Bananza UHD 125, Installation, Operation & Service Manual

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SECTION 3: C
RITICAL
C
ONSIDERATIONS
5 of 47
SECTION 3: CRITICAL CONSIDERATIONS
3.1 Basic Information
UHD[X][S] heaters have a u tomatic ignition b u rners
for ON/OFF operation only.
3.2 Manufactured Units
Gas-fired, po w er-vented d u ct f u rnace w ith t u b u lar
heat exchanger. Units shall have a minim u m of 82%
thermal efficiency. The standard u nit shall consist of
a non-separated comb u stion design w ith an
al u minized heat exchanger. Design and heat
exchanger alternatives shall be offered as follo w s:
• Separated Comb u stion: A separated
comb u stion u nit shall feat u re an enclosed,
sealed b u rner box. A piece of flexible air d u ct
connects this b u rner box to a flange on the
cabinet. Comb u stion air sho u ld be d u cted from
o u tside the heated space, w ith the d u ct w ork
connecting to the u nit w ith the u se of the flange.
• Stainless Steel Heat Exchanger: A stainless
steel heat exchanger u nit shall consist of heat
exchanger t u bes, heat exchanger t u be s u pports,
heat exchanger t u be plates and vent box
prod u ced of 409 stainless steel.
The u se of stainless steel heat exchanger is
recommended w hen air inlet temperat u res are
belo w 40° F (4.4° C) or temperat u re rise is less
than 40° F (22.2° C) as condensation may form
on the heat exchanger res
u lting in corrosion that
may shorten its life.
3.3 Location and Suspension
All models:
• M u st be installed indoors.
• M u st be installed on the positive press u re side of
the air circ u lation blo w er.
• M u st be installed in a level position w ith
horizontal discharge.
• May be mo u nted on a shelf of non-comb u stible
material u sing shelf mo u nting brackets.( See
Page 11, Figure 6 and Page 11, Figure 7 for
details.)
• Drop rods m u st be a minim u m of 3/8" diameter
mild steel. Fo u r s u spension points (3/8" n u ts)
are located on top of the heater.
• May be s u spended from above ( See Page 10,
Figure 5 ) or from w all brackets of s u fficient
strength to s u pport the heater as listed in the
Technical Data Table on Page 45, Section 16.2 .
• M u st be installed in a manner w hich allo w s
access to all serviceable components. See Page
6, Figure 3 for details.
3.4 Minimum Re q uired Installation Clearances
Clearances aro u nd the heater and vent m u st be as
indicated on Page 6, Figure 3 and Page 14, Figure 8
to ens u re access for servicing, and correct
operation.
3.5 Ventilation
It is important to ens u re that there is adeq u ate air
space aro u nd the heater to s u pply air for
comb u stion, ventilation and distrib u tion in
accordance w ith local and national codes. See Page
12, Section 7 .
3.6 Gas Supply
It is important that the gas s u pply pipe is sized
correctly to provide the inlet press u re as stated on
the heater data plate. The gas s u pply pipe and
electrical connections m u st not s u pport any of the
heater's w eight. See Page 20, Section 9 .
3.7 Electrical Supply
A permanent 120 V /1 Ø/60 Hz electrical s u pply is
req u ired for the main electrical po w er. The heater
also req u ires s u itable controls in accordance w ith
Page 22, Section 10 .
3. 8 Vent
Choose heater orientation to allo w for proper
location of the vent. Each heater m u st be fitted w ith
a correctly sized sealed vent system.
If vented horizontally, no other appliance may be
connected to the vent.
See Page 12, Section 7 .