Lochinvar Efficiency-Pac EW 150 -- 300, Инструкция по установке и обслуживанию

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3
Gas connections
(continued)
Installation & Service Manual
APPLY WRENCH FROM TOP
OR BOTTOM OF CONTROL
Figure 3-2 Wrench to Support Gas Valve for Piping
Connection
7. Remove seal over control inlet.
8. Connect pipe to control inlet. Use wrench to square
ends of the control.
9. For LP gas, consult your LP gas supplier for expert
installation.
10. Ensure that all air is properly bled from the gas line
before starting the ignition sequence. Start-up without
properly bleeding air from the gas line may require
multiple reset functions of the ignition control module
to achieve proper ignition.
4
3
2
0
1
2
3
1
4
MANOMETER
GAS VALVE
Figure 3-3 Manometer Connection for Manifold
Pressure Adjustments
Gas Manifold Pressure Adjustments
IMPORTANT
The gas valve is referenced to the fan
pressurized chamber by a hose connected
from the vent of the gas valve regulator
to the chamber pressure tap located on
the left side of the jacket. Reference the
drawings in this section for component
location and connection points for
pressure measurement. The referenced
chamber pressure must be subtracted
from the manifold pressure to obtain
actual net manifold pressure for normal
operation. A manometer or magnahelic
gauge legible in 0.1" increments up to
10" water column is required to check
and adjust the manifold pressure. The
regulator cover screw on the gas valve
must be in place and tight for the
appliance to operate properly.
1. Turn the power switch to the “OFF” position.
2. Remove the top front jacket panel.
3. Locate the air pressure switch located to the right of the
combustion air fan. Trace the hose from the air pressure
switch to the barb located in the top of the upper
chamber. Remove the hose from this barb and connect
the hose from the manometer or magnahelic to this barb
to measure the air pressure in the front chamber.
4. Turn the power switch to the “ON” position.
5. Set the thermostat to call for heat. The fan will start.
6. While the combustion air fan is running for the prepurge
cycle and the pressure in the front chamber stabilizes,
record the pressure in the front chamber. This pressure
will be used to calculate the net manifold pressure.
7. Turn the power switch to the “OFF” position.
8. Remove the manometer or magnahelic hose from the
front chamber barb and reinstall the hose from the air
pressure switch to the barb.
9. Turn all gas valve knobs and the manual gas cock to the
“OFF” position.