62
The following steps and diagram
indicate the locations of the
connection points required
to check the differential air
pressure.
The differential air pressure
switch is a safety device which
will prevent the boiler from
firing if there is an air intake,
boiler heat exchanger or vent
blockage.
Turn off service switch, or lower
thermostat setting.
Remove vinyl caps from Tee and
4-way connector.
Install testing lines as shown
t o i n c l i n e d m a n o m e t e r o r
differential pressure gauge with
the ability to read 0.01” to 2.0”
w.c.
Turn on service switch and set
thermostat to call for heat.
Boiler statUs
DiFFereNtial PressUre (w.c.)
PressUre switcH coNNects
Not Running
0”
Normally Open
Setpoint
1.00” for Model-100
1.35” for Model-75
1.55” for Model-50
Running Without Blockage
Greater Than Setpoints
Closed
Running With Blockage
Less Than or Equal to Setpoints
Open
If manometer readings do not correspond to the chart above, check for possible causes:
- Blockage or moisture in suction lines
- Blockage in air intake or vent pipes
- Undersized air intake or vent pipes
- Loose blower wheel or motor shaft
- Inncorect pressure switch or pressure switch setpoint
When pressure reading is proper and the pressure switch is operating properly, remove testing
lines and reinstall vinyl caps to Tee and 4-way connector.
What Is System Status?
DIFFERENTIAL AIR PRESSURE SWITCH CHECK
Содержание UB100
Страница 15: ...15 Near Boiler Piping Figure 2 Single Zone Boiler Piping ...
Страница 16: ...16 Figure 3 Multi zone Boiler Piping With Zone Valves Near Boiler Piping ...
Страница 19: ...19 Figure 6 Diaphragm Type Expansion Tank Piping Near Boiler Piping ...
Страница 20: ...20 Figure 7 Conventional closed type Expansion Tank Piping Near Boiler Piping ...
Страница 27: ...27 Combustion Air and Vent Pipe Figure 11 Combustion Air and Vent Piping ...
Страница 32: ...32 Electrical Wiring Figure 13 Field Wiring Connections ...
Страница 53: ...53 DETAILED SEQUENCE OF OPERATION ...
Страница 57: ...57 TROUBLESHOOTING CHART 2 TROUBLESHOOTING ...
Страница 58: ...58 TROUBLESHOOTING CHART 3 TROUBLESHOOTING ...
Страница 60: ...60 TROUBLESHOOTING CHART 5 TROUBLESHOOTING ...
Страница 63: ...REPAIR PARTS Model No UB90 50 UB90 75 UB90 100 UB90 50 100 GAS FIRED DIRECT VENT CONDENSING HOT WATER Boiler ...
Страница 64: ...64 20 3 5 TYP OF 4 6 11 8 9 10 13 15 16 2 12 1 21 17 18 18 4 19 7 A Jacket and Base Assembly Repair Parts ...
Страница 72: ...P O Box 4729 Utica NY 13504 4729 ...