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First Co HBXX (High Efficiency ECM) User Manual

Hbx / mbx series fan coil units, Installation, operation & maintenance instructions

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Sufficient clearance must be provided

at the front of the fan coil to allow

access to electrical controls and re-

moval of the motor/blower assembly

for servicing. This clearance distance

should be approximately the same as

the depth of the fan coil unit.

HORIZONTAL

APPLICATION

HBX/MBX fan coil units are factory

assembled for horizontal left side

down application without any modifi-

cation required. To convert to horizon-

tal right side down, remove the hori-

zontal drain pan and A-coil assembly,

flip the horizontal drain pan over to the

right side and re-install the horizontal

drain pan and A-coil into the cabinet.

Secure the forward edge of the hori-

zontal drain pan with the leveler angle

bracket. The unit should be leveled in

such a way that there is slope toward

the condensate drain nipple to assure

positive drainage.

AIR DISTRIBUTION

DUCTS

All duct work must be installed in

accordance with National Fire Protec-

tion Association Codes 90A and 90B.

Ducts should be adequately insulated

to prevent condensation during the

cooling cycle and to minimize heat

loss during the heating cycle. The

return air duct must have the same

free area as the opening provided on

the fan coil unit. If there is no ducted

return, applicable installation codes

may limit the unit to installation only in

a single story residence. In many

cases it is acceptable to use ducting

of the same size as the fan coil con-

nections. However, unique arrange-

ments or long duct runs must be

HBX / MBX SERIES

FAN COIL UNITS

INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS

GENERAL

The manufacturer assumes no re-

sponsibility for equipment installed in

violation of any code requirement.

These instructions give information

relative to the installation of these fan

coil units only. For other related

equipment refer to the proper instruc-

tions.

Material in this shipment has been

inspected at the factory and released

to the transportation agency in good

condition. When received, a visual

inspection of all cartons should be

made immediately. Any evidence of

rough handling or apparent damage

should be noted on the delivery receipt

and the material inspected in the pres-

ence of the carrier’s representative. If

damage is found, a claim should be

filed against the carrier immediately.

FAN COIL UNIT

The installer must adhere strictly to

all local and national code require-

ments pertaining to the installation of

this equipment. These units are de-

signed to be installed in either an

upflow or horizontal left or right side

down position.

****** WARNING ******

Unit must not be operated

during building construction

due to excessive airborne dust

and debris. The unit must not

be operated under any

circumstances without an air

filter in place.

confirmed by a local professional. The

manufacturer will not be responsible

for misapplied equipment.

ELECTRICAL

Fan coil units with 10kW or less

electric heat are provided with a termi-

nal block for connection of 1 electrical

service. Units with 15kW and 20kW

are provided with dual circuit breakers

for the connection of 2 electrical ser-

vices and units with 25kW are pro-

vided with 3 circuit breakers for the

connection of 3 separate electrical

services. (Figure 1)

All wiring must comply with local

and national code requirements.

Units are provided with wiring dia-

grams and nameplate data to provide

information required for necessary

field wiring. Knockouts are provided

on the cabinet for connection of power

supply.

These units are provided with a

Class 2 transformer for 24-volt control

circuits. Should any add-on equip-

ment also have a Class 2 transformer

furnished, care must be taken to pre-

vent interconnecting outputs of the

two transformers by using a thermo-

stat with isolating contacts.

**WARNING TO INSTALLER, SERVICE PERSONNEL AND OWNER**

Altering the product or replacing parts with non authorized factory parts voids all warranty or implied

warranty and may result in adverse operational performance and/or a possible hazardous safety

condition to service personnel and occupants. Company employees and/or contractors are not

authorized to waive this warning.

L247B 9/03

****** WARNING ******

Extreme caution must be

taken that no internal damage

will result if screws or holes are

drilled into the cabinet.

All fan coil units are U.L. Listed for

installation with zero inches clear-

ance to combustible materials. This

includes the fan coil cabinet, dis-

charge plenum and connecting ducts.

This manual is related to the following products: