16
Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
7. Wiring diagram check points for diagnosis
dŚĞƚĂďůĞďĞůŽǁĂƉƉůŝĞƐƚŽďŽƚŚƚŚĞƚŚĞŝƌĞĐƚsĞŶƚ/ŶĚŽŽƌŵŽĚĞůƐĂŶĚKƵƚĚŽŽƌŵŽĚĞůƐ͘
Check-
point
Part and Description
Color of wires
Normal range
A
120V Power supply
White – Black
108 to 132 VAC
A1, A2
120V Power supply
Black - White
108 to 132 VAC
B
/ŐŶŝƚĞƌ
Purple - Purple
108 to 132 VAC
B1
Heater
Yellow - Yellow
108 to 132 VAC
C
Gas valves
>ŝŐŚƚďůƵĞͲďůƵĞĂƚKD;DsͿ
93 to 120 VDC (during
ŽƉĞƌĂƚŝŽŶͿͬϭ͘ϯϱƚŽϭ͘ϲϱŬɏ
Green - blue at COM (SV1)
93 to 120 VDC (during
ŽƉĞƌĂƚŝŽŶͿͬϭ͘ϯϱƚŽϭ͘ϲϱŬɏ
Orange - blue at COM (SV2)
93 to 120 VDC (during
ŽƉĞƌĂƚŝŽŶͿͬϭ͘ϯϱƚŽϭ͘ϲϱŬɏ
Red - blue at COM (SV3)
93 to 120 VDC (during
ŽƉĞƌĂƚŝŽŶͿͬϮ͘ϬϳƚŽϮ͘ϱϯŬɏ
C1
Hi-limit switch
Blue - Blue
>ĞƐƐƚŚĂŶϭs
and
ůĞƐƐƚŚĂŶϭ͘Ϭɏ
C2
KǀĞƌŚĞĂƚĐƵƚŽĨĨĨƵƐĞ
Blue - Blue
>ĞƐƐƚŚĂŶϭs
and
ůĞƐƐƚŚĂŶϭ͘Ϭɏ
D1, D2
ĂƐLJͲůŝŶŬĐŽŶŶĞĐƚŽƌƐ
540 (T-H3) models only
Black - White
15 VDC
;ĚƵƌŝŶŐĂƐLJͲůŝŶŬŽƉĞƌĂƚŝŽŶͿ
E1
Outlet thermistor
Black - Black
See table on p. 18
E2
/ŶůĞƚƚŚĞƌŵŝƐƚŽƌ
Black - Black
E3
,ĞĂƚĞdžĐŚĂŶŐĞƌƚŚĞƌŵŝƐƚŽƌ
540 (T-H3) models only
Black - Black
See table on p. 19