Berko HUHAA520 Installation and operating instructions

HUHAA Series
Modular Unit Heaters
Dear Owner,
Congratulations! Thank you for purchasing this new heater manufactured by a division of Marley
Engineered roducts. You have made a wise investment selecting the highest quality product in the heat-
ing industry. lease carefully read and follow the installation and maintenance directions shown in this
manual. You should enjoy years of efficient heating comfort with this product from Marley Engineered
roducts... the industry’s leader in design, manufacturing, quality and service.
... The Employees of
Marley Engineered roducts
Read Carefully - These instructions are written to help
you prevent difficulties that might arise during installation
of heaters. Studying the instructions first may save you
considerable time and money later. Observe the following
procedures, and cut your mounting time to a minimum.
1. To prevent electrical shock, disconnect all power coming to
heater at main service panel before wiring or servicing.
2. ll wiring must be in accordance with the National and Local
Electrical Codes and the heater must be grounded as a pre-
caution against possible electric shock.
3. Verify the power supply voltage coming to heater matches the
ratings printed on the heater nameplate before energizing.
4. This heater is hot when in use. To avoid burns, do not let bare
skin touch hot surfaces.
5. 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.
6. To prevent a possible fire, do not block air intakes or exhaust
in any manner. Keep combustible materials, such as crates,
drapes, etc., away from heater. Do not install behind door,
furniture, towels, or boxes.
7. heater has hot and arcing or sparking parts inside. Do not
use it in areas where gasoline, paint or flammable liquids are
stored.
8. Use this heater only as described in this manual. ny other
use not recommended by the manufacturer may cause fire,
electric shock, or injury to persons.
9. This heater is not approved for use in corrosive atmospheres
such as marine, green house or chemical storage areas.
Installation & Maintenance Instructions
FILE #E21609
SAVE THESE INSTRUCTIONS
!
1
WARNING

HEATER LOCATION INSTRUCTIONS
rrange units so their 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 of posts, 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 capac-
ity of units will be determined by volume of building and square
feet of floor area to be heated. rrange units to provide perime-
ter 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 dis-
charge by the use of threaded rods. (Refer to Table 2 for thread-
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 HUH B or
HCMB) which permits horizontal pivoting of the heater.
fter 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.
DO NOT MOUNT MERCURY TYPE THERMOST T
DIRECTLY ON UNIT. VIBR TION COULD C USE
HE TER TO M LFUNCTION.
MANUAL RESET LIMIT (F CTORY INST LLED
OPTION ONLY.) THE LIMIT SWITCH IS LOC TED INTER-
N LLY ON THE RE R OF THE HE TER. ON THE 3KW
ND 5KW MODELS, THE CCESS TO THE RESETBUTTON
IS ON THE RIGHT SIDE (WHEN F CING RE R OF
LL BUILT-IN THERMOST TS: IF THE HE TER IS USED TO
PREVENT PIPING OR LIQUIDS FROM FREEZING, ND IF
THE THERMOST T IS SET BELOW 45° F (7°C), THE F N
MUST RUN CONTINUOUSLY.
CAUTION
TO PREVENT POSSIBLE OVERHE TING OR D M GE
DUE TO OVERHE TING, KEEP T LE ST 5' (1524mm)
CLE R NCE IN FRONT OF HE TER. REFER TO T BLE 1
FOR SIDE, TOP, ND B CK CLE R NCE REQUIREMENTS.
THE HE TER MUST BE MOUNTED T LE ST 7' (2134mm)
BOVE THE FLOOR TO PREVENT CCIDENT L CONT CT
WITH THE F N BL DE WHICH COULD C USE INJURY.
CAUTION
THE CEILING MOUNTING STRUCTURE ND THE
NCHORING PROVISIONS MUST BE OF SUFFI-
CIENT STRENGTH TO SUPPORT THE COMBINED
WEIGHT OF THE HE TER ND MOUNTING BR CKET.
(SEE T BLE 4).
HE TER); ON LL OTHER MODELS IT IS NE R THE
TOP RE R OF THE HE TER.
THE M NU L RESET LIMIT IS IN SERIES WITH THE
UTOM TIC RECYCLING PROTECTOR (LIMIT). THE
M NU L RESET LIMIT WILL NOT RESET UNTIL THE
HE TER H S COOLED ND THE BUTTON IS PUSHED
IN.
IMPORTANT !
2
!!
CAUTION !CAUTION !

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).
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 frequen-
cy 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 bottom, that must be removed
to gain access.
4. 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) con-
duit size. The power terminal block knockout is multiple
diameter. Use the diameter that fits the required conduit
size.
5. ground terminal is provided near the power terminal
board. The ground wire should be connected before other
connections are made.
6. The power terminal board is equipped with box terminals
sized to accept the correct size power supply wire. Wire
rated at 600 V and 60° C is satisfactory for the heater
branch circuit. Either aluminum or copper wire is satisfac-
tory for connection to the heater power terminal board box
terminal. Copper wire is recommended and must be used
with built-in disconnect switch.
Table 2. Rod Thread and Spacing Dimensions, inches (mm)
for Horizontal Discharge
Rod Thread
Unit Type A B C D
3 - 5 kW 64
1/16 3/4
61/16 (152.4) (103.1) (19.0)
7.5 - 10 kW (153.9)
15 - 20 kW
5/16 - 18
113/887/851/83/4
(289.0) (225.6) (130.3) (19.0)
25 - 30 kW 109/16 14 1/263/16 5/8
(268.2) (368.3) (157.2) (16.0)
40 - 50 kW
3/8- 16 1515/16 14 1/263/16 5/8
(404.9) (368.3) (157.2) (16.0)
Figure 2. Vertical Discharge Mounting and Rod Spacing
Table 3. Rod Thread Type and Spacing Dimensions, inches
(mm) for Vertical Discharge
Rod Thread
Unit Type E F G H
3 - 5 kW 69
3/424 1/16
5/16 - 18 (152.4) 247.7) (50.8) (103.1)
7.5 - 20 kW 87/8145/825
1/8
(225.6) (371.6) (50.8) (130.3)
25 - 30 kW 3/8- 16 141/2211/423/16 63/16
(308.1) (539.8) (55.6) (157.2)
3
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 10 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) 36 (914.4)
Table 1. Wall and Ceiling Clearance, inches (mm)
Figure 1. Horizontal Discharge Mounting and Spacing.

4
7. Each heater has a wiring diagram affixed to the inside of
the access door. Consult this diagram before making
any field connections.
8. Single or three-phase power connections may be used
with heater models HUH 520, HUH 524,
HUH 720, HUH 724, HUH 1020, HUH 1024
and HUH 1520. These units are factory wired for sin-
gle 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. dditional
information can be found by looking at the wiring illus-
trations in Figures 3a and 3b and following the directions
shown below.
On models HUH 520, HUH 524, HUH 720,
HUH 724, HUH 1020 and HUH 1024 (Figure 3a),
move only the two wires marked “ 1” and marked “B1”; do
not move or change any other wiring. The element lead wire
marked “B1” which is factory connected to the power termi-
nal block (terminal located closest to the elements) must be
moved to terminal “B” on the three-phase terminal block.
The relay (contactor) lead wire “ 1” must be moved from the
end terminal of the power terminal block (terminal closest to
the contactor or control terminal board) to the “ ” terminal of
the lower terminal block (center terminal).
Model HUH 1520 (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 ccessories, either kits or factory-installed
options, are shown connected by a dashed line on the
heater wiring diagram.
10. 208/240 VOLT HEATER. Interchange transformer red
and black primary leads (see wiring diagram) when the
heater is to be connected to 208 volts supply.

5
B
LEAD WIRE
"B1"
ELEMENTS
CONTACTOR
(OR P2) POWER TERMINAL BLOCK
HEATER FRONT LEAD WIRE
"A1" 3 PHASE BLOCK
TO ELEMENTS
B
LEAD WIRE
"B1"
ELEMENTS
CONTACTOR
(OR P2) POWER TERMINAL BLOCK
HEATER FRONT LEAD WIRE
"A1" 3 PHASE BLOCK
TO ELEMENTS
FACTORY-WIRED FOR SINGLE-PHASE POWER FIELD-WIRED FOR THREE-PHASE POWER
B
3 PHASE BLOCK
FACTORY-WIRED FOR SINGLE-PHASE POWER
C1
D1
D1
C1
C D
B
C D
3 PHASE BLOCK
B
3 PHASE BLOCK
FIELD-WIRED FOR THREE-PHASE POWER
C1
D1
D1
C1
C D
B
C D
3 PHASE BLOCK
Wiring Connections for Single-Phase and Three Phase Power
(HUH 520, HUH 524, HUH 720, HUH 724, HUH 1020 and HUH HUH 1024)
Wiring Connections for Single-Phase and Three Phase Power (HUHAA1520)
Figure 3a.
Figure 3b.

6
CONTROL WIRING
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 HUH 520 is
rated 24 amps)
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 WG.
LINE VOLT GE IS PRESENT ON SOME OF THE TERMI-
N LS ON THE CONTROL TERMIN L BO RD. LW YS
DISCONNECT THE POWER FROM THE HE TER BEFORE
M KING NY CONNECTIONS TO THE CONTROL BO RD
TO PREVENT ELECTRIC SHOCK H Z RD.
MT-1
MT-2
2-ST GE
INTERN L
THERMOST T
BL CK
RED
RED
BL CK
P2
H2
F 1
F 2 S
REMOTE SUMMER
F N SWITCH (MRFS-1)
OR SUMMER F N
SWITCH MCFS (M NU L)
P1
H1
REMOTE SUMMER FAN
SWITCH(HUHAARFS-1)OR
SUMMER FAN SWITCH
HUHAAFS (MANUAL)
HUHAA MT-2
HUHAA MT-1
Figure 4. Control Terminal Board
(for Heaters Without Contactors)
Mounting
Basic Model Height Width Depth Weight
No. in (mm) in. (mm) in. (mm) lbs. (kg)
!
Table 4. Specifications
HUH 320
HUH 324
HUH 327
HUH 348
HUH 520
HUH 524
HUH 527
HUH 548
HUH 720
HUH 724
HUH 727
HUH 748
HUH 1020
HUH 1024
HUH 1027
HUH 1048
HUH 1520
HUH 1524
HUH 1548
HUH 2020
HUH 2024
HUH 2048
HUH 2524
HUH 2548
HUH 3020
HUH 3024
HUH 3048
HUH 4024
HUH 4048
HUH 5020
HUH 5024
HUH 5048
16
(406.4)
21-3/4
(552.5)
21-3/4
(552.5)
30
(76.2)
30
(76.2)
14
(355.6)
19
(482.6)
19
(482.6)
26-5/8
(676.4)
26-5/8
(676.4)
8-1/2
(214.4)
8-1/2
(214.4)
13-3/4
(346.8)
13-3/4
(346.8)
18-1/8
(457.2)
27 (12.2)
27 (12.2)
27 (12.2)
27 (12.2)
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)
53 (24.0)
53 (24.0)
53 (24.0)
60 (27.2)
60 (27.2)
60 (27.2)
93 (42.3)
93 (42.3)
93 (42.3)
93 (42.3)
93 (42.3)
119 (54.0)
119 (54.0)
119 (54.0)
119 (54.0)
119 (54.0)
WARNING
NOTES:
1. THIS STYLE CONTROL TERMIN L BO RD
USED WITH MODELS HUH 320,
HUH 324, HUH 327, HUH 520,
HUH 524, HUH 527.
2. WHEN UNIT IS WIRED FOR SINGLE PH SE,
JUMPER H1 TO H2. IF SINGLE POLE
THERMOST T IS USED WITH SINGLE PH SE
UNIT, CONNECT THERMOST T LE DS TO
P1 ND H1.
3. EXTERN L LINE VOLT GE THERMOST TS
SHOULD BE TRE TED S SINGLE ST GE
ONLY.

MODEL NO. HUHAA324 D TE CODE 0395
MFG. NO.
VOLTS C KILOW TTS PH SE
60 HZ
208 / 240 2.2 /3 1
MOTOR CONTROL
V C MP V C
208/240 .25 208/240
IR MINIMUM MOUNTING CLE R NCE
FLOW SIDE B CK CEILING FLOOR
HORIZ. 6" 9.5" 2" 7'
VERT. 18" 18" 6" 7'
WARNING: DO NOT TURN LOUVERS BOVE LEVEL OF THE UNIT.
DISCONNECT POWER BEFORE SERVICING. IF EXTERN L CONTROL IS
USED, LSO DISCONNECT EXTERN L POWER SUPPLY.
M RLEY ENGINEERED PRODUCTS
BENNETTSVILLE, SC 29512 4104-2088-001
NAMEPLATE
774G LISTED
ROOM HE TER
7
IMPORTANT INFORMATION
TT
MT-1 MT-2
BLACK TO W1
RED TO R
2-STAGE
INTERNAL
THERMOSTAT
MHRT HEAT RECOVERY
THERMOSTAT OR
REMOTE FAN
SWITCH (MRFS-2)
BLACK
RED
RED
BLACK
CRW1
W2
F2
F1
G
TR
T
S
S
REMOTE SUMMER FAN
SWITCH (MRFS-1)
FAN RELAY
(FOR MRFS-2 AMD MHRT)
SUMMER
FAN
SWITCH
REMOTE SUMMER FAN
SWITCH (HUHAARFS1)
FAN RELAY
FOR (HUHAARFS2 AND HUHAAHRT)
(HUHAAHRT)HEATRECOVERY
THERMOSTAT OR REMOTE
FAN SWITCH (HUHAARFS2)
HUHAA MT-1 HUHAA MT-2
Figure 5. Control Terminal Board (for Heaters With Contactors)
NOTES:
1. THIS STYLE CONTROL TERMIN L BO RD USED
WITH MODELS EXCEPT HUH 320, HUH 324,
HUH 327, HUH 520, HUH 524, HUH 527.
.2. REMOVE JUMPER W1 TO W2 WHEN 2-ST GE THER-
MOST T IS USED.
3. *ONLY ONE OF THESE CCESSORIES M Y BE
INST LLED IN SINGLE HE TER.
4. EXTERN L LINE VOLT GE THERMOST TS SHOULD
BE TRE TED S SINGLE ST GE ONLY.

HOW TO ORDER REPAIR PARTS
In order to obtain any needed repair or replacement
parts, warranty service or technical information, please
contact Marley Engineered Products Service Center toll-
free by calling 1-800-642-HE T.
When ordering repair parts, always give the informa-
tion listed as follows:
1. The Part Number
2. The Model Number
3. The Part Description
4. Date of Manufacture
LIMITED WARRANTY
ll products manufactured by Marley Engineered Products are warranted against defects in workmanship and mate-
rials for one year from date of installation, except heating elements which are warranted against defects in work-
manship and materials for five years from date of installation. This warranty does not apply to damage from accident,
misuse, or alteration; nor where the connected voltage is more than 5% above the nameplate voltage; nor to equip-
ment improperly installed or wired or maintained in violation of the product’s installation instructions. ll claims for
warranty work must be accompanied by proof of the date of installation.
The customer shall be responsible for all costs incurred in the removal or reinstallation of products, including labor
costs, and shipping costs incurred to return products to Marley Engineered Products Service Center.Within the limi-
tations of this warranty, inoperative units should be returned to the nearest Marley authorized service center or the
Marley Engineered Products Service Center, and we will repair or replace, at our option, at no charge to you with
return freight paid by Marley. It is agreed that such repair or replacement is the exclusive remedy available from
Marley Engineered Products.
THE BOVE W RR NTIES RE IN LIEU OF LL OTHER W RR NTIES EXPRESSED OR IMPLIED. ND LL
IMPLIED W RR NTIES OF MERCH NT BILITY ND FITNESS FOR P RTICUL R PURPOSE WHICH
EXCEED THE FORES ID EXPRESSED W RR NTIES RE HEREBY DISCL IMED ND EXCLUDED FROM
THIS GREEMENT. M RLEY ENGINEERED PRODUCTS SH LL NOT BE LI BLE FOR CONSEQUENTI L D M-
GES RISING WITH RESPECT TO THE PRODUCT, WHETHER B SED UPON NEGLIGENCE, TORT, STRICT
LI BILITY, OR CONTR CT.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above exclusion
or limitation may not apply to you. This warranty gives you specific legal rights, and you may also have other rights
which vary from state to state.
For the address of your nearest authorized service center, contact Marley Engineered Products in Bennettsville, SC,
at 1-800-642-4328. Merchandise returned to the factory must be accompanied by a return authorization and service
identification tag, both available from Marley Engineered Products. When requesting return authorization, include all
catalog numbers shown on the products.
Part No. 5200-2147-004 10/01
8
ECR 34640
SPX Corporation
470 Beauty Spot Rd. East
Bennettsville, SC 29512 USA