16.Combustion Air Proving
Switch (cont’d)
Pressure Switch Settings
The two Tables on the left below list the approximate water column negative pres- sure readings and switch setpoints for sea level operating conditions for Model UDAP and Model
DANGER: Safe operation of this unit requires proper venting flow. NEVER bypass combustion air proving switch or attempt to operate the unit without the venter running and the proper flow in the vent system. Hazardous conditions could result. See Hazard Levels, page 2.
Model | Startup | Equilibrium | Setpoint | Setpoint | Label | Switch | |
Cold | Hot | OFF | ON | ||||
UDAP | Color | P/N | |||||
Negative Pressure Measured in " w.c. | |||||||
|
|
| |||||
30 | 1.00 | 0.78 | 0.40 | 0.58 | Green | 197030 | |
45 | 0.95 | 0.75 | 0.40 | 0.58 | Green | 197030 | |
60 | 1.00 | 0.78 | 0.50 | 0.68 | Orange | 196388 | |
75 | 1.00 | 0.85 | 0.50 | 0.68 | Orange | 196388 | |
100 | 0.85 | 0.72 | 0.50 | 0.68 | Orange | 196388 | |
125 | 0.75 | 0.60 | 0.40 | 0.58 | Green | 197030 | |
150, 175 | 0.75 | 0.65 | 0.40 | 0.58 | Green | 197030 | |
200, 225 | 2.20 | 1.50 | 1.10 | 1.30 | Blue | 201158 | |
250, 300 | 2.30 | 1.60 | 1.10 | 1.30 | Blue | 201158 | |
350, 400 | 2.60 | 1.80 | 1.40 | 1.60 | Red | 201159 |
Model | Startup | Equilibrium | Setpoint | Setpoint | Label | Switch | |
UDAS | Cold | Hot | OFF | ON | Color | P/N | |
Differential Pressure Measured in " w.c. | |||||||
|
|
| |||||
30 | 1.00 | 0.78 | 0.65 | 0.83 | Yellow | 197028 | |
45 | 1.05 | 0.80 | 0.65 | 0.83 | Yellow | 197028 | |
60 | 1.10 | 0.85 | 0.65 | 0.83 | Yellow | 197028 | |
75 | 1.10 | 0.85 | 0.65 | 0.83 | Yellow | 197028 | |
100 | 0.85 | 0.72 | 0.55 | 0.73 | White | 196362 | |
125 | 0.75 | 0.60 | 0.45 | 0.63 | Pink | 197032 | |
150, 175 | 0.75 | 0.60 | 0.40 | 0.58 | Green | 197030 | |
200, 225 | 2.20 | 1.50 | 1.10 | 1.30 | Blue | 201158 | |
250, 300 | 2.30 | 1.60 | 1.10 | 1.30 | Blue | 201158 | |
350, 400 | 2.60 | 1.80 | 1.40 | 1.60 | Red | 201159 |
Model | Startup | Equilibrium | Setpoint | Setpoint | Label | Switch | |
Cold | Hot | OFF | ON | ||||
with Opt AV6 | Color | P/N | |||||
Negative Pressure Measured in " w.c. | |||||||
|
|
| |||||
30 | 1.10 | 0.84 | 0.65 | 0.83 | Yellow | 197028 | |
45 | 1.10 | 0.81 | 0.50 | 0.68 | Orange | 196388 | |
60 | 0.92 | 0.75 | 0.60 | 0.78 | Lt Blue | 197029 | |
75 | 0.97 | 0.78 | 0.60 | 0.78 | Lt Blue | 197029 | |
100 | 0.88 | 0.71 | 0.55 | 0.73 | White | 196362 |
17. Limit Control | All units are equipped with a temperature activated auto reset limit control. The |
| control is factory set and is |
| control will interrupt the electric supply to the gas valve. This safety device pro- |
| vides protection in the case of motor failure or lack of airflow due to a restriction at |
| the inlet or outlet. (For location, see FIGURE 18, page 31.) |
18.Flame Rollout Switch - Sizes 30-125 only
CAUTION: The auto reset limit control will continue to shut down the heater until the cause is corrected. Never bypass the limit control; hazardous conditions could result. See Hazard Intensity Levels, page 2.
Sizes
DANGER: If the manual reset flame rollout switch activates, identify and correct the cause before resetting the switch. Never bypass the flame rollout switch; hazardous conditions could result. See Hazard Intensity Levels, page 2.
Form