Table of Contents
Advertisement
9 - Replace t heupper accesspanel,
10- Turnonallelectrical power tototheunit,
11- Setthethermostat to desired setting,
NOTE - When unit is initially started, steps 1 through 11
may need to be repeated to purge air from gas line.
12- If the appliance will not operate, follow the instructions
"Turning Off Gas to Unit" and call your service techni-
cian or gas supplier.
Turning
Off Gas to Unit
1 - Set the thermostat to the lowest setting,
2 - Turn off all electrical power to the unit if service is to be
performed.
3 - Remove the upper access panel.
4 - Move the gas valve switch to the OFF position.
5 - Replace the upper access panel,
Gas Flow (Approximate)
TABLE 32
Gas Flow Rate (Ft._/Hr.)
Seconds
for 1
Revolution
10
12
14
16
18
2O
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
Gas Meter Size
1/2 cu ft Dial
1 cu ft Dial
180
360
150
300
129
257
113
225
100
200
90
180
82
164
75
150
69
138
64
129
60
120
56
113
53
106
50
100
47
95
45
90
43
86
41
82
39
78
38
75
36
72
35
69
33
67
32
64
31
62
30
60
1 - Operate unit at least 15 minutes before checking gas
flow. Determine the time in seconds for one revolu-
tions of gas through the meter,
2 - Compare the number of seconds and the gas meter
size in table 32 to determine the gas flow rate. Multiply
the gas flow rate by the heating value to determine the
unit input rate, If manifold pressure is correct and the
unit input rate is incorrect, check gas orifices for proper
size and restriction,
3 - Remove temporary gas meter if installed,
NOTE - To obtain accurate reading, shut off all other gas
appliances connected to meter.
Manifold Pressure Measurement
To correctly measure manifold pressure, the differential
pressure between the positive gas manifold and the nega-
tive burner box must be considered,
Use pressure test
adapter kit (available as Lennox part 10L34) to assist in
measurement.
1 - Connect test gauge "+" connection to manifold pres-
sure tap on gas valve,
2 - Tee into the gas valve regulator vent hose and con-
nect test gauge "-" connection,
3 - Start unit on low heat (40% rate) and allow 5 minutes
for unit to reach steady state,
4 - While waiting for the unit to stabilize, notice the flame.
Flame should be stable and should not lift from burner,
Natural gas should burn blue,
5- After allowing unit to stabilize for 5 minutes, record
manifold pressure and compare to value given in table
33.
6 - Repeat steps 3, 4 and 5 on high heat,
NOTE- Shut unit off and remove manometer as soon as an
accurate reading has been obtained. Take care to replace
oressure tap plug.
A, CAUTION
Page 52
Hide quick links:
Advertisement
Table of Contents
