magicpak MGE4-12 Series, Инструкция по установке и обслуживанию, Страница: 16 / 22

Page 16 of 22 508197-01 Issue 2137
To Shut Down Unit
For temporary or short periods of shutdown, set the
thermostat system switch to “OFF”. For a prolonged period
of shutdown, set the thermostat system switch to “OFF”
and turn off the electrical power supply and the gas supply
to the unit.
Adjustments – Heating Section
Temperature Rise
At time of installation, the temperature rise must be
adjusted to be within the range specified on the unit rating
plate.
Checking and Adjusting Gas Input
The gas input must not exceed the figures shown on the
rating plate. The unit is equipped for rated inputs with
manifold pressures of: 3.5” w.c. for natural gas and 10.0”
w.c. for propane. The furnace requires conversion for use
with propane; the MagicPak propane conversion kit must
be used.
The manifold pressure can be measured by removing the
pipe plug in the downstream side of the gas valve and
connecting a water manometer or gauge.
Only small variations in gas input may be made by adjusting
the regulator. In no case should the final manifold
pressure vary more than 0.3” w.c. for natural gas or
0.7” w.c. for propane.
The furnace rate must be /- 2% of the appliance
rating input.
WARNING
To adjust the regulator, turn the adjusting screw on the
regulator clockwise to increase pressure and input or
counterclockwise to decrease pressure and input.
BTU/HR
Input
=
Cubic Feet per
Revolution
x 3600 x Heating
Value
# Seconds per
Revolution
For Natural Gas: Check the furnace rate by observing
the gas meter, when available, making sure all other gas
appliances are turned off. The test hand on the meter
should be timed for at least one revolution. Note the
number of seconds for one revolution.
The heating value of the gas can be obtained from the
local utility company.
For Propane Gas: The only check for the furnace rate is
to verify proper orifice spud size is installed and properly
adjust the manifold pressure using a manometer. Typical
manifold set point for installations is 10.0” W.C.
Adjustments – Cooling Section
No adjustments are required or should be attempted
regarding any of the components of the cooling system.
The system should be checked for loose or missing wiring.
Blower
The unit contains a constant torque ECM blower motor with
dedicated blower speed taps for continuous fan, cooling and
heating operation. The proper speeds have been preset at
the factory for typical heating and cooling operation. Refer
to the wiring diagram and Blower Performance table for
recommended heating/cooling speeds for specific models.
Speeds may require adjustment due to duct design and
application.
Blower Operation
Continuous operation of the air handling blower will be
obtained if the thermostat fan switch is set to “ON”. With
the thermostat fan switch set to “AUTO”, the air handling
blower will cycle corresponding with the thermostat cycling.
Fan Control
The blower will start approximately 30 seconds after the
burners ignite and will stop approximately 120 seconds
after the thermostat is satisfied. The time delay is preset at
the factory and timing cannot be adjusted.
When the thermostat system switch is set for “COOL”, the
blower will start 5 seconds after the thermostat calls for
cooling and will stop 90 seconds after the thermostat is
satisfied.
A fan switch is provided on the thermostat which will bring
the blower on for continuous operation when the switch is
set for “ON”.
Limit Control
A fixed temperature limit control is provided which will shut
off the gas to the burners if the unit is overheated for any
reason. The control must not be adjusted or relocated.
Altitude
Natural Gas LP Gas
Burner Orifices Manifold Pressure Burner Orifices LP Kit Manifold Pressure
0 - 5,500 ft.
As shipped
3.5” w.c.
ALPKT613 or 614
(model dependent)
10.0” w.c.
5,500 - 8,500 ft. 3.0” w.c. 8.0” w.c.
Above 8,500 ft. Per National Fuel Gas Code 3.5” w.c. Per National Fuel Gas Code 10.0” w.c.
Table 6.