Carrier 49BG - Manual (Page 4)

sure the water supply to your humidifier is turned off dur­
ing the cooling season. Close the deunper located in the
bypass duct if one is installed. If your humidifier is a Model
49WS, drain and clean the water pan as described under
cleaning procedures.
PERFORMING ROUTINE MAINTENANCE
With the proper maintenance and care, your humidifier wiU
operate economically and dependably. Maintenance can be
accomplished easily by referring to the following directions.
However, before performing any maintenance, consider
these important safety precautions:
A WARNING
DISCONNECT ALL ELECTRICAL POWER TO
THE HUMIDIFIER AND FURNACE BEFORE
PERFORMING ANY SERVICE OR MAINTE­
NANCE. A FAILURE TO FOLLOW THIS WARN­
ING COULD RESULT IN PERSONAL INJURY OR
DEATH.
NOTE: THERE MAY BE MORE THAN ONE ELECTRI­
CAL DISCONNECT SWITCH.
• ALTHOUGH SPECIAL CARE HAS BEEN TAKEN
TO MINIMIZE SHARP EDGES IN THE CONSTRUC­
TION
OF YOUR HUMIDIFIER, BE EXTREMELY
CAREFUL WHEN HANDLING PARTS OR REACHING
INTO THE UNIT TO AVOID PERSONAL INJURY.
Your humidifier has been designed for easy disassembly.
This simplifies cleaning and servicing. Your unit must be
kept clean to maintain its efficiency.
Regular inspection allows you to determine the cleaning
schedule best suited to your humidifier’s operating condi­
tions. The frequency for required maintenance will depend
most upon the available water supply. In areas where hard
water and high mineral content are prevalent, a humidifier
requires cleaning and servicing more often than one sup­
plied with softer water.
At minimum, the humidifier will need to be cleaned at the
beginning of every heating season.
CLEANING PROCEDURES
Models 49BF, 49BG, and 49FH
1. Turn OFF all electrical power to the humidifier and fur­
nace. See Fig. 11.
2. Turn OFF the humidifier’s water supply. See Fig. 4.
3. Disassemble the humidifier. See Figs. 6, 7, and 8.
• If yours is a Model 49BG Humidifier, gently pull the
latch that secures the access door. Remove the door and
slide the evaporator pad assembly out of the unit. See
Fig. 8.
• To disassemble either a Model 49BF or Model 49FH
Humidifier, first remove the water supply connection to the
solenoid valve. Next, remove the screw that holds the dis­
tributor cover to the cabinet. Lift off the cover. Then, dis­
connect the drain line from the sump and loosen the thumb-
screw(s) holding the sump to the cabinet. Remove the sump.
Remove evaporator pad assembly. Again, see Fig. 6 or 7,
according to the model you own.
4. Clean the internal and external humidifier cabinet
components.
• If yours is a Model 49BG Humidifier, wash the access
door and outlet drain portion of the cabinet. Meike sure the
drain is open.
• If your humidifier is a Model 49BF or 49FH, wash the
distributor cover, sump cover, and cabinet. Be sure the inlet
ports are open and clean. Then, clean the sump with a solu­
tion of detergent and water.
5. Clean the internal components of your humidifier.
Wash the distributor pan with a mild detergent and
warm water. Be sure holes and slots in the pan are
clean and unobstructed. If the pad is covered by a
heavy deposit of scale, or if the local water supply has
high sulfate content, replace the pad with a new one.
6. Reassemble your humidifier.
7. Turn ON the electrical power and water supplies. Refer
to the Startup Procedures hsted on page 2.
Model 49WS
1. Turn OFF all electrical power to the humidifier and fur­
nace. See Fig. 11.
2. Turn OFF the humidifier’s water supply. See Fig. 4.
3. Drain water from the unit. Place a pail underneath the
drain plug located on the bottom of the humidifier cabi­
net. Lift the tab on the drain plug euid remove the plug.
AUow aU water to drain from the unit. See Fig. 15.
4. Remove the front door from the humidifier. Rotate the
latches one-half turn, then puU the door forward. See
Fig. 9.
5. Remove and inspect the evaporator pad assembly. Lift
the bearing from its retainer. See Fig. 12. Pull the
assembly away from the motor to disengage the assem­
bly shaft from the motor coupling. Rotate the evapora­
tor pad assembly 90 degrees and remove it through the
access opening. See Fig. 13.
Inspect the evaporator pad. If the pad is heavily loaded
with scale, replace the pad. To replace the pad, puU or cut
the old pad from its frame. Pull the new evaporator pad
onto the support frame until the pad is located between the
ends of the drum.
NOTE: For best performance, the evaporator pad should be
replaced before each heating season.
6. Inspect the float assembly. Remove the float arm from
the valve body by sliding out the pin and lifting off the
float arm. See Fig. 14. Inspect the rubber valve seat
located inside the float arm. If the seat appears to be
nicked or worn, invert the seat or replace it with the
spare valve seat located on the float arm. Inspect the
water opening in the valve body. If the opening is
clogged, use a pin to remove the obstruction. Remove
any accumulated deposits from the valve body and
float arm.