Rinnai 37Ahb Users Manual Spec Sheet Cover (7 2010)

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37AHB spec sheet cover (7-2010).ai 7/23/2010 10:16:37 AM

37AHB Series Hydronic Furnace

37AHB Series Hydronic Furnace
Air Delivery

†† Required filter sizes shown are based on the larger of the AHRI (Air
Conditioning & Refrigeration Institute) rated cooling airflow or the heating
airflow velocity of 300 ft/min for throwaway type or 450 ft/min for
high-capacity type.

Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
This product is manufactured in a facility registered by UL to ISO 9001.
File No. A6887.

951
1400 1351 1317 1275 1225 1183 1134 1095 1053 1011
3.0

1573 1530 1490 1448 1417 1372 1327 1293 1253 1221 1175
3.5

1777 1732 1694 1650 1630 1592 1553 1517 1464 1441 1361
4.0

1934 1889 1857 1818 1784 1750 1715 1680 1568 1491 1377
5.0

777
829
887
937
979
1222 1174 1140 1100 1063 1014
2.5

1391 1350 1320 1281 1245 1209 1190 1131 1090 1064 1031
3.0

1561 1524 1490 1456 1428 1396 1364 1330 1230 1265 1224
3.5

1700 1666 1635 1604 1576 1543 1518 1492 1465 1430 1402

466
504
533
626
777
1.5

844

810

734

698

665

581

642
680
715
784
911
2.0

971

942

880

847

817

751

690
908
937
955
984
1148 1128 1103 1072 1045 1012
2.5

889
1343 1318 1296 1270 1248 1225 1197 1168 1109 1025
3.0

510
541
569
628
652
740
1.5

803

768

712

682

768
864
2.0

921

891

836

812

788

596

559
594
699

596
795
841
891

868

TAP 4 (L)

TAP 1 (H)

TAP 4 (L)

AIRFLOW (CFM)

819

772

0.8
0.7
0.6
0.5
0.4
0.3

921
948
2.0

4.0
TAP 1 (H)

37AHB090 with
TAP 2 (MH)
RC98HP, RC80HP,
R94LS, or R75LS TAP 3 (ML)

‡ Airflows shown are nominal (blower speeds are factory set). For air
delivery other than stated, refer to the Air Delivery & Performance table.

Side intake filter to be (1) 20”x20”x1” typical for all models.

37AHB075 with
TAP 2 (MH)
RC98HP, RC80HP,
R94LS, or R75LS TAP 3 (ML)

Tested in accordance with ANSI/ASHRAE Standard 37-Latest edition.

PATENT PENDING

AHB90
AHB75
AHB60

FEATURES
● Four models covering a range of heating capacities
○ 27,100 to 96,300 BTU/hour
● Multi-position (upflow, downflow, horizontal left,
horizontal right) without modifications *
○ Modifiable for side-entry return air
● Low-flow, high-head pump custom designed to work
with Rinnai's tankless water heaters
● Integrated control board with learning algorithm
● No combustion air infiltration losses when used with
a Rinnai tankless water heater
● Four selectable heat blower off delay times
● Strong 20-gauge steel cabinet

TAP 1 (H)
37AHB060 with
RC98HP, RC80HP, TAP 2 (MH)
R94LS, R75LS, or TAP 4 (ML)
V53i
TAP 5 (L)

†

Part of the Rinnai Tankless Heating System

● Multi-speed motors (ECM)

37AHB045 with
TAP 3 (H)
RC98HP, RC80HP,
TAP 4 (M)
R94LS, R75LS, or
V53i
TAP 5 (L)

K

701

0.9
CMY

0.2

CY

0.1

MY

0

CM

UNIT SIZE

Y

External Static Pressure (ESP)

M

SUPPORTS
COOLING
ECM SPEED
CAP. RANGE
TAP
(TONS)

NOMINAL AIR DELIVERY CHART (BOTTOM OR SIDE RETURN w/ FILTER)

C

742

567

37AHB Series Hydronic Furnace

1.0

Specifications

○ Galvanized, painted
○ Fully insulated cabinet
○ Low 34 inch profile
● Multi-position control box
● Designed for serviceability
● Schrader valves to purge air from the system

AHB45
The optimum in hydronic technology, the newly
designed Rinnai® multi-position hydronic furnaces
offer a unique solution for a wide variety of small- and
medium-sized residential and light commercial
applications. They are compact and ready to fit in tight
spaces which may include, but not limited to, attics,
basements, closets, crawlspaces, and utility rooms.
Intelligent Microprocessor Controller
The 37AHB units are equipped with an intelligent
microprocessor control that allows for domestic hot
water priority and adapts to available hot water flow for
space heating by automatically regulating the pump
and fan sequence to maximize comfort.
Fine Tuned to Work with Rinnai Tankless
Water Heaters
These unique hydronic furnaces are designed to work
in combination with our line of Rinnai® tankless water
heaters to deliver heating capacities that cover a wide
spectrum of residential and light commercial heating
applications. When combined, the units form the Rinnai
Tankless Heating System, the first matched, tankless
hydronic heating solution in the industry!

● Integral filter rack with filter

This product is manufactured in a
facility registered by UL to ISO
9001.

● Fan motor with ECM technology
* NOTE: The unit is not designed to be installed on its back or
face down.

UL recogniz ed
component

600000060 (7/2010)

37AHB spec sheet inside (7-2010).ai 7/23/2010 11:58:33 AM

37AHB Series Hydronic Furnace

37AHB Series Hydronic Furnace

20 gauge
prepainted
galvanized steel
fully insulated

CABINET

HEAT
EXCHANGER

copper tube
aluminum fin

PUMP

high-head
low-flow
integrated check valve

BLOWER
ASSEMBLY

FIELD-SUPPLIED ACCESSORIES capable of interfacing with the Rinnai Hydronic Furnace:
Humidifier (HUM)

Connect an auxiliary 2.5 FLA, 2.5 LRA @ 115 VAC max Humidifier.
Connections are made via the “HUM” quick connects. The humidifier
output is on whenever a heating demand is being satisfied. The
contacts of this output are isolated to allow application of 24 VAC or
115 VAC to one terminal and the humidifier load to the other.

Electronic Air Cleaner (EAC)

Connect an auxiliary Electronic Air Cleaner; rating shall be max 1.0
Amp @ 115 VAC. This output is energized whenever any of the four
blower speeds are energized. Connections are made via 0.250 x
0.032” male quick connect terminals labeled "EAC" and "N3".

multi-speed motor (ECM)

Y

integrated
microprocessor based

mm
355.6
444.5
533.4
622.3

37AH

B

045

08

K

1"

2 1/8"

A 5

Model

Multi-position

37AH - Multi-speed Hydronic Furnace

5 = Yes
2 = No

Series

K

FLOW SENSOR *

Programmable, 5-2 days;
both A/C and heat pump
versions

For domestic hot water priority
* Supplied with the unit

ANTI-SCALD MIXING
VALVE

FILTER RACK
and BOTTOM FILL PLATES

To maintain safe domestic
hot water temperature

For modification to allow side-entry
return airflow
Factory available from Rinnai

mm
304.8
406.4
508
609.6

in.
10 - 1/2
16 - 11/16
18 - 11/16
21 - 1/8

mm
266.7
423.9
474.7
536.6

in.
19
19 - 1/4
19 - 1/2
19

mm
482.6
489
495.3
482.6

BACK
zero

SIDE
zero
34"

17 13/16"

SIDE
zero

18 5/16"
1"

045 = 45,000
060 = 60,000
075 = 75,000
090 = 90,000

Voltage Code (V-Ph-HZ)
Cooling / Heating
Air Flow Range (CFM)

120º F
130º F
140º F
150º F
160º F

6"

SERVICING
24” (610 mm)

AHB60 (BTU)
36,400
45,100
50,800
59,700
68,100

AHB75 (BTU)
43,700
52,900
61,600
70,400
78,900

1 3/8"

22"

BOTTOM
zero

Minimum Clearance to
Combustible Construction

Warranty

Nominal heating capacities as tested with Rinnai tankless water heaters.
For final rated capacities refer to the Air Delivery and Performance
Tables in the Operation and Installation Manual.
AHB45 (BTU)
27,700
33,300
40,100
47,700
51,200

A

K = 115 - 1 - 60
L = 240 - 1 - 50 (export models)

08 = 800 (650-800)
12 = 1200 (650-1200)
14 = 1400 (1000-1600)
16 = 1600 (1200-1750)

Heating Capacities

D

Denotes minor change

Nominal Heating Capacity (BTU/h)

THERMOSTATS

in.
12
16
20
24

E

FRONT
zero

E

Engineering Digit

A - Unit with PSC Motor
B - Unit with ECM Technology

Accessories

mm
457.2
457.2
457.2
457.2

D

TOP/PLENUM
zero

CY

CMY

in.
18
18
18
18

C

C

B

Nomenclature

FILTER

in.
14
17 -1/2
21
24 - 1/2

B

17 13/16"

CM

MY

UNIT SIZE
37AHB04508KA5 (AHB45)
37AHB06012KA5 (AHB60)
37AHB07514KA5 (AHB75)
37AHB09016KA5 (AHB90)

Can accomodate most brands of evaporator A-coil for cooling
applications.

C

CONTROL
BOARD

A

Connect an auxiliary UV lamp (if required); rating shall be max 1.0
Amp @ 115 VAC. This output is energized whenever any of the four
blower speeds are energized. Connections are made via 0.250 x
0.032” male quick connect terminals labeled "UV" and "N2".

UV Lamp

Cooling Coil
M

Dimensions

Optional Equipment

Equipment

37AHB Series Hydronic Furnace

AHB90 (BTU)
54,900
63,900
76,200
86,600
96,300

Parts: 5 years * / Labor: 1 year *

* In order to receive full warranty coverage on the Hyrdronic Furnace when connected to any other type or
brand of product other than a Rinnai tankless water heater, the flow rate through the Hydronic Furnace
must not exceed a maximum of 5 GPM.
Rinnai will repair or replace the covered product or any part or component that is defective in materials or
workmanship as set forth.
Rinnai will pay reasonable labor charges associated with the repair or replacement of any such part or
component.
All repair parts must be genuine Rinnai parts. All repairs or replacements must be performed by an
individual or servicing company that is properly trained, state qualified or licensed to do the type of repair.

37AHB spec sheet inside (7-2010).ai 7/23/2010 11:58:33 AM

37AHB Series Hydronic Furnace

37AHB Series Hydronic Furnace

20 gauge
prepainted
galvanized steel
fully insulated

CABINET

HEAT
EXCHANGER

copper tube
aluminum fin

PUMP

high-head
low-flow
integrated check valve

BLOWER
ASSEMBLY

FIELD-SUPPLIED ACCESSORIES capable of interfacing with the Rinnai Hydronic Furnace:
Humidifier (HUM)

Connect an auxiliary 2.5 FLA, 2.5 LRA @ 115 VAC max Humidifier.
Connections are made via the “HUM” quick connects. The humidifier
output is on whenever a heating demand is being satisfied. The
contacts of this output are isolated to allow application of 24 VAC or
115 VAC to one terminal and the humidifier load to the other.

Electronic Air Cleaner (EAC)

Connect an auxiliary Electronic Air Cleaner; rating shall be max 1.0
Amp @ 115 VAC. This output is energized whenever any of the four
blower speeds are energized. Connections are made via 0.250 x
0.032” male quick connect terminals labeled "EAC" and "N3".

multi-speed motor (ECM)

Y

integrated
microprocessor based

mm
355.6
444.5
533.4
622.3

37AH

B

045

08

K

1"

2 1/8"

A 5

Model

Multi-position

37AH - Multi-speed Hydronic Furnace

5 = Yes
2 = No

Series

K

FLOW SENSOR *

Programmable, 5-2 days;
both A/C and heat pump
versions

For domestic hot water priority
* Supplied with the unit

ANTI-SCALD MIXING
VALVE

FILTER RACK
and BOTTOM FILL PLATES

To maintain safe domestic
hot water temperature

For modification to allow side-entry
return airflow
Factory available from Rinnai

mm
304.8
406.4
508
609.6

in.
10 - 1/2
16 - 11/16
18 - 11/16
21 - 1/8

mm
266.7
423.9
474.7
536.6

in.
19
19 - 1/4
19 - 1/2
19

mm
482.6
489
495.3
482.6

BACK
zero

SIDE
zero
34"

17 13/16"

SIDE
zero

18 5/16"
1"

045 = 45,000
060 = 60,000
075 = 75,000
090 = 90,000

Voltage Code (V-Ph-HZ)
Cooling / Heating
Air Flow Range (CFM)

120º F
130º F
140º F
150º F
160º F

6"

SERVICING
24” (610 mm)

AHB60 (BTU)
36,400
45,100
50,800
59,700
68,100

AHB75 (BTU)
43,700
52,900
61,600
70,400
78,900

1 3/8"

22"

BOTTOM
zero

Minimum Clearance to
Combustible Construction

Warranty

Nominal heating capacities as tested with Rinnai tankless water heaters.
For final rated capacities refer to the Air Delivery and Performance
Tables in the Operation and Installation Manual.
AHB45 (BTU)
27,700
33,300
40,100
47,700
51,200

A

K = 115 - 1 - 60
L = 240 - 1 - 50 (export models)

08 = 800 (650-800)
12 = 1200 (650-1200)
14 = 1400 (1000-1600)
16 = 1600 (1200-1750)

Heating Capacities

D

Denotes minor change

Nominal Heating Capacity (BTU/h)

THERMOSTATS

in.
12
16
20
24

E

FRONT
zero

E

Engineering Digit

A - Unit with PSC Motor
B - Unit with ECM Technology

Accessories

mm
457.2
457.2
457.2
457.2

D

TOP/PLENUM
zero

CY

CMY

in.
18
18
18
18

C

C

B

Nomenclature

FILTER

in.
14
17 -1/2
21
24 - 1/2

B

17 13/16"

CM

MY

UNIT SIZE
37AHB04508KA5 (AHB45)
37AHB06012KA5 (AHB60)
37AHB07514KA5 (AHB75)
37AHB09016KA5 (AHB90)

Can accomodate most brands of evaporator A-coil for cooling
applications.

C

CONTROL
BOARD

A

Connect an auxiliary UV lamp (if required); rating shall be max 1.0
Amp @ 115 VAC. This output is energized whenever any of the four
blower speeds are energized. Connections are made via 0.250 x
0.032” male quick connect terminals labeled "UV" and "N2".

UV Lamp

Cooling Coil
M

Dimensions

Optional Equipment

Equipment

37AHB Series Hydronic Furnace

AHB90 (BTU)
54,900
63,900
76,200
86,600
96,300

Parts: 5 years * / Labor: 1 year *

* In order to receive full warranty coverage on the Hyrdronic Furnace when connected to any other type or
brand of product other than a Rinnai tankless water heater, the flow rate through the Hydronic Furnace
must not exceed a maximum of 5 GPM.
Rinnai will repair or replace the covered product or any part or component that is defective in materials or
workmanship as set forth.
Rinnai will pay reasonable labor charges associated with the repair or replacement of any such part or
component.
All repair parts must be genuine Rinnai parts. All repairs or replacements must be performed by an
individual or servicing company that is properly trained, state qualified or licensed to do the type of repair.

37AHB spec sheet inside (7-2010).ai 7/23/2010 11:58:33 AM

37AHB Series Hydronic Furnace

37AHB Series Hydronic Furnace

20 gauge
prepainted
galvanized steel
fully insulated

CABINET

HEAT
EXCHANGER

copper tube
aluminum fin

PUMP

high-head
low-flow
integrated check valve

BLOWER
ASSEMBLY

FIELD-SUPPLIED ACCESSORIES capable of interfacing with the Rinnai Hydronic Furnace:
Humidifier (HUM)

Connect an auxiliary 2.5 FLA, 2.5 LRA @ 115 VAC max Humidifier.
Connections are made via the “HUM” quick connects. The humidifier
output is on whenever a heating demand is being satisfied. The
contacts of this output are isolated to allow application of 24 VAC or
115 VAC to one terminal and the humidifier load to the other.

Electronic Air Cleaner (EAC)

Connect an auxiliary Electronic Air Cleaner; rating shall be max 1.0
Amp @ 115 VAC. This output is energized whenever any of the four
blower speeds are energized. Connections are made via 0.250 x
0.032” male quick connect terminals labeled "EAC" and "N3".

multi-speed motor (ECM)

Y

integrated
microprocessor based

mm
355.6
444.5
533.4
622.3

37AH

B

045

08

K

1"

2 1/8"

A 5

Model

Multi-position

37AH - Multi-speed Hydronic Furnace

5 = Yes
2 = No

Series

K

FLOW SENSOR *

Programmable, 5-2 days;
both A/C and heat pump
versions

For domestic hot water priority
* Supplied with the unit

ANTI-SCALD MIXING
VALVE

FILTER RACK
and BOTTOM FILL PLATES

To maintain safe domestic
hot water temperature

For modification to allow side-entry
return airflow
Factory available from Rinnai

mm
304.8
406.4
508
609.6

in.
10 - 1/2
16 - 11/16
18 - 11/16
21 - 1/8

mm
266.7
423.9
474.7
536.6

in.
19
19 - 1/4
19 - 1/2
19

mm
482.6
489
495.3
482.6

BACK
zero

SIDE
zero
34"

17 13/16"

SIDE
zero

18 5/16"
1"

045 = 45,000
060 = 60,000
075 = 75,000
090 = 90,000

Voltage Code (V-Ph-HZ)
Cooling / Heating
Air Flow Range (CFM)

120º F
130º F
140º F
150º F
160º F

6"

SERVICING
24” (610 mm)

AHB60 (BTU)
36,400
45,100
50,800
59,700
68,100

AHB75 (BTU)
43,700
52,900
61,600
70,400
78,900

1 3/8"

22"

BOTTOM
zero

Minimum Clearance to
Combustible Construction

Warranty

Nominal heating capacities as tested with Rinnai tankless water heaters.
For final rated capacities refer to the Air Delivery and Performance
Tables in the Operation and Installation Manual.
AHB45 (BTU)
27,700
33,300
40,100
47,700
51,200

A

K = 115 - 1 - 60
L = 240 - 1 - 50 (export models)

08 = 800 (650-800)
12 = 1200 (650-1200)
14 = 1400 (1000-1600)
16 = 1600 (1200-1750)

Heating Capacities

D

Denotes minor change

Nominal Heating Capacity (BTU/h)

THERMOSTATS

in.
12
16
20
24

E

FRONT
zero

E

Engineering Digit

A - Unit with PSC Motor
B - Unit with ECM Technology

Accessories

mm
457.2
457.2
457.2
457.2

D

TOP/PLENUM
zero

CY

CMY

in.
18
18
18
18

C

C

B

Nomenclature

FILTER

in.
14
17 -1/2
21
24 - 1/2

B

17 13/16"

CM

MY

UNIT SIZE
37AHB04508KA5 (AHB45)
37AHB06012KA5 (AHB60)
37AHB07514KA5 (AHB75)
37AHB09016KA5 (AHB90)

Can accomodate most brands of evaporator A-coil for cooling
applications.

C

CONTROL
BOARD

A

Connect an auxiliary UV lamp (if required); rating shall be max 1.0
Amp @ 115 VAC. This output is energized whenever any of the four
blower speeds are energized. Connections are made via 0.250 x
0.032” male quick connect terminals labeled "UV" and "N2".

UV Lamp

Cooling Coil
M

Dimensions

Optional Equipment

Equipment

37AHB Series Hydronic Furnace

AHB90 (BTU)
54,900
63,900
76,200
86,600
96,300

Parts: 5 years * / Labor: 1 year *

* In order to receive full warranty coverage on the Hyrdronic Furnace when connected to any other type or
brand of product other than a Rinnai tankless water heater, the flow rate through the Hydronic Furnace
must not exceed a maximum of 5 GPM.
Rinnai will repair or replace the covered product or any part or component that is defective in materials or
workmanship as set forth.
Rinnai will pay reasonable labor charges associated with the repair or replacement of any such part or
component.
All repair parts must be genuine Rinnai parts. All repairs or replacements must be performed by an
individual or servicing company that is properly trained, state qualified or licensed to do the type of repair.

37AHB spec sheet cover (7-2010).ai 7/23/2010 10:16:37 AM

37AHB Series Hydronic Furnace

37AHB Series Hydronic Furnace
Air Delivery

†† Required filter sizes shown are based on the larger of the AHRI (Air
Conditioning & Refrigeration Institute) rated cooling airflow or the heating
airflow velocity of 300 ft/min for throwaway type or 450 ft/min for
high-capacity type.

Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
This product is manufactured in a facility registered by UL to ISO 9001.
File No. A6887.

951
1400 1351 1317 1275 1225 1183 1134 1095 1053 1011
3.0

1573 1530 1490 1448 1417 1372 1327 1293 1253 1221 1175
3.5

1777 1732 1694 1650 1630 1592 1553 1517 1464 1441 1361
4.0

1934 1889 1857 1818 1784 1750 1715 1680 1568 1491 1377
5.0

777
829
887
937
979
1222 1174 1140 1100 1063 1014
2.5

1391 1350 1320 1281 1245 1209 1190 1131 1090 1064 1031
3.0

1561 1524 1490 1456 1428 1396 1364 1330 1230 1265 1224
3.5

1700 1666 1635 1604 1576 1543 1518 1492 1465 1430 1402

466
504
533
626
777
1.5

844

810

734

698

665

581

642
680
715
784
911
2.0

971

942

880

847

817

751

690
908
937
955
984
1148 1128 1103 1072 1045 1012
2.5

889
1343 1318 1296 1270 1248 1225 1197 1168 1109 1025
3.0

510
541
569
628
652
740
1.5

803

768

712

682

768
864
2.0

921

891

836

812

788

596

559
594
699

596
795
841
891

868

TAP 4 (L)

TAP 1 (H)

TAP 4 (L)

AIRFLOW (CFM)

819

772

0.8
0.7
0.6
0.5
0.4
0.3

921
948
2.0

4.0
TAP 1 (H)

37AHB090 with
TAP 2 (MH)
RC98HP, RC80HP,
R94LS, or R75LS TAP 3 (ML)

‡ Airflows shown are nominal (blower speeds are factory set). For air
delivery other than stated, refer to the Air Delivery & Performance table.

Side intake filter to be (1) 20”x20”x1” typical for all models.

37AHB075 with
TAP 2 (MH)
RC98HP, RC80HP,
R94LS, or R75LS TAP 3 (ML)

Tested in accordance with ANSI/ASHRAE Standard 37-Latest edition.

PATENT PENDING

AHB90
AHB75
AHB60

FEATURES
● Four models covering a range of heating capacities
○ 27,100 to 96,300 BTU/hour
● Multi-position (upflow, downflow, horizontal left,
horizontal right) without modifications *
○ Modifiable for side-entry return air
● Low-flow, high-head pump custom designed to work
with Rinnai's tankless water heaters
● Integrated control board with learning algorithm
● No combustion air infiltration losses when used with
a Rinnai tankless water heater
● Four selectable heat blower off delay times
● Strong 20-gauge steel cabinet

TAP 1 (H)
37AHB060 with
RC98HP, RC80HP, TAP 2 (MH)
R94LS, R75LS, or TAP 4 (ML)
V53i
TAP 5 (L)

†

Part of the Rinnai Tankless Heating System

● Multi-speed motors (ECM)

37AHB045 with
TAP 3 (H)
RC98HP, RC80HP,
TAP 4 (M)
R94LS, R75LS, or
V53i
TAP 5 (L)

K

701

0.9
CMY

0.2

CY

0.1

MY

0

CM

UNIT SIZE

Y

External Static Pressure (ESP)

M

SUPPORTS
COOLING
ECM SPEED
CAP. RANGE
TAP
(TONS)

NOMINAL AIR DELIVERY CHART (BOTTOM OR SIDE RETURN w/ FILTER)

C

742

567

37AHB Series Hydronic Furnace

1.0

Specifications

○ Galvanized, painted
○ Fully insulated cabinet
○ Low 34 inch profile
● Multi-position control box
● Designed for serviceability
● Schrader valves to purge air from the system

AHB45
The optimum in hydronic technology, the newly
designed Rinnai® multi-position hydronic furnaces
offer a unique solution for a wide variety of small- and
medium-sized residential and light commercial
applications. They are compact and ready to fit in tight
spaces which may include, but not limited to, attics,
basements, closets, crawlspaces, and utility rooms.
Intelligent Microprocessor Controller
The 37AHB units are equipped with an intelligent
microprocessor control that allows for domestic hot
water priority and adapts to available hot water flow for
space heating by automatically regulating the pump
and fan sequence to maximize comfort.
Fine Tuned to Work with Rinnai Tankless
Water Heaters
These unique hydronic furnaces are designed to work
in combination with our line of Rinnai® tankless water
heaters to deliver heating capacities that cover a wide
spectrum of residential and light commercial heating
applications. When combined, the units form the Rinnai
Tankless Heating System, the first matched, tankless
hydronic heating solution in the industry!

● Integral filter rack with filter

This product is manufactured in a
facility registered by UL to ISO
9001.

● Fan motor with ECM technology
* NOTE: The unit is not designed to be installed on its back or
face down.

UL recogniz ed
component

600000060 (7/2010)

37AHB spec sheet cover (7-2010).ai 7/23/2010 10:16:37 AM

37AHB Series Hydronic Furnace

37AHB Series Hydronic Furnace
Air Delivery

†† Required filter sizes shown are based on the larger of the AHRI (Air
Conditioning & Refrigeration Institute) rated cooling airflow or the heating
airflow velocity of 300 ft/min for throwaway type or 450 ft/min for
high-capacity type.

Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
This product is manufactured in a facility registered by UL to ISO 9001.
File No. A6887.

951
1400 1351 1317 1275 1225 1183 1134 1095 1053 1011
3.0

1573 1530 1490 1448 1417 1372 1327 1293 1253 1221 1175
3.5

1777 1732 1694 1650 1630 1592 1553 1517 1464 1441 1361
4.0

1934 1889 1857 1818 1784 1750 1715 1680 1568 1491 1377
5.0

777
829
887
937
979
1222 1174 1140 1100 1063 1014
2.5

1391 1350 1320 1281 1245 1209 1190 1131 1090 1064 1031
3.0

1561 1524 1490 1456 1428 1396 1364 1330 1230 1265 1224
3.5

1700 1666 1635 1604 1576 1543 1518 1492 1465 1430 1402

466
504
533
626
777
1.5

844

810

734

698

665

581

642
680
715
784
911
2.0

971

942

880

847

817

751

690
908
937
955
984
1148 1128 1103 1072 1045 1012
2.5

889
1343 1318 1296 1270 1248 1225 1197 1168 1109 1025
3.0

510
541
569
628
652
740
1.5

803

768

712

682

768
864
2.0

921

891

836

812

788

596

559
594
699

596
795
841
891

868

TAP 4 (L)

TAP 1 (H)

TAP 4 (L)

AIRFLOW (CFM)

819

772

0.8
0.7
0.6
0.5
0.4
0.3

921
948
2.0

4.0
TAP 1 (H)

37AHB090 with
TAP 2 (MH)
RC98HP, RC80HP,
R94LS, or R75LS TAP 3 (ML)

‡ Airflows shown are nominal (blower speeds are factory set). For air
delivery other than stated, refer to the Air Delivery & Performance table.

Side intake filter to be (1) 20”x20”x1” typical for all models.

37AHB075 with
TAP 2 (MH)
RC98HP, RC80HP,
R94LS, or R75LS TAP 3 (ML)

Tested in accordance with ANSI/ASHRAE Standard 37-Latest edition.

PATENT PENDING

AHB90
AHB75
AHB60

FEATURES
● Four models covering a range of heating capacities
○ 27,100 to 96,300 BTU/hour
● Multi-position (upflow, downflow, horizontal left,
horizontal right) without modifications *
○ Modifiable for side-entry return air
● Low-flow, high-head pump custom designed to work
with Rinnai's tankless water heaters
● Integrated control board with learning algorithm
● No combustion air infiltration losses when used with
a Rinnai tankless water heater
● Four selectable heat blower off delay times
● Strong 20-gauge steel cabinet

TAP 1 (H)
37AHB060 with
RC98HP, RC80HP, TAP 2 (MH)
R94LS, R75LS, or TAP 4 (ML)
V53i
TAP 5 (L)

†

Part of the Rinnai Tankless Heating System

● Multi-speed motors (ECM)

37AHB045 with
TAP 3 (H)
RC98HP, RC80HP,
TAP 4 (M)
R94LS, R75LS, or
V53i
TAP 5 (L)

K

701

0.9
CMY

0.2

CY

0.1

MY

0

CM

UNIT SIZE

Y

External Static Pressure (ESP)

M

SUPPORTS
COOLING
ECM SPEED
CAP. RANGE
TAP
(TONS)

NOMINAL AIR DELIVERY CHART (BOTTOM OR SIDE RETURN w/ FILTER)

C

742

567

37AHB Series Hydronic Furnace

1.0

Specifications

○ Galvanized, painted
○ Fully insulated cabinet
○ Low 34 inch profile
● Multi-position control box
● Designed for serviceability
● Schrader valves to purge air from the system

AHB45
The optimum in hydronic technology, the newly
designed Rinnai® multi-position hydronic furnaces
offer a unique solution for a wide variety of small- and
medium-sized residential and light commercial
applications. They are compact and ready to fit in tight
spaces which may include, but not limited to, attics,
basements, closets, crawlspaces, and utility rooms.
Intelligent Microprocessor Controller
The 37AHB units are equipped with an intelligent
microprocessor control that allows for domestic hot
water priority and adapts to available hot water flow for
space heating by automatically regulating the pump
and fan sequence to maximize comfort.
Fine Tuned to Work with Rinnai Tankless
Water Heaters
These unique hydronic furnaces are designed to work
in combination with our line of Rinnai® tankless water
heaters to deliver heating capacities that cover a wide
spectrum of residential and light commercial heating
applications. When combined, the units form the Rinnai
Tankless Heating System, the first matched, tankless
hydronic heating solution in the industry!

● Integral filter rack with filter

This product is manufactured in a
facility registered by UL to ISO
9001.

● Fan motor with ECM technology
* NOTE: The unit is not designed to be installed on its back or
face down.

UL recogniz ed
component

600000060 (7/2010)



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