45
Rev. 2
PRODUCT DESIGN
If “Y” from the thermostat is connected to “Y/Y2” on the air
circulation motor interface board (Thermostat Wiring Figure
C), then the following on and off sequences will occur.
100 %
50 %
Cooling
Speed
X
0
30
X
+30
Time
(sec)
Call
For
Cool
Call
Satisfied
Air Circulator Blower Operation
Cooling On Delay:
Cooling On Ramp Up:
Cooling Off Delay:
Cooling Off Ramp Down:
0 seconds
30 seconds
0 seconds
30 seconds
HEATING FAN TIMING
The heating fan timing has a fixed on sequence with an ad-
justable delay off timing. The delay timing may be adjusted
using the switches near the low voltage terminal strip (see
the following switch position figure). For heating operation
“W1” from the thermostat must be connected to “W1” on
the two-stage integrated furnace control. “W2” from the ther-
mostat must be connected to “W2” on the two-stage inte-
grated furnace control. The following on and off sequences
of the air circulating blower fan will occur:
100 %
50 %
Heating
Speed
X
0
30
60
Time
(sec)
Call
For
Heat
Call
Satisfied
X+
60
90
120
180
X+
90
120
150
210
Heating On Delay:
Heating On Ramp Up:
Heating Off Delay:
Heating Off Ramp Down:
30 seconds
30 seconds
30 seconds
Air Circulator Blower Operation
60, 90, 120, or 180
seconds (Adjustable)
CIRCULATING AIR AND FILTERS
DUCTWORK - AIR FLOW
Duct systems and register sizes must be properly designed
for the C.F.M. and external static pressure rating of the fur-
nace. Ductwork should be designed in accordance with the
recommended methods of "Air Conditioning Contractors of
America" manual D.
A duct system should be installed in accordance with Stan-
dards of the National Board of Fire Underwriters for the In-
stallation of Air Conditioning, Warm Air Heating and Venti-
lating Systems, Pamphlets No. 90A and 90B.
A return air filter is not supplied with the furnace. The in-
staller must supply a means of filtering all of the return air.
Filter(s) shall comply with UL900 or CAN/ULC-S111 Stan-
dards. If the furnace is installed with out filters, the warranty
will be voided.
The following two charts show the recommended mini-
mum filter sizes for each furnace model. Larger sizes are
also acceptable.
Furnace Model
Disposable
Permanent
GUI_045_30
1 - 20 x 25 (500)
1 - 15 x 20 (300)
GUI_070_30
1 - 20 x 25 (500)
1 - 15 x 20 (300)
GUI_070_35/40
2 - 14 x 25 (350)
1 - 16 x 25 (400)
GUI_090_30
1 - 24 x 24 (576)
1 - 16 x 25 (400)
GUI_090_50
2 - 18 x 25 (450)
1 - 20 x 25 (500)
GUI_115_40
2 - 14 x 25 (350)
1 - 18 x 25 (450)
GUI_115_50
2 - 18 x 25 (450)
1 - 20 x 25 (500)
GUI_140_50
2 - 18 x 25 (450)
1 - 20 x 25 (500)
UPFLOW/HORIZONTAL FILTER SIZE CHART
Minimum Recommended Filter Sizes
Qty. - Nominal Size Inches (Square Inch Surface Area)
Furnace Model
Filter Size
Type
GUI_045, 070
14 x 25 x 1
Permanent
GUI_090
16 x 25 x 1
Permanent
GUI_115, 140
20 x 25 x 1
Permanent
BOTTOM RETURN FILTER SIZE CHART
The sketch below shows how the filter is retained over the
bottom return air opening.
Filter Retainer
Filter
Furnace Bottom
Bottom Return Filter Retention
One inch throwaway filters should be sized for a face veloc-
ity of 300 feet per minute or less (14x25x1 throwaway = 730
CFM max. 16x25x1 throwaway = 830 CFM max. 18x25x1
throwaway = 940 CFM max. 20x25x1 throwaway = 1040
CFM max.) All other filters should be sized according to
their manufacturer's instructions.
For air delivery of less than 1800 CFM; use one side return
or bottom return.
For air delivery of 1800 CFM or higher; use two side returns
or one side return plus bottom return.
Guide dimples locate the side and bottom return cutout lo-
cations. Use a straight edge to scribe lines connecting the
dimples. Cut out the opening on these lines. An undersized
opening will cause reduced airflow. For bottom return con-
nection, remove the bottom of the cabinet before setting the
furnace on the raised platform or return air duct.
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