York D2CG300, D2CE User Manual
®
SUNLINE 2000
ELECTRIC / ELECTRIC & GAS / ELECTRIC
SINGLE PA CKAGE AIR CONDITIONERS
(Constant Air Volume)
INSTALLATION INSTRUCTION
208/230/460
VOLT ONLY
SAFETY CONSIDERATIONS
Due to system pressure, moving parts and electrical components,
installation and servicing of air conditioning equipment can be
hazardous. Only qualified, trained, service personnel should
install, repair, maintain or service this equipment.
‘YORK Model DCE and DCG units are single package air
conditioners d esig ned for outdoor inst alla tion on a roo ft op o r a
slab and is manufactured under ISO 9002 Quality System
Cert ification. The DCE models are coo ling only and can be
equipped with factory installed electric heaters for cooling /
heating applications. The DCG models are gas-fired central
heating furnaces wit h co ol in g.
The units are co mplete ly asse mbl ed on rig id, permanen tly at tach ed
base rails. All piping , refrigerant charge , and electrical wiring is factory
installed and test ed. All units require electric po wer , duct connections
and fixed outdoor air intake damper (units without economizer or
motorized damper option only) at the point of installation.
The DCG units ad ditionally req uire gas connecti on, installat ion of the
combustion air inlet hood and the flue gas outlet hoods at the point of
installation . The gas-fired h eaters ha ve al uminized-st eel tub ular heat
exchangers and spark ignition with proven pilot.
Supplemental electric heaters for DCE units have nickel-chrome
elements and utilize single point power connections.
The following safety precautions apply to DCG units:
FOR Y OUR SAFETY
If you smell gas:
1. Open windows.
2. Don’t touch electrical switches; do not use
any phones in the area of the gas leak.
3. Extinguish any open flame.
4. Immediatel y call y our gas supplier fr om another
location. Follow your gas supplier’s
instructions.
5. If you cannot reach y our gas supplier , call the
fire department.
Supersedes: 530.18-N11Y (195)
MODELS D2CE & D2CG300
(8.5 EER)
DCG MODEL
SHOWN
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 carrier’s freight
bill. A separate request for inspection by the carrier’s agent
should 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 equipment is available in the following reference forms:
44-320-10 - Barometric Relief Damper Accessory
•
530.18-N6.1V - Propane Conversion Accessory
•
530.18-N6.2V - High Altitude Accessory (Nat. Gas)
•
530.18-N6.3V - High Altitude Accessory (Propane)
•
530.18-n13y - Coil Guard In st al la ti on
•
Renewal Parts:
Refer to the Renewal Par ts Manual for comple te listing of
•
replacement parts on this equi pm ent.
All forms referenced in this instruction may be ordered from:
Publications Distribution Center
Unitary Products Group
P.O. Box 1592, York, Pa. 17405
APPROVALS
Design certified by ETL & CGA as follows:
1. For use as a central cooling only unit with or without
supplemental electric heat. (DCE models)
2. For use as a forced air furnace with cooling unit. (DCG models)
3. For use with natural gas or pro pa ne gas. (DCG mod el s)
4. For outdoor installat io n on ly.
5. For installation on combustible ma te ria l.
THIS PRODUCT MUST BE INSTALLED IN STRICT COMPLIANCE WITH
THE ENCLOSED INSTALLATION INSTRUCTIONS AND ANY
APPLICABLE LOCAL, ST ATE, AND NATIONAL CODES INCLUDING, BUT
NOT LIMITED TO , BUILDING, ELECTRICAL, AND MECHANICAL CODES.
CAUTION
530.18-N11Y (399)
035-16133
208/230/575
VOLT ONLY
Do not store o r use gasoline or ot her flammable
vapors and liquids in the vicinity of this or any
other appliance
Installer should pay particular attention to the words: NOTE, CAUTION and WARNING. Notes are inte nd ed t o clarify or m ake
the installa tion ea sier .
and/or equipment damage may result if installation pr ocedure is not handled properly.
FOR Y OUR SAFETY
INCORRECT INSTALLATION MAY CREATE A CONDITION
WHERE THE OPERATION OF THE PRODUCT COULD CAUSE
PERSONAL INJURY OR PROPERTY DAMAGE
.
Cautions are gi ven t o pre vent equipmen t damage . W arnings are giv en to ale rt installer that personal i njury
WARNING
530.18-N11Y
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
Fixed Outdoor Air Intake Damper........................................ 4
Condensate Drain................................................................4
Compressors........................................................................4
Filters ................................................................................... 4
Service Access .................................................................... 4
Thermostat...........................................................................5
Power and Control Wiring.................................................... 5
Optional Electric Heaters (DCE Models)............................. 5
Combustion Disch arge (DCG Model s)................................5
Gas Piping (DCG Models)................................................... 6
Gas Connection (DCG Models)........................................... 6
L.P. Units, Tanks and Piping (DCG Models)......................... 6
Vent and Combustion Air Hoods (DCG Model s) ................. 7
Econ. / Mot. Damp er Rai n Hoo d Accy. (1EH0401)..............7
Econ. / Power Rain Hood Accy. (1EH0402)......................... 9
OPERA T ION
Cooling System.................................................................. 15
Preliminary Opera tion Cooling........................................... 15
Cooling Sequence of Operation........... ..............................15
Safety Controls (Cooling)................................................... 15
Electric Heating - Sequence of Operation ......................... 15
Heating Anticipat or Set poin ts....... .. .. .................. .. .............16
Gas Heating - Sequence of Op er at io n......... .. .. .. .. .............16
Safety Contro ls (Heat ing). .................. .. .. .................. .. .. ...... 16
Heat Antici pator Setpoints ................................................. 17
Pre-Start Check List........................................................... 17
START-UP
Operating Instructions........................................................ 17
Post-Start Check List.........................................................17
Manifold Ga s Pressure Adjustment...................... .............17
Pilot Checkout.................................................................... 18
Burner Instructions.............................................................18
Burner Air Shutter Adjustment...........................................18
Checking Supply Air CFM....... .. .................. .. .. .................. .18
Adjustment of Temperature Rise........................................ 19
Checking Gas Input ........................................................... 19
Secure Owner’s Approval .................................................. 19
MAINTENANCE & TROUBLESHOO TING
Normal Maintenance ......................................................... 20
Cleaning Flue Passages and Heating Elements...............20
Troubleshooting.................................................................. 2 1
Replacement Parts ..................................... .................. .. ... 23
TABLES
No. Description Page
1 Unit Application Data.................................. 3
2 Gas Heat Application Data ......................... 6
3 Pipe Sizing.................................................. 6
4 Physical Data.............................................. 10
5 Electrical Data - Basic Units...................... 10
6 Electrical Data - Units Wi th Ele c. Heat ...... 10
7 Four and Six Point Loads............................ 13
8 Supply Air Blower Performance .............. ... 13
9 Static Resistances ...................................... 14
10 Pow er Exh au st Performance....... .. .. .. ......... 14
11 Blower Motor and Drive Data...................... 14
12 Heat Anticipator Setpoint............................ 16
13 Limit Control Setting ................................... 17
14 Gas Rate - Cubic Feet Per Hour................. 19
FIGURES
No. Description Page
1 Typical Rigging....... ........................ ............. 3
2 Center of Gravi ty............................. .. .......... 3
3 Fixed Out door Air Dam pe r.............. .. .. .. ...... 4
4 Recommended Drain Piping....................... 4
5 Typical Field Wiring ..................................... 5
6 External Supply Connection ....................... 6
7 Bottom Supply Connection......................... 7
8 Vent and Combustion Air Hoods................. 8
9 Adjusting Enthalpy Setpoint.................... .. .. 9
10 Dimensions and Clearan ces...... .. ............... 11
Dimensions and Clearances (cont’d).......... 12
11 Four and Six Point Loads............................ 13
12 Gas V a lv e Pipin g................ .... .... .... .. .... .... ... 16
13 Gas Valve and Controls .............................. 17
14 Typical Gas Valve................... .... ...... ...... ..... 17
15 Proper Flame Adjustment................ .. ......... 18
16 Typical Flam e App ea ra nc e........ ................. 18
17 Belt Adjustment............................ .. .. ........... 18
18 Pressure Drop versus Supply Air CFM ...... 19
19 Typical Flue Baffle Installation .......... .......... 20
PRODUCT NOMENCLATURE
D 2 C G E C4N
PRODUCT CATEGORY
D = Single Package Air Conditioner
(Air Cooled)
PRODUCT GENERATION
2 = 2nd Generation
PRODUCT IDENTIFIER
CG = Gas/Electric
CE = Cooling only or
Electric / Electric
NOMINAL COOLING
CAPACITY
300 = 25 Tons
2 Unitary Products Group
FACTORY INSTALLED
HEAT
A = No Heat
N = Natural Gas
E = Electric
2 003 0 2 5
NOMINAL HEATING
OUTPUT CAPACITY
GAS
240 = 240 MBH
320 = 320 MBH
ELECTRIC
018 = 18 KW
036 = 36 KW
054 = 54 KW
072 = 72 KW
FACTORY INSTALLED
OPTION CODE
EC = Sing. Input Economiz er
DK = Diff. Input Economiz er
FD = Sing. Input Economizer
w/Power Exhaust
CF = Diff. Input Economizer
w/Power Exhaust
BG = Motorized Outdoor Air
Damper
VOLTAGE CODE
25 = 208/230-3-60
46 = 460-3-60
58 = 575-3-60
INSTALLATION
LIMITATIONS
These units must be installed in accordance with the following
applicable national and local safety codes:
In U.S.A.:
1. Nati on al Elec trica l Cod e ANSI/ NFPA No. 70.
2. National Fuel Gas Code Z223.1.
3. Gas-Fired Central Furnace Standard ANSI Z21.47a.
4. Local gas and electric utility requirements.
In Canada:
1. Current Canadian Electrical Code C22.1.
2. Current Gas Installation Codes CAN/CGA-B149.1 and .2
3. Local plumbing and waste water codes.
4. Other applicable lo ca l co de s .
Refer to the Unit Application Data T able and to the Gas Heat Application
Data T ab le.
After installation, units with gas heat must be adjusted to obtain a
temperature rise within the range specified on the unit rating plate.
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 e xpense.
Size of unit for prop os ed in st al la ti on sh ou ld be ba se d on hea t
loss/heat g ain calcul ation made a ccording to the method s of
the Air Conditioning Contractors of America (ACCA).
This furnace is not to be used for temporary heating of buildings
or structures under construction.
TABLE 1
V oltage V ariation,
Min. / Max.
Supply Air CFM, Min. / Max. 8,000 / 12,000
Wet Bulb Temperature (°F) of Air on
Evaporator Coil, Min. / Max.
Dry Bulb T emperature (°F) of Air on
Condenser Coil, Min.
1
Utilization range “A” in accordance with ARI Standard 110.
2
A low ambient accessory is available for applica tio ns down to 0°F.
LOCATION
Use the following guidelines to sele ct a suitable location for
these units.
1. Unit is designed for outdoor installation only .
2. Condenser coils must have an unlimited supply of air.
3. For ground level installation, use a level concrete slab with
WARNING: Excessive exposure of this furnace to contami-
4. Roof structures must be able to support the weight of the
- UNIT APPLICATION DATA
208/230-3-60 187 / 253
1
Where a choice of location is possible, position the unit on
either north or east side of bu il di ng.
a minimum thickness of 4 inches. The length and width
should be at le ast 6 inc hes g rea ter t han the unit bas e ra ils .
Do not tie slab to the building foundation.
nated combus tion air may res ult in equipment d amage or personal injury. Typical contaminates include: permanent wave solutions, chlorinated
waxes and cleaners, chlorine based swimming
pool chemicals, water soft ening chemica ls, 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, ma sonry acid washing materials.
unit and its opti ons and/or accessori es. Unit must be installed on a solid level roof curb or appropriate angle iron
frame.
460-3-60 414 / 506
575-3-60 518 / 630
57 / 72
2
/ Max.
25 / 120
530.18-N11Y
CAUTION: If a unit is t o b e i ns tall ed on a ro of cu rb o r spec ia l
frame, gasketing mu st be applied to all surfaces
that come in contact with the unit underside.
5. Maintain lev el tole rance t o 1/2 " maximu m across the ent ire
length or width of the unit.
RIGGING AND HANDLING
Exercise care when moving the unit. Do not remove any
packaging until the unit is near the place of installation. Rig the
unit by attaching chain or cable slings to the round lifting holes
provided in t he base rails. Spreaders, wh ose length exceed s
the largest di mension ac ross the uni t,
be used acros s
MUST
the top of the unit.
Units may also be moved or lifted with a forklift, from the front
or rear only, providing that an accessory skid is used.
LENGTH OF FORKS MUST BE A MINIMUM OF 90".
CAUTION: On gas heating units, an adhesive backed label is
provided over the outside of the combustion air inlet
opening to prevent moisture from entering the unit
which could cause damage to electrical
components. Allow this closure label to remain in
place until the combustion air hood is to be
installed.
FIG. 1
- TYPICAL RIGGING
5
FIG. 2
- CENTER OF GRAVITY
4
136-1/4"
CLEARANCES
All units require certain clearances for proper operation and
service. Installer must make provisions for adequate combustion
and ventilation air in accordance with
Combustion and V entilation 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 Dimensions and
Clearances table for the clearances required for combustible
construction, servicing, and proper unit operation.
WARNING:Do not permit o verhanging struct ure s or sh rubs to
obstruct ou tdoor air discharge ou tlet, combustion
air inlet or vent outlets.
Section 5.3, Air for
Unitary Products Group 3
530.18-N11Y
DUCTWORK
Ductwork should be designed and sized according to the
methods in Manual Q of the Air Conditioning Contractors of
America (ACCA).
A closed return duct system shall be used. This shall not
preclude u se of ec onomizers or outd oor fres h air inta ke. The
supply and r eturn air duct connections at t he unit should be
made with flexible joints to minimize noise.
The supply and return air duct systems should be designed for
the CFM and static requirements of the job. They should
be sized to matc h the dime nsions of the duct connect ions on
the unit.
CAUTION: When fastening ductwork to side duct flanges on
unit, insert screws through duct flanges only. DO
NOT insert screws through casing.
Outdoor ductwork must be insulated and
waterproofed.
Refer to the Dimensions and Clearances figure for information
concerning side and bottom supply and return air duct openings.
It is recommended that, in Canada, the outlet duct on gas
heating units be provided with a removable access panel. It is
recommended that this opening be accessible when the unit
is installed in service, and of a size such that smoke or
reflected light may be observed inside the casing to indicate
the presence of leaks in the heat exchanger. The cover should
be attached in a ma nn er ad eq uate to preven t le ak ag e .
NOT
FIXED OUTDOOR AIR INTAKE DAMPER
FIG. 3
- FIXED OUTDOOR AIR DAMPER
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing
compound on male pipe threads. Install a condensate drain line
from the 1" NPT f emale connection on the unit to an op en drain.
This damper is shipped inside the return air compartment on units
that are not provided with an economizer or a motorized damper
option. It is completely assembled and ready for installation. A
damper baffle inside of the hood is adjustable to provide v ariable
amounts of outdoor air intake.
Gasketing and mounting screws are provided in a parts bag
attached to the hood assembly. Apply gasketing to the three
flange surfaces on the hood prior to installing the hood. Extend
gasketing 1/4" beyond the top and bottom of the two side
flanges to insure adequate sealing.
Adjusting the damper to the desired air flow may be done before
mounting the hood into position or (after installation) by
removing the front hood panel or the screen on the bottom of
the hood. Damper baffle in po siti on 1 will allow appr oximatel y
10% recirculated air f low , posit ion 2 appro ximatel y 15% and, to
allow approximately 25%, remove the damper baffle.
On units with
assembly o v er the o peni ng in the side retu rn air a ccess pane l.
Remove and discard the opening cover and the covering over
the hood moun ti ng h ol es (u se d for ship pi ng ) be fore inst al li ng .
Secure with the screws provided.
On units with side r eturn air appl ications, install th e damper
assembly on th e return air duc twork as close to the unit as
possible. Cut an opening 16" high by 18" wide in the ductwork
to accommodate the damper. Using the holes in the hood
flanges as a template, drill 9/64" dia. (#26 drill) holes into the
ductwork and secu re with the screws provide d.
CAUTION: If outdoor air intake will not be required on units
bottom return air appl icat ions , i nstall the d ampe r
with bottom return air applications, the damper
assembly s hould still be moun ted on the side return
air access panel, per the instructions above, to
insure mois ture is not drawn into the unit du ring
operation. The covering over the mounting holes
only need be removed. Do not remove the opening
cover.
FIG. 4 -
NOTE: The condensate drain line MUST be trapped to provide
RECOMMENDED DRAIN PIPING
proper drainage.
COMPRESSORS
Units are ship ped with comp ressor mounting s facto ry-adjusted
and ready for operation.
CAUTION: Do
Not loosen compressor moun ting bolts.
FILTERS
2" filters are su pplied with each uni t. Filt ers must alwa ys be installed
ahead of the evaporator coil and must be kept clean or replaced
with same size an d type. Dirty filters will redu ce the cap acity of t he
unit and will result in frosted coils or safety shutdown. Minimum filter
area and required si zes a re sho wn in t he Ph ysic al Dat a Table.
SERVICE ACCESS
Access to all serviceable components is provided by the
follo w in g rem o vable panels:
Compressor compartment
•
Electri c Heat compartment - DCE models
•
Gas Heat compartment (Two panels) - DCG models
•
Side Supply & Return Air compartments (Two panels)
•
Blower compartment (Three panels)
•
Main control box
•
Filter compartment
•
Outdoor Air compartment (Two panels)
•
Refer to th e Di mensio ns an d Cl eara nces fi gure for location of t hese
access panel s.
CAUTION: Make sure that all screws and panel latches are
replaced and properly positioned on the unit to
maintain an air-ti gh t se al.
4 Unitary Products Group
530.18-N11Y
CONTROL WIRE SIZES
Wire Size1 AWG. Gauge
22 20 19 18 16
25 40 50 65 100
Maximum Wire Length2 Feet
Notes:
1. Solid, Class II copper wire
FIG. 5
- TYPICAL FIELD WIRING
Unitary Products Group 5
530.18-N11Y
THERMOSTA T
The room thermostat should be located on an inside wall
approximately 56" above the floor where it will not be subject
to drafts, sun exposure or heat from electrical fixtures or
appliances. Follow manufacturer’s instructions enclosed with
thermostat for general installation procedure. Seven color
coded insulate d wires should be used to conn ect thermostat to
unit.
POWER AND CONTR OL WIRING
Field wiring to the unit must conform to provisions of the
National Electrical Code, ANSI / NFPA No. 70 (in U.S.A.),
current Cana dian Electrical Cod e C22.1 (in Canada) and/or
local ordinances. The unit must be electrically grounded in
accordance with NEC and CEC (as specified above) and/ or
local codes. Voltage tolerances which must be maintained at
the compressor terminals during starting and running
conditions are in dicated on the unit Ratin g Pla t e.
The internal wiring harness furnished with this unit is an integral
part of a ETL and CGA design certified unit. Field alteratio n to
comply with electrical codes should not be required.
A fused disconnect switch should be field provided for the unit.
The switch must be separate from all other circuits. Wire entry
at knockout openings require conduit fittings to comply with
NEC (in U.S.A.), CEC ( in Cana da) an d/or loc al co des. If any
of the wire suppl ied with the unit must be replaced, repla cement
wire must be of th e type shown on the wiring diagram and the
same minimum gauge as the replaced wire.
Electri cal line must be sized proper ly to carr y the load . Each
unit must be wired with a separate branch circuit fed directly
from the meter panel and properly fused.
CAUTION: When connecting electrical power and control
wiring to the unit, waterproof type connectors
MUST BE USED so that water or moisture cannot
be drawn into the unit during normal operat ion. The
above waterproofing conditions will also apply
when installing a field-supplied disconnect switch.
Refer to Typical Field Wiring Figure for typical field wiring and to
the appropriate unit wiring diagram for control circuit and power
wiring information.
OPTIONAL ELECTRIC HEATERS (DCE Models)
The factory installed heaters are wired for single point power
supply. Po wer supply need only be brought in to the singl e point
terminal block and thermostat w iring to the lo w volta ge terminal
block located in the upper portion of the unit control box.
These ETL an d CGA a pp roved he ater s ar e lo ca te d w ithi n th e
central compartment of the unit with the heater elements
extending into the supply air chamber. Refer to the Dimension
and Clearances figure for access panel location.
Fuses are supp li ed , whe r e req ui red , by the factory. Some KW
sizes require fuses and others do not. Refer to the Unit
Applicatio n Data Table 1 for minmum CFM limi tations an d to
Electrical Data T able.
TABLE 2
2,000 Feet
Sea Leve l
Max. Min. Max. Min. Max. Max. Min. Max.
300 150 270 135 240 213 279 20 50
400 200 360 180 320 281 372 30 60
NOTE: Heaters are shipped available for natural gas , but can be converted to
L.P. / Propane with Kit Model No. 1NP0418.
1
MBH rating should be red uce d at the ra te of 4 pe rce nt f o r ea ch 1, 000 feet above 4,500 feet.
2
Based on maximum input and 1075 Btu/Ft3.
3
The air flow must be adjusted to obtain a temperature rise within the range shown.
- GAS HEAT APPLICATION DATA
Input Capacity (Mbh) Output Capacity (Mbh)
0 T o
Above
2,000 To
4,500 Feet
Above
Sea Leve l
2,000 Feet
1
Sea Level
0 T o
Above
2,000 To
4,500 Feet
Above
Sea Leve l
1
Gas
Rate
(Ft.3/Hr.)
Temp.
2
Rise °F
At
Full Input
3
COMBUSTION DISCHARGE (DCG Models)
The products of combustion are discharged horizontally
through two screened (hooded) openings on the upper gas
heat access panel.
FIG. 6
- EXTERNAL SUPPLY CONNECTION
EXTERNAL SHUT-OFF
GAS PIPING (DCG Models)
Proper sizing of gas piping depends on the cubi c f eet pe r hour
of gas flow requir ed , sp ec ific gravity of th e ga s an d th e lengt h
of run. “National Fuel Gas Code” Z223.1 (in U.S.A.) or the
current Gas Installation Codes CAN/ CGA-B149.1 and .2 (in
Canada) should be followed in all cases unless superseded by
local codes or gas ut il ity requirements. See Pipe Sizin g t able.
The heating value of the gas may differ with locality. The value
should be chec ked with the local ga s ut ility.
NOTE : There may be a loca l gas utility requi rement specif ying
a minimum diameter for gas piping. All units re quire a
1 inch pipe connec ti on at th e entrance fitting.
TABLE 3
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 specific gravity gas).
- PIPE SIZING
Length in Feet
10
20
30
40
50
60
70
80
90
100
Nominal Iron Pipe Size
1 in. 1-1/4 in.
520
350
285
245
215
195
180
170
160
150
1,050
730
590
500
440
400
370
350
320
305
GAS CONNECTION (DCG Models)
The gas supply line can be routed through the knockouts
located on the front of the unit or through the opening provided
in the unit’s base. Typical supply piping arrangements are
shown in the Supp ly C onn ecti on fi gures. All pipe, fitt ings, e tc.
are field-supplied.
T wo 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
enters through the front of the unit.
After the gas supply piping has been installed, the bottom
opening in t he unit should be sealed to prevent water fro m
leaking into the building.
Gas piping recommendations:
1. A drip leg and a ground joint union must b e installed in t he
gas piping.
2. When required by local co des, a man ual shut-of f val ve ma y
have to be in st al led outside of the unit.
3. U se w rough t ir on or st eel pipe for all ga s lines. Pipe compound should be ap plied sparingly to male thre ad s on ly.
6 Unitary Products Group
FIG. 7
- BOTTOM SUPPLY CONNECTION
EXTERNAL SHUT-OFF
WARNING:Natural gas may contain some propane. Propane,
being an excellent solvent, will quickly dissolve
white lead or most standard commercial
compounds. Therefore, a special pipe com pound
must be applied when wrought iron or steel pipe is
used. Shellac base compounds such as Gask olac
or Stalastic, and compounds such as Rectorseal
#5, Cyde’s or John Crane ma y be us ed.
4. All piping should be clea ned of dirt and scale b y hammering
on the outside of th e pipe and bl owing out the loose dirt and
scale. Before i nitial start-up , be sure t hat al l of t he ga s lin es
external to the un it 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, open the main shut-off valve admitting normal
gas pressure to the mains. Check all joints for leaks with
soap solution or other material suitable for the purpose.
NEVER USE A FLAME.
6. T he fur nac e and its indiv idual m anual sh ut-off valve must
be disconnect ed fro m t he ga s sup ply p ipin g syst em d uring
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.48kPa).
The furnace must be isolated from the gas supply piping
system by closing its individual manual shut-off valve during
any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psig (3.48kPa).
7. A 1/8 inch NPT plugged tapping, accessible for test gage
connection, m ust be in st alle d imme dia tely upst ream o f t he
gas supply connection to the furnace.
530.18-N11Y
L.P. UNITS, TANKS AND PIPING (DCG Models)
All gas heat units are shipped from the factor y equipped for
natural gas use only. The unit may be converted in the field for
use with L.P./ propane gas with access ory kit model nu mber
1NP0418.
All L. P./propane gas equipment must conform to the safety
standards of the Nat io nal Fire Protection Association.
For satis factory operat ion, L.P ./propane gas pressure must be
8.8 inch W.C at the unit under full load. Maintainin g proper gas
pressure depends on three main factors:
1. The vaporization rate which depends on (a) the temperature of the li quid and (b) the “wetted sur face” area of the
container or containers.
2. The proper pressure regulation. (Two-stage regulation is
recommende d 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 required will depend on the length of the pipe run
and the total load of al l ap pl iances.
Complete infor mation 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 us ed w he n a ss em bling pi pi ng for this 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 solution. NEVER USE A FLAME.
Unitary Products Group 7
530.18-N11Y
VENT AND COMBUSTION AIR HOODS
(DCG Models)
Two vent hoods and a combustion air hood (with screens) are
shipped attached to the blower housing in the blower
compartment. Thes e hoods must be ins talled to as sure pro per
unit function. All hoods must be fastened to the outside of the
gas heat access panel with the screws provided in the bag also
attached to the blower housing.
The screen f or the comb ustion air i ntake hood is secured to the
inside of the access panel op en in g w it h four fa st eners and the
screws used f or moun ting the hood t o the pane l. The top flange
of this hood s li ps i n under the top o f t he access panel o pe ning
when installing. Refer to the V ent and Combustion Hood figure.
OPTIONAL ECONOMIZER/MOTORIZED DAMPER
RAIN HOOD
The instru ction for the optional economizer/motorized damper
rain hood can be found in form 44-320-2. Use these instructions
when field a ssembling an econom izer rain hood ont o a unit.
The outdoor and return air damp ers, the damper actuator, the
damper linkage, the outdoor and return air divider baffles, and
all the control sensors are factory mounted as part of the
"Fac to ry install ed " ec on om izer option.
ENTHALPY SET POINT ADJUSTMENT
Remove the economizer access panel from the unit to check
the following adjustments. Loosen but do not remove the two
panel latches .
Each vent hood is installed by inserting the top flange of the
hood into the s lotted op ening i n the acce ss panel and sec uring
in place.
SLOTTED
VENT AIR
OUTLET
HOODS
COMBUSTION
AIR INTAKE
HOOD
OPENINGS IN
ACCESS PANEL
GAS HEAT
ACCESS
PANELS
CAUTI ON: Extreme care must be ex ercise d in turning both the
setpoint and m inimum p osition adjustin g scre ws to
prevent twisting them off.
1. T he enthalpy set point may now be set by selecting the
desired se tpoint shown in the Ent halpy figure. Adjust a s
follows:
For a single en thalpy operation, carefully turn the set
•
point adjusting screw to the “A”, “B”, “C” or “D” setting
corresponding t o th e le tt ere d cu rve.
For a dual enthalpy operation, carefully turn the set point
•
adjusting screw fully clockwise past the “D” setting.
2. To check that the damper blades m ove smoothly without
binding, carefully turn the minimum position adjusting
screw fully cl ockwise and then energize and de -energize
terminals “R” to “G”. With terminals “R” to “G” energized,
turn the minimum position screw counterclockwise until the
desired mini mum position has been attained.
3. Replace the economizer access panel. Reposition the two
latches horizontally and retighten the screws.
POWER EXHAUST/BAROMETRIC RE LIEF DAMPER
AND RAIN HOOD OPTION
The instructions for the power exhaust/barometric relief
damper and ra in hood can be found in form 44-320-10. The
exhaust fan, all supporting brackets, angles, and the wiring are
factory installed as part of the power exhaust option.
All of the components, including the dampers, hardware, and
mounting inst ructions are shipp ed in a single p ackag e e xternal
FIG. 8
- VENT AND COMBUSTION AIR HOODS
from the unit. The hood must be field a ssemble d and installe d.
Power exhaust is not available as a field installed option.
8 Unitary Products Group
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