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TYPICAL HEAT EXCHANGER ASSEMBLY
120, 240, & 288 UNITS
HEAT
EXCHANGER
TUBE
COMBUSTION
AIR INDUCER
GAS VALVE
BURNER
FIGURE 4
Service
To maintain efficiency and longevity, your equipment
must be serviced yearly by a qualified service technician.
Failure to provide proof of service can void warranty.
CAUTION
Label all wires prior to disconnection when servic-
ing controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
Servicing Filter
Units are equipped with the number of filters shown in
table 1. Filters should be checked monthly and replaced
when necessary with filters of like kind and size. Take note
of air flow direction marking on filter frame when
reinstalling filters. See figure 5.
REMOVE FILTERS
FIGURE 5
VENT
CONNECTOR
PULL TO REMOVE
FILTERS
Page 5
NOTE−Filters must be U.L.C. certified or equivalent for
use in Canada.
TABLE 1
NUMBER AND SIZE OF FILTER BY UNIT
SG Unit
Qty Filter Size − inches (mm)
036, 060
120
240, 288
12
Lubrication
All motor bearings are prelubricated. No further
lubrication is required.
Blower shaft bearings are prelubricated. For extended
bearing life, relubricate at least once every two years
with a lithium base grease, such as Alvania 3 (Shell Oil),
Chevron BRB2 (Standard Oil) or Regal AFB2 (Texas
Oil). Use a hand grease gun for relubrication. Add only
enough grease to purge through the bearings so that a
bead of grease appears at the seal lip contacts.
Manifold Pressures
Manifold pressures are shown in table 2. Refer to figure 2
to locate pressure ports.
TABLE 2
MANIFOLD INPUT PRESSURES
Natural Gas
1st Stage
2nd Stage
SG Unit
+ 0.2
(+.05)
036
NA
3.7 (0.92)
060,
120, 240,
1.6 (0.40) 3.7 (0.92) 5.5 (1.37)
288
Burners
Clean burners as follows:
1− Turn off both electrical power and gas supply to unit.
2− Open
or
remove
compartment.
3− On 036 and 060 units, remove and retain four screws
securing burner support cap and lift burners from
orifices. See figure 6. On 120, 240, and 288 units,
remove and retain two screws securing burners to
burner support. See figure 7.
4− Clean as necessary and replace burners. On 036 and
060 units, replace burner support cap and secure
with retained screws. On 120, 240, and 288 units,
secure burners with retained screws. Replace burner
compartment access panel.
4
16 X 20 X 2 (406 X 508 X 51)
6
16 X 25 X 2 (457 X 635 X 51)
20 X 20 X 2 (508 X 508 X 51)
in.wg. (kPa)
Propane (LP) Gas
1st Stage
2nd Stage
+ 0.3
+ 0.2
+ 0.3
(+.08)
(+.05)
(+.08)
NA
10.5 (2.61)
10.5 (2.61)
access
panel
to
burner
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