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

HUHAAFC Series

Modular Unit Heaters

Installation, Operation & Maintenance Instructions

Specifications

	Basic Model	Height	Width	Depth			Mounting	Wiring
							Weight	Compartment
	No.	in (mm)	in. (mm)	in. (mm)			lbs. (kg)	Volume
	HUHAA320FC						27 (12.2)
	HUHAA324FC						27 (12.2)
	HUHAA327FC						27 (12.2)
	HUHAA348FC	16	14	71/2			30 (13.6)	90 in3
	HUHAA520FC	(406.4)	(355.6)	(190.5)			27 (12.2)	(14.70 cm3)
	HUHAA524FC						27 (12.2)
	HUHAA527FC						27 (12.2)
	HUHAA548FC						30 (13.6)
	HUHAA724FC						38 (17.2)
							38 (17.2)
	HUHAA720FC
							38 (17.2)
	HUHAA727FC							100 in3
		3	19	7	1	/2	38 (17.2)
	HUHAA748FC
		21 /4						(1639 cm3)
		(552.5)	(482.6)	(190.5)
							38 (17.2)
	HUHAA1020FC
							38 (17.2)
	HUHAA1024FC
							38 (17.2)
	HUHAA1027FC
							38 (17.2)
	HUHAA1048FC

	Basic Mode	Height	Width	Depth	Mounting	Wiring
					Weight	Compartment
	No.	in (mm)	in. (mm)	in. (mm)	lbs. (kg)	Volume
	HUHAA1520FC				54 (24.5)
	HUHAA1524FC				50 (22.7)
	HUHAA1548FC	213/4	19	12 3/4	50 (22.7)	140 in3
	HUHAA2020FC	(552.5)	(482.6)	(323.9)	60 (27.2)	(2295 cm3)
	HUHAA2024FC				55 (24.9)
	HUHAA2048FC				55 (24.9)
	HUHAA2524FC				89 (40.4)
	HUHAA2548AFC	30	265/8	113/4	89 (40.4)	504 in3
	HUHAA3020FC				89 (40.4)
		(76.2)	(676.4)	(298.5)		(8260 cm3)
	HUHAA3024FC				89 (40.4)
	HUHAA3048AFC				89 (40.4)
	HUHAA4024FC				119 (54.0)
	HUHAA4048FC	30	265/8	171/4	119 (54.0)	648 in3
	HUHAA5024FC	(76.2)	(676.4)	(435.1)	119 (54.0)	(10620 cm3)
	HUHAA5020FC				119 (54.0)
	HUHAA5048FC				119 (54.0)

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	4.	To reduce the risk of fire, do not store or use gasoline or
	heater, adhere to the following:		other flammable vapors and liquids in the vicinity of the
	1. Disconnect all power coming to heater at main service panel		heater.
		5.	The ceiling or wall mounting structure and the anchoring
	before wiring or servicing.
	Important Note: This heater must be installed by a qualified		provisions must be of sufficient strength to support the com-
			bined weight of the heater and mounting bracket.
	person.
		6.	All built-in thermostats: if the heater is used to prevent pip-
	2. All wiring procedures and connections must be in accor-
			ing or	liquids from freezing, and if the thermostat is set
	dance with the National and Local Codes having jurisdiction
			below 45° f (7°C), the fan must run continuously.
	and the heater must be grounded.
		7.	The heater must be mounted at least 7’ (2134 mm) above
	3. Verify the power supply voltage coming to heater matches
			the floor to avoid accidental contact with the fan blade which
	the ratings as shown on the heater nameplate.
			could cause injury.
	CaUtION: ENERgiziNg HEATER AT A VoLTAgE gREATER	8.	Keep at least 5’ clearance in front of the heater. Refer to
	THAN THE VoLTAgE pRiNTED oN THE NAMEpLATE wiLL		Table 1 for side, top and back clearance requirements.
	DAMAgE THE HEATER AND VoiD THE wARRANTy AND	9.	Do not	mount mercury type thermostat directly on unit.
	CoULD CAUsE A fiRE.
			Vibration could cause heater to malfunction.

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.

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 capacity 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.

2

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 threaded rods. (Refer to Table 2 for threaded 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
	3 & 5 kW	Horiz.	2 (50.8)	6 (152.4)	9 (228.6)
		Vert.	6 (152.4)	18 (457.2)	18 (457.2)
	7.5 to 10 kW	Horiz.	6 (152.4)	6 (152.4)	13 (330.2)
		Vert.	6 (152.4)	24 (609.6)	24 (609.6)
	15 to 20 kW	Horiz.	6 (152.4)	9 (228.6)	121/2 (317.5)
		Vert	6 (152.4)	24 (609.6)	24 (609.6)
	25 to 50 kW	Horiz.	16 (406.4)	12 (304.8)	181/2 (470.0)
		Vert.	12 (304.8)	36 (914.4)	39 (914.4)
		CEILING		BACK WALL
	MOUNTING		THREADED
	ROD		HOLES	B	D
			MOUNTING
					S
	LOCK NUT				I
					D
	B				E
					W
	A
	C		A		A
	K				L
	W				L
	A
	L
	L
					C
			UNIT HEATER	(TOP VIEW)

Figure 1. Horizontal Discharge Mounting and Spacing.

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

	Unit	Rod Thread		A		B	C	D
		Type
3	- 5 kW					6	41/16	3/4
				61/16		(152.4)	(103.1)	(19.0)
				(153.9)
7.5 - 10 kW		5/16 - 18				87/8	51/8	3/4
15	- 20 kW			113/8		(225.6)	(130.3)	(19.0)
				(289.0)
25	- 30 kW			109/16		14 - 12	63/16	5/8
				(268.2)		(368.3)	(157.2)	(16.0)
		3/8 - 16
40	- 50 kW			1515/16		14 - 12	63/16	5/8
				(404.9)		(368.3)	(157.2)	(16.0)

Horizontal Discharge (Rod-mount from Ceiling)

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

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

	Unit	Rod Thread	E	F	G	H
		Type
	3 - 5 kW		6	93/4	2	41/16
			(152.4)	247.7)	(50.8)	(103.1)
		5/16 - 18
	7.5 - 20 kW		87/8	145/8	2	51/8
			(225.6)	(371.6)	(50.8)	(130.3)
	25 - 30 kW	3/8 - 16	141/2	211/4	23/16	63/16
			(368.3)	(539.8)	(56.0)	(157.2)

	CEILING
ACCESS	LOCK NUT
DOOR

B

A

C

K

W

A

L

L

CLEARANCE EQUAL TO WIDTH OF

HEATER TO PERMIT FULL OPEN-

ING OF THE ACCESS DOOR

		BACK WALL
		E
MOUNTING
ROD (4)	G		S
			I
			D
	THREADED		E
	MOUNTING		W
	HOLES	F
			A
			L
			L

(TOP VIEW)

H

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 nameplate.

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 control 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 wire. Branch circuit 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.

3

7.Each heater has a wiring diagram affixed to the inside of the 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. Additional information can be found by looking at the wiring illustrations in Figures 3a and 3b and following the 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				LEAD WIRE		3 PHASE BLOCK
				"A1"

TO ELEMENTS	B
	A
		ELEMENTS
CONTACTOR		LEAD WIRE
	POWER TERMINAL BLOCK	"B1"
(OR P2)

FACTORY-WIRED FOR SINGLE-PHASE POWER

HEATER FRONT	LEAD WIRE	3 PHASE BLOCK
	"A1"

		LEAD WIRE
		"B1"
	TO ELEMENTS	B
		A
		ELEMENTS

	CONTACTOR	POWER TERMINAL BLOCK
	(OR P2)

FIELD-WIRED FOR THREE-PHASE POWER

Figure 3a. Wiring Connections for Single-Phase and Three-Phase Power(HUHAA524FC, HUHAA520FC, HUHAA724FC, HUHAA720FC, HUHAA1024FC, HUHAA1020FC

B	C	D	D	C
			1
				1
		3 PHASE BLOCK
			D	C
				1
B	C	D	1

3 PHASE BLOCK

B	C	D	D	C
			1
				1
		3 PHASE BLOCK
			D	C
				1
B	C	D	1

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)

4

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.

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

REMOTE SUMMER RED FAN SWITCH (MRFS-1)

OR SUMMER FAN SWITCH MCFS (MANUAL)

MT-2
BLACK
H1	H2	F2	S
RED
BLACK
P1	P2	F1

MT-1

IMPORTANT! FOR 2 STAGE THERMOSTATS, USE:

1. H1 AND P1 FOR STAGE 1 CONNECTIONS 2. H2 AND P2 FOR STAGE 2 CONNECTIONS

OPERATING

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 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.

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

S	REMOTE SUMMER FAN
	SWITCH (MRFS-1)

RED

BLACK TO W1

BLACK FAN RELAY

(FOR MRFS-2 AMD MHRT)

T	T
MT-1	MT-2
	2-STAGE				TR
	INTERNAL					S
	THERMOSTAT
		BLACK	G			SUMMER
		RED		W2	F1
						FAN
	RED TO R					SWITCH
	MHRT HEAT RECOVERY	C	R	W1	F2
	THERMOSTAT OR
	REMOTE FAN	T
	SWITCH (MRFS-2)

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)

5

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.

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.

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.

MAINTENANCE

INSTRUCTIONS

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.

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.

6

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	K & N S1B 6001
	Knob, 63A, OEM	OEM “S4”
	Knob, 63A, K & N	K & N S2B G001
	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

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
				SINGLE-POLE
				THERMOSTAT,TWO-STAGE
				THERMOSTAT, HEAT
				RECOVERY THERMOSTAT
	3	4			5
2
		1
					12
POWER					SUMMER
DISCONNECT					FAN
SWITCH				10	SWITCH
			8		11
					9
			7
		6			9

7

25KW THRU 50KW ONLY

7KW THRU 20KW ONLY

3KW THRU 5KW ONLY

THESE PARTS ARE USED ON FACTORY 2T OPTION ONLY

8

	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	1425-2004-000	–	3900-2002-006	1210-2000-000	1402-0336-001	1425-0009-015	1802-0087-000	2504-0011-000	–
HUHAA348FC	1425-2004-000	5814-0003-002	3900-2005-000	1210-2000-000	1402-0336-001	1425-0009-015	1802-0087-002	2504-0011-000	–
HUHAA327FC	1425-2004-000	–	3900-2002-007	1210-2000-000	1402-0336-001	1425-0009-015	1802-0087-001	2504-0011-000	–
HUHAA320FC	1425-2004-000	–	3900-2002-006	1210-2000-000	1402-0336-001	1425-0009-015	1802-0087-024	2504-0011-000	–
HUHAA548FC	1425-2004-000	5814-0003-002	3900-2005-000	1210-2000-000	1402-0336-001	1425-0009-015	1802-0087-005	2504-0011-000	–
HUHAA527FC	1425-2004-000	–	3900-2002-007	1210-2000-000	1402-0336-001	1425-0009-015	1802-0087-004	2504-0011-000	–
HUHAA724FC	1425-0010-004	5814-0003-000	3900-2014-002	1210-0090-000	1402-0339-002	1425-0009-016	1802-0087-006	2504-0013-001	–
HUHAA720FC	1425-0010-004	5814-0003-000	3900-2014-001	1210-0090-000	1402-0339-002	1425-0009-006	1802-0087-031	2504-0013-001	–
HUHAA748FC	1425-0010-004	5814-0003-002	3900-0347-005	1210-0090-000	1402-0339-002	1425-0009-016	1802-0087-008	2504-0013-001	–
HUHAA727FC	1425-0010-004	5814-0003-001	3900-2014-003	1210-0090-000	1402-0339-002	1425-0009-016	1802-0087-007	2504-0013-001	–
HUHAA1024FC	1425-0010-004	5814-0003-000	3900-2014-002	1210-0090-000	1402-0339-002	1425-0009-016	1802-0087-031	2504-0013-001	–
HUHAA1027FC	1425-0010-004	5814-0003-001	3900-2014-003	1210-0090-000	1402-0339-002	1425-0009-016	1802-0087-010	2504-0013-001	–
HUHAA1048FC	1425-0010-004	5814-0003-002	3900-0347-005	1210-0090-000	1402-0339-002	1425-0009-016	1802-0087-011	2504-0013-001	–
HUHAA1020FC	1425-0010-004	5814-0003-000	3900-2014-001	1210-0090-000	1402-0339-002	1425-0009-016	1802-0087-036	2504-0013-001	–
HUHAA1524FC	1425-0014-000	5814-0003-000	3900-0361-000	1210-0090-001	1402-0339-003	1425-0009-017	1802-0087-012	2504-0012-001	–
HUHAA1548FC	1425-0014-000	5814-0003-002	3900-0361-001	1210-0090-001	1402-0339-003	1425-0009-017	1802-0087-013	2504-0012-001	–
HUHAA1520FC	1425-0014-000	5814-0003-000	3900-0361-002	1210-0090-001	1402-0339-003	1425-0009-017	1802-0087-031	2504-0012-001	–
HUHAA2024FC	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
HUHAA2048FC	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
HUHAA2020FC	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
HUHAA2524FC	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
HUHAA2548AFC	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
HUHAA3024FC	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
HUHAA3048AFC	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
HUHAA3020FC	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
HUHAA4024FC	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
HUHAA4048FC	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
HUHAA5020FC	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
HUHAA5024FC	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
HUHAA5048FC	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	5018-0003-000	–	5823-0004-000	5823-0002-000	–	–
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	5018-0003-000	–	5823-0004-000	5823-0002-000	–	–
HUHAA1027FC	5018-0003-000	2900-0030-000	5823-0004-000	5823-0002-000	–	–
HUHAA1048FC	5018-0004-100	2900-0030-000	5823-0004-000	5823-0002-000	–	–
HUHAA1020FC	5018-0004-100	–	5823-0004-000	5823-0002-000	–	–
HUHAA1524FC	5018-0005-004	–	5823-0004-001	5823-0002-000	–	–
HUHAA1548FC	5018-0004-100	2900-0030-000	5823-0004-000	5823-0002-000	–	–
HUHAA1520FC	5018-0005-008	–	5823-0004-003	5823-0002-000	2025-0002-000	2019-0007-010
HUHAA2024FC	5018-0006-000	–	5823-0004-002	5823-0002-000	–	–
HUHAA2048FC	5018-0004-100	2900-0030-000	5823-0004-000	5823-0002-000	–	–
HUHAA2020FC	5018-0005-000	–	5823-0004-002	5823-0002-000	2025-0002-000	2019-0007-008
HUHAA2524FC	5018-0005-004	–	5823-0004-002	5823-0002-000	2025-7002-000	2019-7008-077
HUHAA2548FC	5018-0005-004	2900-0030-000	5823-0004-001	5823-0002-000	–	–
HUHAA3024FC	5018-0005-004	–	5823-0004-003	5823-0002-000	2025-7002-000	2019-7008-079
HUHAA3048AFC	5018-0005-004	2900-0030-000	5823-0004-001	5823-0002-000	–	–
HUHAA3020FC	5018-0006-000	–	5823-0005-000	5823-0002-000	2025-7002-000	2019-7008-080
HUHAA4024FC	5018-0005-004	–	5823-0005-000	5823-0002-000	2025-7002-000	2019-7008-079
HUHAA4048FC	*	2900-0030-000	5823-0004-002	5823-0002-000	2025-7002-000	2019-7008-079
HUHAA5020FC	5018-0005-004	–	5823-0005-000	5823-0002-000	2025-7002-000	2019-7008-080
HUHAA5020FC	5018-0006-000	–	5823-0005-000	5823-0002-000	2025-7002-000	2019-7008-080
HUHAA5048FC	*	2900-0030-000	5823-0004-002	5823-0002-000	–	–

*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.)

9