21
8. With all safety devices closed, the system will continue
cooling operation until the thermostat is satisfied.
9. Disconnecting the jumper wire between R and Y1 and Y2
and between R and G on TB1 terminal block will simulate
a satisfied thermostat. The compressors will cycle off and
IIC (pin 12) will initiate its time delay cycle. The compressor
and the supply fan will cycle off.
10. After a time delay of approximately 3 minutes, the
compressor control circuits will be ready to respond to a
subsequent call for cooling from the wall thermostat.
11. Open disconnect switch. Reconnect the field thermostat
wire at terminal R on terminal block TB1.
Final System Checks
1. Check to see if all supply and return air grilles are adjusted
and the air distribution system is balanced for the best
compromise between heating and cooling.
2. Check for air leaks in the ductwork. See Sections on
Air
Flow Adjustments.
3. Make sure the unit is free of “rattles”, and the tubing in
the unit is free from excessive vibration. Also make sure
tubes or lines are not rubbing against each other or sheet
metal surfaces or edges. If so, correct the trouble.
4. Set the thermostat at the appropriate setting for cooling
and heating or automatic change over for normal use.
5. Be sure the Owner is instructed on the unit operation, filter,
servicing, correct thermostat operation, etc.
MAINTENANCE
HIGH VOLTAGE !
D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
OR
INSTALLING
THIS
UNIT
. M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
. F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
T
O
PREVENT
PERSONAL
INJURY
OR
DEATH
DUE
TO
IMPROPER
INSTALLATION
,
ADJUSTMENT
,
ALTERATION
,
SERVICE
OR
MAINTENANCE
,
REFER
TO
THIS
MANUAL
. F
OR
ADDITIONAL
ASSISTANCE
OR
INFORMATION
,
CONSULT
A
QUALIFIED
INSTALLER
,
SERVICE
AGENCY
OR
THE
GAS
SUPPLIER
.
WARNING
T
HIS
UNIT
MUST
BE
ISOLATED
FROM
THE
GAS
SUPPLY
PIPING
SYSTEM
BY
CLOSING
ITS
INDIVIDUAL
MANUAL
SHUTOFF
VALVE
DURING
ANY
PRESSURE
TESTING
EQUAL
TO
OR
LESS
THAN
1/2 PSIG.
CAUTION
Preventive maintenance is the best way to avoid unnecessary
expense and inconvenience. Have this system inspected at regu-
lar intervals by qualified service personnel, at least twice a year.
Routine maintenance should cover the following items:
1. Tighten all belts, set screws, and wire connections.
2. Clean evaporator and condenser coils mechanically or with
cold water, if necessary. Usually any fouling is only matted
on the entering air face of the coil and can be removed by
brushing.
3. Lubricate motor bearings.
4. Align or replace belts as needed.
5. Replace filters as needed (see below).
6. Check for blockage of condensate drain.
7. Check power and control voltages.
8. Check running amperage.
9. Check operating temperatures and pressures.
10. Check and adjust temperature and pressure controls.
11. Check and adjust damper linkages.
12. Check operation of all safety controls.
13. Examine gas furnaces (see below and the User’s Information
Manual).
14. Check condenser fans and tighten set screws.
Filters
Every application may require a different frequency of replacement
of dirty filters. Filters must be replaced at least every three (3)
months during operating seasons.
Dirty filters are the most common cause of inadequate heating
or cooling performance. Filter inspection should be made at least
every two months; more often if necessary because of local con-
ditions and usage.
Dirty throwaway filters should be discarded and replaced with a
new, clean filter.
Disposable return air filters are supplied with this unit. See the unit
Specification Sheet or Technical Manual for the correct size and
part number. To remove the filters, remove the filter access panel
on return side of the unit.
Cabinet Finish Maintenance
Use a fine grade automotive wax on the cabinet finish to maintain
the finish’s original high luster. This is especially important in in-
stallations with extended periods of direct sunlight.
Condenser and Induced Draft Motors
Bearings on the condenser fan motors and the combustion fan
motor are permanently lubricated. No additional oiling is required.
Lubrication
The fan shaft bearings and the supply fan motor have grease fittings
that should be lubricated during normal maintenance checks.
