Specifications

ManualsBrandsMarley Engineered Products ManualsHeaterG Series

HUHAA Series

Modular Unit Heaters

Dear Owner,

Congratulations! Thank you for purchasing this new heater manufactured by a division of Marley

Engineered Products. You have made a wise investment selecting the highest quality product in the heat-

ing industry. Please 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

Products... the industry’s leader in design, manufacturing, quality and service.

... The Employees of

Marley Engineered Products

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. All 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. A 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. Any 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

WARNING

Summary of content (8 pages)

PAGE 1
HUHAA Series Modular Unit Heaters FILE #E21609 Installation & Maintenance Instructions Dear Owner, Congratulations! Thank you for purchasing this new heater manufactured by a division of Marley Engineered Products. You have made a wise investment selecting the highest quality product in the heating industry. Please 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 Products.
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IMPORTANT ! CAUTION ! THE HEATER MUST BE MOUNTED AT LEAST 7' (2134mm) ABOVE THE FLOOR TO PREVENT ACCIDENTAL CONTACT WITH THE FAN BLADE WHICH COULD CAUSE INJURY. CAUTION ! 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. CAUTION ! THE CEILING MOUNTING STRUCTURE AND THE ANCHORING PROVISIONS MUST BE OF SUFFICIENT STRENGTH TO SUPPORT THE COMBINED WEIGHT OF THE HEATER AND MOUNTING BRACKET.
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HORIZONTAL DISCHARGE (Rod-mount from Ceiling) 1. 2. WIRING Install four threaded mounting rods in the threaded holes and secure in place using lock nuts. (See Table 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). BRANCH CIRCUIT (POWER) VERTICAL DISCHARGE (Rod-Mount from Ceiling) Table 1. Wall and Ceiling Clearance, inches (mm) Unit Discharge Ceiling Horiz. 2 (50.8) Side Wall 6 (152.
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7. 8. Each heater has a wiring diagram affixed to the inside of The relay (contactor) lead wire “A1” must be moved from the the access door. Consult this diagram before making end terminal of the power terminal block (terminal closest to any field connections. the contactor or control terminal board) to the “A” terminal of the lower terminal block (center terminal).
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LEAD WIRE "A1" HEATER FRONT HEATER FRONT 3 PHASE BLOCK 3 PHASE BLOCK LEAD WIRE "A1" TO ELEMENTS TO ELEMENTS LEAD WIRE "B1" B A ELEMENTS CONTACTOR (OR P2) POWER TERMINAL BLOCK LEAD WIRE "B1" B A ELEMENTS CONTACTOR (OR P2) FACTORY-WIRED FOR SINGLE-PHASE POWER POWER TERMINAL BLOCK FIELD-WIRED FOR THREE-PHASE POWER C1 D C C1 3 PHASE BLOCK C1 D1 C1 3 PHASE BLOCK FACTORY-WIRED FOR SINGLE-PHASE POWER Figure 3b.
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Table 4. Specifications CONTROL WIRING ! Basic Model No. WARNING 27 (12.2) HUHAA324 27 (12.2) DISCONNECT THE POWER FROM THE HEATER BEFORE HUHAA327 HUHAA348 27 (12.2) 16 (406.4) 14 (355.6) 8-1/2 (214.4) 27 (12.2) HUHAA520 27 (12.2) HUHAA524 27 (12.2) HUHAA527 27 (12.2) Use min. 600 volts, NEC Class 1 insulated wire for all control HUHAA548 30 (13,6) circuit wiring. HUHAA720 38 (17.2) Use a crimp-on type fork terminal on the wire ends that attach HUHAA724 38 (17.
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S RED BLACK TO W1 REMOTE REMOTE SUMMER FAN SWITCH SWITCH (MRFS-1) (HUHAARFS1) FAN RELAY FAN RELAY FOR (HUHAARFS2 AND HUHAAHRT) (FOR MRFS-2 AMD MHRT) BLACK T T MT-1MT-1 HUHAA -2 HUHAA MT MT-2 2-STAGE INTERNAL THERMOSTAT NOTES: TR S 1. THIS STYLE CONTROL TERMINAL BOARD USED WITH MODELS EXCEPT HUHAA320, HUHAA324, HUHAA327, HUHAA520, HUHAA524, HUHAA527.
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LIMITED WARRANTY All products manufactured by Marley Engineered Products are warranted against defects in workmanship and materials for one year from date of installation, except heating elements which are warranted against defects in workmanship and materials for five years from date of installation.