background image

NOTE:

Read the entire instruction manual before starting the

installation.

This symbol

indicates a change since the last issue.

Index

Page

SAFETY CONSIDERATIONS ................................................1-2

Clearances From Combustible Materials .................................1
Dimensional Drawing ...............................................................2

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS

PROCEDURE........................................................................2-3

INTRODUCTION ..........................................................................3
LOCATION ................................................................................3-4

General ......................................................................................3
Location Relative to Cooling Equipment ................................3
Hazardous Locations .............................................................3-4

AIR FOR COMBUSTION AND VENTILATION ...................4-5

Unconfined Space .....................................................................4
Confined Space......................................................................4-5

SUPPLY-AIR PLENUM INSTALLATION (DOWNFLOW)..5-6

Installation On a Concrete Slab ...............................................5
Installation On a Combustible Floor ....................................5-6

HORIZONTAL ATTIC INSTALLATION ...................................6

Construct a Working Platform .................................................6
Install Furnace...........................................................................6

HORIZONTAL CRAWLSPACE INSTALLATION....................6
FILTER ARRANGEMENT .......................................................6-7
GAS PIPING ..................................................................................7
ELECTRICAL CONNECTIONS...............................................7-8

115-v Wiring.............................................................................8
24-v Wiring...............................................................................8
Accessories................................................................................8

VENTING ......................................................................................8
START-UP, ADJUSTMENT, AND SAFETY CHECK .........8-15

General.................................................................................8-10
Sequence Of Operation .....................................................10-12
Heating Mode..........................................................................10
Cooling Mode .........................................................................10
Continuous Blower Mode.......................................................10
Heat Pump Mode ....................................................................10
Start-up Procedures............................................................10-12
Adjustments .......................................................................12-15
Set Gas Input Rate..................................................................12
Set Temperature Rise ........................................................13-14
Set Thermostat Heat Anticipator............................................14
Check Safety Controls.......................................................14-15
Checklist..................................................................................15

SAFETY CONSIDERATIONS

Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained and qualified person-
nel should install, repair, or service heating equipment.
Untrained personnel can perform basic maintenance functions
such as cleaning and replacing air filters. All other operations must
be performed by trained service personnel. When working on
heating equipment, observe precautions in the literature, on tags,
and on labels attached to or shipped with the unit and other safety
precautions that may apply.

Follow all safety codes. In the United States, follow all safety
codes including the National Fuel Gas Code (NFGC) NFPA No.
54-1992/ANSI Z223.1-1992. In Canada, refer to the current
edition of the National Standard of Canada CAN/CGA-B149.1-
and .2-M91 Natural Gas and Propane Installation Codes (NSC-
NGPIC). Wear safety glasses and work gloves. Have fire extin-
guisher available during start-up and adjustment procedures and
service calls.

®

ama

CANADIAN   GAS   ASSOCIATION

A PP R O VED

R

TABLE 1—CLEARANCES FROM COMBUSTIBLE

MATERIALS (IN.)

UNIT SIZE

050 AND 070

095-135

DOWNFLOW (In Alcove or Closet)

Sides

Single-Wall Vent

1

0

Type B-1 Double-Wall Vent

0

0

Back

0

0

Top

1

1

Front

Single-Wall Vent

6†

6†

Type B-1 Double-Wall Vent

3†

3†

Vent

Single-Wall Vent

6

6

Type B-1 Double-Wall Vent

1

1

HORIZONTAL (Attic, Alcove, or Crawlspace)

Sides *

1

0

Back

0

0

Top

Single-Wall Vent

1

1

Type B-1 Double-Wall Vent

1

1

Front‡

Single-Wall Vent

6†

6†

Type B-1 Double-Wall Vent

3†

3†

Vent

Single-Wall Vent

6

6

Type B-1 Double-Wall Vent

1

1

HORIZONTAL (In Closet)

Sides *

1

1

Back

0

0

Top

Single-Wall Vent

2

2

Type B-1 Double-Wall Vent

2

2

Front

Single-Wall Vent

6

6

Type B-1 Double-Wall Vent

3

3

Vent

Single-Wall Vent

6

6

Type B-1 Double-Wall Vent

1

1

* Indicates supply or return sides when furnace is in the horizontal position.

† Clearance shown is for outlet end. The inlet end must maintain 6-in.
minimum clearance from the vent to combustible materials when using
single-wall vent.

‡ Minimum 18-in. front clearance required for alcove.
NOTES:
1. Provide 30-in. front clearance for servicing. An open door in front of the
furnace can meet this requirement.
2. A minimum clearance of 3 in. must be provided in front of the furnace for
combustion air and proper operation.
3. Line contact is permitted as shown in Fig. 7.

installation, startup,
and operating instructions

DOWNFLOW/HORIZONTAL
GAS-FIRED
INDUCED-COMBUSTION FURNACES

Cancels:

II 373L-35-14

II 373L-35-15

7-15-95

373LAV

SERIES E

—1—

Summary of Contents for GAS-FIRED INDUCED-COMBUSTION FURNACES 373LAV

Page 1: ...safety codes In the United States follow all safety codes including the National Fuel Gas Code NFGC NFPA No 54 1992 ANSI Z223 1 1992 In Canada refer to the current edition of the National Standard of...

Page 2: ...during the procedure These precautions will help to avoid exposing the control to electrostatic discharge by putting the furnace the control and the person at the same electro static potential 1 Disc...

Page 3: ...n fire electrical shock or other conditions which may cause personal injury loss of life or property damage Consult a qualified installer service agency local gas supplier or your distributor or branc...

Page 4: ...an equal or greater amount of air is supplied to the room B Confined Space A confined space has volume less than 50 cu ft per 1000 Btuh of the total input ratings of all appliances installed in that...

Page 5: ...OUTDOORS 1 SQ IN PER 4000 BTUH RETURN AIR VENT THROUGH ROOF CATEGORY I D B A C E 1 SQ IN PER 4000 BTUH DUCT TO OUTDOORS SUPPLY AIR 1 SQ IN PER 2000 BTUH DUCTS TO OUTSIDE 12 MAX 12 MAX CONFINED SPACE 1...

Page 6: ...red length 1 X 3 8 in flat washer 3 8 in lockwasher and 3 8 in nut Dimples are provided for hole locations See Fig 1 Since horizontal crawlspace installation is very similar to the attic installation...

Page 7: ...ent trap in the riser leading to the furnace The trap can be installed by connecting a tee to the riser leading from the furnace Connect a capped nipple into the lower end of the tee The capped nipple...

Page 8: ...nergized with 115v 1 5 amp maximum during blower motor operation 2 Humidifier HUM Quick connect terminal HUM and screw terminal Com are provided for 24 v humidifier connection The terminals are energi...

Page 9: ...FIELD SUPPLIED FUSED DISCONNECT CONDENSING UNIT TWO WIRE FURNACE R G C W C R G Y GND GND FIELD 24 VOLT WIRING FIELD 115 208 230 460 VOLT WIRING FACTORY 24 VOLT WIRING FACTORY 115 VOLT WIRING 208 230...

Page 10: ...satisfied R G and R Y circuits are broken Furnace blower and EAC continue operating on cooling speed for an additional 90 sec 3 Continuous blower mode NOTE EAC 1 terminal is energized with 115v whene...

Page 11: ...ESSURE SWITCH SPST N O TEST TWIN COMPONENT TEST TWIN TERMINAL TRAN TRANSFORMER 115VAC 24VAC JUNCTION UNMARKED TERMINAL PCB TERMINAL FACTORY WIRING 115VAC FACTORY WIRING 24VAC FIELD WIRING 115VAC FIELD...

Page 12: ...Specific gravity 0 58 Therefore Orifice No 44 Manifold pressure 3 6 in wc The furnace is shipped with No 43 orifices Therefore in this example all main burner orifices must be changed and the manifold...

Page 13: ...9 3 4 3 7 3 2 40 41 39 3 5 3 8 3 3 40 38 39 3 6 3 2 3 4 40 38 39 3 8 3 3 3 5 38 39 3 4 3 6 38 39 3 4 3 7 890 41 42 3 2 3 6 41 42 3 4 3 7 40 41 3 2 3 5 40 41 3 3 3 6 40 41 39 3 4 3 7 3 2 40 41 39 3 5 3...

Page 14: ...nd operates if there is a motor failure TABLE 8 GAS RATE CU FT HR SECONDS FOR 1 REVOLUTION SIZE OF TEST DIAL SECONDS FOR 1 REVOLUTION SIZE OF TEST DIAL 1 cu ft 2 cu ft 5 cu ft 1 cu ft 2 cu ft 5 cu ft...

Page 15: ...n properly and correct condition e Turn off 115 v power to furnace f Reconnect inducer motor wires replace control door and turn on 115 v power to furnace 4 Check auxiliary limits when used a Turn off...

Page 16: ...ing popular video based formats and materials All include video and or slides plus companion book Classroom Service Training plus hands on the products in our labs can mean increased confidence that r...

Reviews: