Table of Contents
Advertisement
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
instructions before starting a split system. A split system
start-up checklist is provided at the end of these
instructions.
IMPORTANT! / IMPORTANT
TXV
SENSING
UPPER SPLIT
BULB
BLOC SUPÉRIEUR
CAPTEUR TXV
AIR FLOW
CIRCULATION
D'AIR
15 DIAMS MIN
10 DIAMS
15 x DIA. MIN
10 x DIA. MIN
LOWER
SPLIT
BLOC
TXV SENSING
INFÉRIEUR
BULB
CAPTEUR TXV
AIR FLOW
CIRCULATION
D'AIR
15 DIAMS MIN
10 DIAMS
15 x DIA. MIN
10 x DIA. MIN
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.
Fig. 19 — TXV Bulb Location Label
Adjusting TXV for Superheat
The unit-mounted thermostatic expansion valve(s) is/are
factory 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 counterclock-
wise. 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.
24
40RU500072 2.0
EQUALIZER LINE
CONDUITE D'ÉQUILIBRAGE
SIGHT GLASS
HUBLOT
TXV
SOLENOID
8 DIAMS MIN
VALVE
8 x DIA. MIN
VANNE
SOLÉNOÏDE
FILTER
DRIER
FILTRE
DESSICCATEUR
TXV
EQUALIZER LINE
CONDUITE D'ÉQUILIBRAGE
8 DIAMS MIN
8 x DIA. MIN
INDOOR COIL
ÉCHANGEUR INTÉRIEUR
Specifications subject to change without notice.
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.
Fig. 20 — TXV Adjustment Label
SERVICE
Inspection and maintenance should be performed at regular
intervals and should include the following:
•
Complete cleaning of cabinet, fan wheel, cooling coil,
condensate 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.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal in-
jury 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.
Most unit service can be performed by removing one or
both of the unit's side panels. Coil cleaning, removal or insu-
lation cleaning may require removal of a rear, top, or bottom
panel, depending on the unit's orientation. When service is
completed, 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 072-120 units are sealed, permanently lubricated bear-
ings that require no further lubrication. Sizes 150-180 units
have pillow-block bearings (see Fig. 21) that must be lubri-
cated with suitable bearing grease approximately every
3 months. See Table 15 for suitable lubricants.
Table 15 — Lubricant Data
MANUFACTURER
Mobil
Sunoco
Texaco
Texaco
*Preferred lubricant, contains rust and oxidation inhibitors.
40RU500073 2.0
LUBRICANT
Mobilplex EP No. 2
Prestige 42
Multifak 2
Regal AFB – 2*
FAS-FHS-072-180-01SI Rev. A
Advertisement
Table of Contents
