Kees DFG (DIRECT FIRED GAS) MAKE-UP AIR UNITS - Manual (Page 5)

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CONTROL SYSTEM DIAGNOSTIC INDICATOR
This component is used as a diagnostic tool for troubleshooting burner problems. It attaches to the
burner control module monitoring the function of the module and storing in memory any failures that
occur.
AUDIBLE ALARM
An alarm horn is supplied with the remote control panel. On a flame failure, the horn will sound. A reset
of the flame failure relay will silence the horn.
DISCHARGE DAMPER WITH 2-POSITION MOTOR AND INTERLOCK
A motor operated Parallel Blade Damper can be added to the discharge of the unit. This will prevent the
warm air from escaping out of the building through the unit. The damper motor spring returns the damper
to a CLOSED position during shutdown. (A discharge damper is recommended on units installed
outdoors.)
INTAKE DAMPER WITH 2-POSITION MOTOR AND INTERLOCK
A motor operated Parallel Blade Damper is installed to the fresh air intake of the unit. This keeps cold air
from entering the unit when SHUT-OFF. (An intake damper is recommended on units installed indoors.)
FILTER SECTION
The filter section with 1” cleanable or throwaway filters is supplied as standard on the units. 2" cleanable
or throwaway filters as well as Farr 30/30 throwaway filters are also available.
INTAKE HOOD WITH BIRD SCREEN
This standard accessory is sized to fit the fresh air intake of the unit. It has 1/2" mesh birdscreen on the
face of the hood and is designed to help prevent rain or snow from entering the unit. It is shipped as a
loose item for field installation. It can be deleted on indoor units that are ducted to the outside.
GALVANIZED STEEL CURB
The standard roof curb is flat, 12" high, insulated and formed of 18 gauge galvanized steel. It fits under
the fan discharge of the unit. Other heights and one way or two-way pitches are available.
SUPPORT RAIL
It supports the rear of the unit and is sized to match the roof curb. Support legs may be necessary if an
intake hood is included.
FULL PERIMETER ROOF CURB
This curb goes under the full length of the main unit (burner and blower section). A support rail is not
required for the back of the unit. However, support legs may be necessary if an intake hood is included.
MODULAR CURB CAP AND CURB
The curb cap is custom sized to house an exhaust fan as well as the supply fan on one common curb.
The exhaust fan extension is also sized to meet NFPA96 requirements for discharge height. The supply
fan extension fits under the fan discharge like the standard curb described above.
HOUSING INSULATION
1" 1-1/2# density insulation is standard on the units. It is glued and pin spotted, to the inner surface of the
walls and ceiling of the unit. As an optional cost saving, it can be deleted from the burner and filter
sections if a discharge damper is included.
VIBRATION ISOLATORS
Isolators are standard equipment underneath the blower and motor. Floor rubber in shear, floor spring
and hanger spring isolators are also available to provide additional vibration isolation for floor mounted
and indoor hanging units. They are shipped as loose items for field installation.