Carrier 50ZH Instruction Manual download pdf (Page 16)

The ability to properly perform maintenance on this equip-

ment requires certain expertise, mechanical skills, tools and

equipment. If you do not possess these, do not attempt to

perform any maintenance on this equipment, other than those

procedures recommended in the User’s Manual. FAILURE

TO HEED THIS WARNING COULD RESULT IN SERI-

OUS INJURY, DEATH OR DAMAGE TO THIS EQUIP-

MENT.

The minimum maintenance requirements for this equipment are as

follows:

1. Inspect air filter(s) each month. Clean or replace when

necessary.

2. Inspect indoor coil, outdoor coil, drain pan, and condensate

drain each cooling and heating season for cleanliness. Clean

when necessary.

3. Inspect blower motor and wheel for cleanliness each cooling

and heating season. Clean when necessary. For first heating

season, inspect blower wheel bimonthly to determine proper

cleaning frequency.

4. Check electrical connections for tightness and controls for

proper operation each cooling season. Service when neces-

sary.

5. Check the drain channel in the top cover periodically for

blockage (leaves, insects). Clean as needed.

Failure to follow these warnings could result in serious injury

or death:

1. Turn off electrical power to the unit and install lockout tag

before performing any maintenance or service on the unit.

2. Use extreme caution when removing panels and parts. As

with any mechanical equipment, personal injury can result

from sharp edges, etc.

3. Never place anything combustible either on, or in contact

with, the unit.

Step 1—Air Filter

NOTE: Never operate the unit without a suitable air filter in the

return-air duct system. Always replace the filter with the same size

as originally installed. See Table 1 for recommended filter sizes

Inspect air filter(s) at least once each month and replace

(throwaway-type) or clean (cleanable-type) at least twice during

each cooling season or whenever the filters become clogged with

dust and lint.

Replace filters with the same dimensional size and type as

originally provided, when necessary.

Step 2—Unit Top Removal (Outdoor-Coil Side)

NOTE: When performing maintenance or service procedures that

require removal of the unit top, be sure to perform all of the routine

maintenance procedures that require top removal, including coil

inspection and cleaning, and condensate drain pan inspection and

cleaning.

Disconnect and tag electrical power to the unit before

removing top. Failure to adhere to this warning could cause

serious injury or death.

Only qualified service personnel should perform maintenance and

service procedures that require unit top removal.

Refer to the following top removal procedures:

1. Remove 7 screws on unit top cover surface. (Save all screws.)

2. Remove 2 screws on unit top cover flange. (Save all screws.)

3. Lift top from unit carefully. Set top on edge and make sure

that top is supported by unit side that is opposite duct (or

plenum) side.

4. Carefully replace and secure unit top to unit, using screws

removed in steps 1 and 2 above, when maintenance and/or

service procedures are completed.

Step 3—Indoor Blower and Motor

For longer life, operating economy, and continuing efficiency,

clean accumulated dirt and grease from the blower wheel and

motor annually.

Disconnect and tag electrical power to the unit before

cleaning the blower wheel. Failure to adhere to this warning

could cause serious injury or death.

To clean the blower wheel:

1. Access the blower assembly as follows:

a. Remove top access panel.

b. Remove 3 screws that hold blower orifice ring to blower

housing. Save screws.

c. Loosen setscrew(s) which secure wheel to motor shaft.

2. Remove and clean blower wheel as follows:

758 110

683 100

621 90

552 80

483 70

414 60

345 50

276 40

207 30

30 40 50 60 70 80 90

-1 4 1016212732

SUCTION LINE TEMPERATURE (

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

OUTDOOR TEMP

115 46

105 41

95 35

85 29

75 24

65 18

55 13

45 7

C00163

Fig. 18—Cooling Charging Chart—50ZH030

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22 23 24

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Carrier 50ZH Instruction Manual Page 16

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