6
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equipment failure, it is essential that periodic maintenance be performed on this
equipment. Consult your servicing contractor or Owner’s Manual for proper frequency of maintenance. Frequency of maintenance may vary
depending upon geographic areas, such as coastal applications.
Leave Owner’s Manual with homeowner. Explain system operation and maintenance procedures outlined in manual.
24 VAC HOT
24 VAC COM
R
C
G
W/W1
Y/Y2
R
C
C
A/C
THERMOSTAT
Typical
FAN COIL
AIR
CONDITIONER
G
W2
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN
24 VAC HOT
24 VAC COM
R
C
G
W/W1
Y/Y2
R
C
C
A/C
THERMOSTAT
Typical
FURNACE
AIR
CONDITIONER
Y
G
W
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN
A002326
Fig. 6
---
Generic Wiring Diagrams
(See Thermostat Installation Instructions for wiring specific unit combinations)
R--410A REFRIGERANT QUICK REFERENCE GUIDE
S
R--410A refrigerant operates at 50--70 percent higher pressures than R--22. Be sure that servicing equipment and replacement
components are designed to operate with R--410A refrigerant.
S
R--410A refrigerant cylinders are rose colored.
S
Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
S
R--410A refrigerant systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose
when charging into suction line with compressor operating.
S
Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low--side retard.
S
Use hoses with 700 psig service pressure rating.
S
Leak detectors should be designed to detect HFC refrigerant.
S
R--410A refrigerant, as with other HFCs, is only compatible with POE oils.
S
Vacuum pumps will not remove moisture from oil.
S
Do not use liquid--line filter driers with rated working pressures less than 600 psig.
S
Do not leave R--410A refrigerant suction line filter driers in line longer than 72 hours.
S
Do not install a suction--line filter drier in liquid--line.
S
POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
S
POE oils may cause damage to certain plastics and roofing materials.
S
Wrap all filter driers and service valves with wet cloth when brazing.
S
A factory--approved liquid--line filter drier is required on every unit.
S
Do NOT use an R--22 TXV.
S
If indoor unit is equipped with an R--22 TXV, it must be changed to a hard--shutoff R--410A refrigerant TXV.
S
Never open system to atmosphere while it is under a vacuum.
S
When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter
driers. Evacuate to 500 microns prior to recharging.
S
Do not vent R--410A refrigerant into the atmosphere.
S
Do not use capillary tube coils.
S
Observe all
warnings
,
cautions
, and
bold
text.
S
All indoor coils must be installed with a hard--shutoff R--410A refrigerant TXV metering device.
Copyright 2009 Carrier Corp.
S
7310 W. Morris St.
S
Indianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: 38CKE---1SI
Replaces: New
Printed in Mexic
o
Edition Date: 06/09