8 - Honeywell VR8205 Gas Valve with ON/OFF Switch
-Move gas valve switch to ON. See figure 27. Honeywell VR8205 Gas Valve with Control Knob - Turn knob on gas valve counterclockwise _ to ON, Do not force. See figure 28,
White Rodgers 36G Gas Valve - Move gas valve switch to ON, See figure 29,
9 - Replace the upper access panel,
10- Turn on all electrical power to to the unit, 11- Set the thermostat 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 - Honeywell VR8205 Gas Valve with ON/OFF Switch
-Move gas valve switch to OFF, See figure 27. Honeywell VR8205 Gas Valve with Control Knob -
Turn knob on gas valve clockwise clio to OFF, Do not force, See figure 28,
White Rodgers 36G Gas Valve - Move gas valve switch to OFF, See figure 29,
5 - Replace the upper access panel. Heating Sequence Of Operation
1 - When thermostat calls for heat, combustion air inducer starts,
2 - Combustion air pressure switch proves combustion air inducer operation. Switch is factory set and requires no adjustment,
3 - After a 15 second prepurge, the hot surface ignitor en- ergizes,
4- After a 20 second ignitor
5 - Gas is ignited, flame sensor proves the flame, and the combustion process continues,
6 - If flame is not detected after first ignition trial, the igni- tion control will repeat steps 3 and 4 four more times before locking out the gas valve ("WATCHGUARD" flame failure mode), The ignition control will then auto- matically repeat steps 3, 4, 5, and 6 after 60 minutes,
7- To interrupt the
"Heat", Heating sequence then restarts at step 1.
Gas Flow (Approximate)
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, A portable LP gas me-
ter (17Y44) is available for LP applications,
2 - Compare the number of seconds and the gas meter size in table 10 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, |
|
|
| TABLE 10 |
|
| Gas Flow Rate (Ft.'_/Hr.) | ||
Seconds | for 1 | Gas | Meter Size |
Revolution | 1/2 cu ft Dial | 1 cu ft Dial | |
10 |
| 180 | 360 |
12 |
| 150 | 300 |
14 |
| 129 | 257 |
16 |
| 113 | 225 |
18 |
| 100 | 200 |
2O |
| 90 | 180 |
22 |
| 82 | 164 |
24 |
| 75 | 150 |
26 |
| 69 | 138 |
28 |
| 64 | 129 |
3O |
| 60 | 120 |
32 |
| 56 | 113 |
34 |
| 53 | 106 |
36 |
| 50 | 100 |
38 |
| 47 | 95 |
4O |
| 45 | 90 |
42 |
| 43 | 86 |
44 |
| 41 | 82 |
46 |
| 39 | 78 |
48 |
| 38 | 75 |
5O |
| 36 | 72 |
52 |
| 35 | 69 |
54 |
| 33 | 67 |
56 |
| 32 | 64 |
58 |
| 31 | 62 |
6O |
| 30 | 60 |
Gas Pressure
1 - Check the gas line pressure with the unit firing at maxi- mum rate. A minimum of 4.5 in, w.c. for natural gas or 11,0 in, w,c, for LP/propane gas should be maintained, 2- After the line pressure has been checked and ad- justed, check the manifold pressure. A natural gas to LP/propane gas changeover kit is required to convert the unit, Manifold pressure for all units fueled by natu-
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