Carrier 50HJQ004 Installation, Start-Up And Service Instructions Manual page 57

3. Remove the outdoor coil corner post. (See Fig. 45.) To
hold the top panel open, place the coil corner post between
the top panel and center post. (See Fig. 46.)
4. Remove the device holding the coil sections together at
the return end of outdoor coil. Carefully separate the outer
coil section 3 to 4 in. from the inner coil section. (See Fig.
47.)
5. Use a water hose or other suitable equipment to flush
down between the 2 coil sections to remove dirt and
debris. Clean the outer surfaces with a stiff brush in the
normal manner.
6. Secure the sections together. Reposition the outer coil
section, and remove the coil corner post from between the
top panel and center post. Install the coil corner and center
posts, and replace all screws.
Fig. 47 --- Separating Coil Sections
CONDENSATE DRAIN
Check and clean each year at the start of the cooling season. In
winter, keep the drain dry or protect it against freeze-up.
FILTERS
Clean or replace at the start of each heating and cooling season, or
more often if operating conditions require it. Replacement filters
must be the same dimensions as the original filters.
OUTDOOR- -AIR INLET SCREENS
Clean the screens with steam or hot water and a mild detergent.
Do not use disposable filters in place of screens.
STEP 2 —LUBRICATION
COMPRESSOR
The compressor is charged with the correct amount of oil at the
factory.
FAN MOTOR BEARINGS
Fan motor bearings are permanently lubricated. No further
lubrication of outdoor-fan or indoor-fan motors is required.
STEP 3 —HIGH- - PRESSURE SWITCH
The high-pressure switch is mounted on a fitting containing a
Schrader core, and is located on the compressor hot gas line. This
switch opens at 428 psig and closes at 320 psig. No adjustment is
necessary.
STEP 4 —LOSS- - OF- - CHARGE SWITCH
The loss-of-charge switch is mounted on fitting containing a
Schrader core, and is located on the compressor hot gas line. This
switch opens at 7 psig and closes at 22 psig. No adjustment is
necessary.
STEP 5 —FREEZE- - STAT
The freeze-stat is a bimetal temperature-sensing switch located on
the "hair pin" end of the indoor coil. The switch protects the
indoor coil from freeze-up due to lack of airflow. The switch
opens at 30_F and closes at 45_F. No adjustment is necessary.
STEP 6 —OUTDOOR- - FAN ADJUSTMENT
1. Shut off unit power supply and tag disconnect.
2. Remove the outdoor-fan assembly (grille, motor, motor
cover, and fan) by removing the screws and flipping the
assembly onto the unit's top cover.
3. Loosen the fan hub setscrews.
4. Adjust the fan height as shown in Fig. 48.
5. Tighten the setscrews.
6. Replace the outdoor-fan assembly.
UNIT 50HJQ
004-006 AND 007 (208/230 v)
007 (460 v)
Fig. 48 --- Outdoor- -Fan Adjustment
STEP 7 —BLOWER BELT ADJUSTMENT
C06046
Inspect the blower belt for wear, proper belt tension, and pulley
alignment as conditions require, or at the beginning of each
heating and air conditioning season. Refer to Step 7 — Adjust
Indoor-Fan Speed for adjustment and alignment procedures.
STEP 8 —ECONOMI$ER IV ADJUSTMENT
Refer to the Optional EconoMi$er IV and EconoMi$er2 section.
STEP 9 —REFRIGERANT CHARGE
Amount of refrigerant charge is listed on unit nameplate (also
refer to Table 1). Refer to Carrier Refrigerant Service Techniques
Manual, Refrigerants section.
Unit panels must be in place when the unit is operating during
charging procedure. The compressor must run a minimum of 10
minutes before checking or adjusting the refrigerant charge.
NO CHARGE
Refer to Carrier Refrigerant Service Techniques. Use standard
evacuating techniques. After evacuating the system to 500
microns, weigh in the specified amount of refrigerant. (Refer to
Table 1.)
CHARGING, HEATING MODE
Do not attempt to adjust the refrigerant charge while the unit is
operating in the Heating mode. If the refrigerant charge amount is
suspect, evacuate the refrigerant system to 500 microns and
weigh in the refrigerant amount listed on the unit's data plate.
LOW CHARGE COOLING
Use Cooling Charging Charts, Fig. 49-56. Vary the refrigerant
until the conditions of the charts are met. Note that the charging
charts are different from the type normally used. Charts are based
on charging the units to the correct superheat for the various
operating conditions. An accurate pressure gauge and temperature
sensing device are required. Connect the pressure gauge to the
57
FAN HEIGHT (in.) — "A"
2.75
3.50
C06047