes.
CAUTION
!
UNITDAMAGE HAZARD
Failure to follow this caution may result in equipment damag e
orimproper operation.
Unit failure as a result of operation on improperlin e voltage or
excessive phase imbalance constitutes abu se and may cause
damage toelectrical components. Suchoperation could void
any applicable Carrier warranty.
40QAC/38HDR -- 40QAQ/38QR
R