Unit Installation; Typical Installation With Required Clearances; Maximum / Minimum Operating Limit Conditions - York YZF Installation Manual

835966-UIM-E-0814
INSPECTION
As soon as a unit is received, it should be inspected for possible dam-
age during transit. If damage is evident, the extent of the damage
should be noted on the carrier's delivery receipt. A separate request for
inspection by the carrier's agent should be made in writing. See Local
Distributor for more information.
Requirements For Installing/Servicing R-410A Equipment
• Gauge sets, hoses, refrigerant containers, and recovery system
must be designed to handle POE oils, and the higher pressures
of R-410A.
• Manifold sets should be 800 PSIG high side and 250 PSIG low
side with 550 PSIG low side restart.
• All hoses must have a 700 PSIG service pressure rating.
• Leak detectors should be designed to detect HFC refrigerant.
• Recovery equipment (including refrigerant recovery containers)
must be specifically designed to handle R-410A.
• An R-22 TXV (thermostatic expansion valve) must not be used.
• A liquid-line filter drier is required on every unit.
LIMITATIONS
The unit should be installed in accordance with all National, State and
Local Safety Codes and the limitations listed below:
1. Limitations for the indoor unit, coil and appropriate accessories must
also be observed.
2. The outdoor unit must not be installed with any duct work in the air
stream. The outdoor fan is the propeller type and is not designed to
operate against any additional external static pressure.
3. The maximum and minimum conditions for operation must be
observed to assure a system that will give maximum performance
with minimum service. Refer to the dry bulb (DB) and wet bulb (WB)
temperature limitations in Table 1.
.
TABLE 1: Maximum / Minimum Operating Limit Conditions
AIR TEMPERATURE AT
OUTDOOR COIL, °F
Min. Max.
DB DB DB DB
Cool Heat Cool Heat
50 -10 115 75
1. Operation below this temperature is permissible for a short period
of time, during morning warm-up.
1.
4. The 2 stage units are not designed to operate with a low ambient kit.
The 2 stage models which can not operate with a low ambient kit
include YZF060, HC6B060, HL6B060, all YZH, all HC8B, and all
HL8B. Do not modify the control system of these models to operate
with any kind of low ambient kit.
5. The maximum allowable line length for this product is 75 feet.
NOTE: ALL OUTDOOR WIRING MUST BE WEATHERPROOF
FIGURE 1: Typical Installation with Required Clearances
2
AIR TEMPERATURE AT
INDOOR COIL, °F
Min. Max.
WB DB WB DB
Cool Heat Cool Heat
1
57 72 80
50
THERMOSTAT
TO INDOOR
NEC CLASS 2
BLOWER
WIRING
TO COIL
SEAL OPENINGS WITH
PERMAGUM OR EQUIVALENT
SECTION III: UNIT INSTALLATION
LOCATION
Before starting the installation, the suitability of the locations for both the
indoor and outdoor units need to be checked. All required limitations
and clearances must be observed. The outdoor unit must have suffi-
cient clearance for air entrance to the condenser coil, for air discharge,
and for service access as shown in Figure 1.
For multiple unit installations, units must be spaced a minimum of 24
inches apart. (Coil face to coil face.)
If the unit is to be installed on a hot sun exposed roof or a paved
ground area that is seasonally hot, the unit should be raised sufficiently
above the roof or ground to avoid taking the accumulated layer of hot
air into the outdoor unit.
Provide adequate structural support.
ADD-ON REPLACEMENT/RETROFIT
When this unit is being used as a replacement for an R-22 unit, it is
required that the outdoor unit, indoor coil, and metering device all be
replaced. The following steps should be performed in order to insure
proper system operation and performance. Line-set change out is also
recommended.
1. Change-out of the indoor coil to an approved R-410A coil/ condens-
ing unit combination with the appropriate metering device.
2. Change-out of the line-set when replacing an R-22 unit with an
R410-A unit is highly recommended to reduce cross-contamination
of oils and refrigerants.
3. If change-out of the line set is not practical, then the following pre-
cautions should be taken.
• Inspect the line set for kinks, sharp bends, or other restrictions,
and for corrosion.
• Determine if there are any low spots in the line set which might
cause oil traps.
• Flush the line set with a commercially available flush kit to
remove as much of the existing oil and contaminants as possi-
ble.
• Install a suction line filter-drier to trap any remaining contami-
nants, and remove it after 50 hours of operation.
4. If the outdoor unit is being replaced due to a compressor burnout,
then installation of a 100% activated alumina suction-line filter drier
in the suction-line is required, in addition to the factory installed liq-
uid-line drier. Operate the system for 10 hours. Monitor the suction
drier pressure drop. If the pressure drop exceeds 3 psig, replace
both the suction-line and liquid-line driers. After a total of 10 hours
run time where the suction-line pressure drop has not exceeded 3
psig, replace the liquid line drier, and remove the suction-line drier.
During the contamination removal procedure, never leave a suction
line drier in the system longer than 50 hours of run time.
60" OVERHEAD
NEC CLASS 1
CLEARANCE
WIRING
WEATHERPROOF
DISCONNECT
SWITCH
NOTICE
10" CLEARANCE
AROUND PERIMETER
24" SERVICE
ACCESS
CLEARANCE
A0216-001
Johnson Controls Unitary Products