Filter
Top Products
D. Filters
Clean or replace at start of each heating and cooling season,
or more often if operating conditions require it. Replacement
filters must be same dimensions as original filters.
E. Outdoor-Air Inlet Screens
Clean screens with steam or hot water and a mild detergent.
Do not use disposable filters in place of screens.
II. LUBRICATION
A. Compressors
Each compressor is charged with the correct amount of oil at
the factory.
B. Fan Motor Bearings
Fan motor bearings are of the permanently lubricated type.
No further lubrication is required. No lubrication of condenser-
or evaporator-fan motors is required.
III. CONDENSER-FAN ADJUSTMENT (Fig. 38)
1. Shut off unit power supply.
2. Remove condenser-fan assembly (grille, motor, motor cover,
and fan).
3. Loosen fan hub setscrews.
4. Adjust fan height as shown in Fig. 38.
5. Tighten setscrews.
6. Replace condenser-fan assembly.
IV. ECONOMIZER ADJUSTMENT
Refer to Optional Economizer sections on pages 13 and 14.
V. REFRIGERANT CHARGE
Amount of refrigerant charge is listed on unit nameplate (also
refer to Table 1). Refer to GTAC2-5 Charging, Recovery, Re-
cycling, and Reclamation training manual and the following
procedures. Unit panels must be in place when unit is oper-
ating during charging procedure.
This unit uses a fixed orifice refrigerant metering device
located in the coil header. There is one orifice in each coil cir-
cuit. The size of the orifice is stamped on the outside of the
tube where the orifice is located. Orifices are factory selected
for optimum performance and are not designed to be changed
in the field. To determine if an orifice has become plugged,
disconnect power to the evaporator-fan motor and start the
unit in cooling. Observe the coil for an uneven frost pattern,
indicating a plugged orifice.
A. No Charge
Use standard evacuating techniques. After evacuating sys-
tem, weigh in the specified amount of refrigerant. (Refer to
Table 1.)
Fig. 35 — Cleaning Condenser Coil
Fig. 36 — Propping Up Top Panel
Fig. 37 — Separating Coil Sections
UNIT 581B
FAN HEIGHT
(in.)
036-060 and,
072
(208/230 V)
2.75
072
(460 and 575 V)
3.50
Fig. 38 — Condenser Fan Adjustment
—29—