See the following page for a complete Table of Contents.
NOTES, CAUTIONS AND WARNINGS
The installer should pay particular attention to the words:
NOTE, CAUTION, and WARNING. Notes
clarify or make the installation easier. Cautions
to prevent equipment damage. Warnings
alert installer that personal injury and/or equipment damage may result if installation procedure is not handled
properly.
23 UNIT CONTROL BOARD FLASH CODES . . . . . . . . . . . . 51
Unitary Products Group3
GENERAL
YORK Model DM units are either single package air
conditions equipped with optional factory installed electric heaters, or single package gas-fired central heating
furnaces with cooling unit. Both are designed for outdoor installation on a rooftop or 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 electric power, gas connection, duct connections, installation of combustion air
inlet hood, flue gas outlet hoods and fixed outdoor air
intake damper (units without economizer or motorized
damper option only) at the point of installation.
The supplemental electric heaters have nickel-chrome
elements and utilize single point power connection.
These gas-fired heaters have aluminized-steel or
optional stainless steel, tubular heat exchangers with
spark ignition with proven pilot. All gas heaters are
shipped from the factory equipped for natural gas use,
but can be field converted to L.P./ Propane with Kit
Model # 1NP0418. See Gas Heat Application Data
Table.
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.
035-18940-000-B-1003
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury, death, or property damage.
- Do not store or use gasoline or other flamma-
ble vapors and liquids in the vicinity of this or
any other appliance.
- WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s instructions.
• If you cannot reach the gas supplier, call
the fire department.
- Installation and service must be performed by
a qualified installer, service agency or the
gas supplier.
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.
Observe all precautions in the literature, on labels and
tags accompanying the equipment whenever working
on air conditioning equipment. Be sure to follow all
other safety precautions that apply.
Wear safety glasses and work gloves, and follow all
safety codes. Use a quenching cloth and have a fire
extinguisher available for all brazing operations.
4Unitary Products Group
REFERENCE
Additional information on the design, installation, operation and service of this equipment is available in the
following reference forms:
• 035-13073-001 - High Altitude Accessory
(Nat. Gas)
• 035-08524-002 - High Altitude Accessory
(Propane)
RENEWAL PARTS
Refer to York USER'S MAINTENANCE and SERVICE
INFORMATION MANUAL Part Number 035-18843-
001.
THIS PRODUCT MUST BE INSTALLED IN
STRICT COMPLIANCE WITH THE
ENCLOSED INSTALLATION INSTRUCTIONS AND ANY APPLICABLE LOCAL,
STATE, AND NATIONAL CODES INCLUDING, BUT NOT LIMITED TO, BUILDING,
ELECTRICAL, AND MECHANICAL CODES.
APPROVALS
Design certified by CSA as follows:
• For use as a cooling unit only with or without optional electric heat.
• For use as a forced air furnace with cooling
unit
• For outdoor installation only.
• For installation on combustible material.
• For use with natural gas or propane gas.
IMPROPER INSTALLATION MAY CREATE A
CONDITION WHERE THE OPERATION OF
THE PRODUCT COULD CAUSE PERSONAL
INJURY OR PROPERTY DAMAGE.
The installer should pay particular attention to the
words: NOTE, CAUTION and WARNING. Notes are
intended to clarify or make the installation easier. Cautions are given to prevent equipment damage. Warnings are given to alert installer that personal injury and/
or equipment damage may result if installation procedure is not handled properly.
ED = Johnson UNT Controller, DFS, APS, Phase Monitor, & Coil Guard, Hinged Filter Door & Tooless Access Panels
EE = Johnson UNT Controller, DFS, APS & Technicoat Cond. Coil, Hinged Filter Door & Tooless Access Panels
EF = Johnson UNT Controller, DFS, APS, Technicoat Cond. Coil, & Phase Monitor, Hinged Filter Door & Tooless Access Panels
Read these instructions before continuing this appliance installation. This is an outdoor combination heating and cooling unit. The installer must assure that
these instructions are made available to the consumer
and with instructions to retain them for future reference.
1. Refer to the unit rating plate for the approved type
of gas for this unit.
2. Install this unit only in a location and position as
specified on Page 10 of these instructions.
3. Never test for gas leaks with an open flame. Use
commercially available soap solution made specifically for the detection of leaks when checking all
connections, as specified on Pages 8, 16, 17 and
40 of these instructions.
4. Always install unit to operate within the furnace's
intended temperature-rise range with the duct system and within the allowable external static pressure range, as specified on the unit name/rating
plate, specified on Page 42 of these instructions.
5. This equipment is not to be used for temporary
heating of buildings or structures under construction.
LIMITATIONS
These units must be installed in accordance with the
following national and local safety codes:
In U.S.A
.:
• National Electrical Code ANSI/NFPA No.
70.
• National Fuel Gas Code Z223.1.
• Gas-Fired Central Furnace Standard ANSI
Z21.47a.
• Local gas utility requirements.
In Canada
:
• Current Canadian Electrical Code C22.1.
• Current Gas Installation Codes CSAB149.1.
• Local plumbing and waste water codes.
• Other applicable local codes.
Refer to the Unit Application Data table and to the Gas
Heat Application Data table.
FIRE OR EXPLOSION HAZARD
FAILURE TO FOLLOW THE SAFETY WARNING EXACTLY COULD RESULT IN SERIOUS
INJURY, DEATH OR PROPERTY DAMAGE.
NEVER TEST FOR GAS LEAKS WITH AN
OPEN FLAME. USE A COMMERICALLY
AVAILABLE SOAP SOLUTION MADE SPECIFICALLY FOR THE DETECTION OF
LEAKS TO CHECK ALL CONNECTIONS. A
FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL
INJURY OR LOSS OF LIFE.
After installation, the unit 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 expense.
Size of unit for proposed installation should be based
on heat loss/heat gain calculation made according to
the methods of the Air Conditioning Contractors of
America (ACCA).
This equipment is not to be used for temporary heating
of buildings or structures under construction.
International
:
• Local Government/Agency Regulations
8Unitary Products Group
035-18940-000-B-1003
TABLE 1: UNIT APPLICATION DATA
UNIT MODEL NUMBERDM180DM240DM300
Voltage Variation,
Min. / Max.
Supply Air CFM, Min. / Max.4,500 / 7,2006,000 / 9,4007,500 / 12,500
Wet Bulb Temperature (ºF) of Air on
Evaporator Coil, Min. / Max.
Dry Bulb Temperature (ºF) of Air on
Condenser Coil, Min. / Max.
1.
Utilization range “A” in accordance with ARI Standard 110.
1
380/415-3-50342/456
LOCATION
Use the following guidelines to select a suitable location for these units.
57 / 72
0 / 125
1. Unit is designed for outdoor installation only.
2. Condenser coils must have an unlimited supply of
air.
3. Where a choice of location is possible, position the
unit on either north or east side of building.
4. For ground level installation, use a level concrete
slab with a minimum thickness of 4 inches. The
length and width should be at least 6 inches
greater than the unit base rails. Do not tie slab to
the building foundation.
5. 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.
6. Maintain level tolerance to 1/2 inch maximum
across the entire length or width of the unit.
Excessive exposure of this furnace to contaminated combustion air may result in 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.
If a unit is to be installed on a roof curb or special frame
other than a YORK roof curb, gasketing must be
applied to all surfaces that come in contact with the unit
underside.
Unitary Products Group9
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 the base rails.
Spreaders, whose length exceeds the largest dimension across the unit, MUST BE USED. Refer to
Figure 1.
Units may also be moved or lifted with a forklift, from
the side only, providing that an accessory skid is used.
LENGTH OF FORKS MUST BE A MINIMUM OF 90".
035-18940-000-B-1003
Refer to the Physical Data Table 7 for unit weights and
to the Figures 2 or 12 for approximate center of gravity.
Before lifting a unit, make sure that all panels
are in place and that its weight is distributed
equally on all cables so it will lift evenly.
FIGURE 2 - CENTER OF GRAVITY
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 (refer
to Vent and Combustion Hood Figure 8).
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
CSA-B149.1 (in Canada) and/or applicable provisions
of the local building codes. Refer to Dimensions and
Clearances Figure 13 for the clearances required for
combustible construction, servicing, and proper unit
operation.
FIGURE 1 TYPICAL RIGGING
10Unitary Products Group
035-18940-000-B-1003
Do not permit overhanging structures or shrubs
to obstruct outdoor air discharge outlet, combustion air inlet or vent outlets.
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 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
noise.
The supply and return air duct systems should be
designed for the CFM and static requirements of the
job. They should NOT be sized to match the dimensions of the duct connections on the unit.
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 Dimensions and Clearances Figure 13 for
information concerning side and bottom supply and
return air duct openings.
FIXED OUTDOOR AIR INTAKE DAMPER
This damper is shipped inside the return air compartment. It is completely assembled and ready for installation. A damper baffle inside of the hood is adjustable to
provide variable amounts of outdoor air intake on units
that are not provided with an economizer or a motorized damper option. Refer to the Fixed Outdoor
Damper Figure 3.
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 inch 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
position 1 will allow approximately 10% outdoor air
flow, position 2 approximately 15% and, to allow
approximately 25%, remove the damper baffle.
On units with bottom return air application install the
damper assembly over the opening in the side return
air access panel. Remove and discard the opening
cover and the covering over the hood mounting holes
(used for shipping) before installing. Secure with the
screws provided.
On units with side return air applications, install the
damper assembly on the return air ductwork as close
to the unit as possible. Cut an opening 16 inches high
by 18 inches wide in the 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.
NOTE: It is recommended that, in Canada, the outlet
duct 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 manner
adequate to prevent leakage.
Unitary Products Group11
If outdoor air intake will not be required on
units with bottom return air applications, the
damper assembly should still be mounted on
the side return air access panel, per the
instructions above, to insure moisture is not
drawn into the unit during operation. The covering over the mounting holes only need be
removed. Do not remove the opening cover.
FIGURE 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 one-inch NPT female connection on
the unit to an open drain.
NOTE: The condensate drain operates in a negative
pressure in the cabinet. The condensate drain
line MUST be trapped to provide proper drainage. See Figure 4.
035-18940-000-B-1003
COMPRESSORS
Units are shipped with compressor mountings factoryadjusted and ready for operation.
Do not loosen compressor mounting bolts.
FILTERS
Two-inch or four-inch filters can be supplied with each
unit. Filters must always be installed ahead of the
evaporator coil and must be kept clean or replaced with
same size and type. Dirty filters will reduce the capacity
of the unit and will result in frosted coils or safety shutdown. Minimum filter area and required sizes are
shown in Physical Data Table 7.
SERVICE ACCESS
The following removable panels provide access to all
serviceable components:
• Compressor compartment
• Electric Heat compartment
• Gas Heat compartment (Two panels)
• Side Supply & Return Air compartments
(Two panels)
• Blower compartment (Three panels)
• Main control box
• Filter compartment
• Outdoor Air compartment (Two panels)
FIGURE 4 - RECOMMENDED DRAIN PIPING
12Unitary Products Group
Refer to the Dimensions and Clearances Figure 13 for
location of these access panels.
Make sure that all screws and panel latches
are replaced and properly positioned on the
unit to maintain an airtight seal.
035-18940-000-B-1003
THERMOSTAT
TERMINALS
W1
1
W2
Y1
2
Y2
G
R
C
4
RC
5
OCC
6
X
TERMINALS ON
A LIMITED
NUMBER OF
THERMOSTATS
1
Second stage heating not required on single stage heating units.
2
Second stage cooling not required on single stage cooling units.
3
Jumper is required if there is no Smoke Detector circuit.
4
Jumper is required for any combination of R, RC, or RH.
5
OCC is an output from the thermostat to indicate the Occupied condition.
6
X is an input to the thermostat to display Error Status conditions.
CONTROL
TERMINAL
BLOCK
W1
W2
Y1
G
OCC
P
P1
Y2
X
R
SD
C
SD
SD
Smoke
Detector
Jumper
3
24 VAC
Class 2
R
C
FIGURE 5 - FIELD WIRING - DM ELECTRIC/ELECTRIC AND GAS/ ELECTRIC UNITS
Unitary Products Group13
035-18940-000-B-1003
THERMOSTAT
The room thermostat should be located on an inside
wall approximately 56 inches 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. A minimum of seven color-coded
insulated wires (#18 AWG) should be used to connect
thermostat to unit.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of
the National Electrical Code, ANSI / NFPA No. 70 (in
U.S.A.), current Canadian Electrical Code 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
indicated on the unit Rating Plate and the Unit Application Data table.
The internal wiring harness furnished with this unit is
an integral part of a CSA design certified unit. Field
alteration 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 Canada) and/or local codes. Refer to the Dimensions and
Clearances Figure 13 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 wiring diagram and the same minimum gauge as the
replaced wire.
Electrical line 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 fused.
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
operation. The above waterproofing conditions
will also apply when installing a field-supplied
disconnect switch.
Refer to the Typical Field Wiring Figure 5 and to the
appropriate unit wiring diagram for control circuit and
power wiring information.
TABLE 2: CONTROL WIRE SIZES
Wire Size
18 AWG150 Feet
1.
From the unit to the thermostat and back to the unit.
Maximum Length
1
OPTIONAL ELECTRIC HEAT
The factory-installed heaters are wired for single point
power supply. Power supply need only be brought into
the single point terminal block and thermostat wiring to
the low voltage terminal strip located in the upper portion of the unit control box.
These CSA approved heaters are located within the
central compartment of the unit with the heater elements extending into the supply air chamber. Refer to
Figure 13 for access panel location.
Fuses are supplied, where required, by the factory.
Some KW sizes require fuses and others do not. Refer
to Table 3 for minimum CFM limitations and to Tables 8
and 9 for electrical data.
TABLE 3: ELECTRIC HEAT APPLICATION DATA
NOMINAL
HEATER SIZE
(KW)
18380/415450060007500
36380/415450060007500
54380/415500060007500
72380/415500060007500
14Unitary Products Group
VOLTAGE
3-PHASE,
50 HZ
MINIMUM CFM UNIT SIZE
15 TON20 TON25 TON
035-18940-000-B-1003
OPTIONAL GAS HEAT
These gas-fired heaters have aluminized-steel or
optional stainless steel, tubular heat exchangers with
spark ignition with proven pilot.
All gas heaters are shipped from the factory equipped
for natural gas use, but can be field converted to L.P./
Propane with Kit Model # 1NP0418. See Gas Heat
Application Data Table.
TABLE 4: GAS HEAT APPLICATION DATA
0 To
2,000 Feet
Above
Sea Level
Max.Min.Max.Min.Max.Max.Min.Max.
30015027013524021315, 20 & 25 Ton2792050
40020036018032028115, 20 & 25 Ton3723060
2,000 To
4,500 Feet
Above
Sea Level
GAS PIPING
Proper sizing of gas piping depends on the cubic feet
per hour of gas flow required, specific gravity of the gas
and the length of run. "National Fuel Gas Code" Z223.1
(in U.S.A.) or the current Gas Installation Codes CSAB149.1 (in Canada) should be followed in all cases
unless superseded by local codes or gas utility requirements. Refer to the Pipe Sizing Table 5.
Output Capacity (Mbh)
0 To
2,000 Feet
Above
Sea Level
2,000 To
4,500 Feet
Above
Sea Level
Te mp .
Available
on Models
Gas
Rate
(Ft./Hr.)
Rise ºF
At
Full Input
GAS CONNECTION
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. Refer to the
Dimensions and Clearances Figure 13 to locate these
access openings. Typical supply piping arrangements
are shown in the figures on page 16. All shaded items
are field-supplied.
The heating value of the gas may differ with locality.
The value should be checked with the local gas utility.
NOTE: There may be a local gas utility requirement
specifying a minimum diameter for gas piping.
All units require a one-inch pipe connection at
the entrance fitting.
TABLE 5: PIPE SIZING
Length in Feet
105201,050
20350730
30285590
40245500
50215440
60195400
70180370
80170350
90160320
100150305
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).
Nominal Iron Pipe Size
1 in.1-1/4 in.
If gas supply line is routed through the unit's base
ensure that the burner assembly can be removed for
maintenance without disturbing the supply line. The
supply piping and fittings must lie below the bottom gas
manifold to avoid interference with the burner assembly.
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 front of the unit.
After the gas supply piping has been installed, the bottom opening in the unit should be sealed to prevent
water from 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.
Unitary Products Group15
035-18940-000-B-1003
supply piping system at test pressures equal to or
less than 1/2 psig (3.48kPa).
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
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, Clyde's 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 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, 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.
7. A 1/8 inch NPT plugged tap, accessible for test
gage connection, must be installed immediately
upstream of the gas supply connection to the furnace.
FIGURE 6 - EXTERNAL SUPPLY CONNECTION
EXTERNAL SHUT-OFF
FIRE OR EXPLOSION HAZARD
FAILURE TO FOLLOW THE SAFETY WARNING EXACTLY COULD RESULT IN SERIOUS
INJURY, DEATH OR PROPERTY DAMAGE.
NEVER TEST FOR GAS LEAKS WITH AN
OPEN FLAME. USE A COMMERICALLY
AVAILABLE SOAP SOLUTION MADE SPECIFICALLY FOR THE DETECTION OF
LEAKS TO CHECK ALL CONNECTIONS. A
FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL
INJURY OR LOSS OF LIFE.
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 must be isolated from the gas supply
piping system by closing its individual manual shutoff valve during any pressure testing of the gas
FIGURE 7 - BOTTOM SUPPLY CONNECTION
EXTERNAL SHUT-OFF
L.P. 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 1NP0418.
All L.P./propane gas equipment must conform to the
safety standards of the National Fire Protection Association.
16Unitary Products Group
Loading...
+ 36 hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.