24
START-UP
Before starting unit, check the following and correct as
necessary:
• Is unit solidly supported?
• Is fan adjusted for speed and pulley alignment?
• Are pulleys, motor, and bearings securely mounted?
• Are there any loose parts that will rattle or vibrate?
• Is condensate drain pan pitched for correct drainage?
• Are coil baffle plates tight against coil to prevent air
bypass?
• Are all panels securely fastened?
• Are all electrical connections correct and tight?
• Is TXV bulb located on suction tube per Fig. 19?
• Is the capillary tube to the bulb free of kinks and not
subject to pinching?
• Is the bulb well secured to the suction tube with strap?
Also refer to condensing unit or outdoor heat pump section in
-
structions before starting a split system. A split system start-up
checklist is provided at the end of these instructions.
Fig. 19 — TXV Bulb Location Label
Adjusting TXV for Superheat
The unit-mounted thermostatic expansion valve(s) is/are facto
-
ry set to provided superheat at the bulb location in 10°F to
15°F (5.5°C to 8.3°C) range. Actual system load conditions
may require adjustment of the factory setting. (See Fig. 20.)
To adjust the TXV superheat setting:
1. Remove the seal cap from the bottom of the TXV body.
2. To increase superheat, turn the stem clockwise. To decrease
the superheat, turn the stem counterclockwise. Do not turn the
stem more than one full turn.
3. Wait until suction pressure and superheat stabilize. This may
take more than 30 minutes.
4. Continue adjustment until superheat reaches 10°F to 15°F
(5.5°C to 8.3°C).
5. Replace the seal cap; tighten.
Fig. 20 — TXV Adjustment Label
SERVICE
Inspection and maintenance should be performed at regular in
-
tervals and should include the following:
• Complete cleaning of cabinet, fan wheel, cooling coil, con
-
densate pan and drain, heating coils, and return-air grille
(if present).
• Inspection of panels and sealing of unit against air leakage.
• Adjustment of fan motor, belt, bearings, and wheels.
• Cleaning or replacement of filters.
• Testing for cooling/heating system leaks.
• Checking of all electrical connections.
Most unit service can be performed by removing one or both of
the unit’s side panels. Coil cleaning, removal or insulation
cleaning may require removal of a rear, top, or bottom panel,
depending on the unit’s orientation. When service is complet
-
ed, replace unit panels.
Panels
Panels are fastened to unit frame with sheet metal screws. Fan
and coil compartment must be sealed tightly after service to
prevent air from bypassing the cooling coil.
Fan Motor Lubrication
Fan motor supplied with unit is permanently lubricated and
requires no further lubrication.
Fan Shaft Bearings
Size 07A-12A units are sealed, permanently lubricated bear
-
ings that require no further lubrication. Sizes 14A-16A units
have pillow-block bearings (see Fig. 21)
that must be lubricat
-
ed with suitable bearing grease approximately every 3 months.
See Table 15 for suitable lubricants.
*Preferred lubricant, contains rust and oxidation inhibitors.
IMPORTANT! / IMPORTANT
40RU500072 2.0
The sensor bulb capillary tubes must be routed from the TXVs inside the unit through one of the piping
access holes. Clamp the TXV sensor bulb on a vertical portion of the suction line, outside the unit.
Super heat must be adjusted in field.
Les tubes capillaires du capteur doivent être acheminé à partir du détendeur thermostatique situé à l'intérieur
de l'appareil au travers de l'un des trous d'accès de conduites. Attacher le capteur sur une portion verticale
de la conduite de succion, à l'extérieur de l'appareil. La surchauffe doit être ajustée sur place.
AIR FLOW
CIRCULATION
D'AIR
UPPER SPLIT
BLOC SUPÉRIEUR
LOWER
SPLIT
BLOC
INFÉRIEUR
AIR FLOW
CIRCULATION
D'AIR
15 DIAMS MIN
15 x DIA. MIN
10 DIAMS
10 x DIA. MIN
TXV SENSING
BULB
CAPTEUR TXV
15 DIAMS MIN
15 x DIA. MIN
10 DIAMS
10 x DIA. MIN
TXV
SENSING
BULB
CAPTEUR TXV
EQUALIZER LINE
CONDUITE D'ÉQUILIBRAGE
SIGHT GLASS
HUBLOT
8 DIAMS MIN
8 x DIA. MIN
TXV
SOLENOID
VALVE
VANNE
SOLÉNOÏDE
FILTER
DRIER
FILTRE
DESSICCATEUR
TXV
EQUALIZER LINE
CONDUITE D'ÉQUILIBRAGE
8 DIAMS MIN
8 x DIA. MIN
INDOOR COIL
ÉCHANGEUR INTÉRIEUR
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal inju
-
ry or death.
Before performing service or maintenance operations on
unit, always turn off main power switch to unit and install
lockout tag. Unit may have more than one power switch.
Table 15 — Lubricant Data
MANUFACTURER
LUBRICANT
Mobil
Mobilplex EP No. 2
Sunoco
Prestige 42
Texaco
Multifak 2
Texaco
Regal AFB – 2*
INSTALLER / INSTALLATEUR
TXV superheat must be checked at initial
unit start-up and adjusted if necessary.
Superheat must be 10 - 15 deg F.
La surchauffe TXV doit être vérifiée au
moment de la mise en route initiale et
ajustée si nécessaire. La surchauffe doit
être comprise entre 10 et 15 degrés F.
40RU500073 2.0
