Carrier 38QE - Manual (Page 5)

supplies the power for the Electric Water Heater Tank. Con­
trol and sensor wiring will also be connected to the control
box. Refer to wiring section of this manual for description of
the wiring required.
Step 5—Install Domestic Water Heating Tank Tempera­
ture Sensor Fitting.
The tank temperature sensor is used to provide the 38QE
with the tank water temperature. This temperature is used
to control and terminate the water heating mode.
The water temperature sensor fitting is installed into the
tank drain-out fitting. Details describing the piping are con­
tained within the piping section of this manual.
Step 6—Install the Thermostat(s).
The system is designed to operate with Carrier/Parker
Home-Zone® model thermostats and zoning deunpers. Refer
to the installation instructions shipped with the Carrier/
Parker Home-Zone® accessories.
Step 7—Install Indoor Fan-Coil Section (40QE024,
40QE036 or 40QEH036).
Refer to the installation instruction shipped with the 40QE
unit.
Step 8— Install Other Electrical Accessories, if any.
Refer to the individual instructions packaged with optional
accessories (humidistat, humidifier, air cleaner, zone ther­
mostats and dampers).
Also refer to the installation instructions supplied with the
40QE indoor unit.
PIPING CONNECTIONS
A system piping schematic is shown in Fig. 5 which illus­
trates both the refrigerant and domestic water heating con­
nections that are required.
Isolate interconnecting tubing from the framing and duct­
work or where tubing runs through stud spaces, enclosed
ceiling or pipe chases. Use isoiation type hangers, since
rigid fastening transmits pulsation to structure, creating
objectionable sound.
Step 9— Install Refrigerant Pipes
NOTE: Before making the 3/8" O.D. refrigerant line connec­
tions at the indoor coil verify that the fittings do not con­
tain an AccuRater piston.
The 38QE system employes a unique electronic bi­
directional expansion valve, located within the compressor
section, and does not require AccuRaters in either the
indoor or outdoor section..
Refrigerant piping between sections may be made using
accessory tubing packages or field-supplied tubing of refrig­
erant grade, correct size and condition.
If either refrigerant tubing or unit piping is exposed to
atmospheric conditions for longer than 5 minutes, it must
be evacuated to 1000 microns to eliminate contamination
and moisture in the system.
All refrigerant tubes must be insulated with closed-ceU foam
type insulation with a minimum waU thickness of 3/8". Fail­
ure to properly insulate refrigerant tubes adequately wUl
degrade system performance and efficiency, as well as per­
mitting moisture or frost to form on the tubing surfaces
during some operating modes. Insulation on the refrigerant
lines at the compatible fittings should extend over the com­
patible fitting to prevent moisture from collecting on the
fitting surface and freezing during low outdoor temperature
operation. Freezing of the moisture on the compatible fit­
ting may cause damage to the fitting and refrigerant
leakage.
Run refrigerant tubes as directly as possible, avoiding
unnecessary turns and bends. Suspend refrigerant tubes so
they do not damage insulation on liquid and vapor tubes
and do not transmit vibration to structure. Also, when pass­
ing refrigerant tubes through walls, seal opening so vibra­
tion is not transmitted to structure. Leave some slack in
refrigerant tubes between structure and units to absorb
vibration.
A CAUTION
DO NOT BURY MORE THAN 3 FT OF REFRIGER­
ANT TUBING IN GROUND. If any section of tubing
is buried, there must be a 6-in. vertical rise to valve con­
nections on outdoor unit. If more than the recom­
mended length is buried, refrigerant may migrate to the
cooler buried section during extended periods of shut­
down. This causes refrigerant slugging and possibly
compressor damage at start-up.
Compressor Section
Refrigerant piping on the 38QE differs from other Carrier
triple split type systems. The refrigerant piping requires the
installation of two (one 3/4-in. O.D. copper tube and one
3/8-in. O.D. copper tube) tubes between the compressor sec­
tion and each of the indoor and outdoor sections. A filter-
drier, specified in Table 2 or supplied with unit, must be
installed in the 3/8-in. indoor liquid fine within 12 ins. of the
compressor section for noise control. Fig. 5 illustrates the
various refrigerant tube connections on the compressor
section.
3/4-in. O.D. refrigerant vapor tube to indoor coil
3/4-in. O.D. refrigerant vapor tube to outdoor coü
3/8-in. O.D. refrigerant liquid tube to indoor coil
3/8-in. O.D. refrigerant liquid tube to outdoor coü
The total refrigerant fine distance from the indoor fan coü to
the outdoor unit shaU not exceed 50 equivalent ft (see
Fig. 6).
Both the liquid and vapor connections have compatible fit­
tings. Compatible fittings permit mechanical (quick-
connect), or sweat connections.
A. Mechanical connection (mate one set of connections at a
time.)
1. Loosen nut on compatible fitting one turn. Do not
remove.
2. Remove plug and be sure 0-ring is in groove inside
compatible fitting.
3. Cut tubing to correct length. Deburr and size as
necessary.
4. Insert tube into compatible fitting untü it bottoms.
TIGHTEN NUT UNTIL IT BOTTOMS ON SHOUL­
DER OF FITTING OR VALVE. Keep tube bottomed
in compatible fitting whüe tightening nut. Do not over­
tighten.
A CAUTION
If undersized, damaged or eUiptically-shaped tubing is
used when making Compatible Fitting, leeiks may
result.
B. Sweat connection—Use refrigerant grade tubing.
1. Remove locknut, and rubber 0-ring from inside of com­
patible fitting.
2. Cut tubing to correct length.
3. Insert tube into compatible fitting until it bottoms.