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HUHAA Series
Modular Unit Heaters
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 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.
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.
WARNING
!
SAVE THESE INSTRUCTIONS
1
... The Employees of
Marley Engineered Products
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.
FILE #E21609
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Page 1: Save These Instructions
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 heat- ing industry. -
Page 2: Mounting The Heater
IMPORTANT CAUTION CAUTION THE HEATER MUST BE MOUNTED AT LEAST 7' (2134mm) ALL BUILT-IN THERMOSTATS: IF THE HEATER IS USED TO ABOVE THE FLOOR TO PREVENT ACCIDENTAL CONTACT PREVENT PIPING OR LIQUIDS FROM FREEZING, AND IF WITH THE FAN BLADE WHICH COULD CAUSE INJURY. THE THERMOSTAT IS SET BELOW 45°... - Page 3 HORIZONTAL DISCHARGE (Rod-mount from Ceiling) WIRING Install four threaded mounting rods in the threaded holes BRANCH CIRCUIT (POWER) 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).
- Page 4 (center terminal). Single or three-phase power connections may be used with heater models HUHAA520, HUHAA524, Model HUHAA1520 (Figure 3b)has two three-phase terminal HUHAA720, HUHAA724, HUHAA1020, HUHAA1024 blocks located adjacent to the relays (contactors). Move and HUHAA1520. These units are factory wired for sin- only the two wires marked “C1”...
- Page 5 (OR P2) FACTORY-WIRED FOR SINGLE-PHASE POWER FIELD-WIRED FOR THREE-PHASE POWER Wiring Connections for Single-Phase and Three Phase Power Figure 3a. (HUHAA520, HUHAA524, HUHAA720, HUHAA724, HUHAA1020 and HUH HUHAA1024) 3 PHASE BLOCK 3 PHASE BLOCK 3 PHASE BLOCK 3 PHASE BLOCK...
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Page 6: Control Wiring
HUHAA1027 38 (17.2) 38 (17.2) Note: Thermostat and control circuit wiring must be suitable HUHAA1048 HUHAA1520 53 (24.0) to handle the full load of the heater (example HUHAA520 is HUHAA1524 53 (24.0) rated 24 amps) HUHAA1548 21-3/4 13-3/4 53 (24.0) On units provided with internal contactor (units rated 7 KW (482.6) - Page 7 NOTES: INTERNAL THERMOSTAT 1. THIS STYLE CONTROL TERMINAL BOARD USED WITH MODELS EXCEPT HUHAA320, HUHAA324, BLACK HUHAA327, HUHAA520, HUHAA524, HUHAA527. SUMMER SWITCH .2. REMOVE JUMPER W1 TO W2 WHEN 2-STAGE THER- RED TO R MOSTAT IS USED. 3. *ONLY ONE OF THESE ACCESSORIES MAY BE...
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Page 8: Limited Warranty
LIMITED WARRANTY All 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;...