Thomas & Betts UDAP - Manual (Page 27)

Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 27
4. Turn the gas control knob clockwise to "OFF".
5. Wait five (5) minutes to clear out any gas. Then smell for gas, including near
the floor. If you smell gas, STOP! and follow the steps in the WARNINGS
printed above or on the Operating Label on the heater. If you do not smell
gas, proceed to the next step.
6. Turn the gas control knob counterclockwise to "ON".
7. Close the access door.
8. Turn on the electric power to the heater.
9. Set the thermostat to the desired setting.
NOTE: If the appliance does not operate, follow the instructions "To Turn Off
Gas to Appliance" printed below (and on the Operating Label on the heater) and
call your service technician.
10. Thermostat calls for heat, energizing the venter motor.
11. Venter pressure switch closes, firing the unit.
12. Burner flame is sensed and in 30 seconds after the gas valve is energized, the
fan motor is energized.
13. If the flame is extinguished during the main burner operation, the integrated
control system closes the main valve and must be reset by interrupting
power to the control circuit. (See lighting instructions on the heater.).
TO TURN OFF GAS TO THE APPLIANCE
1) Set thermostat to lowest setting
2) If service is to be performed, turn off all electric power to the appliance.
3) Open the access door.
4) Turn the gas control knob clockwise to "OFF". Do not force.
5) Close the access door.
Gas Control
Knob
(shown in the
ON position)
Gas
Flow Gas
Flow
Top View
Side View
FIGURE 16 - Gas Valve
ON/OFF Control Knob
Check installation
after startup:
o Vent System Testing Procedure - Model UDAP
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal pitch, as required
in the National Fuel Gas Code, ANSI Z223.1 or CAN/CGA B149.1 and
B149.2, Installation Code for Gas Burning Appliances and Equipment, and
the venting installation manual. Determine that there is no blockage or
restriction, leakage, corrosion or other deficiencies that could cause an
unsafe condition.
3. In so far as practical, close all building doors and windows and all doors
between the space where the heater is and other spaces of the building. Turn
on clothes dryers and exhaust fans, such as range hoods and bathroom
exhausts, so they shall operate at maximum speed. Do not operate a sum-
mer exhaust fan. Close fireplace dampers.
4. Light the heater following the lighting instructions. Adjust the thermostat
for continued operation. Verify that combustion products are venting
properly. After determining that the heater vents properly, return doors,
windows, exhaust fans, and fireplace dampers to their previous conditions.
If improper venting is observed, the venting system must be corrected.
o With the unit in operation, measure valve outlet gas pressure. If operated at
high altitude, adjust outlet gas pressure for altitude.
See information and instructions in Paragraph 12.