5-Proper Gas Flow
Furnace should operate at least 5 minutes before check-
-
table 12. Seconds in table 12 are based on a 1 cu.ft. dial
time needed.
NOTE - To obtain accurate reading, shut o all other gas
appliances connected to meter.
TABLE 12
GAS METER CLOCKING CHART
Unit Input
Natural
1 cu ft
dial
2 cu ft
dial
1 cu ft
dial
2 cu ft
dial
55 277
111 222
33
31
21 53
15 75
35
Note: Table assumes standard temperature (60°F), pres-
sure(30in.Hg.), and fuel heating values (Btuh/Ft.3). Apply
pressure corrections in altitudes above 2000 ft.
IMPORTANT
Disconnect heating demand as soon as an accurate
reading has been obtained.
6-Heat Exchanger
Visually inspect heat exchanger. If replacement is neces-
sary refer to the instruction provided with the replacement
kit.
7-Flame Sensing
Flame current is an electrical current which passes from
the ignition control through the sensor electrode during unit
operation. The current passes from the sensor through the
-
NOTE-Electrodes are not eld adjustable. Any alterations
to the electrode may create a hazardous condition that
can cause property or personal injury.
1 - Disconnect power to unit.
2 -
sensing electrode and the sensing lead.
3 -
demand.
5 - Disconnect power to unit before disconnecting
meter. Make sure sensor wire is securely
reconnected before reconnecting power to unit.
NOTE-If the meter scale reads 0, the leads are reversed.
Disconnect power and reconnect leads for proper polarity.
B-Cooling System Service Checks
ZGB units are factory charged and require no further ad-
-
NOTE-When unit is properly charged discharge and
suction pressures should approximate those in tables 8
through 11.
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