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035-17480-000 Rev. A (800)

8

Unitary Products Group

5.

Position the filter between the wire retainer and the cabi-
net wall (or floor) so it completely covers the cabinet air
opening and secure the filter in place at the front of the
cabinet by fastening the closed (looped) end of the
retainer wire under the flanged edge of the cabinet.
When properly installed the filter should fit flush with all
four sides of the cabinet wall.

NOTE: Air velocity through throw-away type filters may not
exceed 300 feet per minute. All velocities over this require the
use of high velocity filters.

Side Return - External Filter

Locate and knock out the square corner locators. These indi-
cate the size of the cutout to be made in the furnace side
panel. Refer to Figure 4.

Install the side filter rack following the instructions provided
with that accessory. If a filter(s) is provided at another loca-
tion in the return air system, the ductwork may be directly
attached to the furnace side panel.

NOTE. Some accessories such as electronic air cleaners and
pleated media may require a larger side opening. Follow the
instructions supplied with that accessory for side opening
requirements.

The return duct may be attached to the furnace by S-cleat,
bend tabs or other approved methods. Be sure to seal the
duct to the furnace to prevent air leakage.

Where the return duct system is not complete, the return con-
nection must run full size to a location outside the utility room
or basement. For further details, consult Section 5.3 (Air for
Combustion and Ventilation) of the National Fuel Gas Code,
ANSI Z223.1, or CAN/CGA B149.1 or.2, Installation Code -
latest editions.

Bottom Return

Bottom return applications normally pull return air through a
base platform or return air plenum. Be sure the return plat-
form structure is suitable to support the weight of the furnace.
Refer to Figure 2 on page 7, for unit dimensions and Table 1
for unit weights. Be sure to seal the furnace to plenum con-
nection to prevent air leakage.

The bottom panel is equipped with a perforated opening for
easy removal. Tabs must be cut with sheet metal snips to
allow removing knock-out. Scribe marks are included for
forming flanges for attachment of the return air ductwork.

NOTE: If an external mounted filter rack is being used, see
the instructions provided with that accessory for proper hole
cut size.

Upflow attic installations must meet all minimum clearances
to combustibles and have floor support with required service
accessibility.

GAS PIPING

The gas supply should be a separate line and must be
installed in accordance with the National Fuel Gas Code,
ANSI Z223.1 (latest edition), or the CAN/CGA B149.1 or .2
Installation Codes (latest edition) and all applicable local and
utility requirements.

FIGURE 3 :

Filter Retainer Placement

FIGURE 4 :

Side Return Cutout Markings

RIGHT SIDE

INSTALLATION

SHOWN

CLIPS

FILTER

(PROVIDED

POSITION WIRE RETAINER

(PROVIDED) UNDER FLANGE

FURNACE

FRONT

F R O N T   O F

F U R N A C E

C O R N E R

M A R K I N G S

All installations must have a filter installed.

Summary of Contents for P*XU/G9D-UP

Page 1: ...TART UP AND ADJUSTMENTS 20 ACCESSORY CONNECTIONS 24 FURNACE ACCESSORIES 25 FILTER PERFORMANCE 26 OPERATION AND MAINTENANCE 26 TROUBLESHOOTING 30 FURNACE CONTROL DIAGNOSTICS 30 WIRING DIAGRAM UPFLOW MO...

Page 2: ...THREE TWO PIPE SYSTEM USING COMBUSTION AIR FROM A VENTILATED ATTIC SPACE 18 HORIZONTAL VENT APPLICATIONS 18 CONDENSATE PIPING 19 SAFETY CONTROLS 19 START UP AND ADJUSTMENTS 20 IGNITION SYSTEM SEQUENCE...

Page 3: ...ransit There are no shipping or spacer brackets which need to be removed NOTES CAUTIONS WARNINGS The installer should pay particular attention to the words NOTE CAUTION and WARNING NOTES are intended...

Page 4: ...size as determined using the appropriate tables in Appendix G of the above codes SPECIFIC UNIT INFORMATION LIMITATIONS LOCATION This furnace should be installed in accordance with all national and lo...

Page 5: ...leaning Eighteen 18 inches at the side where access is required for passage to the front when servicing or for inspection or replacement of flue vent connections 8 Where it will not interfere with the...

Page 6: ...ust comply with the National Electrical Code NFPA 70 latest edition For altitudes above 2 000 ft reduce capacity 4 for each 1 000 ft above sea level Refer to Form 650 78 N1 1V Wire size based on coppe...

Page 7: ...ls NOTE In order to achieve the airflow indicated in the table it is recommended those applications over 1800 CFM use return air from two sides one side and the bottom or bottom only For single return...

Page 8: ...cation outside the utility room or basement For further details consult Section 5 3 Air for Combustion and Ventilation of the National Fuel Gas Code ANSI Z223 1 or CAN CGA B149 1 or 2 Installation Cod...

Page 9: ...for 63 F 35 C rise wire when installed in accordance with instructions Refer the rating plate or Physi cal and Rating Data Tables in these instructions for specific furnace electrical data Provide a p...

Page 10: ...mostat to the terminal board on the ignition module Connect Class 2 control wiring for single stage thermostat or for two stage thermostat Refer to Figure 7 for single stage and Fig ure 8 for two sta...

Page 11: ...e observed Long radius elbows are required for all units 1 Long radius elbows are required for all units 2 Elbows are assumed to be 90 degrees Two 45 degree elbows count as one 90 degree elbow 3 Elbow...

Page 12: ...e grade and anticipated snow depth 1 ft Above grade when adjacent to public walkway 7 ft From electric gas meters regulators and relief equipment min horizontal distance 4 ft Does not apply to multipl...

Page 13: ...ional Clearance FIGURE 12 Horizontal Termination Configuration With Horizontal Extension VENT OVERHANG COMBUSTION AIR ELBOW PARALLEL TO WALL 12 SEPARATION BETWEEN BOTTOM OF COMBUSTION AIR AND BOTTOM O...

Page 14: ...fined space is an area with less than 50 cubic feet per 1000 Btu hr input rating for all appliances installed in that area The following must be considered to obtain proper air for combustion and vent...

Page 15: ...all be permitted to be waived where special engineering approved by the authority having jurisdiction provides an adequate supply of air for combus tion ventilation and dilution of flue gases Combusti...

Page 16: ...nted vertical terminals may be field fabricated Standard PVC SRD fittings may be used Terminal configuration must comply as detailed in this section When selecting the locations for vent termination t...

Page 17: ...ater tight seal 7 Support the vent piping such that it is angled 1 4 per lin ear foot so that condensate will flow back towards the furnace Piping should be supported with pipe hangers to prevent sagg...

Page 18: ...Table 5 on page 16 Follow all notes installation procedures and required materials in the METHOD TWO ONE PIPE SYSTEM on page 14 to install the vent pipe from the unit to the outdoors VENT TERMINATION...

Page 19: ...quiva lent pipe be field installed as drain pipe The condensate piping may be tied together with the air conditioning con densate drain if the air conditioning condensate drain line is trapped upstrea...

Page 20: ...furnace the gas piping may be full of air In order to purge this air it is recommended that the ground union be loosened until the odor of gas is detected When gas is detected immediately retighten th...

Page 21: ...more accurate input rate adjustment To calculate a meter correction factor use the following formula Using the information from above calculate the gas input rat ing by multiplying the number of cubi...

Page 22: ...djustment 1 Turn off all electrical power to the system at main fuse or circuit breaker 2 Attach a manometer to the outlet pressure tap of the valve 3 Turn on power and energize main and redundant P M...

Page 23: ...crease the rise All direct drive blowers have multi speed motors The blower motor speed taps are located in the control box in the blower compartment Refer to Figure 28 and the unit wiring label to ch...

Page 24: ...ion of the circulating blower NOTE EAC and HUM power leads are provided in the junction box for easier installation FIGURE 27 Upflow Models P XU G9D UP Reading Gas Pressure GAS VALVE U TUBE MANOMETER...

Page 25: ...5 1075 1060 1045 1030 1000 960 910 830 755 LOW 805 795 785 770 755 730 700 655 615 565 80 75 1600 C HIGH 1940 1905 1870 1815 1760 1700 1620 1555 1460 1305 MED 1400 1390 1380 1370 1355 1320 1285 1255 1...

Page 26: ...urnace with 2 return openings and operating on high speed blower it is found that total sys tem static is 0 58 w c To determine the system airflow com plete the following steps 1 Obtain the airflow va...

Page 27: ...035 17480 000 Rev A 800 Unitary Products Group 27 FIGURE 29 Sequence Timing For 50a51 243 Control...

Page 28: ...eriod the gas valve is de energized the ignitor is turned off and the 50A51 control goes into the retry sequence The retry sequence provides a 120 second wait with inducer inter purge following an uns...

Page 29: ...l the filter simply reverse this procedure Lubrication Blower motors in these furnaces are permanently lubricated and do not require periodic oiling BLOWER CARE Even with good filters properly in plac...

Page 30: ...valves in the gas line to the furnace must be open 3 Make sure all wiring connections are secure 4 Review the sequence of operation Start the system by setting the thermostat above the room temperatur...

Page 31: ...used by a number of problems blocked vent or chimney faulty inducer cracked pressure switch hose 7 FLASH This fault code indicates that flame could not be established This no light condition occurred...

Page 32: ...NACE RELAY IGNITER GV GRD DOOR SWITCH N O SW ELEMENTARY DIAGRAM POWER SUPPLY 120 1 60 SEE NOTE 1 GRD DS C NO LS1 C 1LP COM 120V 24V SEC PRI 1T 40VA VENTOR MOTOR HSI NOTES LEGEND DOT DELAY ON TIMER FUS...

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