BERKO HUHAA320FC, HUHAA324FC, HUHAA327FC, HUHAA348FC, HUHAA520FC User Manual

...

HUHAAFC Series

Modular Unit Heaters

Installation, Operation & Maintenance Instructions

Specifications

Basic Model Height Width Depth Weight Compartment No. in (mm) in. (mm) in. (mm) lbs. (kg) Volume

HUHAA320FC HUHAA324FC HUHAA327FC HUHAA348FC HUHAA520FC

16 14 7

(406.4) (355.6) (190.5) HUHAA524FC HUHAA527FC HUHAA548FC HUHAA724FC HUHAA720FC HUHAA727FC HUHAA748FC HUHAA1020FC

19 71/

(552.5) (482.6) (190.5) (1639 cm

HUHAA1024FC HUHAA1027FC HUHAA1048FC

Mounting Wiring

27 (12.2) 27 (12.2) 27 (12.2) 30 (13.6)

38 (17.2) 38 (17.2)

38 (17.2) 38 (17.2) 38 (17.2) 38 (17.2) 38 (17.2)

38 (17.2)

90 in

(14.70 cm

100 in

)

Basic Mode Height Width Depth Weight Compartment No. in (mm) in. (mm) in. (mm) lbs. (kg) Volume

HUHAA1520FC HUHAA1524FC HUHAA1548FC HUHAA2020FC HUHAA2024FC HUHAA2048FC HUHAA2524FC HUHAA2548AFC HUHAA3020FC HUHAA3024FC HUHAA3048AFC HUHAA4024FC HUHAA4048FC HUHAA5024FC HUHAA5020FC HUHAA5048FC

19 123/

113/

171/

(552.5) (482.6) (323.9)

30 26

(76.2) (676.4) (298.5) (8260 cm

30 26

(76.2) (676.4) (435.1) (10620 cm

54 (24.5) 50 (22.7) 50 (22.7) 60 (27.2) 55 (24.9) 55 (24.9) 89 (40.4) 89 (40.4) 89 (40.4) 89 (40.4)

89 (40.4) 119 (54.0) 119 (54.0) 119 (54.0) 119 (54.0) 119 (54.0)

140 in

(2295 cm

504 in

648 in

Mounting Wiring

)

ECR 41912 07/19 5200-11106-004

IMPORTANT INSTRUCTIONS

WARNING

WHEN USING ELECTRIC APPLIANCES, BASIC PRECAUTIONS SHOULD ALWAYS BE FOLLOWED TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, AND INJURY TO PERSONS, INCLUDING THE FOLLOWING:

1. Read all instructions before installing or using this heater.

2. This heater is a commercial/industrial product not intended for use in a residential setting.

3. This heater is hot when in use. To avoid burns, do not let bare skin touch hot surfaces. Keep combustible materials, such as furniture, pillows, bedding, papers, clothes, etc. and curtains at least 3 feet (0.9 m) from the front of the heater.

4. Extreme caution is necessary when any heater is used by or near children or invalids and whenever the heater is left operating and unattended.

5. This heater has hot and arcing or sparking parts inside and is not intended for use in hazardous atmospheres where flammable vapors, gases, liquids or other combustible atmospheres as defined in the National Electrical Code are used or stored. Failure to comply can result in explosion or fire.

6. Do not operate any heater after it malfunctions. Disconnect power at service panel and have heater inspected by a reputable electrician before using.

7. Do not use outdoors.

8. To disconnect heater, turn controls to off, and turn off power to heater circuit at main disconnect panel.

9. Do not insert or allow foreign objects to enter any ventilation or exhaust opening as this may cause an electric shock, fire, or damage to the heater.

10. To prevent a possible fire, do not block air intake or exhaust in any manner.

11. Use this heater only as described in this manual. Any other use not recommended by the manufacturer may cause fire,

12. This heater is not intended for use in special environments. Do not use in damp or wet locations such as marine or greenhouse or in areas where corrosive or chemical agents are present.

13. When installing, see INSTALLATION INSTRUCTIONS for additional warnings and precautions.

14. For safe and efficient operation, and to extend the life of your heater, keep your heater clean - See MAINTENANCE INSTRUCTIONS.

SAVE THESE INSTRUCTIONS

INSTALLATION INSTRUCTIONS

WARNING

To prevent a possible fire, injury to persons or damage to the heater, adhere to the following:

1. Disconnect all power coming to heater at main service panel before wiring or servicing.

Important Note: This heater must be installed by a qualified person.

2. All wiring procedures and connections must be in accordance with the National and Local Codes having jurisdiction and the heater must be grounded.

3. Verify the power supply voltage coming to heater matches the ratings as shown on the heater nameplate.

CAUTION: ENERGIZING HEATER AT A VOLTAGE GREATER THAN THE VOLTAGE PRINTED ON THE NAMEPLATE WILL DAMAGE THE HEATER AND VOID THE WARRANTY AND COULD CAUSE A FIRE.

Heater Location Instructions

Arrange units so that discharge air streams: a. are subjected to a minimum of interference from columns,

machinery and partitions; b. wipe exposed walls without blowing directly at them; c. are directed away from room occupants in comfort heating; d. are directed along the windward side when installed in a

building exposed to a prevailing wind.

4. To reduce the risk of fire, do not store or use gasoline or other flammable vapors and liquids in the vicinity of the heater.

5. The ceiling or wall mounting structure and the anchoring provisions must be of sufficient strength to support the combined weight of the heater and mounting bracket.

6. All built-in thermostats: If the heater is used to prevent piping or liquids from freezing, and if the thermostat is set below 45° F (7°C), the fan must run continuously.

7. The heater must be mounted at least 7’ (2134 mm) above the floor to avoid accidental contact with the fan blade which could cause injury.

8. Keep at least 5’ clearance in front of the heater. Refer to Table 1 for side, top and back clearance requirements.

9. Do not mount mercury type thermostat directly on unit. Vibration could cause heater to malfunction.

Locate thermostats approximately 5' (1524mm) above the floor on interior partition walls or post away from cold drafts, internal heat sources and away from heater discharge air streams.

Small rooms can be heated by one unit heater. Large rooms require multi-unit installations. Number and capaci-

ty of units will be determined by volume of building and square feet of floor area to be heated. Arrange units to provide perimeter air circulation where each unit supports the air stream from another.

Mounting the Heater - General

The heater may be mounted to discharge the heated air either horizontally or vertically. When the heater is mounted for vertical discharge, it is recommended that the heater be positioned so that the access door will open away from the wall to provide greater access to the wiring and control compartment. If the heater is to be mounted with the access door facing a wall, the heater must be mounted far enough from that wall to allow full opening of the access door (a distance approximately equal to the width of the heater, check clearance before installing). Refer to Table 1 for wall and ceiling clearances before mounting heater.

The heater may be mounted for either vertical or horizontal discharge by the use of th ed rod sizes required.) Observe the detailed procedures in the following installation instructions.

The heater may also be suspended from the wall or ceiling by means of an optional mounting bracket (type MMB or MCMB) which permits horizontal pivoting of the heater.

After the heater is installed, the louvers may be positioned to direct the heated air in the desired direction. When the heater is installed for horizontal discharge, the louvers should direct the air either straight ahead or downward. Directing the air upward may cause the heated air to remain in the ceiling area and waste energy.

Table 1. Wall and Ceiling Clearance, inches (mm)

Minimum Floor to Bottom of heater clearance is 7 feet

Unit Discharge Ceiling Side Wall Back Wall

Horiz. 2 (50.8) 6 (152.4) 9 (228.6)

3 & 5 kW

Vert. 6 (152.4) 18 (457.2) 18 (457.2)

Horiz. 6 (152.4) 6 (152.4) 13 (330.2)

7.5 to 10 kW Vert. 6 (152.4) 24 (609.6) 24 (609.6)

Horiz. 6 (152.4) 9 (228.6) 12

15 to 20 kW

Vert 6 (152.4) 24 (609.6) 24 (609.6)

Horiz. 16 (406.4) 12 (304.8) 18

25 to 50 kW

MOUNTING ROD

LOCK NUT

B A C K

W A L L

Vert. 12 (304.8) 36 (914.4) 39 (914.4)

CEILING

Figure 1. Horizontal Discharge Mounting and Spacing.

Table 2. Rod Thread and Spacing Dimensions, inches (mm)

for Horizontal Discharge

Rod Thread

Unit Type A B C D

3 - 5 kW

7.5 - 10 kW

15 - 20 kW

25 - 30 kW

40 - 50 kW

readed rods. (Refer to Table 2 for thread-

BACK WALL

(TOP VIEW)

6 4

(152.4) (103.1) (19.0)

87/

(225.6) (130.3) (19.0)

14 - 12 63/

51/

/16- 18

/8- 16

THREADED MOUNTING HOLES

UNIT HEATER

61/

(153.9)

(289.0)

(268.2) (368.3) (157.2) (16.0)

1515/

(404.9) (368.3) (157.2) (16.0)

/2(317.5)

/2(470.0)

S I D E

W A L L

Horizontal Discharge (Rod-mount from Ceiling)

1. Install four threaded mounting rods in the threaded holes and in place using lock nuts. (See Table 2).

secure

2. Securely attach the four mounting rods to the ceiling. (Refer

to Table 1 for wall and ceiling clearances, and Table 2 for mounting rod spacing).

Table 3. Rod Thread and Spacing Dimensions, inches (mm)

for Vertical Discharge

Rod Thread

Unit Type E F G H

3 - 5 kW

7.5 - 20 kW

25 - 30 kW

ACCESS DOOR

B A C K

W A L L

/16- 18

/8- 16

CEILING

LOCK NUT

CLEARANCE EQUAL TO WIDTH OF HEATER TO PERMIT FULL OPENING OF THE ACCESS DOOR

THREADED MOUNTING HOLES

145/

211/

(TOP VIEW)

6 9

(152.4) 247.7) (50.8) (103.1)

(225.6) (371.6) (50.8) (130.3)

(368.3) (539.8) (56.0) (157.2)

MOUNTING ROD (4)

2 41/

2 51/

23/

BACK WALL

63/

Figure 2. Vertical Discharge Mounting and Rod Spacing

Vertical Discharge (Rod-Mount from Ceiling)

1. Remove bolts from the threaded holes in the back of the

heater.

2. Install four threaded mounting rods in the threaded holes and

and secure in place using lock nuts.

3. Securely attach the four mounting rods to the ceiling. (Refer

to Table 1 for wall and ceiling clearances, and Table 3 for mounting rod spacing dimensions.)

Wiring Branch Circuit (Power)

1. Connect heater only to the voltage, amperage and frequency

specified on the namep

2. Field wiring must be properly sized to carry the amperage in

accordance with the NEC.

3. The access door is hinged. There are either one or two screws

accessible from the side that must be loosened to gain access. These screws are the captive type; do not try to remove them.

4. A knockout is provided in the back of the heater close to the

power terminal block and the control terminal board. The contr

ol terminal board knockout is 1/2 inch (12.7 mm) conduit size. The power terminal block knockout is multiple diameter. Use the diameter that fits the required conduit size.

5. A ground terminal is provided near the power terminal board. The ground wire should be connected before other connections are made.

6. The power terminal block is equipped with box terminals sized to accept the correct size power supply wi wire rated min 600V, 60° C is acceptable for heaters rated up to 80 amps. For heaters rated more than 80 amps, branch circuit wire must be rated at least 75°C. Either aluminum or copper wire is satisfactory for connection to the heater power terminal block box terminal. Copper wire is recommended and must be used with built-in disconnect switch.

late.

re. Branch circuit

S I D E

W A L L

7. Each heater has a wiring diagram affixed to the inside of the

LEAD WIRE

3 PHASE BLOCK

access door. Consult this diagram before making any field connections.

Important Note - Installation Screw Lug Torque:

During transportation it is possible screw lug connections can loosen. After installation, before power is turned on to the heater, check all screw lug connections for tightness to a recommended minimum torque of 35 in-lbs. (3.9 N-m). Loose connections may present a hazard.

8. Single or three-phase power connections may be used with heater models HUHAA524FC, HUHAA520FC, HUHAA720FC, HUHAA724FC, HUHAA1024FC, HUHAA1020FC,

and HUHAA1520FC. These units are factory wired for single-phase operation. If these heaters are for use with three-phased power, reconnect the wires as indicated in the wiring diagram attached to the heater. the wi

ring illustrations in Figures 3a and 3b and following the

Additional information can be found by looking at

directions shown below.

On models HUHAA524FC, HUHAA520FC, HUHAA724FC, HUHAA720FC, HHUHAA1520FC, HUHAA1024FC,

and HUHAA1020FC, (Figure 3a), move only the two wires marked “A1”and marked “B1”; do not move or change any other wiring. The element lead wire marked “B1” which is factory connected

to the power terminal block (terminal located closest to the elements) must be moved to terminal “B” on the three-phase terminal block.

HEATER FRONT

"A1"

3 PHASE BLOCK

HEATER FRONT

LEAD WIRE

"A1"

LEAD WIRE

"B1"

TO ELEMENTS

CONTACTOR

(OR P2)

POWER TERMINAL BLOCK

ELEMENTS

LEAD WIRE

"B1"

TO ELEMENTS

CONTACTOR

(OR P2)

ELEMENTS

POWER TERMINAL BLOCK

FACTORY-WIRED FOR SINGLE-PHASE POWER FIELD-WIRED FOR THREE-PHASE POWER

Figure 3a. Wiring Connections for Single-Phase and Three-Phase Power(HUHAA524FC, HUHAA520FC, HUHAA724FC,

HUHAA720FC, HUHAA1024FC, HUHAA1020FC

3 PHASE BLOCK

FACTORY-WIRED FOR SINGLE-PHASE POWER

FIELD-WIRED FOR THREE-PHASE POWER

Figure 3b. Wiring Connections for Single-Phase and Three -Phase Power (HUHAA1520FC)

3 PHASE BLOCK

The relay (contactor) lead wire “A1” must be moved from the end terminal of the power terminal block (terminal closest to the contactor or control terminal board) to the “A” terminal of the lower terminal block (center terminal).

Model HUHAA1520FC (Figure 3b) has two three-phase terminal blocks located adjacent to the relays (contactors). Move only the two wires marked “C1” and “D1” on each of these two three-phase terminal blocks to terminal “B”. Do not move or change any other wires.

9. Electrical Accessories, either kits or factory-installed options, are shown connected by a dash line on the heater wiring diagram.

10. 208/240 VOLT HEATER: The heaters are wired for 240V from factory. When

heater is to be connected to 208V supply, the transformer leads MUST BE interchanged. For units rated 30/40kW or higher, interchange ORANGE and RED primary leads. The black colored lead is the COMMON for the transformer (50VA) provided with the high wattage units. For lower kW rated heaters, interchange BLACK and RED primary leads. The WHITE colored lead is the COMMON for the control transformer provided with these heaters. Always refer to the wiring diagram on the cover of the heater before making this reconnection of tranformer primary leads.

Control Wiring

LINE VOLTAGE IS PRESENT ON SOME OF THE TERMINALS ON THE CONTROL TERMINAL BOARD. ALWAYS DISCONNECT THE POWER FROM THE HEATER BEFORE MAKING ANY CONNECTIONS TO THE CONTROL BOARD TO PREVENT ELECTRIC SHOCK HAZARD.

1. Use min. 600 volts, NEC Class 1 insulated wire for all control circuit wiring.

2. Use a crimp-on type fork terminal on the wire ends that attach to the control terminal board if more than one connection is to be made under the terminal screw.

3. On units not

provided with internal contactor (3 & 5 KW),

refer to Figure 4 for wiring diagram.

NOTE: Thermostat and control circuit wiring must be suitable to handle the full load of the heater (example HUHAA520FC is rated 24amps)

4. On units provided with internal contactor (units rated 7 KW and higher) refer to Figure 5 for wiring diagram. Control wiring must be rated minimum 18 AWG.

OPERATING

CAUTION: To prevent a possible fire or damage to heater,

if a two stage thermostat is provided, it MUST be wired so Stage 1 turns the rear heating element (where fan control is located) on first and off last. Stage 2 MUST turn on elements other than the rear element as the need for additional heat is required and will turn on last and off first.

2-STAGE INTERNAL THERMOSTAT

MT-2

BLACK

MT-1

RED

BLACK

RED

F 2

F 1

IMPORTANT! FOR 2 STAGE THERMOSTATS, USE:

1. H1 AND P1 FOR STAGE 1 CONNECTIONS

2. H2 AND P2 FOR STAGE 2 CONNECTIONS

REMOTE SUMMER FAN SWITCH (MRFS-1) OR SUMMER FAN SWITCH MCFS (MANUAL)

INSTRUCTIONS

1. Heater must be properly installed before operation.

2. Turn power supply to heater “ON” at main switch panel.

3. Where applicable, refer to control accessory instructions

Figure 4. Control Terminal Board (for Heaters Without Contactors)

REMOTE SUMMER FAN

T R

F 1

F 2

SWITCH (MRFS-1)

SUMMER FAN SWITCH

FAN RELAY (FOR MRFS-2 AMD MHRT)

BLACK TO W1

MT-1

2-STAGE INTERNAL THERMOSTAT

RED TO R

MHRT HEAT RECOVERY THERMOSTAT OR REMOTE FAN SWITCH (MRFS-2)

RED

BLACK

MT-2

BLACK

RED

R W1

regarding proper operation of any controls or accessories used with the heater.

NOTES:

1. THIS STYLE CONTROL TERMINAL BOARD USED WITH MODELS HUHAA324FC, HUHAA327FC, HUHAA320FC, HUHAA524FC, HUHAA527FC, AND HUHAA520FC.

2. WHEN UNIT IS WIRED FOR SINGLE-PHASE, JUMPER H1 TO H2. IF SINGLEPOLE THERMOSTAT IS USED WITH SINGLE-PHASE UNIT, CONNECT THERMOSTAT LEADS TO P1 AND H1.

3. EXTERNAL LINE VOLTAGE THERMOSTATS SHOULD BE TREATED AS SINGLE STAGE ONLY.

NOTES:

1. THIS STYLE CONTROL TERMINAL BOARD USED WITH MODELS

EXCEPT HUHAA324FC, HUHAA327FC, HUHAA320FC, HUHAA524FC, HUHAA527FC, AND HUHAA520FC.

2. REMOVE JUMPER W1 TO W2 WHEN 2-STAGE THERMOSTAT IS USED.

3. *ONLY ONE OF THESE ACCESSORIES MAY BE INSTALLED IN A

SINGLE HEATER.

4. EXTERNAL LINE VOLTAGE THERMOSTATS SHOULD BE TREATED AS

SINGLE STAGE ONLY.

IMPORTANT! FOR 2 STAGE THERMOSTATS, USE:

1. W1 AND R FOR STAGE 1 CONNECTIONS

2. W2 AND R FOR STAGE 2 CONNECTIONS

Figure 5. Control Terminal Board (for Heaters With Contactors)

How to Reset Manual Reset Safety Limit (Factory Installed Option Only)

The manual reset switch is located internally on the rear of the heater. On the 3KW and 5KW models, the access to the reset button is on the right side (when facing rear of heater); on all other models it is near the top rear of the heater.

The manual reset limit is in series with the automatic recycling protector (limit). The manual reset limit will not reset until the heater has cooled and the button is pushed in.

DO NOT TAMPER WITH OR BYPASS ANY SAFETY LIMITS INSIDE HEATER.

CAUTION - DO NOT CONTINUE TO ATTEMPT TO USE THE HEATER IF THE SAFETY CONTROL REPEATEDLY OPERATES AFTER BEING RESET. TO DO SO COULD PERMANENTLY DAMAGE THE HEATER OR CREATE A FIRE OR SAFETY HAZARD.

It is important to keep this heater clean. Your heater will give you years of service and comfort with only minimum care. To assure efficient operation follow the simple instructions below.

ALL SERVICING BEYOND SIMPLE CLEANING THAT REQUIRES DISASSEMBLY SHOULD BE PERFORMED BY QUALIFIED SERVICE PERSONNEL.

MAINTENANCE INSTRUCTIONS

It is important to keep this heater clean. Your heater will give you

of service and comfort with only minimum care. To assure

years efficient operation follow the simple instructions below.

ALL SERVICING BEYOND SIMPLE CLEANING THAT REQUIRES DISASSEMBLY SHOULD BE PERFORMED BY QUALIFIED SERVICE PERSONNEL.

TO REDUCE RISK OF FIRE AND ELECTRIC SHOCK OR INJURY, DISCONNECT ALL POWER COMING TO HEATER AT MAIN SERVICE PANEL AND CHECK THAT THE ELEMENT IS COOL BEFORE SERVICING OR PERFORMING MAINTENANCE.

User Cleaning Instructions:

1. After the heater has cooled, a vacuum cleaner with brush attachment may be used to remove dust and lint from exterior surfaces of the heater including the grille openings.

2. With a damp cloth, wipe dust and lint from grille and exterior surfaces.

3. Return power to heater and check to make sure it is operating properly.

TO REDUCE RISK OF FIRE AND ELECTRIC SHOCK OR INJURY, DISCONNECT ALL POWER COMING TO HEATER AT MAIN SERVICE PANEL AND CHECK THAT THE ELEMENT IS COOL BEFORE SERVICING OR PERFORMING MAINTENANCE.

User Cleaning Instructions:

1. After the heater has cooled, a vacuum cleaner with brush attachment may be used to remove dust and lint from exterior surfaces of the heater

2. With a damp cloth, wipe dust and lint from grille and exterior surfaces.

3. Return power to heater and check to make sure it is operating properly.

including the grille openings.

Maintenance Cleaning Instructions:

(To be performed only by Qualified Service Personnel)

At least annually, the heater should be cleaned and serviced by a qualified service person to assure safe and efficient operation. This should include as necessary, vacuuming dust and debris from the elements and fan, and checking all screw lug connections for tightness to a recommended minimum torque of 35 inlbs. (3.9 N-m). After completing the cleaning and servicing, the heater should be fully reassembled and checked for proper operation.

HUHAA FC

Built-in Controls

Key No. Description Part Number

1 Thermostat, One Pole (MT-1) 5813-0036-000

Thermostat, Two Stage (MT-2) 5813-0035-000

2 Knob, Thermostat 3301-0060-000

3 Label, Thermostat 3502-1781-000

4 Screws, Fl. Hd., 6-32 x 1/4 5202-7009-021

5 Clip, Thermostat 1403-0041-000

6 Switch, 25A, OEM 5216-0132-000

Switch, 25A, K & N 5216-0204-000

Switch, 63A, OEM 5216-0131-000

Switch, 63A, K & N 5216-0203-000

Switch 25A, Electro 5216-0200-000

7 Screw, M4 x 10, Rd. Hd., (25A) —

Screw, 63A, M5 x 16, Rd. Hd. —

8 Knob, 25A, OEM “T1” OEM “T1”

Knob, 25A, K & N

Knob, 63A, OEM OEM “S4”

Knob, 63A, K & N

Knob, Electro EI 141747

9 Switch, Toggle, 600V 5216-0130-000

10 Relay, Fan, 24V Coil 5018-0008-000

11 Switch Assembly 5216-0199-000

12 Manual Reset Limit 4520-0012-000

K & N S1B 6001

K & N S2B G001

Heater Replacement Parts

Key No. Description Part Number

1 Spring, Element (used on 20kW and below only) 5208-0073-000

Spring, Element (used on 25kW and below only) 5208-0073-001 2 Spring, Capillary Tube 5208-0072-000 3 Spring, Element Retainer 5208-0074-000 4 Switch (used on 25kW thru 50kW only) 5216-7076-001 5 Insulator (used on 25kW thru 50kW only) 2900-0031-000 6 Bracket Extension

(used on 15kW, 20kW, 40kW and 50kW only) 1215-0282-000 7 Switch Bracket 1215-0256-000 8 Fan Delay 4520-0010-000

14 Speed Nut 4100-7036-026 15 Bracket, Captive Screw (used on 3kW thru 20kW only) 1215-0291-000

Bracket, Captive Screw (used on 25kW thru 50kW only) 1215-0289-000

17 Protector, Linear Limit (used on 3kW thru 5kW only) 4520-0011-000

Protector, Linear Limit (used on 7kW thru 20kW only) 4520-0011-001

Protector, Linear Limit (used on 25kW thru 50kW only) 4520-0011-002

20 Clamp (used on 20kW thru 50kW only) 1417-5004-000

Bracket, Mounting Capacitor (used on 20kW, 208v only) 1215-0314-000

22 Terminal Lug (used on 7kW thru 50kW only) 3504-7002-001 25 Bushing (used on 20kW thru 50kW only) 25221-60131 26 Washer, Ground (used on 3kW thru 5kW only) 6401-0084-000 27 Screw, Ground (used on 3kW thru 5kW only) 5202-0290-002 28 Louver (used on 3kW thru 5kW only) 3503-0036-000

Louver (used on 7kW thru 20kW only) 3503-0036-001

Louver (used on 25kW thru 50kW only) 3503-0036-002

29 Spring, Louver 5208-7005-001 32 Terminal Block, 3-Phase (used where models

can be 1 or 3 phase) 5823-0003-000

33 Terminal Doublers (used where required) 5819-7012-005

BUILT-IN CONTROLS — Made-to-Order Units Only

POWER

DISCONNECT

SWITCH

SINGLE-POLE

THERMOSTAT, TWO-STAGE

THERMOSTAT, HEAT

RECOVERY THERMOSTAT

SUMMER

FAN

SWITCH

25KW THRU 50KW ONLY

7KW THRU 20KW ONLY

3KW THRU 5KW ONLY

THESE PARTS ARE USED ON

FACTORY 2T OPTION ONLY

9 10 11 12 13 16 18 19 21

Model No. Back Case Transformer** Motor Fan Blade Cover Front Case Element Assy. Element Guard Capacitor

HUHAA324FC HUHAA348FC HUHAA327FC HUHAA320FC

HUHAA548FC HUHAA527FC

HUHAA724FC HUHAA720FC HUHAA748FC HUHAA727FC

HUHAA1024FC HUH

AA1027FC HUHAA1048FC HUHAA1020FC

HUHAA1524FC HUHAA1548FC HUHAA1520FC

HUHAA2024FC HUHAA2048FC HUHAA2020FC

HUHAA2524FC

HUHAA2548AFC

HUHAA3024FC

HUHAA3048AFC

HUHAA3020FC HUHAA4024FC

HUHAA4048FC

HUHAA5020FC HUH

AA5024FC HUHAA5048FC

1425-2004-000 – 3900-2002-006 1210-2000-000 1402-0336-001 1425-0009-015 1802-0087-000 2504-0011-000 – 1425-2004-000 5814-0003-002 3900-2005-000 1210-2000-000 1402-0336-001 1425-0009-015 1802-0087-002 2504-0011-000 – 1425-2004-000 – 3900-2002-007 1210-2000-000 1402-0336-001 1425-0009-015 1802-0087-001 2504-0011-000 – 1425-2004-000 – 3900-2002-006 1210-2000-000 1402-0336-001 1425-0009-015 1802-0087-024 2504-0011-000 –

1425-2004-000 5814-0003-002 3900-2005-000 1210-2000-000 1402-0336-001 1425-0009-015 1802-0087-005 2504-0011-000 – 1425-2004-000 – 3900-2002-007 1210-2000-000 1402-0336-001 1425-0009-015 1802-0087-004 2504-0011-000 –

1425-0010-004 5814-0003-000 3900-2014-002 1210-0090-000 1402-0339-002 1425-0009-016 1802-0087-006 2504-0013-001 – 1425-0010-004 5814-0003-000 3900-2014-001 1210-0090-000 1402-0339-002 1425-0009-006 1802-0087-031 2504-0013-001 – 1425-0010-004 5814-0003-002 3900-0347-005 1210-0090-000 1402-0339-002 1425-0009-016 1802-0087-008 2504-0013-001 – 1425-0010-004 5814-0003-001 3900-2014-003 1210-0090-000 1402-0339-002 1425-0009-016 1802-0087-007 2504-0013-001 –

1425-0010-004 5814-0003-000 3900-2014-002 1210-0090-000 1402-0339-002 1425-0009-016 1802-0087-031 2504-0013-001 – 1425-0010-004 5814-0003-001 3900-2014-003 1210-0090-000 1402-0339-002 1425-0009-016 1802-0087-010 2504-0013-001 1425-0010-004 5814-0003-002 3900-0347-005 1210-0090-000 1402-0339-002 1425-0009-016 1802-0087-011 2504-0013-001 – 1425-0010-004 5814-0003-000 3900-2014-001 1210-0090-000 1402-0339-002 1425-0009-016 1802-0087-036 2504-0013-001 –

1425-0014-000 5814-0003-000 3900-0361-000 1210-0090-001 1402-0339-003 1425-0009-017 1802-0087-012 2504-0012-001 – 1425-0014-000 5814-0003-002 3900-0361-001 1210-0090-001 1402-0339-003 1425-0009-017 1802-0087-013 2504-0012-001 – 1425-0014-000 5814-0003-000 3900-0361-002 1210-0090-001 1402-0339-003 1425-0009-017 1802-0087-031 2504-0012-001 –

1425-0013-000 5814-0003-000 3900-0362-000 1210-0096-000 1402-0339-003 1425-0009-017 1802-0087-014 2504-0012-001 1432-0002-003 1425-0013-000 5814-0003-002 3900-0362-001 1210-0096-000 1402-0339-003 1425-0009-017 1802-0087-015 2504-0012-001 1432-0002-003 1425-0013-000 5814-0003-000 3900-0362-002 1210-0096-000 1402-0339-003 1425-0009-017 1802-0087-026 2504-0012-001 1432-0002-003

1425-0011-003 5814-0003-000 3900-0364-000 1210-0098-000 1402-0340-002 1425-0012-007 1802-0087-016 2504-0014-001 1432-0002-001 1425-0011-003 5814-0003-002 3900-0363-001 1210-0098-000 1402-0340-002 1425-0012-007 1802-0087-017 2504-0014-001 1432-0002-003

1425-0011-003 5814-0003-000 3900-0364-000 1210-0098-000 1402-0340-002 1425-0012-007 1802-0087-018 2504-0014-001 1432-0002-001 1425-0011-003 5814-0003-002 3900-0363-000 1210-0098-000 1402-0340-002 1425-0012-007 1802-0087-019 2504-0014-001 1432-0002-003 1425-0011-003 5814-0003-000 3900-0364-000 1210-0098-000 1402-0340-002 1425-0009-017 1802-0087-028 2504-0014-001 1432-0002-001

1425-0011-001 5814-0003-000 3900-0350-000 1210-0097-000 1402-0340-003 1425-0012-006 1802-0087-020 2504-0015-001 1432-0002-004 1425-0011-001 5814-0003-002 3900-0350-001 1210-0097-000 1402-0340-003 1425-0012-006 1802-0087-021 2504-0015-001 1432-0002-004

1425-0011-001 5814-0003-000 3900-0350-000 1210-0097-000 1402-0340-003 1425-0012-006 1802-0087-022 2504-0015-001 1432-0002-004 1425-0011-001 5814-0003-000 3900-0350-000 1210-0097-000 1402-0340-003 1425-0012-006 1802-0087-022 2504-0015-001 1432-0002-004 1425-0011-001 5814-0003-002 3900-0350-001 1210-0097-000 1402-0340-003 1425-0012-006 1802-0087-023 2504-0015-001 1432-0002-004

–

23 24 30 31 34 35

Model No. Relay*** Insulator Terminal Block, Power Terminal Block, Control Fuse Block Fuse

HUHAA324FC –– 5823-0004-000 5823-0001-000 – – HUHAA348FC 5018-0004-100 2900-0030-000 5823-0004-000 5823-0002-000 – – HUHAA327FC – 2900-0030-000 5823-0004-000 5823-0001-000 – – HUHAA320FC –– 5823-0004-000 5823-0001-000 – –

HUHAA548FC 5018-0004-100 2900-0030-000 5823-0004-000 5823-0002-000 – – HUHAA527FC – 2900-0030-000 5823-0004-000 5823-0001-000 – –

HUHAA720FC HUHAA724FC 5018-0003-000 5823-0004-000 5823-0002-000 HUHAA748FC 5018-0004-100 2900-0030-000 5823-0004-000 5823-0002-000 – – HUHAA727FC 5018-0004-100 2900-0030-000 5823-0004-000 5823-0002-000 – –

HUHAA1024FC HUH 5018-0003-000 2900-0030-000 5823-0004-000 5823-0002-000AA1027FC HUHAA1048FC HUHAA1020FC

HUHAA1524FC HUHAA1548FC HUHAA1520FC

HUHAA2024FC HUHAA2048FC HUHAA2020FC

HUHAA2524FC HUHAA2548FC

HUHAA3024FC HUHAA3048AFC HUHAA3020FC

HUHAA4024FC HUHAA4048FC

HUHAA5020FC HUH 5018-0006-000 5823-0005-000 5823-0002-000 2025-7002-000 2019-7008-080AA5020FC HUHAA5048FC

* Two relays are used: 35A relay P/N 5018-0004-000 and 40A relay P/N 5018-0006-000.

** 24V secondary shown. For 120V secondary, increase last digit by 3. (i.e. for MUHAA348FC, 24V secondary use 5814-0003-002; for 120V secondary use 5814-0003-005.)

*** 24V H.C. shown. For 120 H.C., increase last digit by 1. (i.e.: for HUHAA348FC, 24V H.C. use 5018-0004-000; for 120V H.C. use 5018-0004-001.)

5018-0003-000 –

5018-0003-000 – 5823-0004-000 5823-0002-000 –

5018-0004-100 2900-0030-000 5823-0004-000 5823-0002-000 – – 5018-0004-100 – 5823-0004-000 5823-0002-000 – –

5018-0005-004 – 5823-0004-001 5823-0002-000 – – 5018-0004-100 2900-0030-000 5823-0004-000 5823-0002-000 – – 5018-0005-008 – 5823-0004-003 5823-0002-000 2025-0002-000 2019-0007-010

5018-0006-000 – 5823-0004-002 5823-0002-000 – – 5018-0004-100 2900-0030-000 5823-0004-000 5823-0002-000 – – 5018-0005-000 – 5823-0004-002 5823-0002-000 2025-0002-000 2019-0007-008

5018-0005-004 – 5823-0004-002 5823-0002-000 2025-7002-000 2019-7008-077 5018-0005-004 2900-0030-000 5823-0004-001 5823-0002-000 – –

5018-0005-004 – 5823-0004-003 5823-0002-000 2025-7002-000 2019-7008-079 5018-0005-004 2900-0030-000 5823-0004-001 5823-0002-000 – – 5018-0006-000 – 5823-0005-000 5823-0002-000 2025-7002-000 2019-7008-080

5018-0005-004 – 5823-0005-000 5823-0002-000 2025-7002-000 2019-7008-079

* 2900-0030-000 5823-0004-002 5823-0002-000 2025-7002-000 2019-7008-079

5018-0005-004 –

* 2900-0030-000 5823-0004-002 5823-0002-000 – –

–

5823-0004-000 5823-0002-000 – –

5823-0005-000 5823-0002-000 2025-7002-000 2019-7008-080

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