Pub. No. 11-BC08D1-7
PAGE 5
INSTALLER'S GUIDE
If a defrost control problem is suspected, refer to the service in-
formation in control box.
G. COMPrESSOr STArT-UP
After all electrical wiring is complete, SET THERMOSTAT SYS-
TEM SWITCH IN THE OFF POSITION SO COMPRESSOR WILL
NOT RUN, and apply power by closing the system main disconnect
switch. This will activate compressor sump heat (where used). Do
not change the Thermostat System Switch until power has been
applied for one (1) hour. Following this procedure will prevent
potential compressor overload trip at initial start-up.
h. OPErATIONAL AND ChECkOUT PrOCEDUrES
Final phases of this installation are the unit Operational and
Checkout Procedures which are found in this instruction on
page 8. To obtain proper performance, all units must be operated
and charge adjustments made in accordance with procedures
found in the Service Facts.
IMPOrTANT:
Perform a final unit inspection to be sure that factory tubing has
not shifted during shipment. Adjust tubing if necessary so tubes
do not rub against each other when the unit runs. Also be sure
that wiring connections are tight and wire routing is secure.
I. ELECTrIC hEATErS
Electric heaters, if used, are to be installed in the air handling
device according to the instructions accompanying the air han-
dler and the heaters.
J. OUTDOOr ThErMOSTAT
An outdoor thermostat TAYSTAT250B may be field installed.
For data, see wiring diagram attached to unit and instruction
sheet packaged with outdoor thermostat.
SYSTEM FAULTS
REFRIGERANT CIRCUIT
Head Pressure Too High
Head Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Liquid Refrig. Floodback (TXV)
Liquid Refrig. Floodback
(Cap. Tube)
I.D. Coil Frosting
Compressor Runs
Inadequate or No Cooling/Htg
ELECTRICAL
Compressor & O.D. Fan
Won’t Start
Compressor Will Not Start
But O.D. Fan Runs
O.D. Fan Won’t Start
Compressor Hums But Won’t Start
Compressor Cycles on IOL
I.D. Blower Won’t Start
DEFROST
Unit Won’t Initiate Defrost
Defrost Terminates on Time
Unit Icing Up
W
HAT
TO
C
HE
CK
M
OD
E
PO
W
ER
SU
PP
LY
HIG
H V
OLT
AG
E W
IRIN
G
CO
MP
RE
SS
OR
IO
L
RU
N C
APA
CIT
OR
STA
RT
C
APA
CIT
OR
STA
RT
R
ELA
Y
CO
NTA
CT
OR
C
ON
TAC
TS
LO
W
VO
LTA
GE
W
IRIN
G
CO
NT
RO
L T
RA
NS
FO
RM
ER
TH
ER
MO
STA
T
CO
NTA
CT
OR
C
OIL
LO
W
VO
LTA
GE
FU
SE
ST
UC
K C
OM
PR
ES
SO
R
INE
FF
ICIE
NT
C
OM
P.
RE
F. U
ND
ER
CH
AR
GE
RE
F. O
VE
RC
HA
RG
E
EX
CE
SS
IVE
EV
AP.
LO
AD
NO
NC
ON
DE
NS
AB
LE
S
RE
S.
O.D
. A
IRF
LO
W
O.D
. A
IR
RE
CIR
CU
LAT
IO
N
TX
V S
TU
CK
O
PE
N
SU
PE
RH
EAT
RE
S.
I.D
. A
IRF
LO
W
RE
F. C
IR.
RE
ST
RIC
TIO
NS
SO
V L
EA
KIN
G
SO
V C
OIL
D
EF
EC
TIV
E
CH
EC
K V
ALV
E L
EA
KIN
G
*
DE
FR
OS
T R
ELA
Y D
EF.
DE
FR
OS
T C
ON
TR
OL
D
EF.
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
P
P
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
P
P
P
P
S
S
S
S
P
P
P
P
S
S
P
P
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
S
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
P
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
P
P
S
S
S
S
S
S
S
S
S
S
S
S
P
P
P
P
P
P
S
S
S
S
S
S
S
S
S
S
S
P
P
S
S
S
S
S
S
S
S
P
P
P
P
P
P
P
S
S
P P
P
P
C - Cooling H - Heating P - Primary Causes S - Secondary Causes
*
- 3 Phase Only
TRoUbLESHooTING cHART — wHAT To cHEck
k. SEACOAST SALT ShIELD
If installed within one mile of salt water, including seacoasts and
inland waterways, models without factory supplied Seacoast Salt
Shields require the addition of BAYSEAC001 (Seacoast Kit) at
installation time. Please refer to Application Guide SS-APB007
-EN: Seacoast Applications and Seacoast Corrosion Protection
Bulletin UN-SVB11A-EN.
Notes:
1. Be sure power supply agrees with equipment nameplate.
2. Power wiring and grounding of equipment must comply with local codes.
3. Low voltage wiring to be No. 18 AWG minimum conductor.
4. ODT-B must be set lower than ODT-A.
5. If outdoor thermostats (ODT) are not used, connect W1 to W2 and W3.
6. N/A to programmable thermostat.
LEGEND
FACTORY WIRING
FIELD WIRING
TyPIcAL fIELD Hook-UP DIAGRAMS
