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Broan Replacement Fan/Limit Installation guide

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Replacement Fan/Limit – Part No. 902909
These instructions are primarily intended to assist qualified individuals experienced in the proper installation of this
appliance. Some local codes require licensed installation/service personnel for this type of equipment. Read all
instructions carefully before starting the installation. NOTE: CONTROL COMES PRE-WIRED FOR MAC FURNACE
INSTALLATION. MAKE APPROPRIATE WIRE CHANGES FOR MGH FURNACES (SEE FIGURE 2).
MAC/MGH Furnace
and
INSTALLATION SEQUENCE
MAC 1175 FURNACE
1. Remove the cover from the control box.
2. Attach the timer to the outside bottom edge of the
control box cover.
3. Remove the bushing from the bottom of the control
box.
4. Remove the fan/limit combination control.
5. Install the limit into the opening from the old fan/limit
combination control.
6. Remove the wires attached to the old fan/limit control.
Figure 1. MAC 1175 Wiring Diagram
Installation Instructions
COM
DELAY
ON
BREAK
G C R
NO NC
DELAY
ON
MAKE
WHITE
BLACK
Equipment
Ground
120V
24V
Gas Valve
WHITE
WHITE
WHITE
RED
RED
Timer
L
YELLOW
YELLOW
24V Leads to
Thermostat
YELLOW
Limit
Switch
RED
Terminal Board
BLACK
BLACK
BLACKBLACK
WHITE
Air Circulator
Receptacle
Transformer
MAC 1175
Summer Air Circulator
Receptacle
Unit Switch
-
+
7. Run the wires attached to the timer through the
bushing at the bottom of the control box and install the
bushing.
8. Connect the wires per the wiring diagram. (See
Figure 1)
9. Attach the control box cover.
10. DELAY ON MAKE dial should be set for 60 seconds.
11. DELAY ON BREAK dial should be set for 120
seconds.
St. Louis, MO
INSTALLATION SEQUENCE
MGH FURNACE
INSTALLER:
PLEASE LEAVE THESE
INSTALLATION INSTRUCTIONS
WITH THE HOMEOWNER.
Figure 2. MGH Furnace Wiring Diagram
Models MG(-) -075 and -100 Gas Atmospheric Furnaces
BLACK
BROWN
24V Leads to
Thermostat
Auxiliary
Limit Control
At Bottom Of
Heat Exchanger
Green
Ground
Screw
Control Panel Cover
123
BLOWER
RECEPTACLE
123
FAN
OFF
ON
3 Position
Switch
BLACK
WHITE
WHITE
WHITE
YELLOW
RED
BLACK
BLACK
RED
YELLOW
BLACK
BLACK
BLUE
BLUE
BLUE
BLUE
BLUE
BLACK
Control Panel Cover
120V
25V
Transformer
RED
YELLOW
RED
BLUE
BLUE
Gas Valve
BLACK
DELAY
ON
BREAK
G C
R
NO NC
DELAY
ON
MAKE
L
COM
RED
YELLOW
Limit
RED
7080520 (Replaces 707390A)
Specifications and illustrations subject to change
without notice and without incurring obligations.
Printed in U.S.A. (12/00)
¢708052§¤
708052
/