Bananza UHD 150 series Operation Manual - page 14

UHD S

TANDARD 

D

UCT 

F

URNACE 

I

NSTALLATION 

O

PERATION AND 

S

ERVICE 

M

ANUAL

6 of 55

SECTION 3: CRITICAL CONSIDERATIONS

3.1 Basic Information

UHD[T][M][X][S][R] heaters have automatic ignition 

burners for ON/OFF, HIGH/LOW or modulate within 

the range of HIGH/LOW operation.

3.2 Manufactured Units

Gas-fired, power-vented duct furnace with tubular 

heat exchanger. Units shall have a minimum of 82% 

thermal efficiency. The standard unit shall consist of 

a non-separated combustion design with an 

aluminized heat exchanger and a single stage gas 

valve. Design and heat exchanger alternatives shall 

be offered as follows:

• Separated Combustion: [S] A separated 

combustion unit shall consist of a sealed 

enclosure with a hinged door. Combustion air 

inlet on rear of heater allows for intake venting 

from outside of heated space to be attached. 

Combustion flue gases shall be ducted from 

outside heated space by ductwork connected to 

unit's outlet flange.

• Stainless Steel Heat Exchanger: [X] A stainless 

steel heat exchanger unit shall consist of heat 

exchanger tubes, heat exchanger tube supports 

and heat exchanger tube plate produced of 409 

stainless steel. Air inlet temperatures below 40° 

F (4.4° C) are not recommended for this 

application.

• Two Stage Gas Valve: [T] A two stage gas valve 

shall allow heater to function in either high or low 

operation.

• Modulating Gas Valve: [M] A modulating gas 

valve shall allow heater to modulate between 

high and low fire. 

• Approved for Installation Downstream of a 

Refrigeration System: [R] Installation allows for 

unit to be installed downstream of a refrigeration 

system. Unit design shall include a 409 stainless 

steel package. Stainless steel package includes 

heat exchanger, tube supports and drip pan.

3.3 Location and Suspension

All models:

• Must be installed indoors.

• Must be installed on the positive pressure side of 

the air circulation blower.

• Must be installed in a level position with 

horizontal discharge.

• May be mounted on a shelf of non-combustible 

material.

• May be suspended from above (See Page 10, 

Section 6.2) or from wall brackets of sufficient 

strength to support the heater as listed in the 

Technical Data Table on Page 51, Section 16.2 

and Page 53, Section 16.5.

• Drop rods must be a minimum of 3/8" diameter 

mild steel. Four suspension points (3/8" nuts) 

are located on top of the heater.

• Must be installed in a manner which allows 

access to all serviceable components.

3.4 Minimum Required Installation Clearances

Clearances around the heater and vent must be as 

indicated on Page 7, Figure 4 and Page 11, Section 

7 to ensure access for servicing and correct 

operation.

3.5 Ventilation

It is important to ensure that there is adequate air 

space around the heater to supply air for 

combustion, ventilation and distribution in 

accordance with local and national code on Page 

11, Section 7.

3.6 Gas Supply

It is important that the gas supply pipe is sized 

correctly to provide the inlet pressure as stated on 

the heater data plate. The gas supply pipe and 

electrical connections must not support any of the 

heater's weight. See Page 18, Section 9.

3.7 Electrical Supply 

A permanent 120 V / 1 Ø / 60 Hz electrical supply is 

required for the main electrical power. The heater 

also requires suitable controls listed on Page 20, 

Section 10.

3.8 Vent 

Choose heater orientation to allow for proper 

location of the vent. Each heater must be fitted with 

a correctly sized sealed vent system. 

If vented horizontally, no other equipment may be 

connected to the vent. See Page 11, Section 7.