RenewAire GH Series, GH-150, GH-050, GH-175, GH-075 Installation, Operation And Maintenance Manual
...
GH SERIES Indirect Gas-Fired Duct Furnace
Installation, Operation and Maintenance Manual
GH-Series for Indoor and Outdoor Commercial Applications
GH Indoor Series shown
GH Rooftop Series shown
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
WARNING AVERTISSEMENT
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
u
Do not try to light any appliance.
u
Do not touch any electrical switch; do not use any phone
in your building.
u
Leave the building immediately.
u
Immediately call your gas supplier from a phone remote
from the building. Follow the gas supplier’s instructions.
u
If you cannot reach your gas supplier, call the fire depart-
ment.
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
Ne pas entreposer ni utiliser d’essence ou autre vapeurs ou
liquides inflammable à proximité de cet appareil ou de tout
autre appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ
u
Ne tentez pas d’allumer un appareil.
u
Ne touchez pas à un interrupteur; n’utilisez pas de télé-
phone dans l’édifice où vous vous trouvez.
u
Sortez de l’édifice immédiatement.
u
Appelez immédiatement le fournisseur de gaz à par-
tir d’un téléphone à l’exterieur de l’édifice. Suivez les
instructions du fournisseur de gaz.
u
Si vous ne pouvez joindre le fournisseur de gaz, appelez
les pompiers.
L’installation at les réparations doivent être confiées à un
installateur qualifié ou au fournisseur de gaz.
WARNING AVERTISSEMENT
RISQUE FLASH D’ARC ET DE CHOC ÉLECTRIQUE
ARC FLASH AND ELECTRIC SHOCK HAZARD
Arc flash and electric shock hazard. Disconnect all electric
power supplies, verify with a voltmeter that electric power
is off and wear protective equipment per NFPA 70E before
working within electric control enclosure. Failure to comply
can cause serious injury or death.
Customer must provide earth ground to unit, per NEC, CEC
and local codes, as applicable.
Before proceeding with installation, read all instructions,
verifying that all the parts are included and check the
nameplate to be sure the voltage matches available utility
power.
The line side of the disconnect switch contains live
high-voltage.
The only way to ensure that there is NO voltage inside the
unit is to install and open a remote disconnect switch and
verify that power is off with a volt meter. Refer to unit electrical schematic.Follow all local codes.
Risque d’arc êlectrique et de choc électrique. Débrancher
toutes les alimentation électrique, vérifier avec un voltmètre
que l’alimentation électrique est coupée et portez des vêtements de protection conformément à la norme NFPA 70E
avant de travailler dans la console de commande électrique.
Le non-respect peut entraîner des blessures graves ou la
mort.
Le client doit fournir la terre à l’unité, selon les codes NEC,
CEC et locaux, selon le cas.
Avant de procéder à l’installation, lisez toutes les instructions, vérifiez que toutes les pièces sont incluses at vérifier
la plaque signalétique pour vous assurer que la tension
correspond à la puissance disponible du réseau.
Le côté entrée du sectionneur contient une haute tension
active.
La seule façon de s’assurer qu’il n’y a pas de tension à
l’intérieur de l’unité est d’installer et d’ouvrir un interrupteur
de déconnexion à distance et de vérifier que l’alimentation
est coupée à l’aide d’un voltmètre. Référe-vous au schéma
électrique de l’appareil.
Suivez tous les codes locaux.
WARNING
RISK OF FIRE OR EXPLOSION
Do not install duct furnace where it may be exposed to potentially explosive or flammable vapors!
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any module.
Do not install in potentially explosive atmosphere laden with
dust, sawdust or similar products.
1.800.627.44992
AVERTISSEMENT
RISQUE D’INCENDIE OU D’EXPLOSION
N'installez pas le four à condoits là oùil peut être exposé à des
vapeurs potentiellement explosives ou inflammables.
Ne stockez pas et n'utilisez pas d'essence ou d'autres vapeurs
et liquides inflammables à proximité de ce module ou de tout
autre module. Ne pas installer dans une atmosphère potentiellement explosive chargée de poussière, de sciure de bois ou de
produits similaires.
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
CAUTION ATTENTION
RISK OF ELECTRIC SHOCK OR EQUIPMENT DAMAGE.
Whenever electrical wiring is connected, disconnected
or changed, the power supply to the module and module
controls must be disconnected. Lock and tag the disconnect
switch or circuit breaker to prevent accidental reconnection
of electric power.
Do not install units in locations where flue products can be
drawn into adjacent building openings such as windows, fresh
air intakes, etc. Distance from vent terminal to adjacent public
walkways, adjacent buildings, operable windows and building
openings shall conform with the local codes. In the absence of
local codes, installation shall conform with the National Fuel Gas
Code, ANSI Z223.1 or the Canadian CAN/CGA B-149
Installation Codes.
CAUTION
Installation of wiring must conform with local building codes. In
the absence of local building codes, installation must conform
to the National Electric Code ANSI/NFPA 70 - Latest Edition.
Unit must be electrically grounded in conformance with this
code. In Canada, wiring must comply with CSA C22.1, Canadian Electrical Code.
RISQUE DE CHOC ELECTRIQUE OU DE DOMMAGE
D'APPAREIL
Chaque fois que le câblage électrique est connecté, déconnecté ou changé, l'alimentation électrique du module et des
commandes du module doit être déconnectée. Verrouillez
et étiquetez le sectionneur ou le disjoncteur pour éviter une
reconnexion accidentelle de l'alimentation électrique.
ATTENTIONCAUTION
N'installez pas les appareils dans des endroits où les produits
de combustion peuvent être aspirés dans les ouvertures de
bâtiment adjacentes, comme les fenêtres, les prises d'air frais,
etc.
La distance entre le terminal de ventilation et les allées
publiques adjacentes, les bâtiments adjacents, les fenêtres
ouvrantes et les ouvertures de bâtiment doivent être conformes
aux codes locaux. En l'absence de codes locaux, l'installation
doit être conforme au Code national du gaz combustible, à la
norme ANSI Z223.1 ou aux codes d'installation Canadiens CAN
/ CGA B-149.
ATTENTION
L'installation du câblage doit être conforme aux codes du
bâtiment locaux. En l'absence de codes de construction locaux,
l'installation doit être conforme au Code national de l'électricité
ANSI/NFPA 70 - dernière édition. L'unité doit être mise à la
terre électriquement conformément à ce code. Au Canada,
le câblage doit être conforme à la norme CSA C22.1 du Code
Canadien de l'électricité.
NOTICE
This equipment is to be installed by following Industry Best
Practices and all applicable codes. Any damage to
components, assemblies, subassemblies or the cabinet which
is caused by improper installation practices will void the
warranty.
NOTE: See additional cautions
and warnings in Section 7, Gas
Piping Installation.
IMPORTANT
Cet équipement doit être installé en suivant les meilleures
pratiques de l'industrie et tous les codes applicables. Tout
dommage aux composants, aux assemblages, aux sous-ensembles ou à l'armoire qui est causé par des pratiques d'installation incorrectes annulera la garantie.
REMARQUE: Voir les mises en
garde et les avertissements
supplémentaires de la Section 7,
Installation de Tuyauterie de Gaz.
31.800.627.4499
OWNER INFORMATION
ACCESSORY
NOTE: This page
is to be completed
by the installing
contractor. The
completed document is
to be turned over to the
owner after start-up.
GH-Series Indirect Gas-Fired Duct Furnace
SAVE THIS MANUAL
UNIT RECORDS
Record information as shown below. In the unlikely event that factory assistance is ever
required, this information will be needed.
Locate the RenewAire unit label, found inside the removable panel on the furnace.
NOTE: This information is for purposes of identifying the specific furnace. Unit-specific option
data can then be obtained, as needed, from the Model Number. See Gas Furnace Code in this
manual for further details.
Furnace Model No:
Serial Number:
Furnace Turndown: Single Stage
Two-Stage
Modulated 5:1
Modulated 10:1
TYPICAL UNIT LABEL (FOUND INSIDE THE
REMOVABLE PANEL ON THE FURNACE)
1.800.627.44994
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
THIS PAGE IS INTENTIONALLY LEFT BLANK.
THIS PAGE IS INTENTIONALLY LEFT BLANK
51.800.627.4499
OPTIONS & ACCESSORIES
INDOOR
TemperatureRise(deg.F)
GasFurnace250‐ 400MBH
PressureDrop(inch‐w.c.)
TemperatureRise(deg.F)
GasFurnace50‐ 200MBH
OPTIONS & ACCESSORIES
DUCT FURNACE DIMENSIONS
View Port
3/8" Condensate
Drain Tube
3/4" Gas Connection
Power Wiring and
Control Wiring
Inlet Fittings
FRONT VIEW
6 1/8"
3"
24"
Opening
14 7/8"
Opening
25"
Case
47 3/8"
Case
RIGHT VIEW
14 7/8"
Opening
24"
Opening
3"
LEFT VIEW
36"
Service Area
TOP VIEW
NOTES
UNLESS OTHERWISE SPECIFIED,
1.
DIMENSIONS ARE ROUNDED TO THE
NEAREST EIGHTH OF AN INCH.
SPECIFICATIONS SUBJECT TO
2.
CHANGE WITHOUT NOTICE.
Size
Tubes
Input Rate Output
Min/Max Temperature Rise through Furnace (
°F) Vent Locations
Unit
Weight
Shipping
Weight
20 25 30 35 40 45 50 55 60
IN-KI, IN-SI Diameter
"W" "L" "H" "D"
MBH Qty. Btuh Btuh Nom. Duct Opening Airfl ow (CFM)
inch
inch inch inch lb lb
50 3 50,000 40,000
1852 1481 1235 1058 926 823 741 673 617
15.7
47.8 22.9
5
127 207
75 3 75,000 60,000
2778 2222 1852 1587 1389 1235 1111 1010 926
15.7 127 207
100 4 100,000 80,000
3704 2963 2469 2116 1852 1646 1481 1347 1235
18.4 142 222
125 5 125,000 100,000
4630 3704 3086 2646 2315 2058 1852 1684 1543
21.2 169 249
150 6 150,000 120,000
5556 4444 3704 3175 2778 2469 2222 2020 1852
23.9 160 240
175 7 175,000 140,000
6481 5185 4321 3704 3241 2881 2593 2357 2160
26.7 180 260
200 8 200,000 160,000
7407 5926 4938 4233 3704 3292 2963 2694 2469
29.4
6
196 276
250 10 250,000 200,000
9259 7407 6173 5291 4630 4115 3704 3367 3086
34.9 245 325
300 12 300,000 240,000
11111 8889 7407 6349 5556 4938 4444 4040 3704
40.4 279 384
350 14 350,000 280,000
12963 10370 8642 7407 6481 5761 5185 4714 4321
45.9 324 429
400 15 400,000 320,000
14815 11852 9877 8466 7407 6584 5926 5387 4938
48.7 394 499
TABLE 2
INDIRECT GAS-FIRED DUCT FURNACE DIMENSIONS
Note: For a single furnace, 20° F minimum temperature rise, 60° F maximum temperature rise.
14.89
22.92
(H)
23.99
W
47.85
(L)
FLUE GAS EXHAUST
D
COMBUSTION AIR INLET
23.99
14.89
22.92
(H)
W
47.85
(L)
FLUE GAS EXHAUST
D
COMBUSTION AIR INLET
D
FIGURE 3 IN-KI (TOP EXHAUST INDOOR) FIGURE 4 IN-SI (SEPARATE INLET EXHAUST INDOOR)
Indirect Gas-Fired Duct Furnace
Download specification at:
renewaire.com/specifications
Indirect Gas-Fired Duct Furnace
INDOORGH
Indoor IN-KI shown
Accessory
SPECIFICATIONS
Heat er Typ e:
Indirect Gas-Fired Duct Furnace
Typical Input Capacity (MBH):
50, 75, 100, 125, 150, 175,
200, 250, 300, 350, 400
Standard Features:
Tubular heaters
Indirect natural gas fi red
Indoor installation
80% thermal effi ciency
Horizontal airfl ow
Rated for elevations from 0 – 2,000 ft.
409 stainless steel heat exchanger
409 stainless steel burners
Flue/combustion air – indoor models
Vertical (separated indoor)
Vertical top exhaust with louvered intake
Direct spark ignition
1-stage/2-stage gas controls
Induced draft venting
Terminal block for power and control wiring
Automatic high limit safety shut-off
Auxiliary manual high limit switch
Combustion air pressure switch
Air proving switch
Combination gas valve with shutoff
Standard Features (continued):
Flame rollout switch
Manual shut off valve
3/8" condensate drain connection
Voltages & Phase:
Single phase - 120V, 208V, 230V
Control Voltage:
24 VAC
Dimensions:
See table 2
Shipping:
Shipped loose with base unit and installed in the fi eld
Options:
Indirect propane fi red fuel
Elevation correction for elevation > 2,000 ft.
304 stainless steel heat exchanger
5:1 continuous electronic modulation for all furnaces
10:1 continuous electronic modulation for furnaces
200 MBH and larger
Duct thermostat for modulation control
Disconnect switch
Power fusing
Accessory:
Duct thermostat for 1-stage/2-stage control
Duct thermostat for modulation control
FLUE AND COMBUSTION AIR CONFIGURATION
IN-KI
(TOP EXHAUST)
FLUE
EXHAUST
AIRFLOW
AIRFLOW
AIRFLOW
COMBUSTION
INTAKE
TEMPERATURE RISE AND PRESSURE DROP
IN-SI
(SEPARATE INLET EXHAUST)
FLUE
EXHAUST
COMBUSTION
INTAKE
Note: The total equivalent length of vent pipe must not exceed 50 feet. If equivalent length exceeds 50 feet refer
to IOM for recommendations.
Caution: All indirect gas-fi red duct furnaces to be installed downstream of the ERV and on the positive side of the
supply fan.
AIRFLOW
AIRFLOWAIRFLOW
AIRFLOW
AIRFLOW
AIRFLOW
FIGURE 1 GAS FURNACE 50-200 MBH FIGURE 2 GAS FURNACE 250-400 MBH
60
55
50
45
40
35
30
25
20
0 1000 2000 3000 4000 5000 6000 7000
1.800.627.44996
75
50
200
175
150
125
100
Airflow(CFM)
50/75
100
150
125
0.32
0.28
200
0.24
175
0.20
0.16
0.12
0.08
0.04
0.00
60
55
50
45
40
35
30
25
20
2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000
250
400
350
300
Airflow(CFM)
400
350
300
250
1.6
1.4
1.2
1.0
0.8
0.6
PressureDrop(in.‐w.c.)
0.4
0.2
0.0
OPTIONS & ACCESSORIES
DUCT FURNACE DIMENSIONS
View Port
3/8" Condensate
Drain Tube
3/4" Gas Connection
Power Wiring and
Control Wiring
Inlet Fittings
FRONT VIEW
6 1/8"
3"
24"
Opening
14 7/8"
Opening
25"
Case
47 3/8"
Case
RIGHT VIEW
14 7/8"
Opening
24"
Opening
3"
LEFT VIEW
36"
Service Area
TOP VIEW
NOTES
UNLESS OTHERWISE SPECIFIED,
1.
DIMENSIONS ARE ROUNDED TO THE
NEAREST EIGHTH OF AN INCH.
SPECIFICATIONS SUBJECT TO
2.
CHANGE WITHOUT NOTICE.
Size
Tubes
Input Rate Output
Min/Max Temperature Rise through Furnace (
°F
)
Vent Locations
Unit
Weight
Shipping
Weight
20 25 30 35 40 45 50 55 60
IN-KI, IN-SI Diameter
"W" "L" "H" "D"
MBH Qty. Btuh Btuh Nom. Duct Opening Airfl ow (CFM)
inch
inch inch inch lb lb
50 3 50,000 40,000
1852 1481 1235 1058 926 823 741 673 617
15.7
47.8 22.9
5
127 207
75 3 75,000 60,000
2778 2222 1852 1587 1389 1235 1111 1010 926
15.7 127 207
100 4 100,000 80,000
3704 2963 2469 2116 1852 1646 1481 1347 1235
18.4 142 222
125 5 125,000 100,000
4630 3704 3086 2646 2315 2058 1852 1684 1543
21.2 169 249
150 6 150,000 120,000
5556 4444 3704 3175 2778 2469 2222 2020 1852
23.9 160 240
175 7 175,000 140,000
6481 5185 4321 3704 3241 2881 2593 2357 2160
26.7 180 260
200 8 200,000 160,000
7407 5926 4938 4233 3704 3292 2963 2694 2469
29.4
6
196 276
250 10 250,000 200,000
9259 7407 6173 5291 4630 4115 3704 3367 3086
34.9 245 325
300 12 300,000 240,000
11111 8889 7407 6349 5556 4938 4444 4040 3704
40.4 279 384
350 14 350,000 280,000
12963 10370 8642 7407 6481 5761 5185 4714 4321
45.9 324 429
400 15 400,000 320,000
14815 11852 9877 8466 7407 6584 5926 5387 4938
48.7 394 499
TABLE 2
INDIRECT GAS-FIRED DUCT FURNACE DIMENSIONS
Note: For a single furnace, 20° F minimum temperature rise, 60° F ma ximum temperature rise.
14.89
22.92
(H)
23.99
W
47.85
(L)
FLUE GAS EXHAUST
D
COMBUSTION AIR INLET
23.99
14.89
22.92
(H)
W
47.85
(L)
FLUE GAS EXHAUST
D
COMBUSTION AIR INLET
D
FIGURE 3 IN-KI (TOP EXHAUST INDOOR) FIGURE 4 IN-SI (SEPARATE INLET EXHAUST INDOOR)
71.800.627.4499
DATE
BY
RenewAire LLC
SCALE:1:24
SIZE
DWG. NO.
A
MATERIAL:
DESCRIPTION OF REVISION
HDG100-M-KI
DATE:
SHEET 1 OF 1
SURFACE FINISH =
3
AND TOL. ANSI Y14.5
FINISH:
CHECKED BY:
DO NOT SCALE DRAWING.
TITLE:
TOLL FREE: (800) 627-4499
SK4700A
DRAWN BY:
APPLICABLE STANDARDS: DIM.
SHARP EDGES.
REMOVE ALL BURRS, BREAK
63 MICROINCH MINIMUM
DATE:
UNLESS OTHERWISE SPECIFIED,
DIMENSIONS ARE IN INCHES.
TOLERANCES:
LINEAR 0.015
HOLE SIZE 0.005
ANGULARITY
4510 Helgesen Dr.
Madison, WI 53718 USA
TEL: (608) 221-4499
FAX: (608) 221-2824
DIM SPEC
6 1/8"
Case
47 3/8"
14 7/8"
Opening
3"
RIGHT VIEW
UNLESS OTHERWISE SPECIFIED, 1.
DIMENSIONS ARE ROUNDED TO THE
NEAREST EIGHTH OF AN INCH.
SPECIFICATIONS SUBJECT TO 2.
CHANGE WITHOUT NOTICE.
NOTES
TOP VIEW
36"
Service Area
25"
View Port
Case
24"
Opening
Drain Tube
3/8" Condensate
3/4" Gas Connection
FRONT VIEW
Inlet Fittings
Control Wiring
Power Wiring and
24"
Opening
3"
14 7/8"
Opening
MODEL GH INDOOR DIMENSIONED DRAWING
1.800.627.44998
6 1/8"
LEFT VIEW
OPTIONS & ACCESSORIES
ROOFTOP
Indirect Gas-Fired Duct Furnace SPECIFICATIONS
Heat er Typ e:
Indirect Gas-Fired Duct Furnace
Typical Input Capacity (MBH):
50, 75, 100, 125, 150, 175,
200, 250, 300, 350, 400
Standard Features:
Tubular heaters
Indirect natural gas fi red
Outdoor installation
80% thermal effi ciency
Horizontal airfl ow
Rated for elevations from 0 – 2,000 ft.
409 stainless steel heat exchanger
409 stainless steel burners
Flue/combustion air – outdoor models
Horizontal separated outdoor with hoods
Vertical top exhaust with intake hood
Direct spark ignition
2-stage gas controls
Induced draft venting
Terminal block for power and control wiring
Automatic high limit safety shut-off
Auxiliary manual high limit switch
Combustion air pressure switch
Air proving switch
Standard Features (continued):
Combination gas valve with shutoff
Flame rollout switch
Manual shut off valve
3/8" condensate drain connection
Voltages & Phase:
Single phase - 120V, 208V, 230V
Control Voltage:
24 VAC
Dimensions:
See table 1
Shipping:
Shipped loose with base unit and installed in the fi eld
Options:
Indirect propane fi red fuel
Elevation correction for elevation > 2,000 ft.
304 stainless steel heat exchanger
5:1 continuous electronic modulation for all furnaces
10:1 continuous electronic modulation for furnaces
200 MBH and larger
Duct thermostat for modulation control
Disconnect switch
Power fusing
Accessory:
Duct thermostat for 2-stage control
Duct thermostat for modulation control
Duct curb
Rooftop RT-NO shown
COMBUSTION
INTAKE
FLUE
EXHAUST
RT-NO
(TOP EXHAUST)
FLUE
EXHAUST
COMBUSTION
INTAKE
AIRFLOW
AIRFLOW
AIRFLOWAIRFLOW
AIRFLOW
AIRFLOWAIRFLOW
AIRFLOW
AIRFLOW
COMBUSTION
INTAKE
(FRONT EXHAUST)
COMBUSTION
INTAKE
RT-WO
FLUE
EXHAUST
AIRFLOW
AIRFLOW
AIRFLOW
COMBUSTION
INTAKE
AIRFLOW
AIRFLOW
AIRFLOWAIRFLOW
AIRFLOW
AIRFLOWAIRFLOW
AIRFLOW
AIRFLOW
FLUE AND COMBUSTION AIR CONFIGURATION
TEMPERATURE RISE AND PRESSURE DROP
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
20
25
30
35
40
45
50
55
60
2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000
PressureDrop(in.‐w.c.)
TemperatureRise(deg.F)
Airflow(CFM)
GasFurnace250‐ 400MBH
400
350
300
250
400
350
300
250
0.00
0.04
0.08
0.12
0.16
0.20
0.24
0.28
0.32
20
25
30
35
40
45
50
55
60
0 1000 2000 3000 4000 5000 6000 7000
PressureDrop(inch‐w.c.)
TemperatureRise(deg.F)
Airflow(CFM)
GasFurnace50‐ 200MBH
125
150
175
200
100
50/75
200
175
150
125
100
75
50
FIGURE 1 GAS FURNACE 50-200 MBH FIGURE 2 GAS FURNACE 250-400 MBH
OUTDOORGH
Indirect Gas-Fired Duct Furnace
Accessory
Caution: All indirect gas-fi red duct furnaces to be installed downstream of the ERV and on the positive side of the
supply fan.
Download specification at:
renewaire.com/specifications
OPTIONS & ACCESSORIES
47.85
(L)
W
22.92
(H)
14.89
23.99
FLUE GAS EXHAUST
D
COMBUSTION AIR INLET
47.85
(L)
23.99
34.92
(H)
14.89
W
FLUE GAS EXHAUST
COMBUSTION AIR INLET
DUCT FURNACE DIMENSIONS
View Port
3/8" Condensate
Drain Tube
3/4" Gas Connection
FRONT VIEW
Power Wiring and
Control Wiring
Inlet Fittings
Case
37" (WO) Shown
25" (NO)
47 7/8"
Case
24"
Opening
3"
6 1/8"
14 7/8"
Opening
RIGHT VIEW
24"
Opening
3"
6 1/8"
14 7/8"
Opening
LEFT VIEW
36"
Service Area
TOP VIEW
NOTES
UNLESS OTHERWISE SPECIFIED,
1.
DIMENSIONS ARE ROUNDED TO THE
NEAREST EIGHTH OF AN INCH.
SPECIFICATIONS SUBJECT TO
2.
CHANGE WITHOUT NOTICE.
INDIRECT GAS-FIRED DUCT FURNACE DIMENSIONS
Size
Tubes
Input Rate Output
Min/Max Temperature Rise through Furnace (
°F) Vent Locations
Unit
Weight
Shipping
Weight
20 25 30 35 40 45 50 55 60
RT-NO, RT-WO RT-NO RT-WO Diameter
"W" "L" "H" "H" "D"
MBH Qty. Btuh Btuh Nom. Duct Opening Airfl ow (CFM)
inch
inch inch inch inch lb lb
50 3 50,000 40,000
1852 1481 1235 1058 926 823 741 673 617
15.7
47.8 22.9 34.9
5
127 207
75 3 75,000 60,000
2778 2222 1852 1587 1389 1235 1111 1010 926
15.7 127 207
100 4 100,000 80,000
3704 2963 2469 2116 1852 1646 1481 1347 1235
18.4 142 222
125 5 125,000 100,000
4630 3704 3086 2646 2315 2058 1852 1684 1543
21.2 169 249
150 6 150,000 120,000
5556 4444 3704 3175 2778 2469 2222 2020 1852
23.9 160 240
175 7 175,000 140,000
6481 5185 4321 3704 3241 2881 2593 2357 2160
26.7 180 260
200 8 200,000 160,000
7407 5926 4938 4233 3704 3292 2963 2694 2469
29.4
6
196 276
250 10 250,000 200,000
9259 7407 6173 5291 4630 4115 3704 3367 3086
34.9 245 325
300 12 300,000 240,000
11111 8889 7407 6349 5556 4938 4444 4040 3704
40.4 279 384
350 14 350,000 280,000
12963 10370 8642 7407 6481 5761 5185 4714 4321
45.9 324 429
400 15 400,000 320,000
14815 11852 9877 8466 7407 6584 5926 5387 4938
48.7 394 499
TABLE 1
FIGURE 3 RT-NO (TOP EXHAUST OUTDOOR) FIGURE 4 RT-WO (FRONT EXHAUST OUTDOOR)
Note: For a single furnace, 20° F minimum temperature rise, 60° F maximum temperature rise.
91.800.627.4499
OPTIONS & ACCESSORIES
DUCT FURNACE DIMENSIONS
LEFT VIEW
FIGURE 3 RT-NO (TOP EXHAUST OUTDOOR) FIGURE 4 RT-WO (FRONT EXHAUST OUTDOOR)
FLUE GAS EXHAUST
COMBUSTION AIR INLET
D
22.92
(H)
14.89
23.99
W
47.85
(L)
TABLE 1
Min/Max Temperature Rise through Furnace (
Size
MBH Qty. Btuh Btuh Nom. Duct Opening Airfl ow (CFM)
50 3 50,000 40,000
75 3 75,000 60,000
100 4 100,000 80,000
125 5 125,000 100,000
150 6 150,000 120,000
175 7 175,000 140,000
200 8 200,000 160,000
250 10 250,000 200,000
300 12 300,000 240,000
350 14 350,000 280,000
400 15 400,000 320,000
Note: For a single furnace, 20° F minimum temperature rise, 60° F maximum temperature rise.
Input Rate Output
Tubes
20 25 30 35 40 45 50 55 60
1852 1481 1235 1058 926 823 741 673 617
2778 2222 1852 1587 1389 1235 1111 1010 926
3704 2963 2469 2116 1852 1646 1481 1347 1235
4630 3704 3086 2646 2315 2058 1852 1684 1543
5556 4444 3704 3175 2778 2469 2222 2020 1852
6481 5185 4321 3704 3241 2881 2593 2357 2160
7407 5926 4938 4233 3704 3292 2963 2694 2469
9259 7407 6173 5291 4630 4115 3704 3367 3086
11111 8889 7407 6349 5556 4938 4444 4040 3704
12963 10370 8642 7407 6481 5761 5185 4714 4321
14815 11852 9877 8466 7407 6584 5926 5387 4938
FLUE GAS EXHAUST
COMBUSTION AIR INLET
°F) Vent Locations
RT-NO, RT-WO RT-NO RT-WO Diameter
"W" "L" "H" "H" "D"
inch
15.7
15.7 127 207
18.4 142 222
21.2 169 249
23.9 160 240
26.7 180 260
29.4
34.9 245 325
40.4 279 384
45.9 324 429
48.7 394 499
14.89
34.92
(H)
Unit
Weight
23.99
W
47.85
(L)
inch inch inch inch lb lb
127 207
5
47.8 22.9 34.9
196 276
6
Shipping
Weight
INDIRECT GAS-FIRED DUCT FURNACE DIMENSIONS
36"
Service Area
TOP VIEW
14 7/8"
Opening
6 1/8"
24"
Opening
3"
Power Wiring and
Control Wiring
Inlet Fittings
FRONT VIEW
View Port
3/8" Condensate
Drain Tube
3/4" Gas Connection
37" (WO) Shown
NOTES
UNLESS OTHERWISE SPECIFIED,
1.
DIMENSIONS ARE ROUNDED TO THE
NEAREST EIGHTH OF AN INCH.
SPECIFICATIONS SUBJECT TO
2.
CHANGE WITHOUT NOTICE.
47 7/8"
Case
Case
25" (NO)
24"
Opening
3"
RIGHT VIEW
14 7/8"
Opening
6 1/8"
1.800.627.449910
14 7/8"
RenewAire LLC
SCALE:1:30
SIZE
DWG. NO.
A
MATERIAL:
FINISH:
DO NOT SCALE DRAWING.
REMOVE ALL BURRS, BREAK
SHARP EDGES.
APPLICABLE STANDARDS: DIM.
AND TOL. ANSI Y14.5
UNLESS OTHERWISE SPECIFIED,
DIMENSIONS ARE IN INCHES.
TOLERANCES:
LINEAR
0.015
HOLE SIZE
0.005
ANGULARITY
3
SURFACE FINISH =
63 MICROINCH MINIMUM
DATE:
DRAWN BY:
HDG-400-M-W
SHEET 1 OF 1
4510 Helgesen Dr.
Madison, WI 53718 USA
TEL: (608) 221-4499
FAX: (608) 221-2824
TOLL FREE: (800) 627-4499
TITLE:
CHECKED BY:
DATE:
FRONT EXHAUST OUTDOOR (WO)
LEVEL
DESCRIPTION OF REVISION
DATE
BY
DIM SPEC
Opening
6 1/8"
UNLESS OTHERWISE SPECIFIED,
DIMENSIONS ARE ROUNDED TO THE
NEAREST EIGHTH OF AN INCH.
SPECIFICATIONS SUBJECT TO
CHANGE WITHOUT NOTICE.
NOTES
1.
2.
Case
47 7/8"
TOP VIEW
Case
25" (NO)
37" (WO) Shown
View Port
3"
RIGHT VIEW
24"
Opening
3/8" Condensate
Drain Tube
3/4" Gas Connection
FRONT VIEW
36"
Service Area
14 7/8"
Opening
MODEL GH OUTDOOR DIMENSIONED DRAWING
6 1/8"
Power Wiring and
Control Wiring
Inlet Fittings
24"
Opening
3"
LEFT VIEW
111.800.627.4499
TABLE OF CONTENTS
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
1.0 OVERVIEW 17
1.1 DESCRIPTION .......................................................17
1.2 GAS SUPPLY .........................................................17
1.3 ELECTRICAL SUPPLY .............................................17
1.4 INPUT CAPACITY IN MBH ......................................17
1.5 GAS FURNACE MODULATION (TURNDOWN) ...........18
1.6 SINGLE AND MULTIPLE FURNACE CONFIGURATIONS
..................................................................................21
1.7 USER INTERFACE .................................................21
2.0 VENTING 22
2.1 EQUIVALENT LENGTH ............................................22
2.2 INDOOR FURNACE VENTING ..................................22
2.3 OUTDOOR FURNACE VENTING ...............................27
3.0 GAS SUPPLY 28
4.0 PLACEMENT RECOMMENDATIONS 29
7.6 FURNACE INSTALLATION REQUIREMENTS ............. 49
7.7 INSTALL CONTROL SENSORS ................................50
7.8 INSTALL GAS SUPPLY PIPING ................................ 50
7.8.1 Installation of Gas Piping ................................................... 50
7.8.2 Determine Gas Supply Requirement ................................... 51
7.9 CONNECT CONDENSATE DRAIN .............................52
7.10 MAKE ELECTRICAL CONNECTIONS ...................... 52
8.0 OPERATING INSTRUCTIONS 53
8.1 START-UP ............................................................. 53
8.2 INLET GAS PRESSURE ..........................................53
8.3 INPUT ..................................................................53
8.4 MANIFOLD PRESSURE ADJUSTMENT ....................53
8.5 FAILURE TO IGNITE ...............................................54
8.6 UNIT START-UP ADJUSTMENTS ............................54
8.6.1 Burner flames ...................................................................54
8.6.2 Shutdown after unit start-up .............................................55
8.6.3 Normal operation .............................................................. 55
9.0 MAINTENANCE 56
5.0 DUCTWORK 29
6.0 COMPONENT TECHNICAL DATA 32
6.1 PERFORMANCE DATA ...........................................32
6.2 FURNACE SIZE SELECTION ...................................33
6.3 MAXIMUM AND MINIMUM AIRFLOWS ....................34
6.4 DUCT FURNACE PRESSURE DROP .........................34
6.5 DIMENSIONAL DRAWINGS ....................................35
6.6 GAS TRAIN SCHEMATICS ......................................36
6.7 GAS VALVE ILLUSTRATIONS ..................................37
6.8 ELECTRICAL DATA ................................................39
6.9 ELECTRICAL SCHEMATICS ....................................40
7.0 FURNACE INSTALLATION 48
7.1 FURNACE INSPECTION ON ARRIVAL ......................48
7.2 PREPARING FOR INSTALLATION ............................48
7.3 INSTALLATION CODES ..........................................48
7.4 PLACEMENT OF FURNACE ....................................48
7.5 CLEARANCE TO COMBUSTIBLES AND SERVICE
CLEARANCES .............................................................49
9.1 FURNACE MODULE INSPECTION ...........................56
9.2 FURNACE MODULE OPERATION CHECK .................56
9.3 SERVICE PARTS ....................................................57
10.0 TROUBLESHOOTING 58
10.1 SEQUENCE OF OPERATIONS (SOO) ......................58
10.2 IGNITION CONTROLLER ....................................... 58
11.0 FACTORY ASSISTANCE 59
12.0 WARRANTY 59
1.800.627.449912
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
TABLE OF ILLUSTRATIONS
Figure 1.5.0 Chart of Available Turndown Options by Furnace Model .................................................. 19
Figure 1.5.1 Typical Installation of Indoor Separate Inlet Exhaust Furnace .......................................... 20
Figure 1.5.2 Typical Installation of Indoor Top Exhaust Furnace .......................................................... 20
Figure 1.5.3 Typical Installation of Outdoor Top Exhaust Furnace ....................................................... 20
Figure 1.5.4 Typical Parallel Furnace Installation ............................................................................... 20
Figure 1.5.5 Typical Factory-Provided Connection Points ................................................................... 20
Figure 1.6.0 Single Unit-Top View ...................................................................................................... 21
Figure 1.6.1 Parallel Unit-Top View .................................................................................................... 21
Figure 2.2.0 Indoor Vertical Venting .................................................................................................. 23
Figure 2.2.1 Indoor Horizontal Venting ............................................................................................... 24
Figure 2.2.2 Vertical Venting - Separate Combustion ......................................................................... 26
Figure 2.2.3 Horizontal Venting - Separate Combustion ..................................................................... 26
Figure 2.3.0 Outdoor Horizontal Venting ............................................................................................ 27
Figure 2.3.1 Outdoor Vertical Venting ................................................................................................ 27
Figure 3.0.0 Example of Multiple Furnace Supply Gas Piping ............................................................. 28
Figure 5.0.0 Ductwork Configuration Example A ................................................................................ 30
Figure 5.0.1 Ductwork Configuration Example B ................................................................................ 30
Figure 5.0.2 Ductwork Configuration Example C ................................................................................ 31
Figure 5.0.3 Ductwork Configuration Example D ................................................................................ 31
Figure 6.1.0 50-200 MBH Temperature and Pressure Chart ............................................................... 32
Figure 6.1.1 250-400 MBH Temperature and Pressure Chart .............................................................32
Figure 6.5.0 Dimensional Drawings of Duct Furnaces ........................................................................ 35
Figure 6.6.0 Example of Single Stage and Two-Stage Gas Train ......................................................... 36
Figure 6.6.1 Example of Modulated Gas Train .................................................................................... 36
Figure 6.7.0 Single Stage Gas Valves (typical) ................................................................................... 37
Figure 6.7.1 Two-Stage Gas Valves (typical) ...................................................................................... 37
Figure 6.7.2 Modulating Gas Valves (typical) ...................................................................................... 38
Figure 7.6.0 Installation Example ...................................................................................................... 49
Figure 7.7.0 Air Proving Switch ......................................................................................................... 50
Figure 7.7.1 Airflow Probe ................................................................................................................. 50
Figure 7.7.2 Auxiliary High Temperature Limit Switch ........................................................................50
Figure 7.8.0 Typical Data Label ......................................................................................................... 51
Figure 7.8.1 Typical Gas Supply Piping Connection ............................................................................ 51
Figure 7.9.0 Recommended Drain Trap Construction .......................................................................... 52
Figure 7.10.0 Electric Supply Fittings (typical) ................................................................................... 52
Figure 8.6.0 Burner Flame at 1.2 InWC Manifold ................................................................................ 55
Figure 8.6.1 Burner Flame at High Fire 3.5 InWC Manifold ................................................................. 55
Figure 9.3.0 Service Parts-Staged Control ........................................................................................ 57
Figure 9.3.1 Service Parts-Modulated Control ................................................................................... 57
Figure 10.2.0 Series 5 Ignition Controller .......................................................................................... 59
TABLE OF CONTENTS
TABLE OF WIRING SCHEMATICS
Figure 6.9.0 Control Wiring, 1 Stage Furnace ....................................................................................40
Figure 6.9.1 Control Wiring, 2 Stage Furnace .................................................................................... 41
Figure 6.9.2 Control Wiring, 5:1 Turndown Furnace, 50-175 MBH ......................................................42
Figure 6.9.3 Control Wiring, 5:1 Turndown Furnace, 200-400 MBH ....................................................43
Figure 6.9.4 Control Wiring, 10:1 Turndown Furnace, 200-250 MBH .................................................. 44
Figure 6.9.5 Control Wiring, 10:1 Turndown Furnace, 300-400 MBH .................................................. 45
Figure 6.9.6 Furnace Control Wiring Schematic-Analog .....................................................................46
Figure 6.9.7 Furnace Control Wiring Schematic-BMS.........................................................................46
Figure 6.9.8 Furnace Control Wiring Schematic-External Safety Interlocks ......................................... 47
Figure 6.9.9 Furnace Control Wiring Schematic-Staged Duct Thermostat ........................................... 47
131.800.627.4499
MODEL NUMBER
Duct Furnace Type
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
"GH" = Gas Furnace 50-400 MBH
DIGIT NUMBER
Digits 1 - 2:
Location
Digits 4 - 5:
"IN" = Indoor
"RT" = Rooftop
*NOTE:
Digits 3, 21, 24 & 25 are not used in this model.
All heaters come with standard features: Air Proving Switch, Auxiliary High Temperature Limit Switch
Descriptions of feature and options are found in the installation and operation manual.
Restrictions:
1: Control Type Code "V" & "W" not available with Input Capacity in MBH Codes "050", "075", "100", "125", "150" & "175".
2: System/Inducer Voltage Code "2" not available with Input Capacity in MBH Codes "050", "075", "100", "125" , "150", "175" & "200".
3. Power Fusing Code “F” only available with Disconnect Switch Code “D”. Power Fusing Code “F” always selected when Disconnect Switch Code “D” is selected.
-
Disconnect Switch
Digit 17:
"N" = None (Standard)
"D" = Disconnect Switch
Vent Location
Digits 6 - 7:
"SI" = Separated Top Indoor
"KI" = Top Exhaust Indoor
"WO" = Front Exhaust Outdoor
"NO" = Top Exhaust Outdoor
Input Capacity in MBH
Digits 8 - 10:
"050", "075", "100", "125", "150", "175", "200", "250", "300", "350", "400"
Fuel Type
Digit 11:
"N" = Natural Gas (Standard)
"P" = Propane
Tube Material
Digits 12 - 13:
"SS" = 409 Stainless Steel (Standard)
"CS" = 304 Stainless Steel
Airflow Orientation
Digit 14:
"H" = Horizontal
Thermal Efficiency
Digit 15:
"S" = 80%
Elevation
Digit 16:
"S" = 0 - 2000' (Standard)
"2" = 2001'- 3000'
"3" = 3001' - 4000'
"4" = 4001' - 5000'
"5" = 5001' - 6000'
"6" = 6001' - 7000'
"Y" = 7001' and above
System/Inducer Voltage (see Restriction 2)
Digit 18:
"1" = 115V
"2" = 208V
"3" = 230V
Phase
Digit 19:
"1" = Single Phase
Power Fusing (see Restriction 3)
Digit 20:
"N" = None
"F" = Fusing
---
Control Voltage
Digit 22:
"S" = 24VAC
Control Type (see Restriction 1)
Digit 23:
"T" = Two Stage High/Low with Thermostat (Standard)
"S" = Single Stage On/Off with Thermostat
"E" = Modulating 5:1 (Natural Gas)/3:1 (Propane) with Thermostat
"W" = Modulating 10:1 (Natural Gas)/6:1 (Propane) with Thermostat
"2" = Two Stage High/Low without Thermostat
"1" = Single Stage On/Off without Thermostat
"M" = Modulating 5:1 (Natural Gas)/3:1 (Propane) without Thermostat
"V" = Modulating 10:1 (Natural Gas)/6:1 (Propane) without Thermostat
CONFIGURATION CODE
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
INDIRECT GAS-FIRED DUCT FURNACE CONFIGURATION CODE
Each RenewAire Indirect Gas-Fired Duct furnace is assigned a 25 digit Model Number. The
Model Number can be used to identify the various options as ordered by the customer.
1.800.627.449914
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
DEFINITIONS FOR CONFIGURATION CODE
Heater Type:
GH—indirect gas-fired duct furnace from 50 MBH up to
400 MBH
Location:
IN—indoor duct furnace
RT—outdoor duct furnace
Vent Location:
Separate Inlet Exhaust Indoor—indoor furnace
combustion air vent connections are separately located on
top of the furnace.
Top Exhaust Indoor—indoor furnace combustion air
exhaust vent connection located on top of furnace.
Combustion air intake is through louvers on front panel of
furnace.
Front Exhaust Outdoor—outdoor furnace combustion
air hood openings located on front panel of furnace.
Combustion air intake through large hood on front panel
and combustion air exhaust through small hood on front
panel.
Top Exhaust Outdoor—outdoor furnace combustion
air exhaust vent stack located on top of the furnace.
Combustion air intake through large hood on front panel
of furnace.
Input Capacity:
MBH—BTU per hour (÷1000) rating for furnace input
capacity.
Input capacities are 50, 75, 100, 125, 150, 175, 200, 250,
300, 350, and 400.
Fuel Ty pe:
Natural Gas (Standard)—natural gas used in most
applications.
Propane (Option)—propane available.
Tube Material:
409 Stainless Steel (Standard)—provides excellent
corrosion resistance at elevated temperatures and is more
corrosion-resistant than aluminized steel.
304 Stainless Steel (Option)—higher chromium and nickel
content than 409 stainless steel with superb corrosion
resistance at elevated temperatures.
Airflow Orientation:
Horizontal—furnace installed where airflow in ductwork
is horizontal through the heater.
Thermal Efficiency:
80% Efficiency—standard thermal efficiency for gasfired duct furnace. Thermal efficiency is ratio of output
CONFIGURATION CODE
capacity to input capacity.
Elevation:
0-2000 feet (Standard)—furnace burner orifices for
operation up to 2000 ft. above sea level.
2001-6999 feet (Option)—furnace burner orifices for
operation 2001-6999 ft. above sea level.
Above 7000 feet (Option)—furnace burner orifices for
operation over 7000 ft. above sea level.
Disconnect Switch (Option):
Disconnect switch mounted on furnace to disconnect line
voltage to furnace.
System/Inducer Voltage:
Single Phase—115V, 208V, 230V
Voltage Phase:
Single Phase only.
Power Fusing (Option):
Fuse block and fuses installed to protect system and draft
inducer from over-amperage conditions.
Control Voltage:
24 VAC (Standard)—secondary voltage
Control Type:
Two Stage High/Low Fire (Standard)—furnace initiates
at 1st stage (low fire; 55% of full capacity). If additional
heat is required then 2nd stage initiates (high fire; 100%
capacity).
Can be ordered with 2-stage duct thermostat and sensor
(standard) or without the thermostat.
Single Stage On/Off—furnace is either on or off to meet
heat required.
Can be ordered with or without duct thermostat and
sensor.
Modulating 5:1 Turndown (3:1 turndown for propane)—
furnace operates from 20-100% of output capacity based
on 0-10Vdc input.
Can be ordered with or without electronic analog
thermostat and sensor.
Modulating 10:1 Turndown—(6:1 turndown for propane)
furnace operates from 10% - 100% of output capacity
based on 0-10 VDC input.
Can be ordered with or without electronic analog
thermostat and sensor.
151.800.627.4499
CONFIGURATION CODE
ACCESSORY
Air Proving Switch: (Standard)
Air proving switch included for duct mounting upstream
of the furnace. Prevents operation of the furnace in the
event of no/low air flow in the duct. Required by safety
certifying agencies.
Auxiliary High Temperature Limit Switch: (Standard)
Auxiliary high temperature limit switch included for duct
mounting downstream of the furnace. Prevents operation
of the furnace in the event of low air flow conditions
resulting in elevated temperatures. Required by safety
certifying agencies.
Automatic Reset Fixed Temperature High Limit Switch:
(Standard)
Automatic reset limit switch included for primary overtemperature protection. Required by safety certifying
agencies.
Combustion Air Pressure Switch: (Standard)
Combustion air pressure switch included to prove
sufficient air flow is present. Required by safety certifying
agencies.
GH-Series Indirect Gas-Fired Duct Furnace
Manual Reset Flame Rollout Switch: (Standard)
Manual reset flame rollout switch included to monitor
presence of burner flame. Required by safety certifying
agencies.
Direct Spark Ignition Control (Standard):
Direct spark ignition control monitors Call For Heat and
ensures draft inducer fan is operating before spark
commences and gas valve is energized for the ignition
period. Once burner ignites and cross light and flame is
detected, spark is shut off. During heating operation, the
thermostat, pressure switch and main burner flame is
constantly monitored for proper operation.
Terminal Block: (Standard)
High voltage terminal block and low voltage control
terminal block included.
1.800.627.449916
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
1.0 OVERVIEW
1.1 DESCRIPTION
The model GH indirect gas-fired duct furnace is available in two different series, one for indoor
installations and the other for outdoor installations. Indoor models are available with either
separate combustion whereby they draw combustion air directly from the outdoors, or they
may draw combustion air directly through an integral vent. Furnaces can be ordered in several
different BTU inputs and also a variety of control options. All furnaces produce a low pressure
drop and are provided with a galvanized steel cabinet. The temperature rise across each
furnace is 20-60˚F [11.2-33.3˚C]. These furnaces may be installed and used individually or they
may be installed to operate in conjunction with additional furnaces.
IMPORTANT
Furnace models that are designated for indoor installation should only be installed indoors.
Furnace models that are designated for outdoor installation should only be installed outdoors.
THESE FURNACES COMPLY WITH ANSI Z83.8 AND CSA 2.6M Gas-Fired Duct Furnace
1.2 GAS SUPPLY
RenewAire gas-fired duct furnaces can be ordered with either natural gas or LP gas as a fuel
source, not to exceed pressure of 13.5 inches water Column (InWC) [3,359 Pa]. For all furnaces:
u
Natural gas supply pressure must be a minimum of 5 InWC [1244 Pa] and a maximum of 13.5
InWC [3359 Pa].
u
LP gas supply pressure must be a minimum of 12 InWC [2986 Pa] and a maximum of 13.5
InWC [3359 Pa].
u
If gas pressure exceeds 13.5 InWC [3359 Pa], an additional regulating valve must be field-
supplied and installed.
OVERVIEW
NOTE: This unit is
an indriect gas-fired
duct furnace that
will be referred to in
this manual as a furnace.
NOTE: Within this
manual, U.S. units of
measure are given
first and then the
SI version is provided in
brackets [ ].
1.3 ELECTRICAL SUPPLY
The furnace control system requires both line voltage and low voltage circuits with correct
polarity and clean neutral and ground. Line voltage readings between L1 and Neutral as well as
L1 and Ground should be within +/- 3 volts of the voltage rating on the furnace data label, found
inside the removable door.
1.4 INPUT CAPACITY IN MBH
Gas furnace sizes are based upon the INPUT MBH (thousands of BTUs per hour [Watts]).
This is a measure of heat energy available and is not to be confused with heat output, which
is affected by the efficiency of the furnace. Furnaces are available in the following input
capacities:
u
50 MBH [14,653 W]
u
75 MBH [21,980 W]
u
100 MBH [29,307 W]
u
125 MBH [36,633 W]
u
150 MBH [49,960 W]
u
175 MBH [51,287 W]
u
200 MBH [58,614 W]
u
250 MBH [73,267 W]
u
300 MBH [87,921 W]
u
350 MBH [102,574 W]
u
400 MBH [117,228 W]
NOTE: All furnaces are 80% efficient.
IMPORTANT
The furnace sizes shown above are rated for installation at altitudes up to 2,000 feet [610m].
Starting at altitudes above 2,000 feet [610m] appliances should be de-rated 4% and another
4% for each 1,000 feet [305m] of elevation above 2,000 feet. For example:
2000-2999 ft 4% derate 4000-4999 ft 12% derate 6000-6999 ft 20% derate
3000-3999 ft 8% derate 5000-5999 ft 16% derate 7000 ft and above consult factory
171.800.627.4499
OVERVIEW
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
1.5 GAS FURNACE MODULATION (TURNDOWN)
Turndown is a gas furnace operating mode in which the input gas volume is reduced to provide
more consistent heating of the Occupied Space. Example: a 200 MBH input furnace is being
used to provide heat when ambient conditions call for only a small amount of added heat.
Rather than the furnace running at full output for a brief period, the gas supply is reduced in
order to provide a smaller heat output, which allows the furnace to run for a longer period,
improving hysteresis. Each modulation scheme requires that the gas train be designed for that
specific turndown scheme. Modulation of the gas supply typically involves a different gas valve
or valves, some upgrade to the controls and a different gas manifold. RenewAire furnaces are
available with the following options:
u
Single stage, simple ON/OFF (available for 50-400 MBH)
u
2 stage HIGH/LOW (available for 50-400 MBH)
u
5:1 Modulation [Natural Gas]; 3:1 Modulation [Propane] (available for 50-400 MBH)
u
10:1 Modulation [Natural Gas]; 6:1 Modulation [Propane] (available for 200-400 MBH)
Furnaces are often identified as being either “staged” or “modulated”. A staged furnace is one
that has either one or two predetermined stages of output. For 2-stage furnaces, a 2-stage
valve is used that requires a signal to engage a solenoid on the valve body. A modulated furnace
has a variable output, produced by a modulating valve. The modulating valve will produce a
constantly variable output dependent on a 0-10 volt signal sent to the valve.
Furnace turndown is expressed as a ratio of the maximum to minimum heat output. Example: A
furnace that can deliver as little as one tenth of its maximum rating is said to have a turndown
ratio of 10:1.
1-Stage Furnaces:
These are simple ON/OFF furnaces. There is no turndown.
2:1 Turndown Furnaces:
These are typically staged furnaces and have two different output levels.
The two different outputs are accomplished using a 2-stage gas valve.
5:1 Turndown Furnaces:
These furnaces have a modulated output, meaning that the heat output will vary from maximum
down to one fifth of maximum. The modulation is accomplished using a modulating valve and
special controls.
10:1 Turndown Furnaces:
These furnaces have a modulated output, meaning that the heat output will vary from maximum
down to one tenth of maximum. The modulation is accomplished using a modulating valve and
special controls.
1.800.627.449918
OVERVIEW
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
INDOOR SEPARATE INLET EXHAUST
FURNACE
VENT
LOCATION
MODEL IN-SI
RenewAire
Furnace
Model
1-Stage
(ON/OFF)
Available?
IN-S YES YES YES NO IN-S YES YES YES YES
IN-K YES YES YES NO IN-K YES YES YES YES
RT-WO YES YES YES NO RT-WO YES YES YES YES
RT-NO YES YES YES NO RT-NO YES YES YES YES
FURNACE
VENT
LOCATION
IN-S YES YES YES NO IN-S YES YES YES YES
IN-K YES YES YES NO IN-K YES YES YES YES
RT-WO YES YES YES NO RT-WO YES YES YES YES
RT-NO YES YES YES NO RT-NO YES YES YES YES
FURNACE
VENT
LOCATION
IN-S YES YES YES NO IN-S YES YES YES YES
IN-K YES YES YES NO IN-K YES YES YES YES
RT-WO YES YES YES NO RT-WO YES YES YES YES
RT-NO YES YES YES NO RT-NO YES YES YES YES
FURNACE
VENT
LOCATION
IN-S YES YES YES NO IN-S YES YES YES YES
IN-K YES YES YES NO IN-K YES YES YES YES
RT-WO YES YES YES NO RT-WO YES YES YES YES
RT-NO YES YES YES NO RT-NO YES YES YES YES
FURNACE
VENT
LOCATION
IN-S YES YES YES NO IN-S YES YES YES YES
IN-K YES YES YES NO IN-K YES YES YES YES
RT-WO YES YES YES NO RT-WO YES YES YES YES
RT-NO YES YES YES NO RT-NO YES YES YES YES
FURNACE
VENT
LOCATION
IN-S YES YES YES NO
IN-K YES YES YES NO
RT-WO YES YES YES NO
RT-NO YES YES YES NO
2-Stage
(High/Low)
Available?
INDOOR TOP EXHAUST
MODEL IN-KI
Modulating
(5:1 Turndown)
(10:1 Turndown)
Available?
Modulating
Available?
OUTDOOR FRONT EXHAUST
MODEL RT-WO
RenewAire
Furnace
Model
1-Stage
(ON/OFF)
Available?
2-Stage
(High/Low)
Available?
OUTDOOR TOP EXHAUST
Modulating
(5:1 Turndown)
Available?
GH-050 GH-200
GH-075 GH-250
GH-100 GH-300
GH-125 GH-350
GH-150 GH-400
GH-175
MODEL RT-NO
Modulating
(10:1 Turndown)
Available?
FIGURE 1.5.0 CHART OF AVAILABLE TURNDOWN OPTIONS BY FU RNACE MODEL
191.800.627.4499
OVERVIEW
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
See figures below for examples of common installation approaches.
FIGURE 1.5.1 TYPICAL INSTALLATION OF INDOOR SEPARATE INLET
EXHAUST FURNACE
FIGURE 1.5.2 TYPICAL INSTALL ATION OF INDOOR TOP EXHAUST F URNACE
FIGURE 1.5.3 TYPICAL INSTALLATION OF OUTDOOR TOP EXHAUST
FURNACE
HIGH- AND LOW-VOLTAGE
WIRING ENTRY FITTINGS
FIGURE 1.5.5 TYPICAL FACTORY-PROVIDED CONNECTION POINTS
FIGURE 1.5.4 TYPICAL PARALLEL FURNACE INSTALL ATION
3/4” GAS CONNECTION
CONDENSATE DRAIN
TUBE
1.800.627.449920
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
1.6 SINGLE AND MULTIPLE FURNACE CONFIGURATIONS
Furnaces may be installed individually or in parallel. ALL FURNACES MUST BE INSTALLED ON
THE POSITIVE PRESSURE SIDE OF THE FAN. Refer to the previous page for typical examples
of common installation approaches. The maximum allowable discharge temperature is 160˚F
[71˚C] for any installation. Maximum design duct static pressure is 3.0 InWC [746.5 Pa]. The
examples below show recommended single and multiple furnace configurations.
Note that the examples below are based upon a specific Entering Air temperature. As Entering
Air temperatures vary, the resulting temperature rise will also vary.
EXA MPLE 1 - SINGLE FURNACE
OVERVIEW
4939 CFM [2331 l/s]
45 ˚F [7.2 ˚C] Entering
Air Temp
9978 CFM [4662 l/s]
45˚F [7.2˚C] Entering
Air Temp
300,000 Btuh [87,921 W]
Input
45˚F [25 ˚C] Rise
Pressure Drop .22" WC [54 Pa]
FIGURE 1.6.0 SINGL E UNIT - TOP VIEW
EXA MPLE 2 - PARALLEL FURNACES
(KEEPS PRESSURE DROP (PD) LOW FOR L ARGE CFM)
300,000 Btuh [87,921 W]
Input
45˚F [25˚C] Rise
300,000 Btuh [87,921 W]
Input
45˚F [25˚C] Rise
Pressure Drop .22" WC [54 Pa]
Based on equal airflow of
4939 cfm [2331 l/s] through each section
90 ˚F [32.2 ˚C]
Discharge
Air Temp
90˚F [32.2˚C]
Discharge
Air Temp
FIGURE 1.6.1 PARALLEL UNIT - TOP VIEW
1.7 USER INTERFACE
The User Interface (U/I) is the device that the owner uses to control operation of the furnace.
Single and two-stage furnaces can be ordered with a 2-stage duct thermostat and sensor.
Modulating furnaces can be ordered with an analog thermostat and sensor. The user interface
may be a simple ON/OFF switch, a thermostat or even a Building Management System (BMS).
211.800.627.4499
VENTING
ACCESSORY
NOTE: For assistance with vent
sizing and design,
contact a reputable
company such as Precision
Vent or Tjernlund.
GH-Series Indirect Gas-Fired Duct Furnace
2.0 VENTING
2.1 EQUIVALENT LENGTH
Vent pipe lengths are given as “equivalent lengths”. When vent pipes are installed, they often
require that an elbow(s) be installed as part of the vent pipe. Elbows restrict free flow of gases
through the vent pipe. A 90˚ elbow added to a straight run of vent pipe is the equivalent of
adding 5 feet [1.5m] of length to the vent and adding a 45˚ elbow is the equivalent of adding 2.5
feet [0.75m] in length.
Example: A horizontal vent is 6.5 feet [2m] long, but it has a 45 degree elbow in the middle. Its
equivalent length is therefore 9 feet [2.75m] (6.5' + 2.5') [2.0m + 0.75m]. If this horizontal run
of venting were being used in conjunction with a vertical run of venting, the minimum length of
the vertical run must be 12 feet [3.66m] (horizontal equivalent length < 75% of vertical length).
2.2 INDOOR FURNACE VENTING
All duct furnaces must be connected to a venting system to convey flue gases outside of the
building.
Vent systems must be sized and installed in accordance with ANSI Z223.1 (NFPA 54) or in
Canada CAN/CGA-B149. There are three acceptable methods for venting indoor furnace
installations:
u
Vertical Indoor venting-uses building air for combustion, vent pipe run outdoors through
single roof penetration.
u
Horizontal Indoor venting-uses building air for combustion, vent pipe run outdoors through
single wall penetration
u
Separate Combustion 2-Pipe venting-uses outside air for combustion, vents outdoors–two
roof or wall penetrations.
1.800.627.449922
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
VERTICALLY VENTED DUCT FURNACES
Proper venting of the duct furnace is the responsibility of the installer. Vent piping is supplied by
others. When operated with the venting system in place, proper duct furnace operation must be
verified, including flue gas analysis of each connected furnace.
1. Use single wall or double wall (Type B) vent pipe of diameters shown below:
INPUT RATING (Btuh) INPUT RATING (W) VENT PIPE DIA.
50,000 − 199,999
200,000 − 400,000
2. Maximize the height of the vertical run of vent pipe. A minimum of five (5) feet [1.5m] of
vertical pipe is required. The top of the vent pipe must extend at least two (2) feet [0.61m]
above the highest point on the roof. (Use Listed Type B vent for external runs).
3. An approved weatherproof vent cap must be installed to the vent termination.
4. Horizontal runs must not exceed 75% of the vertical height of the vent pipe, up to a maximum
of ten (10) feet [3m]. Horizontal runs should be pitched downward ¼" per foot [21mm/m] and
should be supported at 3 foot [1m] maximum intervals.
5. Design vent pipe runs to minimize the use of elbows. Each 90˚ elbow is equivalent to 5 feet
[1.5m] of straight vent pipe run.
6. Vent pipe should not be run through unheated spaces. If such runs cannot be avoided,
insulate vent pipe to prevent condensation inside vent pipe. Insulation should be a minimum
of ½" [12.7mm] thick, foil faced material suitable for temperatures up to 500˚F [260˚C]
7. Dampers must not be used in vent piping runs. Spillage of flue gases into the occupied space
could result.
8. Vent connectors serving Category 1 heaters must not be connected into any portion of a
mechanical draft system operating under positive pressure.
14,653 − 58,614
58,615 − 117,228
5 in. [12.7cm]
6 in. [15.25cm]
VENTING
Roof Deck
Listed Vertical
Vent Terminal(s)
Use insulated
Vent Outdoors
10 ft. (3.05m) Max.
(Not to exceed 75%
Vertical Flue Height)
FIGURE 2.2.0 INDOOR VERTICAL VENTING
2 ft Min.
(0.61m)
Condensate
Pitch pipe down 1/4in. (6mm)
pitch per 1 ft. (305mm)
horizontal run to allow for
condensate drainage
Drain
NOTE: For assistance with vent
sizing and design,
contact a reputable
company such as Precision
Vent or Tjernlund.
5 ft Min.
(1.52m)
NOTE: All installa-
tions must comply
with SMACNA
guidlines.
NOTE: All ductwork
and venting as
shown in illustra-
tions is supplied by
others and field installed.
231.800.627.4499
1.0 ft
(0.3m)
Min.
2 ft.
(0.6m)
Min.
18 in.
(0.45m)
Min. at CL
5 ft. (1.52m) Min.
25 ft (7.6m)
Max. Equiv. Length
3 ft. (0.9m)
Above grade
or expected
snow depth
Pitch pipes down 1/4in.
(6mm) pitch per 1 ft. (305mm)
horizontal run to allow for
condensate drainage
Exterior Wall
Listed Horizontal
Vent Terminal(s)
Exhaust Vent
Combustion Air
Inlet
VENTING
ACCESSORY
NOTE: A field-supplied and installed
power vent may be
required for vent
runs longer than 50 equivalent feet [15.25M].
GH-Series Indirect Gas-Fired Duct Furnace
HORIZONTALLY VENTED DUCT FURNACES
Pressures in Category III venting systems are positive and therefore care must be taken to avoid
flue products from entering the heated space. Use only vent materials and components that are
UL listed and approved for Category III venting systems.
All vent pipe joints must be sealed to prevent leakage into the heated space. Follow instruction
provided with approved venting materials used. The proper vent pipe diameter must be used, to
insure proper venting of combustion products.
The total equivalent length of vent pipe must not exceed 50 ft. [15.25m]. Equivalent length is
the total length of straight sections, plus 5 ft. [1.52m] for each 90˚ elbow and 2.5 ft [0.76m] for
each 45˚ elbow.
The vent system must also be installed to prevent collection of condensate. Pitch horizontal
pipe runs downward ¼ in. per foot [21mm/m] toward the outlet to permit condensate drainage.
Insulate vent pipe exposed to cold air or routed through unheated areas. Insulate vent pipe
runs longer than 10 ft. [3m]. Insulation should be a minimum of ½ in. [12mm] thick foil faced
material suitable for temperatures up to 500˚F [260˚C]. Maintain 6 in. [152mm] clearance
between vent pipe and combustible materials.
A vent cap listed for horizontal venting must be provided. Vent cap inlet diameter must be same
as the required vent pipe diameter. The vent terminal must be at least 12 in. [305mm] from the
exterior wall that it passes through to prevent degradation of building material by flue gases.
The vent terminal must be located at least 1 ft. [305mm] above grade, or in snow areas, at least
3 ft. [1m] above snow line to prevent blockage. Additionally, the vent terminal must be installed
with a minimum horizontal clearance of 4 ft. [1.2m] from electric meters, gas meters, regulators
or relief equipment.
company such as Precision
Vent or Tjernlund.
others and field installed.
NOTE: For assistance with vent
sizing and design,
contact a reputable
NOTE: All installations must comply
with SMACNA
guidelines.
NOTE: All ductwork
and venting as
shown in illustrations is supplied by
FIGURE 2.2.1 INDOOR HORIZONTAL VENTING
1.800.627.449924
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
EACH DUCT FURNACE MUST HAVE ITS OWN INDIVIDUAL VENT PIPE AND TERMINAL. Do not
connect vent system from horizontally vented units to other vent systems or a chimney.
Through the wall vents shall not terminate over public walkways, or over an area where
condensate or vapor could create a nuisance or hazard.
TWO-PIPE SEPARATE COMBUSTION SYSTEMS
The furnace must be mounted with the burner section in a reasonably airtight vestibule
compartment, as these systems provide combustion air from outside the heated space and vent
the products of combustion outdoors. Additionally the heating unit must include the following:
1. A tooled door latch to ensure that door or panel is closed or in place during operation.
2. Approved vent terminals on both the supply air inlet and flue gas exhaust. NOTE: The inlet
and outlet terminals must be located in the same pressure zone to provide for safe appliance
operation.
3. For combustion air piping, use 24 gauge galvanized steel single wall pipe. Tape joints with
aluminum foil tape and secure with corrosion resistant screws.
4. Inlet air pipe must be same size as exhaust vent pipe based on input ratings.
5. For exhaust venting, use 24 gauge galvanized single wall or Type B vent for vertically vented
furnaces.
6. For exhaust venting, use only vent materials and components that are UL listed and approved
for Category III vent systems when venting horizontally.
7. Exhaust and vent piping must not exceed a combined 50 equivalent feet [15.25m].
Proper installation of air inlet and flue gas exhaust piping are essential to proper operation of
the duct furnace.
Separate combustion systems may not be common vented. Each furnace must have its own
individual air supply and flue gas exhaust vent.
VENTING
251.800.627.4499
VENTING
ACCESSORY
NOTE: For assistance with vent
sizing and design,
contact a reputable
company such as Precision
Vent or Tjernlund.
NOTE: All installa-
tions must comply
with SMACNA
guidelines.
NOTE: All ductwork
and venting as
shown in illustra-
tions is supplied by
others and field installed.
GH-Series Indirect Gas-Fired Duct Furnace
6 ft.
(1.8m)
Min.
To Wall or
Adjoining Building
2.5 ft
(0.75m)
Min.
18 in.
Roof Deck
(0.3m)
Min.
Listed Vertical
Vent Terminal(s)
Exhaust Vent
Combustion Air
Inlet
Tee Fitting with
Drip Leg and
Cleanout Cap
(Both Pipes)
18 in.
(0.46m)
Min.
Note: Provide sufficient
clearance (height) to exceed
expected snow depth.
FIGURE 2.2.2 VERTICAL VENTING - SEPARATE COMBUSTION
5 ft. (1.52m) Min.
25 ft (7.6m)
Pitch pipes down 1/4in.
(6mm) pitch per 1 ft. (305mm)
horizontal run to allow for
condensate drainage
18 in.
(0.45m)
Min. at CL
Max. Equiv. Length
2 ft.
(0.6m)
Min.
1.0 ft
(0.3m)
Min.
Exhaust Vent
Exterior Wall
Combustion Air
Inlet
Listed Horizontal
Vent Terminal(s)
3 ft. (0.9m)
Above grade
or expected
snow depth
FIGURE 2.2.3 HORIZONTAL VENTING - SEPARATE COMBUSTION
NOTE: BE SURE THE VENT CAP USED FOR HORIZONTAL VENTING APPLICATIONS IS APPROVED
FOR HORIZONTAL APPLICATION. CERTAIN MANUFACTURERS’ VENT TERMINALS ARE
APPROVED FOR VERTICAL INSTALLATION ONLY.
1.800.627.449926
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
Combustion Air Opening
Equipment Pad
Roof Deck or
Listed Vent Terminal
12 in. Min.
48 in. Min.
required in some
jurisdictions
2.3 OUTDOOR FURNACE VENTING
Outdoor furnaces must be individually vented.
The venting system is designed for direct discharge of flue gases to the outdoors. The vent
discharge opening should be located to provide an unobstructed discharge to the outside and
should be located as far from the combustion air as possible, but in the same pressure zone.
Vent duct should pitch down toward outlet, to ensure that any condensate that occurs in the
vent duct drains away from the combustion blower fan housing. The duct opening should be
protected by a 1/2" x 1/2" screen. A fan hood is used over the discharge opening to prevent
wind-driven rain from entering the vent duct, but should not intersect the flue gas discharge
path.
Where sufficient clearance for proper horizontal venting cannot be provided, or in jurisdictions
requiring a 4 foot [1.2m] separation between the flue gas discharge and combustion air inlet,
flue gases should be vented vertically. Refer to illustration below for suitable venting method. A
vent adapter is required to transition from the rectangular ID fan discharge to round vent pipe.
Joints in the vestibule must be sealed.
Vent pipe must terminate at least 1 foot [0.3m] above the cabinet. The vent must be located on
the same side of the furnace as the combustion air opening. Condensation in the vent pipe is
likely during furnace start-up cycle and provision for drainage must be provided in closed vent
piping.
VENTING
Combustion Air Opening
Roof Deck orCombustion Air Exhaust
Equipment Pad
FIGURE 2.3.0 OUTDOOR HORIZONTAL VENTING
FIGURE 2.3.1 OUTDOOR VERTICAL VENTING
271.800.627.4499
GAS SUPPLY
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
3.0 GAS SUPPLY
Installation of piping must conform with local building codes and ordinances, or, in the absence
of local codes, with ANSI Z223.1, the National Fuel Gas Code. In Canada, installation must be in
accordance with CAN/CGA-B149 for natural gas and B149.2 for propane units.
Gas piping must be sized for the total BTU input of all furnaces serviced by a single supply.
Be sure that gas regulators servicing more than one furnace have the proper pipe and internal
orifice size for the total input of all furnaces serviced by the regulator.
See table below for minimum inlet gas pressure required and maximum permissible supply
pressure at each furnace.
Natural Gas Propane Gas
Minimum (50 to 400 MBH models): 5.0 InWC 11.0 InWC
[14,653 to 117,228 W] [1244 Pa] [2737 Pa]
Maximum Inlet Pressure: 13.5 InWC 13.5 InWC
[3359 Pa] [3359 Pa]
Connect a fitting suitable for connection to a pressure gauge capable of measuring gas
pressure to 1/8” NPT tap provided on the inlet side of the gas valve or manual shut-off tapping.
Measure inlet pressure to each furnace serviced by a single regulator with all furnaces in
operation.
Gas supply piping to multiple furnaces should be configured to provide equal pressure to all
furnaces. With all furnaces operating at full output, minimum supply gas pressure should be
checked at all furnaces.
A drip leg (sediment trap) and a manual shut off valve must be provided immediately upstream
of the gas control on the heating unit. To facilitate servicing of the unit, installation of a union is
recommended.
All gas supply and furnace connections must be leak tested prior to placing equipment in
service.
FIGURE 3.0.0 EXAMPLE OF MULTIPLE FURNACE SUPPLY GAS PIPING
1.800.627.449928
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
4.0 PLACEMENT RECOMMENDATIONS
WARNING
RISK OF FIRE OR EXPLOSION!
Do not install duct furnace where it may be exposed to potentially explosive or flammable
vapors!
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any furnace. Do not install in potentially explosive atmosphere laden with dust, sawdust or
similar products.
CAUTION
RISK OF DAMAGE TO HEAT EXCHANGER AND PRODUCTION OF DANGEROUS GASES
Do not locate furnace in areas where corrosive vapors are present in the atmosphere or can
be mixed with combustion air entering the furnace. Airborne contaminants can cause corrosion and shorten the life of the heat exchanger and components. Chlorinated hydrocarbon
compounds (chlorine, hydrogen, and carbon), when exposed to high temperatures can cause
phosgene gases, which are hazardous.
PLACEMENT
All duct furnaces must be installed on the positive pressure side of the circulating blower.
Furnaces must be installed in a level, horizontal position. Verify that structural support is
adequate for the unit weight.
The heating section requires an ample supply of air for proper and safe combustion of the fuel
gas. Do not block or obstruct air openings to the area where the heating unit is installed. Locate
the unit to ensure an adequate supply of fresh air to replace air used in the combustion and
ventilation process.
Observe unit clearances as shown in Section 7.5.
5.0 DUCTWORK
Ductwork should be sized to fit the openings on the duct furnace. Uniform airflow distribution
over the heat exchanger is essential for proper operation and optimum unit efficiency. Use of
baffles and/or turning vanes may be required to provide uniform air flow through the heating
unit. See Ductwork Configuration drawings. Observe recommended spacing from circulated
air blower to heating unit. Locating the circulating air blower too close to the furnace creates
uneven airflow over the heat exchanger resulting in poor performance and possible damage to
heat exchanger from localized overheating.
Ductwork is to be fastened directly to the body of the furnace and then sealed, using Industry
Best Practices/SMACNA guidelines. Ductwork adjacent to the furnace (both upstream and
downstream) should have a removable service panel installed to allow inspection of the heat
exchanger tubes during annual maintenance.
291.800.627.4499
DUCTWORK
ACCESSORY
NOTE: All duct
installations must
comform to SMACNA
guidelines.
NOTE: All duct
layouts depicted
in this manual are
suggested and may
be modified to accomodate
field conditions.
GH-Series Indirect Gas-Fired Duct Furnace
GAS HEATER ERV
15° MAX
FRESH AIR
DUCT
24" MIN
TOP VIEW
GAS FURNACE
TOP EXHAUST OUTDOOR
(SHOWN)
REMOVABLE SERVICE PANEL
TURNING VANES
SHOWN
DUCT CURB
ACCESSORY
12" MIN
(PROVIDED BY OTHERS)
FIGURE 5.0.0 DUCTWORK CONFIGURATION EXAMPLE A
15° MAX
24" MIN
EQUIPMENT RAIL
FRONT VIEW
FIGURE 5.0.1 DUCTWORK CONFIGURATION EXAMPLE B
1.800.627.449930
TURNING VANES
SHOWN
REMOVABLE
SERVICE
PANEL
DUCTWORK
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
15° MAX 12" MIN
24" MIN
FRONT VIEW
FIGURE 5.0.2 DUCTWORK CONFIGURATION EXAMPLE C
REMOVABLE
SERVICE
PANEL
24"
24" MIN
MIN
15° MAX
TURNING VANES
SHOWN
FRONT VIEW
FIGURE 5.0.3 DUCTWORK CONFIGURATION EXAMPLE D
311.800.627.4499
0.32
60
PressureDrop(inch‐w.c.)
Airflow(CFM)
GasFurnace50‐ 200MBH
1.6
60
TemperatureRise(deg.F)
Airflow(CFM)
GasFurnace250‐ 400MBH
TECHNICAL DATA
ACCESSORY
55
50
45
40
35
TemperatureRise(deg.F)
30
25
GH-Series Indirect Gas-Fired Duct Furnace
6.0 COMPONENT TECHNICAL DATA
6.1 PERFORMANCE DATA
200
175
150
125
100
75
50
150
125
100
50/75
200
175
0.28
0.24
0.20
0.16
0.12
0.08
0.04
20
0 1000 2000 3000 4000 5000 6000 7000
FIGURE 6.1.0 50 - 200 MBH T EMPERATURE A ND PRESSURE CHART
55
50
45
400
350
40
300
35
250
250
30
25
400
350
300
0.00
1.4
1.2
1.0
0.8
0.6
PressureDrop(in.‐w.c.)
0.4
0.2
20
0.0
2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000
FIGURE 6.1.1 250 - 400 MBH TEMPER ATURE AND PRES SURE CHART
1.800.627.449932
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
6.2 FURNACE SIZE SELECTION
Furnace sizes are specified according to Input MBH. To select the correct furnace size, it is
necessary to determine the required heat output in BTU/Hr and then apply the efficiency rating
of the furnace to that output to determine the correct furnace size, measured in Input MBH.
The required heat output has to incorporporate a correct airflow, correct temperature rise and
acceptable pressure drop. The pressure drop can be determined by using the Temperature and
Pressure charts on the previous page.
The steps in sizing a furnace are:
Step 1: Calculate the required output using:
Output (Btu/Hr) = 1.08 x Airflow (cfm) x Temperature Rise (˚F)
Step 2: Convert the required output from Btu/Hr to MBH by using the results from Step 1:
Divide the required output in Btu/Hr (found in Step 1) by 1,000
Step 3: Calulate the minimum Input MBH:
Divide the output MBH (found in Step 2) by the furnace efficiency (80%)
Step 4: From the results of Step 3, select a furnace rated for the next input size larger than the
minimum required (found in Step 3).
TECHNICAL DATA
Example:
An installation requires an airflow rate of 3000 cfm and a temperature rise ∆T (˚F) of 30.
Step 1: Calculate required output in Btu/Hr using
Required output (Btu/Hr) = 1.08 x 3000 x 30 = 91,200 Btu/Hr
Step 2: Convert the required output from Btu/Hr to MBH by using the results from Step 1:
Required output (MBH) = 91,200/1000 = 91.2 MBH
Step 3: Calculate the required Input MBH using
Input MBH = 91.2/0.8 = 121.5 MBH
Step 4: Select a furnace rated for the next larger input size, which would be GH 125 (125 MBH).
Once a furnace has been selected, identify the correct furnace on the Temperature and
Pressure charts shown on the previous page. Each furnace is represented by two curved lines.
One curved line shows the temperature rise that the furnace produces at different airflow rates.
The temperature rise is greater when the airflow is less. The second curved line shows the
pressure drop at different airflow rates. The pressure drop increases as the airflow increases.
Example: A 125 MBH furnace as shown in the upper chart on the previous page is intended to
run at 3000 cfm. At 3000 cfm, the Temperature Rise line shows that there will be a temperature
rise of about 31˚F. The Pressure Drop line shows that at 3000 cfm, there will be a pressure
drop of 0.036 InWC.
331.800.627.4499
TECHNICAL DATA
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
6.3 MAXIMUM AND MINIMUM AIRFLOWS
For every duct furnace, there is a range of airflow that must be maintained in order to produce
an acceptable ∆T temperature rise and acceptable pressure drop. If the airflow is too low, the
resulting temperature rise will be too high. If the airflow is too high, the ∆T will be inadequate.
The temperature rise that should occur must be at least 20˚F and less than 60˚F.
To determine the minimum airflow in a furnace:
Minimum airflow (cfm) = furnace size (MBH) x 1000 x furnace efficiency (80%)/1.08 x 60 (˚F)
To determine the maximum airflow in a furnace:
Maximum airflow (cfm) = furnace size (MBH) X 1000 x furnace efficiency (80%)/1.08 x 20 (˚F)
6.4 DUCT FURNACE PRESSURE DROP
For every duct furnace, the airflow through the furnace encounters resistance and this produces
a drop in pressure between the inlet side and the exhaust side. The greater the airflow through
the furnace, the greater the pressure drop from one side of the furnace to the other.
To determine the pressure drop across a furnace, use the Temperature and Pressure charts
shown in section 6.1 of this manual. Find the airflow in cfm, shown at the bottom of each chart.
Follow the grid line up until it intersects with the Pressure Drop line for the desired furnace. Use
the example shown in Section 6.2 of this manual as an illustration.
1.800.627.449934
6.5 DIMENSIONED DRAWINGS
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
Weight -
Shipping
Installed
Weight -
TECHNICAL DATA
Vent Locations
IN-KI, IN-SI, RT-NO RT-WO
IN-KI, IN-SI, RT-NO, RT-WO
Air Flow @ Nom.
Duct Opening
5
22.921 34.921
6
IN-KI IN-SI RT-NO RT-WO
Rise
150,000 120,000 1852 5556 23.935 213 293
GH-150
20 60 47.847
175,000 140,000 2160 6481 26.685 233 313
(6)
GH-175
Temperature
Min. Max. Min. Max. "W" "L" "H" "H" "D"
Output Width Length Height Height Diameter
Rate
Model No.
Btuh Btuh °F °F cfm cfm inch inch inch inch inch lb lb
50,000 40,000 617 1852 15.685 127 207
75,000 60,000 926 2778 15.685 127 207
100,000 80,000 1235 3704 18.435 147 227
125,000 100,000 1543 4630 21.185 186 266
(3)
(3)
(4)
GH-050
GH-075
GH-100
(No. of Tubes)
(5)
GH-125
Input
FIGURE 6.5.0 DIMENSIONED DRAWINGS OF DUCT FURNACES
200,000 160,000 2469 7407 29.435 263 343
250,000 200,000 3086 9259 34.935 333 413
300,000 240,000 3704 11111 40.435 391 496
350,000 280,000 4321 12963 45.935 443 548
400,000 320,000 4938 14815 48.685 460 565
(7)
(8)
(10)
(12)
(14)
GH-200
GH-250
GH-300
GH-350
GH-400
(15)
351.800.627.4499
GAS TRAIN
ACCESSORY
NOTE: The gas train
is defined as the
structure that all
gases pass through,
going from the gas inlet
to the exhaust side of the
collector box.
GH-Series Indirect Gas-Fired Duct Furnace
6.6 GAS TRAIN SCHEMATICS
FIGURE 6.6.0 EXAMPLE OF SINGLE STAGE AND TWO-STAGE G AS TR AIN
FIGURE 6.6.1 EXAMPLE OF MODULATED GAS TRAIN
1.800.627.449936
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
6.7 GAS VALVE ILLUSTRATIONS
Photographs are typical of valves used. Actual valve models vary by installation.
ELECTRICAL CONNECTION
BLOCK
HONEYWELL 1-STAGE VALVE
GAS TRAIN
MANUAL SHUTOFF KNOB
GAS ADJUSTMENT SCREW
GAS ADJUSTMENT
SCREWS
GAS ADJUSTMENT
SCREWS
ELECTRICAL CONNECTION
MANUAL SHUTOFF
SWITCH
WHITE RODGERS 1-STAGE VALVE
FIGURE 6.7.0 SINGLE STAGE G AS VALVE S (TYPICA L)
ELECTRICAL CONNECTION
BLOCK
HONEYWELL 2-STAGE VALVE
ELECTRICAL CONNECTION
BLOCK
MANUAL SHUTOFF KNOB
1ST/2ND STAGE SOLENOID
GAS ADJUSTMENT SCREW
ELECTRICAL CONNECTION
MANUAL SHUTOFF
SWITCH
ELECTRICAL CONNECTIONS
WHITE RODGERS 2-STAGE VALVE
FIGURE 6.7.1 TWO-STAGE GAS VALVES ( TYPICAL)
371.800.627.4499
GAS TRAIN
ACCESSORY
LOW FIRE A DJUS TING SCREW
(UNDER PLASTIC CA P)
GH-Series Indirect Gas-Fired Duct Furnace
ELECTRICAL CONNECTIONS
MAXITROL M SERIES MODULATING VALVE
ELECTRICAL CONNECTION
BLOCK
MAXITROL EXA SERIES MODULATING VALVE
FIGURE 6.7.2 MODULATING GAS VALVES (TYPICAL)
BUTTON 2
(LOW FIRE)
BUTTON 1
(HIGH FIRE)
LED
DIP SWITCHES
1.800.627.449938
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
6.8 ELECTRICAL DATA
WARNING
RISK OF FIRE, ELECTRIC SHOCK OR INJURY
Before servicing or cleaning the furnace, switch power off at the disconnect switch or service
panel and lock-out/tag-out to prevent power from being switched on accidentally. More than
one disconnect switch may be required to de-energize the equipment for servicing.
Installation work and electrical wiring must be done by qualified professionals in accordance
with all applicable codes, standards, and licensing requirements.
Any structural alterations necessary for installation must comply with all applicable building,
health, and safety code requirements.
When cutting or drilling into wall or ceiling, do not damage electrical wiring and other hidden
utilities.
Use the furnace only in the manner intended by the manufacturer. If you have questions, contact
the manufacturer.
Electrical specifications are as shown in the chart below. Use conduit, strain reliefs, etc., as
required by code to secure the field wiring. Separate electrical wire entry fittings are provided
on the front of the unit for line voltage wires and low voltage control wires.
ELECTRICAL
Models
Input Voltage
115 VAC 2.4 2.4 2.4
230 VAC 1.5 1.5 1.5
Models
Input Voltage
115 VAC 4.0 4.0 4.0
208 VAC 2.5 2.5 2.5
230 VAC 2.4 2.4 2.4
GH 050, 075, 100, 125, 150, 175
Furnace FLA
Staged
GH 200, 250, 300, 350, 400
Staged
5:1
Modulating
Furnace FLA
5:1
Modulating
10:1
Modulating
10:1
Modulating
All furnaces are equipped with a Class II 24VAC power supply system that operates the furnace
internal controls.
IMPORTANT
Do not use the gas furnace transformer(s) to power external controls. Use the ERV low voltage 24 VAC transformer or an external supplied 24 VAC transformer.
IMPORTANT
If external controls are to be powered by the RenewAire ERV low voltage 24VAC transformer
or external supplied 24 VAC transformer then follow the requirements for those transformers
regarding wire length, wire gauge, and power draw.
391.800.627.4499
ELECTRICAL
ACCESSORY
BLK
1
IGNITION CONTROL
BLK
LINE
1/2
GH-Series Indirect Gas-Fired Duct Furnace
6.9 ELECTRICAL SCHEMATICS
NOTE: Furnace-specific wiring schematics are provided with each unit and can be found in the
document package shipped with the unit.
115 VAC
DRAFT INDUCER
IND
BLU
BLK
BLK
WHT
40VA
R
C
24V
YEL
WHT
2
3/4
WHT
BLU
BLU
BLU
Aux. High
limit
BLU
BLU
CAFS
3
BLU
5
CUSTOMER PROVIDED COMPONENT
BLU
GRY
ORG ORG
T' STAT
T1
24V
HI LIMIT
PUR
T2
PUR
PUR
T-Stat
Series 5 Ignition Control
YEL
GRY
Gnd
Syst.
MV
Alarm
BLU
Gnd
(V2)
ROLL OUT
SWITCH
ORG
APS
(PSW)
Sense
Spark
YEL
LO
2 STG GAS VALVE
HI
COM
WHT
ROR
ROLL OUT
SWITCH (2)
APS-1
AIR SWITCH -HI
YEL
YEL
SPARK
IGNITER
FLAME
SENSOR
ORG
YEL
4
YEL
CUSTOMER / FIELD WIRING
1
INTERNAL TERMINAL CONNECTION
EXTERNAL TERMINAL CONNECTION
3
(2)
nd ROLLOUT SWITCH ON HORIZONTAL BURNER TRAY ONLY
2
Note:
Safety interlocks provided. Wire in series
from Terminal 3 to T1 and remove factory
jumper.
Models: GH 050 - 400
FIGURE 6.9.0 CONTROL W IRING, 1 STAGE FURNACE
1.800.627.449940
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
NOTE: Furnace-specific wiring schematics are provided with each unit and can be found in the
document package shipped with the unit.
BLK
1
115 VAC
ELECTRICAL
WHT
2
BLK
1/2
3
LINE
BLU
BLU
IGNITION CONTROL
CAFS
BLU
IND
BLU
Aux. High
limit
BLU
BLU
BLU
BLU
GRY
DRAFT INDUCER
SPARK
IGNITER
FLAME
SENSOR
WHT
ORG
3/4
YEL
4
YEL
BLK
BLK
R
24V
T' STAT
T1
24V
PUR
T2
PUR
Series 5 Ignition Control
Gnd
Alarm
(V2)
MV
WHT
40VA
C
ORG ORG
HI LIMIT
PUR
T-Stat
Gnd
Syst.
YEL
APS
(PSW)
Sense
Spark
YEL
ROLL OUT
SWITCH
ORG
YEL
WHT
ROR
ROLL OUT
SWITCH (2)
APS-1
AIR SWITCH -HI
5
6
CUSTOMER PROVIDED COMPONENT
CUSTOMER / FIELD WIRING
1
INTERNAL TERMINAL CONNECTION
EXTERNAL TERMINAL CONNECTION
3
(2)
nd ROLLOUT SWITCH ON HORIZONTAL BURNER TRAY ONLY
2
BLU
GRY
LO
2 STG GAS VALVE
HI
Note:
Safety interlocks provided. Wire in series
from Terminal 3 to T1 and remove factory
jumper.
Models: GH 050 - 400
FIGURE 6.9.1 CONTROL WIRING, 2 STAGE FURNACE
COM
YEL
YEL
411.800.627.4499
ELECTRICAL
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
NOTE: Furnace-specific wiring schematics are provided with each unit and can be found in the
document package shipped with the unit.
BLK
L1 L2
Hot Neut
IGNITION CONTROL
BLK BLK
L1
IND
BLK
4
CR1
115 VAC
2
XFMR 1
WHT (Com)
BLK
RED
DRAFT INDUCER
HI
LO
WHT
40 VA
BLU
BLU
BLU
CAFS
AIR SWITCH -HI
APS-2
BLU
Aux. High
limit
BLU
BLU
BLU
GRY
BLU
YEL
24V
T' STAT
T1
BLU
24V
GRY
3
BLU
Series 5 Ignition Control
BLU
BLU
5
BLU
MV
Alarm
24V
YEL
COM
T1
Gnd
Syst.
Br/W
ORG
YEL
YEL
24V
T2
T3
HAPS
EST
T4
T5
R1
T6
T7
(-)
T8
E Valve
(+)
T9
1
BLU
Br/W
BLK
RED
(+) (-)(+) (-)
SIG
EXA
Valve
T2
HI LIMIT
PUR
PUR
T-Stat
Gnd
(V2)
YEL
C
BLU
M
Shunted
CR1
ORG
APS
(PSW)
Sense
Spark
36J22
Gas Valve
Maxitrol
SC40
J1
YEL
(+)
T11
(-)
T10
3
ROLL OUT
SWITCH
ROR
YEL
ORG
WHT
See Notes for Dip
Switch Setting
APS-1
0 – 10 VDC Analog Input
(Polarity Sensitive)
YEL
ROLL OUT
SWITCH (2)
AIR SWITCH -LO
FLAME
SENSOR
SPARK
IGNITER
WHT
YEL
4
ORG
1.800.627.449942
LEGEND
:
CUSTOMER PROVIDED COMPONENT
CUSTOMER / FIELD WIRING
1
INTERNAL TERMINAL CONNECTION
EXTERNAL TERMINAL CONNECTION
3
(2)
2
nd ROLLOUT SWITCH ON HORIZONTAL BURNER TRAY ONLY
Notes:
1.) Safety interlocks provided. Wire in
series from Terminal 3 to T1 and remove
factory jumper.
2.) Dip Switch setting for 0-10VDC Analog
Capable Controls – Series 5 Ignition Control
FIGURE 6.9.2 CONTROL WIRING, 5:1 TURNDOWN F URNACE, 50 - 175 MBH
ON
1 234
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
NOTE: Furnace-specific wiring schematics are provided with each unit and can be found in the
document package shipped with the unit.
ELECTRICAL
BLK
L1 L2
Hot Neut
BLK
IGNITION CONTROL
BLK BLK
L1
IND
BLK
115 VAC
BRN
XFMR 1
240T6T06 Controller
S1
BRN
WHT (Com)
SRTN
WHT
DRAFT INDUCER
WHT
LF
L
N
BLK
WHT
40 VA
BLU
BLU
BLU
GRY
3
CAFS
BLU
AIR SWITCH -HI
Aux. High
limit
BLU
T1
BLU
APS-2
BLU
T' STAT
GRY
BLU
YEL
24V
T2
24V
Series 5 Ignition Control
BLU
GRY
BLU
5
BLU
MV
Alarm
(+) (-)(+) (-)
SIG
EXA
PUR
24V
YEL
COM
T1
BLU
BRN
BRN
BLK
RED
Valve
HI LIMIT
PUR
T-Stat
Gnd
(V2)
YEL
24V
T2
HAPS
T3
EST
T4
T5
R1
T6
T7
(-)
T8
E Valve
(+)
T9
ORG ORG
Gnd
Syst.
YEL
BLU
LO
2 STG GAS VALVE
GRY
HI
APS
(PSW)
Sense
Spark
Maxitrol
J1
Open
ROLL OUT
SWITCH
ORG
COM
SC40
T11
T10
YEL
YEL
(+)
(-)
WHT
ROR
See Notes for Dip
Switch Setting
0 – 10 VDC Analog Input
(Polarity Sensitive)
YEL
ROLL OUT
SWITCH (2)
APS-1
AIR SWITCH -LO
SPARK
IGNITER
YEL
YEL
FLAME
SENSOR
YEL
4
ORG
LEGEND
:
CUSTOMER PROVIDED COMPONENT
CUSTOMER / FIELD WIRING
1
INTERNAL TERMINAL CONNECTIO N
EXTERNAL TERMINAL CONNECTION
3
(2)
nd ROLLOUT SWITCH ON HORIZONTAL BURNER TRAY ONLY
2
Notes:
1.) Safety interlocks provided. Wire in
series from Terminal 3 to T1 and remove
factory jumper.
2.) Dip Switch setting for 0-10VDC Analog
Capable Controls – Series 5 Ignition Control
FIGURE 6.9.3 CO NTROL WIRING, 5:1 TURNDOWN FURNACE, 20 0 - 400 MBH
ON
1234
431.800.627.4499
LEGEND
ELECTRICAL
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
NOTE: Furnace-specific wiring schematics are provided with each unit and can be found in the
document package shipped with the unit.
L1 L2
240T6T0 6
BLK
BLK
T2
BLU
3
IGNITION CONTROL
L1
BLU
BLK
IND
BLK
BLU
CAFS
Aux. High
limit
BLU
BLU
BLU
5
S1
T5 T6
SC30-SM2AN
BLU
115 VAC
L
F
SRTN
WHT
XFMR 1
24V
T1 T2
40 VA
R
C
T' STAT
PUR
Series 5 Ignition Control
T-Stat
24V
Alarm
MV
BLK
PUR
HI LIMIT (2)
(V2)
NL
Gnd
YEL
HI LIMIT (1)
PUR
ORG
Gnd
Syst.
7062-5903
DRAFT INDUCER
WHT (Com)
SENSE
SPARK
YEL
ORG
APS
WHT
YEL
ROLL OUT
SWITCH (A)
WHT
ROR
ORG
APS-1
(Low)
FLAME
SENSOR
SPARK
IGNITER
COM
WHT
4
YEL
Section ASection B
3
:
CUSTOMER PROVIDED COMPONENT
CUSTOMER / FIELD WIRING
1
INTERNAL TERMINAL CONNECTION
EXTERNAL TERMINAL CONNECTION
3
SC30-SM TERMINAL
T2
CONNECTION
BLU
GRY
BLU
BLU
APS-2
(Hi)
T1
M420
Mod
Valve
BLU
SC30-SM2AN
PUR/W
T9T8
BLU
5
RED/W
Models GH 200-250
Models: GH-200, 250
GRY
RED
BLK
PUR/W
T2
BLU
SC30-SM2AN
T11
T10
BLK
ORG
PUR
RED/W
T15
T14
o
r
i
t
x
Ma
S
-
0
3
C
S
T3
T4
XFMR 2
40VA
R
C
24V
Ignition Control (B)
L1
IND
Series 5 Ignition Control
T-Stat
24V
Alarm
MV
BLU
GRY
6
M
PUR/W
T8
T9
T10
l
T11
-
T13
+
T12
WHT (Com)
APS-3
ORG
Gnd
(V2)
YEL
M
36J54
2 STG GAS VALVE
HI
PUR/W
RED/W
RED/W
ORG
Syst.
YEL
C
Gnd
FIGURE 6.9.4 CONTROL WIRING, 10:1 TURNDOWN FURNACE, 200 - 250 MBH
YEL
36J22
Gas Valve
T1
T2
ORG
APS
SENSE
SPARK
YEL
C
Control Panel 2
5
6
BLK
RED
WHT
ROR
Control Panel 2
0 – 10 VDC Analog Input
(Polarity Sensitive)
FLAME
SENSOR
SPARK
IGNITER
M
YEL
ROLL OUT
SWITCH (B)
YEL
Note:
Safety interlocks provided. Wire in series
from Terminal 3 to T1 and remove factory
jumper.
Capable Controls – 5 Series Ignition Control
1.800.627.449944
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
NOTE: Furnace-specific wiring schematics are provided with each unit and can be found in the
document package shipped with the unit.
ELECTRICAL
L1 L2
BLK
BLK
L1
T2
BLU
3
3
LEGEND
:
CUSTOMER PROVIDED COMPONENT
CUSTOMER / FIELD WIRING
1
INTERNAL TERMINAL CONNECTION
EXTERNAL TERMINAL CONNECTION
3
SC30-SM TERMINAL
T2
CONNECTION
IGNITION CONTROL
IND
CAFS
BLU
GRY
BLU
5
BLU
APS-2
(Hi)
T1
BLK
BLU
BLU
PUR/W
BLU
240T6T0 6
S1
T5 T6
SC30-SM2AN
BLK
BLU
Aux. High
limit
BLU
BLU
GRY
BLU
PUR/W
T9T8
BLU
SC30-SM2AN
T10
RED
BLK
T2
T11
Mod
Valve
SC30-SM2AN
5
RED/W
Models: GH-300,350, 400
115 VAC
L
F
SRTN
XFMR 1
24V
R
C
T' STAT
T1 T2
PUR
Series 5 Ignition Control
T-Stat
24V
Alarm
MV
BLU
T15
T14
x
Ma
3
C
S
T3
T4
XFMR 2
BLK
R
C
24V
Ignition Control (B)
ORG
L1
PUR
T-Stat
24V
MV
BLU
RED/W
GRY
6
NL
BLK
WHT
40 VA
ORG
HI LIMIT (1)
PUR
Gnd
(V2)
ORG
PUR
Gnd
Syst.
YEL
GRY
PUR/W
T8
PUR/W
T9
T10
T11
T13
T12
APS-3
ORG
i
t
-
0
40VA
r
IND
o
S
HI LIMIT (2)
l
M
+
WHT (Com)
Series 5 Ignition Control
Gnd
(V2)
Alarm
YEL
YEL
36H54
MP
2 STG GAS VALVE
HI
7062-5903
DRAFT INDUCER
WHT (Com)
SENSE
SPARK
YEL
MP
2 STG GAS VALVE
HI
RED/W
RED/W
YEL
ROLL OUT
SWITCH (B)
Gnd
Syst.
YEL
YEL
C
WHT
WHT
ORG
APS
36H54
ORG
SENSE
SPARK
ROLL OUT
SWITCH (A)
T1
T2
YEL
WHT
ROR
C
Control Panel 2
BLK
RED
APS
YEL
ORG
ROR
APS-1
(Low)
5
6
WHT
YEL
Control Panel 2
FLAME
SENSOR
0 – 10 VDC Analog Input
(Polarity Sensitive)
SPARK
IGNITER
FLAME
SENSOR
SPARK
IGNITER
COM
4
YEL
Note:
Safety interlocks provided. Wire in series
from Terminal 3 to T1 and remove factory
jumper.
Capable Controls – 5 Series Ignition Control
Section ASection B
FIGURE 6.9.5 CONTROL WIRING, 10:1 TURNDOWN FURNACE, 300 - 400 MBH
451.800.627.4499
ELECTRICAL
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
ANALOG 0-10Vdc DUCT THERMOSTAT
WITH EXTERNAL SAFETY INTERLOCKS
FOR MODULATING FURNACE
SENSOR A
T
T
MOD 1
W +
Vdc
R -
OUTPUT
B
OUTPUT
RELAY 1
NO
24VAC
120/
240VAC
C
NC
AUX HIGH TEMP.
EXTERNAL POWER
SOURCE REQUIRED.
A SEPARATE EARTH
GROUND IS
REQUIRED FOR ANY
POWER SOURCE
(24,120, OR 240VAC)
C
+
120
COM
240
LIMIT SWITCH
SENSOR A
NO
COM
NC
AIR PROVING
SWITCH
0-10Vdc Analog Input
Polarity Sensitive
REMOVE
FACTORY
JUMPER
(+)
Maxitrol Signal
(-)
Conditioner
T1
T2
3
4
5
6
FIGURE 6.9.6 FURNACE CONTROL WIRING SCHEMATIC - ANALOG
BMS CONTROL WITH EXTERNAL SAFETY
INTERLOCKS FOR MODULATING FURNACE
BMS 0-10Vdc
OUTPUT
(+)
(-)
HEAT ENABLE
0-10Vdc Analog Input
Polarity Sensitive
(+)
Maxitrol Signal
(-)
Conditioner
NO
NC
COM
REMOVE
FACTORY
JUMPER
T1
T2
3
4
5
6
AUX HIGH TEMP.
LIMIT SWITCH
AIR PROVING
SWITCH
FIGURE 6.9.7 FURNACE CONTROL WIRING SCHEMATIC - BMS
1.800.627.449946
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
FIELD WIRING FOR EXTERNAL SAFETY
INTERLOCKS STAGED FURNACES
REMOVE
FACTORY
JUMPER
T1
T2
NO
COM
NC
ELECTRICAL
3
4
5
6
AUX HIGH TEMP.
LIMIT SWITCH
FIGURE 6.9.8 FURNACE CONTROL WIRING SCHEMATIC - EXTERNAL SAFETY INTERLOCKS
AIR PROVING
SWITCH
STAGED DUCT THERMOSTAT
2-STAGE
HEATING
21
R
B
R
B
T1
T2
1-STAGE
HEATING
21
R
B
R
B
T1
T2
3
4
5
6
FIGURE 6.9.9 FURNACE CONTROL WIRING SCHEMATIC - STAGED DUCT THERMOSTAT
471.800.627.4499
INSTALLATION
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
7.0 FURNACE INSTALLATION
7.1 FURNACE INSPECTION ON ARRIVAL
This furnace was test operated and inspected at the factory prior to shipment and was
in satisfactory working order. A copy of the test and inspection sheet is included in the
documentation package provided. Inspect the packaging on delivery for any signs of damage.
Report any damage immediately to the transporting agency. After uncrating, inspect furnace for
any concealed damage.
7.2 PREPARING FOR INSTALLATION
The type of gas for which the furnace is equipped, the input rating and electrical ratings are
shown on the unit data plate, to be found inside the removable door. Before installation, be sure
that the available gas and electrical supply match the data plate information.
Read this manual in its entirety before beginning installation. Check with local gas utility or
agencies having jurisdiction to determine if there are local requirements covering installation of
duct furnaces.
7.3 INSTALLATION CODES
The duct furnace covered in this manual is design certified by Intertek Testing Services/ETL for
commercial or industrial use in the United States and Canada.
These units must be installed in accordance with local building codes, the National Fuel
Gas Code (NFPA54/ANSI Z223.1 or in Canada, with the Canadian Natural Gas and Propane
Installation Code (CSA B149.1)
7.4 PLACEMENT OF FURNACE
The indoor duct furnace is designed for installation indoors. The outdoor duct furnace is
designed for installation outdoors on a roof or other outside location. Select a location that
is central to the inside duct runs and close to the ERV or other air handler that might be part
of the system. The duct furnace must be installed with horizontal airflow. The contractor is
responsible for safe installation of the furnace.
CAUTION
It is the installer’s responsibility to make sure the screws or bolts used for securing the
furnace are properly selected for the loads and substrates involved. Secure the furnace so
that it cannot fall or tip in the event of accident, structural failure or earthquake. RenewAire
strongly recommends outdoor units are secured properly to the building structure.
Strong winds, tornados and hurricanes can and do displace or remove equipment from curbs
and rails. When this happens, the equipment, adjacent roof structure and even the cars
parked near the building can be damaged, and rain typically enters the building. The equipment is put out of service and the collateral damage can be very expensive.
Provide service access to the furnace to allow for cleaning and inspections.
IMPORTANT
Provide adequate service access for maintenance. The furnace requires regular inspections.
Install the furnace where the access panels can be removed for cleaning and inspection and
wiring can be accessed for installation and service. Observe all safety precautions when
working on roofs, including locating the unit away from roof edges, provision of safety railings and use of fall-protection equipment.
There are U-channels at the base of the furnace for lifting the unit. Spreader bars are
recommended to avoid damage to the unit. Do not allow lifting cables to contact the furnace
sheet metal enclosure.
The U-channels can be used for floor-mounted installations. These channels provide the
required minimum clearance to combustible floor surfaces. DO NOT remove the channels
attached to the base of the cabinet.
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GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
7.5 CLEARANCE TO COMBUSTIBLES AND SERVICE CLEARANCES
Units must be located to provide the following clearances to combustible materials:
u
Sides and back: 6 inches
u
Bottom: 2 inches
u
Top: 36 inches
u
Front: 36 inches
7.6 FURNACE INSTALLATION REQUIREMENTS
The duct furnace must be installed on the positive pressure side of the ERV or field-supplied
circulating air blower. The air throughput must be within the CFM range marked on the furnace
rating plate.
Ductwork should be mechanically fastened to the furnace. Joints should be sealed with high
temperature silicone caulking or high temperature tape to prevent leakage of circulating air. All
outdoor furnace duct connections must be weathertight to prevent rain and snow from entering
the ductwork. Support all ductwork securely. DO NOT rely solely on furnace duct connections
for support. Provide removable access panels in ductwork immediately upstream and
downstream of the duct furnace to allow for inspection of the heat exchanger. These openings
should be large enough to observe smoke or reflected light inside the casing to inspect the heat
exchanger for leaks and to check for hot spots on the heat exchanger due to poor air distribution
or insufficient air volume. Attach covers so as to prevent air leakage. See figure below.
INSTALLATION
Access Panel
in duct
6"
6"
3"
Air Flow Proving
Auxiliary High
Temperature Limit
Switch
FIGURE 7.6.0 INSTALLATION EXAMPLE
Switch Probe
491.800.627.4499
INSTALLATION
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
7.7 INSTALL CONTROL SENSORS
All required control sensors are shipped loose with the unit. Each control device has a separate
installation instruction sheet that is included in the documentation package.
Each furnace comes equipped with an air proving switch and airflow probe that are to be fieldinstalled. The air proving switch requires some static pressure, approximately 0.2 InWC in the
duct to prove air flow. Install the proving switch probe 3 inches upstream of the furnace, in the
side of the duct. Mount the air proving pressure switch vertically on a non-vibrating surface
within a short distance from the probe. Connect the tubing from the probe to the proving switch.
Wire the air proving switch as shown in the wiring schematics.
FIGURE 7.7.0 AIR PROVING SWITCH
FIGURE 7.7.1 AIRFLOW PROBE
Each furnace comes equipped with an auxiliary high temperature limit switch that is to be fieldinstalled. Install the auxiliary high temperature limit switch 6 inches downstream of the furnace
in the side of the duct. Wire the auxiliary high temperature limit switch as shown in the wiring
schematics.
FIGURE 7.7.2 AUXILIARY HIGH TEMPERATURE LIMIT SWITCH
7.8 INSTALL GAS SUPPLY PIPING
7.8.1 Installation of Gas Piping
WARNING
All components of this or any other gas-fired heating unit must be leak-tested prior to placing the unit into operation. A soap and water solution or other non-corrosive leak detection
fluid should be used to perform this test. NEVER test for gas leaks with an open flame.
WARNING
When leak testing at pressures equal to or less than 14 inches WC [3.5 kPa], first close the
field-installed shutoff valve to isolate the unit from the gas supply.
IMPORTANT
All gas piping must be installed in accordance with the latest edition of the National Fuel Gas
Code, ANSI Z223.1 and any local codes that may apply. In Canada, the equipment shall be
installed in accordance with the Installation Code for Gas Burning Appliances and Equipment, (CGAB 149) and Provincial Regulations for the class. Authorities having jurisdiction
should be consulted before installations are made.
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GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
IMPORTANT
All piping should be clean and free of any foreign material. Foreign material entering the gas
train can cause damage.
IMPORTANT
DO NOT connect the furnace to gas types other than what is specified and DO NOT connect
the unit to gas pressures that are outside the pressure range shown on the unit label.
IMPORTANT
Before applying gas to the valves, test the gas pressure to make sure it is less than 13.5
InWC. Pressures greater than 13.5 inches WC will damage the gas valves.
NOTE
When connecting the gas supply, the length of the run must be considered in determining the
pipe size to avoid excessive pressure drop. Refer to a Gas Engineer’s handbook for gas pipe
capacities.
INSTALLATION
NOTE
Each furnace has a single 3/4 inch gas connection.
7.8.2 Determin Gas Supply Requirements
The data sticker located inside the removable door on the furnace lists the requirements for the
gas being supplied to the unit.
TYPE O F GAS
REQUIRED
Ground
Joint
Union
Gas Cock
From Gas Supply
Bleeder Valve or
1/8 in Plugged Tap
8 in. Trap
MINIMUM PRESSURE
REQUIRED
Gas to
Controls
FIGURE 7.8.0 TYPICAL DATA LABEL
FIGURE 7.8.1 TYPICAL GAS SUPPLY PIPING CONNECTION
A manual shut-off valve (gas cock), a 1/8 inch plugged test port or bleeder valve and a drip leg
must be field-installed between the gas supply pipe and the start of the gas train. The valve and
test port must be accessible for the connection of a test gauge. Supply gas connections must
be made by a qualified installer and are to be provided by others.
511.800.627.4499
INSTALLATION
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
Connect gas supply piping to the 3/4" MPT gas fitting on the front of the furnace. Follow all
local codes, or, in the absence of any local codes, comply with ANSI Z223.1.
7.9 CONNECT CONDENSATE DRAIN
Each ducted gas furnace is equipped with a 3/8 inch diameter stainless steel condensate drain
tube that extends from the front of the furnace. The condensate drain tube is under negative
pressure and must be trapped. The trap is to be provided by others and field-installed. The trap
should be fabricated in accordance with local building codes. It should allow for easy cleaning
and easy addition of a glycol solution, if needed for winterization. In addition, attention should
be given to the possible need for heat tapes. If heat tapes are to be used, it may be necessary
to fabricate the trap and other drain piping from metal.
The drain trap should be filled with water or glycol solution prior to furnace start-up.
PLUG
TEE FITTING
2.00
STAINLESS STEEL
TRAP LINE
4.00
FIGURE 7.9.0 RECOMMENDED DRAIN TRAP CONSTRUCTION
7.10 MAKE ELECTRICAL CONNECTIONS
Both high voltage supply and low voltage control wiring should be installed and connected
at this time. High voltage wiring and low voltage wiring should be run in separate conduits.
Use the factory-supplied electric fittings on the front of the furnace cabinet for entry into the
furnace. See figure below.
FIGURE 7.10.0 ELECTRIC SUPPLY FITTINGS (TYPICAL)
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GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
8.0 OPERATING INSTRUCTIONS
A wiring diagram and a Sequence of Operation are provided in the unit information package
for each specific control system provided on the duct furnace. Refer to the documents before
attempting to place the unit in service.
u
This duct furnace does not have a pilot light. It is equipped with a direct spark ignition device
that automatically lights the gas burner. DO NOT try to light burners by hand.
u
BEFORE OPERATING, leak test all gas piping up to the heater valve. Smell around the unit
area for gas. DO NOT attempt to place the unit in operation until source of gas leak is
identified and corrected.
u
Use only hand force to push and turn the gas control knob to the “ON” position. NEVER use
tools. If knob does not operate by hand, replace gas valve prior to starting the unit. Forcing or
attempting to repair the gas valve may result in fire or explosion.
u
Do not attempt to operate the furnace if there is indication that any part or control has been
under water. Any control or component that has been under water must be replaced prior to
trying to start the furnace.
8.1 START-UP
u
Turn thermostat or temperature controller to its lowest setting.
u
Turn off gas supply at the manual shut-off valve.
u
Turn off power to the furnace at the disconnect switch.
u
Remove access panel to furnace.
u
Move gas control knob to “OFF” position.
u
Install a tapped fitting for attachment to a manometer or other gauge suitable for 14 InWC in
the inlet pressure tap, and for 10 InWC in the manifold pressure tap.
u
Wait five minutes for any gas to clear out. If you smell gas, see above and correct leak. If you
don’t smell gas or have corrected any leaks, go to the next step.
u
Turn gas control knob to “ON” position. Open all manual gas valves.
u
Turn power “ON” at disconnect switch.
u
Set thermostat or controller to its highest position to initiate call for heat and maintain
operation of unit.*
u
Draft inducer fan will run for a 15 to 30 second pre-purge period. (See Sequence of
Operations provided.)
u
At the end of the pre-purge, the direct spark will be energized and gas valve will open.
u
Burners ignite.
* NOTE: If modulating controls are provided on the duct furnace, refer to separate set-up sheet
8.2 INLET GAS PRESSURE
Verify inlet (line) pressure to the combination valve provided. A 1/8 inch NPT tapping is provided
on the gas valve for measuring inlet pressure as shown.
8.3 INPUT
The correct heat capacity of the furnace is controlled by the burner orifices and the gas manifold
pressure. The manifold pressure is factory-set but should be checked at time of start-up.
8.4 MANIFOLD PRESSURE ADJUSTMENT
A pressure tap is provided in each furnace manifold for measuring the gas manifold pressure.
Manifold pressure must be checked at start-up and during any service or maintenance. All
control systems operate at a manifold pressure of 3.40 to 3.50 InWC at maximum input on
natural gas, and 10 InWC on propane gas.
START-UP
NOTE: Start-Up
is defined as the
process of activat-
ing each system
within a newly-installed
furnace after it has been
properly installed in the
system in which it is
expected to operate. A full
and proper start-up cannot
be performed unless the
Occupied Space with all
its associated ductwork,
controls and design options
are completed, intact, and
ready for full-load testing.
531.800.627.4499
START-UP
ACCESSORY
GH-Series Indirect Gas-Fired Duct Furnace
8.5 FAILURE TO IGNITE
On the initial start-up, or after the unit has been off for long periods of time, the first ignition
trial may be unsuccessful due to need to purge air from the manifold at start-up.
If ignition does not occur on the first trial, the gas and spark are shut off by the ignition control
and the control then enters an inter-purge period of 15 to 90 seconds, during which time the
draft inducer continues to run. At the end of the inter-purge period, another trial for ignition will
be initiated.
Control will initiate up to three ignition trials on a call for heat before lockout of control occurs.
Control can be brought out of lockout by turning thermostat or controller to its lowest position
and waiting 5 seconds and then turning it back up to call for heat. Some controls provided will
automatically reset after one hour and initiate a call for heat.
8.6 UNIT START-UP ADJUSTMENTS
8.6.1 Burner Flames
Prior to completing the start-up, check the appearance of the main burner flame. See images
below for characteristics of properly adjusted Natural Gas systems.
The burner flame should be predominantly blue in color and well defined and centered at the
tube entry. Distorted flame or yellow tipping of natural gas flame, or a long yellow flame on
propane, may be caused by lint and dirt accumulations inside burner or at burner ports, at
air inlet between burner and manifold pipe, or debris in the main burner orifice. Soft brush or
vacuum clean affected areas.
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GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
Poorly defined, substantially yellow flames, or flames that appear lazy, indicate poor air supply
to burners or excessive burner input. Verify gas supply type and manifold pressure with rating
plate information.
Poor air supply can be caused by obstructions or blockage in heat exchanger tubes or vent
discharge pipe. Inspect and clean as necessary to eliminate blockage. Vacuum any loose dirt or
loose debris. Clean heat exchanger tubes with a stiff brush. Poor flame characteristics can also
be caused by undersized combustion air openings or flue gas recirculation into combustion air
supply. Increase air opening size or re-direct flue products to prevent recirculation.
Reduced air delivery can also be the result of fan blade slippage, dirt accumulation on the fan
blade or low voltage to draft inducer motor. Inspect draft fan assembly and be sure the fan
blade is secure to motor shaft. Check the line voltage to the furnace.
BURNER FLAMES
FIGURE 8.6.0 BURNER FLAME AT 1.2 INWC [298 PA]
MANIFOLD (PRESSURE DRAFT INDUCER AT HIGH SPEED)
FIGURE 8.6.1 BURNER FLA ME AT HIGH FIRE 3.5 INWC [871 PA]
MANIFOLD (PRESSURE DRAFT INDUCER AT HIGH SPEED)
8.6.2 Shutdown After Unit Start-Up
u
Set thermostat or controller to lowest setting.
u
Turn off electrical supply to unit at disconnect switch.
u
Turn off gas supply at the manual shut-off valve.
u
Disconnect manifold and inlet pressure taps and re-install pipe plugs.
u
Replace vestibule access door.
8.6.3 Normal Operation
u
Turn on electrical supply to furnace at disconnect switch.
u
Turn on gas supply at the manual shut-off valve.
u
Set thermostat or controller to desired temperature.
NOTE: Information
outlining the normal
sequence of operation and a wiring diagram
for the control system
supplied with each furnace
are provided in this manual
and with the information
package shipped with the
unit.
551.800.627.4499
MAINTENANCE
ACCESSORY
NOTE: It may be
necessary to use
a “borescope” to
properly inspect the heat
exchanger tubes.
GH-Series Indirect Gas-Fired Duct Furnace
9.0 MAINTENANCE
Annual maintenance: This duct furnace should be inspected and serviced annually by a qualified service
agency to assure proper operation. Annual servicing of the furnace is normally performed at the beginning
of the heating season.
9.1 FURNACE MODULE INSPECTION
Turn off all electrical power to the unit before inspection and servicing.
u
Visually inspect the condition of the heat exchanger tubes. Look for cracks, heat damage or
other deterioration in the tubes. Any heat exchanger tubes showing failure must be replaced
before the unit is placed back in service.
u
The burner assembly should be disassembled for inspection and cleaning.
u
Burners, igniters and flame sensors should be removed and cleaned. Check for obvious signs
of corrosion, accumulation of dirt and debris and any heat or water related damage. Any
damaged or deteriorated parts should be replaced before the unit is placed back in service.
u
Clean the draft inducer and vent ducts. Fan blades on the draft inducer should be cleaned.
u
Check electrical wiring for loose connections or deteriorated insulation.
u
Check the attachment point of the furnace module to the cabinet or ducts to verify they are
air tight.
u
Check for gas tightness of all pipe joints and connections.
u
Check the automatic gas valve to ensure that the gas valve seat is not leaking.
u
If there is a condensate drain tube, make sure the drain line is not obstructed. Verify that the
drain tube is properly trapped and, if necessary, properly freeze-protected. Clean any debris
or blockage from the drain line.
9.2 FURNACE MODULE OPERATION CHECK
u
Turn on power to the unit and set thermostat or heat controller to call for heat, allowing
furnace module to operate.
u
Check for proper start-up and ignition as outlined in Sequence of Operations (SOO) for the
control provided. The SOO is printed on a separate page and is to be found with the furnace
documentation package.
u
Check the appearance of the burner flame. Reference information in the Installation section of
this manual.
u
Verify that the heat rise is correct. For staged ignition furnaces, check heat rise for each
stage. For modulated furnaces, check heat rise at high fire.
u
Return thermostat or heat controller to normal setting.
CAUTION
If any of the original wiring needs to be replaced, it must be replaced with wiring materials
suitable for 105˚C.
Label all wires prior to disconnection when servicing the unit. Wiring errors can cause improper or dangerous operation. Verify proper operation after servicing.
1.800.627.449956
9.3 SERVICE PARTS
TROUBLESHOOTING
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
FIGURE 9.3.0 SERVICE PARTS - STAGED CONTROL
FIGURE 9.3.1 SERVICE PARTS - MODULATED CONTROL
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SERVICE PARTS
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GH-Series Indirect Gas-Fired Duct Furnace
10.0 TROUBLESHOOTING
Any failure of the duct heater to operate properly can be isolated by:
u
Verify that conditions shown in the start-up portion of this manual are correct
u
Follow the Sequence of Operation (SOO) to determine the point of failure.
The most important resource for trouble shooting is the Sequence of Operation. The sequence
varies for each unit, depending on the furnace size, the turndown ratio and the controls. In
some cases, duct furnaces are controlled by a building management system (BMS) and the
issue may be with the BMS, not with the furnace.
10.1 SEQUENCE OF OPERATIONS (SOO)
Each duct furnace has a specific Sequence of Operation. The SOO is printed separately and
shipped with the furnace documentation package. As an aid to understanding the operation of
the duct furnace, following is a GENERIC sequence of operation.
1. Thermostat (or heat enable) closes and provides a call for heat, powering T2 or T1 and T2.
2. 24 VAC is applied to IC terminal T’STAT, provided that the high limit switch is in the closed
position.
3. The furnace control will check that pressure switch contacts are open.
4. The induced draft fan is energized at high speed.
5. When the air switch (APS-1) closes, a 15 second pre-purge period begins.
6. At the end of pre-purge, the spark commences.
7. Burners ignite and cross-light.
8. When flame is detected by the flame sensor, the spark is shut off immediately while the gas
valve(s) and combustion blower remain energized.
9. During heating operation, the thermostat, pressure switch and main burner flame are
constantly monitored to assure proper system operation.
10. When the thermostat (controller) is satisfied and the demand for heat ends, the gas valve(s)
is de-energized immediately. The control senses loss of flame and a 30 second post-purge
occurs before the fan is de-energized.
Note that the furnace-specific SOO will also provide information regarding ignition and
operational failures, recovery from lockout and a complete set of LED Normal Operation codes
and a set of Error Codes. The SOO provides details that are specific to the controls and turndown of the specific furnace.
10.2 IGNITION CONTROLLER
Problems with ignition can often be diagnosed by viewing the LED indicator on the Series 5
Ignition Controller that is used on all models. The controller monitors operation of the furnace
and will shut down the furnace for a number of reasons and provide a flashing error code. It
also indicates the stages of ignition and correct operation.
1.800.627.449958
WARRANTY
GH-Series Indirect Gas-Fired Duct Furnace ACCESSORY
ERROR CODE:
Solid Green = Normal operation
1 Red Flash = No Flame During Trial
2 Red Flashes = Flame Sense Fail
3 Red Flashes = Pilot Main Relay Fail
4 Red Flashes = Multiple Flame Loss
5 Red Flashes = Rollout Error
6 Red Flashes = APS Airflow Error
7 Red Flashes = Internal Control Error
Solid Red = Line Voltage Error
FIGURE 10.2.0 SERIES 5 IGNITION CONTROLLER
LED
11.0 FACTORY ASSISTANCE
In the unlikely event that you need assistance from the factory for a specific issue with the
Indirect Gas-Fired Furnace, make sure that you have the information called for in the Unit
Records page in the Owner Information section of this manual. The person you speak with at
the factory will need that information to properly identify the unit and the installed options.
To contact RenewAire Customer Service:
Call: 800-627-4499
Email: RenewAireSupport@RenewAire.com
Remember that RenewAire Customer Service can only assist with the products sold by
RenewAire and their options, it cannot resolve engineering issues that result from air handling
system design by others.
12.0 WARRANTY
The RenewAire Indirect Gas-Fired Duct Furnace is covered under the standard RenewAire ERV
warranty. A copy of the warranty is included with the unit manuals. If the warranty should be
lost or misplaced, a PDF version can be downloaded from:
http://www.renewaire.com/support/for-the-professional/documentation/warranty-information
In addition to the standard RenewAire warranty, certain components in the furnace that are
constructed of stainless steel (such as the heat exchanger tubes) have an extended prorated
warranty. RenewAire’s maximum liability on this limited warranty shall decrease as set forth
below. The Customer shall be required to pay a percentage of the current replacement price in
accordance with the following schedule at the time such failure in materials or workmanship
occurs:
WARRANTY YEAR CUSTOMER PAY PERCENTAGE
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year 9
Year 10
0% of List Price
10% of List Price
20% of List Price
30% of List Price
40% of List Price
50% of List Price
60% of List Price
70% of List Price
80% of List Price
90% of List Price
591.800.627.4499
About RenewAire
For over 30 years, RenewAire has been a pioneer in enhancing indoor air quality (IAQ)
in commercial and residential buildings of every size.This is achieved while maximizing
sustainability through our fifth-generation, static-plate, enthalpic-core Energy Recovery
Ventilators (ERVs) that optimize energy efficiency, lower capital costs via load reduction and
decrease operational expenses by minimizing equipment needs, resulting in significant energy
savings. Our ERVs are competitively priced, simple to install, easy to use and maintain and have
a quick payback. They also enjoy the industry’s best warranty with the lowest claims due to
long-term reliability derived from innovative design practices, expert workmanship and Quick
Response Manufacturing (QRM).
As the pioneer of static-plate core technology in North America, RenewAire is the largest ERV
producer in the USA. We’re committed to sustainable manufacturing and lessening our
environmental footprint, and to that end our Waunakee, WI plant is 100% powered by wind
turbines. The facility is also one of the few buildings worldwide to be LEED and Green Globes
certified, as well as having achieved ENERGY STAR Building status. In 2010, RenewAire joined
the Soler & Palau (S&P) Ventilation Group in order to provide direct access to the latest in energyefficient air-moving technologies. For more information, visit: renewaire.com
201 Raemisch Road | Waunakee, WI | 53597 | 800.627.4499 | RenewAire.com
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2019 © RenewAire LLC
138284_004_JUL19
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