York D2CG 072, D7CG 036, D7CG 048, D7CG 060 User Manual

SUNLINE 2000

GAS / ELECTRIC

SINGLE PACKAGE AIR CONDITIONERS

INSTALLATION INSTRUCTION

CAUTION

SCROLL COMPRESSORS OPERATE IN ONLY ONE DIRECTION.

If the compressor is experiencing:

- low amperage draw

- similar discharge and suction pressure

- increased noise level It is operating in reverse.

Switch two line voltage connections to correct.

GENERAL

YORK Model DCG units are single package air conditioners with gas heat desig ned fo r outd oor in st alla tion on a roof top or a slab.

The units are completely assembled on rigid, permanently attached base rails. All piping, refrigerant charge, and electrical wiring is factory-installed and tested. The units require only electric power, gas piping and duct connections at the point of installation.

The gas-fired heaters have aluminized steel tubular heat exchangers and spark ignition with intermittent pilot.

This appliance is not to be used for temporary heating of buildings or structures under construction.

INSPECTION

As soon as a unit is received, it should be inspected for possible damage during transit. If damage is evident, the extent of the damage should be noted on the car rier’s freig ht bill. A sepa rate request for inspec tion by the carr ier’s agent sho uld be made in writing. Refer to Form 50.15-NM for additional information.

REFERENCE

Additional information on the design, installation, operation and service of this eq uipment is availa ble in the followi ng reference form s:

55.70-N1 -General Installation

•

55.70-N2 -Pre-start & Post-start Check List

•

530.18-N1.2 V -Economizer Ac ce ss or y

•

530.18-N1.13V -M an. Out door Air Damp er Acc y 0-3 5%

•

530.18-N1.14V -Man. Outdoor Air Damper Accy 0-100%

•

Supersedes: 530. 18 -N 8 Y (2 95)

MODELS D7CG 036, 048 & 060 (10 SEER)

MODEL D2CG 072 (9 EER)

(STYLE A & Belt Drive Option)

Do not store or use gasoline or other flammable vapors or liquids in the vicinity of this or any other appliance

If you smell gas:

1. Open windows

2. Don’t touch electrical switches.

3. Extinguish any open flame.

4. Immediately call your gas supplier.

530.18-N1.12V - Mot oriz ed O utdo or Air Damp er Acc y.

•

530.18-N1.8V -Coil Guard

•

530.18-N2.11V -Low NOx Accessory

•

530.18-N8.2V -High Altitude Accy. (Natural Gas)

•

530.18-N8.3V -High Altit ud e Ac cy. (Propane)

•

530.18-N8.4V -Gas Piping Accessory

•

530.18-N8.12V -Propane Conver sion Accessor

•

690.15-N25V -Low Ambien t Access or y

•

Renewal Parts:

Refer to Part s Manual for comple te listing of repla cement

•

parts on this equipment.

All forms referenced in this instruction may be ordered from:

Publications Distribution Center Unitary Products Grou p P.O. Box 1592, York, P A 17405

APPROVALS

Design certified by CGA and UL listed as follows:

1. For use as a forc ed air furnace w ith cooling unit .

2. For outdoor installation only.

3. For installation directly on combustible flooring or, in the U.S.A., on wood flooring or Class A, B, or C roof covering material.

4. For use with natural gas and/or propane (LP) gas . Not suitable for use with conventional venting systems.

530.18-N8Y (1096)

035-14838

FOR YOUR SAFETY

Installer should pay particular attention to the words: the instal lation ea sier . Cautio ns are giv en to prev ent equip ment dam age. W arnings are given to alert installer that personal injury and/or equipment damage may result if installation procedure is not handled properly.

NOTE, CAUTION

and

WARNING

. Notes are inte nd ed to cl arif y o r make

CAUTION

THIS PRODUCT MUST BE INSTALLED IN STRICT COMPLIANCE WITH THE ENCLOSED INSTALLATION INSTRUCTIONS AND ANY APPLICABLE LOCAL, STA TE, AND NA TIONAL CODES INCLUDING, BUT NOT LIMITED TO, BUILDING, ELECTRICAL, AND MECHANICAL CODES

WARNING

INCORRECT INSTALLATION MAY CREATE A CONDITION WHERE THE OPERATION OF THE PRODUCT COULD CAUSE PERSONAL INJURY, PROPER T Y DAM AGE AND/ OR DEATH.

WARNING

DE-ENERGIZE THE ELECTRICAL POWER AND TURN OFF THE GAS SUPPLY TO THE UNIT BEFORE ATTEMPTING TO INSPECT, REPAIR OR PERFORM MAINT ENANCE TO THE UNIT.

530.18-N8Y

TABLE OF CONTENTS

General................................................................................1

Inspection.............................................................................1

Reference ............................................................................1

Approvals ............................................................................. 1

Nomenclature....................................................................... 2

INSTALLATION

Limitations............................................................................3

Location ...............................................................................3

Rigging and Handling .......................................................... 3

Clearances...........................................................................3

Ductwork .............................................................................. 3

Filters ................................................................................... 4

Condensate Drain................................................................4

Service Access..................................................................... 4

Thermostat.................. ........ ........ ........ ........ ........ ........ ........ .4

Power and Control Wiring.................................................... 4

Blower Speed Selection....................................................... 4

Scroll Compressors....................................................... ....... 4

Combustion Discharge........... .. .. .. .......................... .. ...........4

Disconnect Switch Bracket For Optional Belt-Drive ............ 5

Gas Piping .......................................... .. .............. .............. ... 5

Gas Connection.................. .. .. .. .. .............. .............. .............6

L.P. Units, Tanks and Piping ................................................ 6

Low NOx Application......... ...... ...... ...... ...... ...... ...... ...... .... .....6

Ven t and Comb usti on Air Hood s............. .... .... .... .... .... .... .... .7

Optional Economizer Rain Hood...................................7 & 8

OPERATION

Cooling System.................................................................. 15

Cooling Sequence of Operation......................................... 15

Safety Controls (Cooling)........................... ........................ 15

Heating Sequence of Operation ........................................15

Safety Controls (Heating) ..................................................15

Heat Anticipator Setpoints ................................................. 16

Pre-Start Check List...........................................................16

START-UP

Operating Instructions........................................................ 16

Post-Start Check List (Gas)............................................... 16

Manifold Gas Pre ssur e Adju st ment.................... .... .... .... .. .16

Pilot Checkout.................................................................... 17

Burner Instructions.............................................................17

Burner Air Shutt er Adju stment............ .... ...... ...... ...... ...... ...17

Supply Air Blower and Temperat ure Rise Adjus tment.......17

Checking Gas Input ........................................................... 18

Secure Owner’s Approval.................................................. 18

MAINTENANCE & TROUBLE SHOOTING

Normal Maintenance....... .. .. .. .............. .............. .............. ... 19

Cleaning Flue Passages and Heating Elements............... 19

Troubleshooting .........................................................19 & 20

TABLES

No. Description Page

1 Unit Applicatio n Da ta............ .... .... .... .... .... .. 3

2 Gas Heat Application Data.......................... 4

3 Pipe Sizing .... .................... .................. ....... 5

4 Static Resistances ...................................... 8

5 Physical Data.............................................. 9

6 Supply Air Blower Perf

. 3 - 6 Ton Direct-Drive

7 Motor & Drive Data-Belt-Drive Blower........ 9

8 Supply Air Blower Perf. 3 & 4 Ton Belt-Drive 10

9 Supply Air Blower Perf. 5 & 6 T on Belt-Drive 11

10 Electrical Data Direct- D ri ve.. .. ..................... 12

11 Electrical Data Belt-Drive............................ 12

12 Superheat, 036 ........................................... 12

13 Superheat, 048 ........................................... 13

14 Superheat, 060 ........................................... 13

15 Superheat, 072 ........................................... 13

16 Limit Control Setting ................................... 16

17 Belt Drive Supply Air Mot or Pulle y Adj........ 17

18 Gas Rate - Cubic Feet Per Hour ................ 18

FIGURES

No. Description Page

1 Recommended Drain Piping....................... 4

2 Typical Field Wiring..................................... 5

3 External Supply Connecti on ....................... 6

4 Bottom Supply Connection......................... 6

5 Ven t and Comb usti on Air Hood s......... .... .... 7

6 Economizer Rain Hoo d Assem bly.............. 7

7 Enthalpy Setpoint Adjustment..................... 8

8 Center of Gravity......................................... 9

9 Dimensions and Clearances....................... 14

10 Gas Valve Piping........................... .............. 15

11 Gas Valves.................... .......................... .. .. 16

12 Proper Flame Adjustm ent.................. ...... ... 17

13 Typ ical F lam e Ap pear ance...................... ... 17

14 Belt Adjustment.................... .......... .......... ... 17

15 Press. Drop versus Supply Air CFM........... 18

PRODUCT NOMENCLAT URE

D 7 C G 4N

PRODUCT CATEGORY

D = Single Package Air Conditioner (Air Cooled)

PRODUCT GENERAT ION

2 = 2nd Generation

7 = 7th Generation

PRODUCT IDENTIFIER

CG = Gas/El ectric

2 Unitary Products Group

NOMINAL COOLING

CAPACITY

036 = 3 Ton 048 = 4 Ton 060 = 5 Ton 072 = 6 Ton

0 030 6 2 5

FACTORY INSTALLED

HEAT

N = Gas Heat Installed

VOLTAGE CODE

06 = 208/230-1-60 25 = 208/230-3-60 46 = 460-3-60 58 = 575-3-60

NOMINAL GAS HEATING

OUTPUT CAP ACITY

040 = 40 MBH 060 = 60 MBH 079 = 79 MBH 099 = 99 MBH

INSTALLATION

LIMITATIONS

These units mu st be installe d in accorda nce with the cu rrent editions of the following national and local safety codes: In the U.S.A.:

1. National Electrical Co de AN SI /N F PA No . 70 .

2. National Fuel Gas Code Z223.1.

3. Gas-Fired Central Furnace Standard ANSI Z21.47-1993.

4. Local gas utility re quirements. In Canada:

1. Canadian Electrical Code CSA C22.1

2. Current Gas Installation Codes CAN/CGA-2.3-M93.

3. Local plumbing and was t e water codes.

4. Other applicable local codes. Refer to Table 1 for Unit Application Data and to T able 2 for Gas

Heat Application Data. If components are to be added to a unit to meet local codes, they

are to be installed at the dealer’s and / or the customer’s expense. Size of unit fo r pr op os ed ins tall at io n sh ou ld be base d on hea t

loss / heat gain calculation made according to the methods of Air Conditioning Contractors of America (ACCA).

TABLE 1

Voltage Variation Min. / Max.

Supply Air CFM, Nom. 1200 1600 2000 2400 Wet Bulb Temperature (°F) of

Air on Evaporator Coil, Min. / Max.

Dry Bulb Temperature (°F) of Air on Condenser Coil, Min.

Utilization range “A” in accordance with ARI St anda rd 110.

A low ambient accessory is available for operation down to 0°F.

LOCATION

Use the follow ing guidelines to selec t a suitable location for these units.

1. Unit i s designed for outdo or installation only.

2. Condenser coils must have an unlimited supply of air.

WARNING:Excessive exposure of this furnace to contami-

3. For ground level installation, a level pad or slab should be

- UNIT APPLICATION DATA

UNIT SIZE 036 048 060 072

208/230V 187 / 253

460V 414 / 504

575V 518/630

57 / 72 57 / 72 57 / 72 57 / 72

/ Max.

Where a choice of location is possible, p os ition the unit on either north or east side of building.

nated combustion air may result equipment damage or personal injury. Typical contaminates include: permanent wave solutions, chlorinated waxes and cleaners, chlorine based swimming pool chemicals, water softening chemicals, carbon tetrachloride, Halogen type refrigerants, cleaning solvents (e.g. perchloroethylene), printing inks, paint removers, varnishes, hydrochloric acid, cements and glues, antistatic fabric softeners for clothes dryers, masonry acid washing materials.

used. The thic kness and size of the pad or sl ab used should meet local codes and unit weight. Do not tie the slab to the building foundation.

45 / 120 45 / 120 45 / 120 45 / 120

530.18-N8Y

4. Roof structures must be able to support the weight of the unit and its options and / or accessories. Unit must be installed on a solid level roof curb or appropriate angle iron frame.

CAUTION: If a unit i s to be in st al le d o n a roof cu rb or sp ec ia l

frame other than a YORK roof curb, gasketing must be applied to all su rfaces that come in con tact w ith the unit underside.

5. Maintain level tolerance to 1/2" maximum across the entire length or width of the unit.

6. Elevate the unit sufficiently to prevent any blockage of the air entrances by snow in areas where there will be snow accumulation. Check the local weather bureau for the expected snow accumulation in your area.

RIGGING AND HANDLING

Exercise care when moving the unit. Do not remove any packaging unti l the unit is ne ar the place of installa tion. Rig the unit by attaching chain or cable slings to the lifting holes provided in the base rails. Spreaders, whose length exceeds the largest d imension a cross the un it, MUST be used acr oss the top of the unit.

BEFORE LIFTING A UNIT, MAKE SURE THAT ITS WEIGHT IS DISTRIBUTED EQUALLY ON THE CABLES SO THAT IT WILL LIFT EVENLY.

Units may also be moved or lifted with a forklift. Slotted openings in the base rails are provided for this purpose.

LENGTH OF FORKS MUST BE A MINIMUM OF 42". Remove the nesting brackets from the four corners on top of

the unit. All screws that are removed when taking these brackets off must be replaced on the unit.

CAUTION: An adhesive backed label is provided over the

outside of the co mbu st ion ai r in le t op en in g to prevent moisture from entering the unit whic h could cause damage to electrical components. Allow this closure label to remain in place until the combustion air hood i s to be installed (r efer to Figure 5).

Refer to Table 5 for unit weights and to Figure 8 for approximate center of gravity.

CLEARANCES

All units require certain clearances for proper operation and service. Installer must make provisions for adequate combustion and ventilation air in accordance with Section 5.3, Air for Combustion and Ventilation of the National Fuel Gas Code, ANSI Z223.1 (in U.S.A.) or Sections 7.2, 7.3 or 7.4 of Gas Installation Codes CAN/CGA-B149.1 and .2 (in Canada) and/or applicable provisions of the local building codes. Refer to Figure 9 for the clearances required for combustible construction, servicing, and proper unit op er ation.

WARNING: Do not permit overhanging structures or shrubs to

obstruct condenser air discharge outlet, combustion air inlet or vent outlet.

DUCTWORK

Ductwork should be designed and sized ac cording to the metho ds in Manual Q of th e Air Conditioning Contrac tors of America (ACCA).

A closed return duct system shall be used. This shall not preclude use of economizers or outdoor fresh air intake. The supply and return air duct connections at the unit should be made with flexible joints to minimize the transmission of noise.

Unitary Products Group 3

530.18-N8Y

The supply and return air duct systems should be designed for the CFM and static requirements of the job. They should NO T be sized to match the dimensions of the duct connections on the unit.

CAUTION: When fastening ductwork to the side duct flanges on

the unit, insert the screws through the duct flanges only . DO NOT insert the screws through the casing.

Outdoor ductwork must be insulated and waterproofed.

Refer to Fig ure 9 for i nformatio n concerni ng side and bo ttom supply and return air duct openings.

FILTERS

1" filters ar e supp lied with each un it. 2" r eplace ment filt ers m ay be used wi th no modification to th e filter racks. Filters must always be installed ahead of the evaporator coil and must be kept clean or re placed wit h same size and t ype. Dir ty filt ers will reduce the cap acit y of t he un it an d wi ll re sult in fros ted coil s or safety shutdown. Minimum filter area and required sizes are shown in Table 5.

CONDENSATE DRAIN

Plumbing must conform to local codes. Use a sealing compound on male pipe threads. Install a condensate drain line from the 3/4" PVC female connection on the unit to spill into an open drain.

NOTE: The condensate drain line MUST be tr apped to provi de

proper drainage. See Figure 1.

POWER AND CONTROL WIRING

Field wiring to the unit must conform to provisions of the National Electrical Code (NEC), ANSI / NFPA 70-1987 (in U.S.A.) current Canadian Electric Code (CEC) C22.1 (in Canada), and / or local ordinances. The unit must be electrically grounded in accordance with the N.E.C. ANSI / NFP A 70 or local codes.

Voltage tolerances which must be maintained at the compressor terminals during start-up and running conditions are indicated on the unit Rating Plate an d Table 1.

The internal wiring harness furnished with this unit is an integral part of a UL and CGA design certif ied unit. Fi eld altera tion to comply with electrical codes should not be required.

A disconnect switch shou ld b e fi eld provid ed f or the u nit. The switch must be separat e from al l other ci rcuits . Refer to Fi gure 9 for installation location. If any of the wire supplied with the unit must be replaced, replacement wire must be of the type shown on the wirin g di ag ra m .

Electrical lines must be sized properly to carry the load. USE COPPER CONDUCTORS ONLY. Each unit must be wired with a separate branch circuit fed directly from the meter panel and properly protected.

CAUTION: When connecting electrical power and control wir-

ing to the unit, w aterproo f type connecto rs MUST BE USED so that water or moisture cannot be drawn into t he unit during nor mal operation. The above waterproofing conditions will also apply when installing a field-supplied disconnect switch.

Refer to Figure 2 for typical field wiring and to the appropriate unit wiring diagram for control circuit and power wiring information.

FIG. 1

- RECOMMENDED DRAIN PIPING

SERVICE ACCESS

Access to all serviceable components is provided by the following removable panels:

•

Scroll compressor compartment

•

Burner compartment

•

Blower compartment

•

Main control bo x

•

Filter compartment

•

Motor access (on units with belt-drive option)

Refer to Figure 9 for location of these access panels.

CAUTION: Make sure that all scre ws a re re pl ac ed on the unit

to maintain an air-tight seal.

THERMOSTAT

The room thermostat should be located on an inside wall approximatel y 5 6" ab ove the flo or wh ere it will not be subj ect to drafts, sun exposure, or heat from electrical fixtures or appliances. Follow manufacturer’s instructions enclosed with thermostat for general installation procedure. Color coded insulated wires (#18 AWG) should be used to connect thermostat to unit. See Figure 2 for wiring details.

NOTE : If the unit has an economizer, remove jumper J1 from

terminals 8 and 10 on the relay board to prevent simultaneous operation of the scroll compressor and the economizer. If you want to energize the scroll compressor for supplemental cooling during the economizer operation, use a thermostat with two stages of cooling.

BLOWER SPEED SELECTION

Three blowe r motor spee ds are ava ilable on the direct- drive units. The speed selection for the direct-drive units is determined by the CFM and ESP requirements of the applications . All units with belt- driv e option have an adjust able motor pulley to achieve the above conditions.

All direct-drive units with 208/230 voltage are shipped with the wire labeled # 116 connected to the "HIG H" speed tap on the blower motor. If a lower blower motor speed is desired, this wire should be move d to the "MED" or "LOW " speed tap on the motor for the speed desired.

All direct-drive units with 460 and 575 voltage are shipped with the wire labeled #116 connected to the "HIGH" speed tap on the blower motor. If the medium speed is required, connect wire #116 to the "MED" speed tap and the blue motor lead to the "HIGH" speed ta p. If the low speed is required, conn ect wire #1 16 to the "LOW" sp eed tap, the blue mot or lead to the "H IGH" speed tap and t he orange motor lead to the " M ED" speed tap.

SCROLL COMPRESSOR

These units are shipped with the scroll compressor mountings factory-adjusted and ready for operation.

CAUTION: Do Not loosen the scroll compressor mounting bolts.

COMBUSTION DISCHARGE

The products of combustion are discharged horizontally through a screened opening on the gas heat access panel.

TABLE 2

Capacity,

(Mbh)

NOTE: Gas Heaters are shipped available for natural gas, but can be converted to L.P . with Kit Model No. 1NP0434. All furnaces meet the latest California seasonal efficiency requirements.

Based on 1075 Btu/Ft3.

The air flow must be adjusted to obtain a temperature rise within the range shown.

- GAS HEA T APPLICA T ION DATA

Input

50 40 3 Ton 47 15 45

75 60 4 Ton 70 25 55 100 79 3/5/6 Ton 93 40/25/25 70/55/55 125 99 4/5/6 Ton 116 45/35/35 75/65/65

Output

Capacity,

(Mbh)

Available

Models

Gas Rate

(Ft.3/Hr.)

Temp. Rise °F

At Full Input

Min. Max.

4 Unitary Products Group

COOLING / HEATING (24 VOLT THERMOSTAT )

THERMOSTAT

TERMINALS

UNIT TERMINAL

STRIP TB1

ADD JUMPER

24 VOLT

TRANSFORMER

TYPICAL CONTROL WIRING

COOLING / HEATING (24 VOL T ELECTRONIC THERMOSTAT)

THERMOSTAT

TERMINALS

ADD JUMPER

NOT USED

UNIT TERMINAL

STRIP TB1

530.18-N8Y

24 VOLT

TRANSFORMER

24 VOLT THERMOSTAT 2TH07701024. IF THE UNIT HAS AN ECONOMIZER, REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD TO PREVENT SIMULTANEOUS OPERATION OF THE SCROLL CO MPRESSOR AND THE ECONOMIZER. IF YOU WANT TO CONTROL THE ECONOMIZER ON A SECOND STAGE OF COOLING OR HAVE AN ELECTRIC HEAT ACCESSORY WITH TWO STAGES OF HEAT, USE THERMOSTAT 2TH04701024.

COOLING / HEATING (24 VOL T ELECTRONIC THERMOSTAT)

THERMOSTAT

TERMINALS

UNIT TERMINAL

STRIP TB1

ADD JUMPER

24 VOLT

TRANSFORMER

TYPICAL POWER WIRING

REFER TO ELECTRICAL DATA TABLES TO SIZE THE DISCONNECT SWITCH, WIRING & OVERCURRENT PROTECTION.

TO REMOTE SENSOR

ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET04700224 (INCLUDES SUBBASE) TO CONTROL ECONOMIZER ON SECOND STAGE OF COOLING, REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD.

SECOND STAGE COOLING IS NOT REQUIRED ON UNITS LESS ECONOMIZER.

SECOND STAGE HEATING IS ONLY REQUIRED ON UNITS WITH A TWO STAGE ELECTRIC HEATER.

REMOVE JUMPER J2 FROM TERMINALS 4 AND 9 ON JUMPER PLUG CONNECTOR P6 ON UNITS WITH ECONOMIZER. TERMINALS A1 AND A2 PROVIDE A RELAY OUT-PUT TO CLOSE THE OUTDOOR ECONOMIZER DAMPERS WHEN THE THERMOSTA T SWITCHES TO THE SET-BACK POSITION.

ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET07701024 (INCLUDES SUBBASE). IF THIS UNIT HAS AN ECONOMIZER, REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD TO PREVENT SIMUL TANEOUS OPERATION OF THE SCROLL COMPRESSOR AND THE ECONOMIZER. IF YOU WANT TO CONTROL THE ECONOMIZER ON A SECOND STAG E OF COOLING, USE THERMOSTAT 2ET04700224.

2TH04702224 IF USED

CAUTION: Label all wires prior t o disconnection when servic-

ing controls. Wiring errors can cause improper and dangerous op eration. Verify pro pe r operation af te r servicing.

REFER TO ELECTRICAL DATA TABLES TO SIZE THE DISCONNECT SWITCH, WIRING & OVERCURRENT PROTECTION.

FIG. 2

- TYPICAL FIELD WIRING

DISCONNECT SWITCH BRACKET FOR UNITS WITH OPTIONAL BELT-DRIVE BLOWER

the current Gas Installatio n Codes CAN/CGA-B149.1 and .2 ( in Canada) should be followed in all cases unless superseded by

local codes or gas com p an y re qu irements. Refer to Table 3. A special bracket for mounting a field-supplied disconnect switch is provided in each unit ordered with an optional belt-drive supply air blower. The bracket is shipped inside the blower compartment taped to the top of the blower housing. Install the bracket on the le ft hand side of the unit as sho w n in Figure 9. Several existing screws at the top of the unit and one screw approximately midway down from the top will be used for mounting t he brack et. Sc rews shou ld be lo osened on ly NOT REMOVED. Matching holes in the bracket have elongated keyways allowing easy installation. Re-tighten screws after bracket is in place to ensure panels will remain leak tight.

GAS PIPING

Proper sizing of gas p ipin g de pend s on the cub ic fee t pe r ho ur of gas flow required, specific gravity of the gas and the length of run. “National Fuel Gas Code” Z223-1992 (in the U.S.A.), or

Unitary Products Group 5

TABLE 3

Length in Feet

Maximum capacity of pipe in cubic feet of gas per hour. (Based upon a pressure drop of 0.3

inch water column and 0.6 spe ci fic gr avit y gas) .

- PIPE SIZING

10 20 30 40 50 60 70 80 90

100

Nominal Iron Pipe Size

1/2 in. 3/4 in. 1 in. 1-1/4 in.

132

92 73 63 56 50 46 43 40 38

278 190 152 130 115 105

96 90 84 79

520 350 285 245 215 195 180 170 160 150

1,050

730 590 500 440 400 370 350 320 305

530.18-N8Y

FIG. 3

- EXTERNAL SUPPLY CONNECTION EXTERNAL SHUT-OFF

FIG. 4

- BOTTOM SUPPLY CONNECTION EXTERNAL SHUT-OFF

The heating value of the gas may differ with locality. The value should be checke d w it h th e lo ca l gas utility.

NOTE: There may be a local gas utility requirement specifying

a minimum diameter for gas piping. All units require a 1/2 inch pipe connection at the entrance fitting.

GAS CONNECTION

The gas supply line can be routed through the knockouts located on the front of the unit or through th e opening pr ovided in the unit’s base. Refer to Figure 9 to locate these access openings. Typical supp ly piping arrangements a re shown in Figures 3 and 4. All shaded items are field-supplied.

Two grommets are shipped in the blower compartment (in parts bag taped to the blower housing) of every unit with gas heat and should be used in the knockouts when the gas piping penetrates the f ro nt of th e un it .

After the gas supply piping has been installed, the bottom opening shou ld be sealed to prevent water f rom leaking into the building.

Gas piping recommendations:

1. A drip leg and a ground joint union must be installed in the gas piping.

2. When required by local codes, a manual shut-off valve may have to be installed outside of the unit.

3. Use wrought iron or steel pipe for all gas lines. Pipe compound should be applied sparingly to male threads only.

WARNING:Natural gas may cont ain some pr op an e. Propane,

4. All piping should b e cleaned of dirt and scale by hamm ering on the outside of the pipe and blowing out the loose dirt and scale. Before initial start-up, be sure that all of the gas lines external to the unit have been purged of air.

5. The gas supply should be a separate line and installed in accordance with all safety codes as prescribed under “Limitations”. After the gas connections have been completed, o pen the main shut -off val ve ad mitting

gas pressu re

soap solution or other material su itable for the purpose. NEVER USE A FLAME.

being an excellent solvent, will quickly dissolve white lead or most standard commercial compounds. Therefore, a special pipe compound must be applied when wrought iron or steel pipe is used. Shellac base compounds such as Gaskolac or Stalastic, and compounds such as Rectorseal #5, Cyde’s or John Crane may be used.

normal

to the mains. Che ck all joint s for leaks wit h

6. The furnace and its individual manual shut-off valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig (3. 48kPa).

The furnace mu st be isolated from the gas supply piping system by closing its individual manual shut-off valve during any pressure t esting of th e gas supply piping syst em at te st pressures equa l to or le ss tha n 1/ 2 ps ig (3.48kPa).

7. A 1/8 inch NPT plug ged tappin g, acces sible for te st gage connection, must be installed immediately upstream of the gas supply connection to the furnace.

L.P./PROP ANE UNITS, TANKS AND PIPING

All gas heat units are shipped from the factory equipped for natural gas use only. The unit may be converted in the field for use with L.P./propane gas with accessory kit model number 1NP0440.

All L.P./propane gas equipment must conform to the safety standards of t he National Fi re Protection Asso ci ation.

For satisfactory operation, L.P ./propane gas pressure must be

10.5 inch W.C at the unit under full load. Maintaining proper gas

pressure depe nds on three main facto rs:

1. The vaporization rate which depends on (a) the temperature of t he liquid and (b) the “wetted surface” area of the container or containers.

2. The pr oper pressure regulat ion. (Two-stage regulation is recommended from the standpoint of both cost and efficiency.)

3. The pressure drop in the lines between regulators and between the second stage regulator and the appliance. Pipe size requi red wi ll depe nd on th e lengt h of th e pipe run and the total load of all appliances.

Complete information regarding tank sizing for vaporization, recommended regulator settings, and pipe sizing is available from most regulator manufacturers and L.P./propane gas suppliers.

L.P./propane gas is an excellent solvent and special pipe compound must be u se d whe n as se mbl ing pi pi ng for thi s ga s as it will quickly dissolve white lead or most standard commercial compounds. Shellac base compounds such as Rectorseal #5 are satisfactory for this type of gas.

Check all connections for leaks when piping is completed, using a soap soluti on . NEVER USE A FLAME.

LOW NOx APPLICA TION

For natural gas heat installations in locations which require low Nitros Oxide emiss ions, accessory model 1LN0 404 must be installed.

6 Unitary Products Group

+ 14 hidden pages