48
SS-SVX10H-EN
System Failure
Check the voltage between terminals 6 and 9 on J6, it
should read approximately 32 VDC. If no voltage is
present, a System failure has occurred. Refer to
in the previous section for the recommended
troubleshooting procedure.
Cooling Failure
1.
Cooling and heating set point (slide pot) on the
zone sensor has failed. Refer to the
& Digital Zone Sensor Test,” p. 49
.
2. Zone temperature thermistor ZTEMP on ZTS failed.
Refer to the
“Programmable & Digital Zone Sensor
3. CC1 or CC2 24 VAC control circuit has opened,
check CC1 & CC2 coils, and any of the controls
below that apply to the unit (HPC1, HPC2, DTL1,
DTL2).
4. LPC1 has opened during the 3 minute minimum “on
time” during 4 consecutive compressor starts,
check LPC1 or LPC2 by testing voltage between the
J1-8 & J3-2 terminals on the RTRM and ground. If
24 VAC is present, the LPCs have not tripped. If no
voltage is present, LPCs have tripped.
Simultaneous Heat and Cool Failure
W
WA
AR
RN
NIIN
NG
G
L
Liiv
ve
e E
Elle
ec
cttrriic
ca
all C
Co
om
mp
po
on
ne
en
ntts
s!!
F
Fa
aiillu
urre
e tto
o ffo
ollllo
ow
w a
allll e
elle
eccttrriicca
all ssa
affe
etty
y p
prre
ecca
au
uttiio
on
nss
w
wh
he
en
n e
ex
xp
po
osse
ed
d tto
o lliiv
ve
e e
elle
ec
cttrriic
ca
all cco
om
mp
po
on
ne
en
nttss cco
ou
ulld
d
rre
es
su
ulltt iin
n d
de
ea
atth
h o
orr s
se
erriio
ou
us
s iin
njju
urry
y..
W
Wh
he
en
n iitt iis
s n
ne
ecce
es
sssa
arry
y tto
o w
wo
orrk
k w
wiitth
h lliiv
ve
e e
elle
eccttrriicca
all
c
co
om
mp
po
on
ne
en
nttss,, h
ha
av
ve
e a
a q
qu
ua
alliiffiie
ed
d lliicce
en
nsse
ed
d e
elle
eccttrriicciia
an
n
o
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otth
he
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nd
diiv
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ua
all w
wh
ho
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ha
as
s b
be
ee
en
n p
prro
op
pe
errlly
y ttrra
aiin
ne
ed
d
iin
n h
ha
an
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ng
g lliiv
ve
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elle
eccttrriic
ca
all cco
om
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pe
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asskks
s..
•
Emergency Stop is activated.
Method 2
The second method for determining system status is
done by checking voltage readings at the RTRM (J6).
The system indication descriptions and the
approximate voltages are listed below.
System Failure
Measure the voltage between terminals J6-9 & J6-6.
•
N
No
orrm
ma
all O
Op
pe
erra
attiio
on
n = approximately 32 VDC
•
S
Sy
ysstte
em
m F
Fa
aiillu
urre
e = less than 1 VDC, approximately
0.75 VDC
•
T
Te
esstt M
Mo
od
de
e = voltage alternates between 32 VDC &
0.75 VDC
Heat Failure
Measure the voltage between terminals J6-7 & J6-6.
•
H
He
ea
att O
Op
pe
erra
attiin
ng
g = approximately 32 VDC
•
H
He
ea
att O
Offff = less than 1 VDC, approximately 0.75 VDC
•
H
He
ea
attiin
ng
g F
Fa
aiillu
urre
e = voltage alternates between 32
VDC & 0.75 VDC
Cool Failure
Measure the voltage between terminals J6-8 & J6-6.
•
C
Co
oo
oll O
Op
pe
erra
attiin
ng
g = approximately 32 VDC
•
C
Co
oo
oll O
Offff = less than 1 VDC, approximately 0.75 VDC
•
C
Co
oo
olliin
ng
g F
Fa
aiillu
urre
e = voltage alternates between 32
VDC & 0.75 VDC
To use LED’s for quick status information at the unit,
purchase a BAYSENS010B ZSM and connect wires with
alligator clamps to terminals 6 through 10. Connected
each respective terminal wire (6 through 10) from the
Zone Sensor to the unit J6 terminals 6 through 10.
N
No
otte
e:: If the system is equipped with a programmable
zone sensor, (BAYSENS119A, or BAYSENS023A),
the LED indicators will not function while the
BAYSENS010A is connected.
Temperature Tests
N
No
otte
e:: These procedures are not for programmable or
digital models and are conducted with the Zone
Sensor Module electrically removed from the
system.
Test 1 - Zone Temperature Thermistor
(ZTEMP)
This component can be tested by measuring the
resistance between terminals 1 and 2 on the Zone
Temperature Sensor. See
for typical
indoor temperatures, and corresponding resistive
values.
Table 11.
Typical indoor temperatures and values
Zone Temperature
Nominal Resistance
50°F or 10.0°C
19.9 Kohms
55°F or 12.8°C
17.47 Kohms
60°F or 15.6°C
15.3 Kohms
65°F or 18.3°C
13.49 Kohms
70°F or 21.1°C
11.9 Kohms
75°F or 23.9°C
10.50 Kohms
80°F or 26.7°C
9.3 Kohms
85°F or 29.4°C
8.25 Kohms
90°F or 32.2°C
7.3 Kohms
Test 2 - Cooling Set Point (CSP) and
Heating Set Point (HSP)
C
Co
oo
oll S
SP
P = Terminals 2 and 3
