background image

your particular locality (contact your gas company for
this information - it varies widely from city to city.)

NORMAL MAINTENANCE

CAUTION: Prior to any of the following maintenance proce-

dures, shut off all electric power to the unit to
prevent personal injury.

Periodic maintenance normally consists of changing or
cleaning filters and (under some conditions) cleaning the main
burners.
FILTERS - Inspect once a month. Replace disposable or clean
permanent type as necessary. DO NOT replace permanent
type with disposable. The dimensional size of the replacement
filter must be the same as the replaced filter.
MOTORS
Outdoor fan motors are permanently lubricated and require no
maintenance.
Ventor motor is factory lubricated for an estimated 10 year life.
Indoor Blower Motor and Drive - The indoor blower motor
features ball bearings that do not require periodic lubrication.
Periodic lubrication of the motor and bearings can extend the
life of components but is optional.
CAUTION: D a m a g e   c a n   o c c u r   i f   t h e   b e a r i n g s   a r e

overlubricated. Use grease sparingly.

WARNING: Perform all maintenance operations on the blower

motor with electric power disconnected from the
unit. Do not attempt to lubricate bearings with the
unit in operation.

On an annual basis, check the motor for accumulations of dust,
etc. that may block the cooling slots in the motor shell. Check
for loose, damaged or misaligned drive components. Check
that all mounting bolts are tight. Replace defective parts as
required.

If desired, every three years remove both pipe plugs at each
end shell and clean out any hardened grease or foreign matter.
Replace one plug on each end with a clean grease fitting. Using
a low pressure grease gun, pump grease (Chevron SRI-2 or
equivalent) into the bearing cavity until new grease shows at
the open port. Do not over lubricate. Run the motor for ten
minutes until excess grease is purged from the cavity. Replace
the plugs.

On 20 ton only, units are supplied with blower shaft bearings
that do not require maintenance but may be relubricated if
desired. Every three years, using a low pressure grease gun,
pump grease into the bearing grease fitting until grease just
begins to show at the seals. Do not over lubricate. Use any
lithium base grease recommended for ball bearing service.
OUTDOOR COIL - Dirt should not be allowed to accumulate
on the outdoor coil surface or other parts in the air circuit.
Cleaning should be as often as necessary to keep coil clean.
Use a brush, vacuum cleaner attachment, or other suitable
means. If water is used to clean coil, be sure electric power to
the unit is shut off prior to cleaning.

NOTE: Exercise care when cleaning the coil so that the coil

fins are not damaged.
Do not permit the hot condenser air discharge to be
obstructed by overhanging structures of shrubs.

BURNER & PILOT - Periodically (at least annually at the
beginning of each heating season) make a visual check of the
pilot and main burner flame. If necessary, adjust main burner
primary air shutters to give a distinct, sharp blue flame as

explained under “BURNER AIR SHUTTER ADJUSTMENT”. If
it is not possible to adjust for the proper flame, the burners may
need cleaning.
TO CLEAN BURNERS - Remove them from the furnace as
explained in “Burner Instructions”. Clean burners with hot water
applied along top of the burner.
COMBUSTION AIR DISCHARGE - Visually inspect discharge
outlet periodically to make sure that the buildup of soot and dirt
is not excessive. If necessary, clean to maintain adequate
combustion air discharge.

CLEANING FLUE PASSAGES AND HEATING
ELEMENTS

With proper combustion adjustment the heating element of a
gas fired furnace will seldom need cleaning. If the element
should become sooted, it can be cleaned as follows:

1. Remove the burner assembly as outlined in “BURNER

INSTRUCTIONS”.

2. Remove the roof over the gas heat section.
3. At the top plate from the top draft blower housing and the

top draft blower wheel.

4. Remove the screws holding the top of the flue collector box.

Carefully remove the top of the flue collector box without
ripping the adjacent insulation. Then remove the center
divider plate separating the upper and lower flue boxes.

5. On the inside of the flue collector box, remove the flue

baffles from the tube interiors. Note the last bend of the
baffle fits tightly against the tube forcing the end of the baffle
to lock into the tube collar. This collar is formed when the
tube is expanded into the end sheet. To remove, move the
end of the baffle toward the center of the tube releasing the
end of the baffle from the tube collar, then pull straight out
of the tube. Refer to Typical Flue Baffle figure.

6. Using a wire brush on a flexible wand, brush out the inside

of each heat exchanger from the burner inlet and flue outlet
ends.

7. Brush out the inside of the flue collector box and the flue

baffles.

8. Run the wire brush down the vent hoods from the flue

collector end.

9. If soot build-up is particularly bad, remove the vent motor

and clean the wheel and housings. Run the wire brush down
the flue extentions at the outlet of the vent housings.

10. After brushing is complete, blow all brushed areas with air

or nitrogen. Vacuum as needed.

11. Replace parts in the order they were removed in Steps

1 thru 4.

12. When replacing the center and top of the flue collector box,

be careful not to tear the adjoining insulation.

MAINTENANCE

FIG. 19 - TYPICAL FLUE BAFFLE INSTALLATION

530.18-N6Y

Unitary Products Group

21

Summary of Contents for D2CG180

Page 1: ...rsion Accessory USA 530 18 N6 2V High Altitude Accessory Nat Gas 530 18 N6 3V High Altitude Accessory Propane 530 18 N13Y Coil Guard Installation Renewal Parts Refer to the Renewal Parts Manual for co...

Page 2: ...7 Four And Six Point Loads 12 8 Supply Air Blower Perf 15 Ton 13 9 Supply Air Blower Perf 20 Ton 14 10 Static Resistances 15 11 Power Exhaust Performance 15 12 Blower Motor and Drive Data 15 13 Limit...

Page 3: ...ame other than a YORK roof curb gasketing must be applied to all surfaces that come in contact with the unit underside 5 Maintain level tolerance to 1 2 inch maximum across the entire length or width...

Page 4: ...ductwork to accommodate the damper Using the holes in the hood flanges as a template drill 9 64 inch dia 26 drill holes into the ductwork and secure with the screws provided CAUTION If outdoor air in...

Page 5: ...ing to the unit waterproof type connectors MUST BE USED so that water or moisture cannot be drawn into the unit during normal operation The above waterproofing conditions will also apply when installi...

Page 6: ...or John Crane may be used 4 All piping should be cleaned of dirt and scale by hammering on the outside of the pipe and blowing out the loose dirt and scale Before initial start up be sure that all of...

Page 7: ...securing in place OPTIONAL ECONOMIZER MOTORIZED DAMPER RAIN HOOD The instruction for the optional economizer motorized damper rain hood can be found in form 44 320 2 Use these instructions when field...

Page 8: ...FIG 9 ENTHALPY SETPOINT ADJUSTMENT 530 18 N6Y 8 Unitary Products Group...

Page 9: ...6 0 43 3 COMPRESSOR Qty Per Unit 10 TON TANDEM 1 2 5 TON HERMETIC 1 AIR FILTERS QUANTITY PER UNIT 16 X 20 X 2 4 QUANTITY PER UNIT 16 X 25 X 2 4 QUANTITY PER UNIT 18 X 24 X 2 5 TOTAL FACE AREA sq ft 15...

Page 10: ...84 9 100 460 3 60 19 2 124 9 6 62 1 2 1 5 7 2 42 4 50 575 3 60 15 4 100 7 7 50 1 2 0 5 5 9 33 9 40 DCG240 208 230 3 60 38 4 248 38 4 248 1 4 1 4 2 7 5 21 0 19 4 115 1 111 6 125 460 3 60 19 2 124 19 2...

Page 11: ...ic meters gas meters regulators and relief equip R E T U R N A I R S U P P L Y A I R B O T T O M S U P P L Y A N D R E T U R N A I R O P E N I N G S S e e N o t e B P O W E R W I R I N G E N T R Y A C...

Page 12: ...NOTE These weights are with economizer and the largest blower motor available UNIT 6 POINT LOADS LBS TOTAL A B C D E F 180 2300 351 367 392 416 399 375 240 2500 334 350 426 502 481 407 NOTE These weig...

Page 13: ...7 3 0 2 7 0 4 3 5 3 1 915 5 0 1 1 2 6 2 4 0 8 3 1 2 8 0 5 3 6 3 2 0 2 4 1 3 7 965 4 0 1 2 2 7 2 5 0 9 3 2 2 9 0 6 3 7 3 3 0 4 4 4 3 9 0 2 5 0 4 5 980 3 5 1 3 2 9 2 6 1 0 3 4 3 0 0 7 3 8 3 4 0 5 4 5 4...

Page 14: ...4 1 1 5 0 4 2 0 6 5 9 5 0 0 1 6 7 5 7 950 3 5 1 7 4 2 3 6 1 3 5 1 4 3 0 8 6 0 5 1 0 2 6 9 5 8 965 2 5 1 9 4 5 3 8 1 5 5 4 4 5 1 0 6 3 5 3 0 4 7 2 6 1 0 1 8 5 7 1 995 2 0 2 1 4 6 3 9 1 6 5 5 4 7 1 1 6...

Page 15: ...65 1190 BK80 7 75 7 4 1 BX68 69 8 1 20 TON Stan dard 870 1025 7 5 213T 89 1VP68 6 75 5 5 6 52 1 3 8 BK120 11 75 11 4 1 3 16 BX83 84 8 1 High Speed Access 950 1120 BK110 10 75 10 4 1 3 16 BX81 81 8 1 1...

Page 16: ...rating efficiency ECONOMIZER SINGLE OR DUAL WITH POWER EXHAUST This system operates as specified above with one addition The power exhaust motor is energized whenever the economizer is chosen by the e...

Page 17: ...here are two separate gas valves in the furnace Each valve contains a main and a redundant valve The redundant valves are located upstream of the main gas valves Should either or both of the main gas...

Page 18: ...units If gas pressure is outside these limits contact the local gas utility for corrective action MANIFOLD GAS PRESSURE ADJUSTMENT Small adjustments to the high fire gas flow may be made by turning th...

Page 19: ...within the limitations shown in the Applications Data Table 2 Pulleys can be adjusted in half turn increments 3 The tension on the belt should be adjusted as shown in the Belt Adjustment figure Start...

Page 20: ...2 With the furnace turned on measure the time needed for one revolution of the hand on the smallest dial on the meter A typical gas meter usually has a 1 2 or a 1 cubic foot test dial 3 Using the numb...

Page 21: ...E Exercise care when cleaning the coil so that the coil fins are not damaged Do not permit the hot condenser air discharge to be obstructed by overhanging structures of shrubs BURNER PILOT Periodicall...

Page 22: ...tat fan switch set to AUTO a Set fan switch to ON If blower motor runs go to Step f If it does not check to see if line voltage is being supplied to the contacts of the contactor M3 and if the contact...

Page 23: ...T CHECKOUT b Check all wiring between the ignitor control and the gas valve Check to make sure the ground connections are intact c If the wiring is intact check for 24 volts across terminals PV and CO...

Page 24: ...and information from OUR current parts list for this unit are available to your servicing contractor through our local distributor The name and address of our nearest distributor may be obtained by co...

Reviews: