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361819-YIM-A-0208

4

Unitary Products Group

PRECAUTIONS DURING BRAZING OF LINES

All outdoor unit and evaporator coil connections are copper-to-copper
and should be brazed with a phosphorous-copper alloy material such
as Silfos-5 or equivalent. DO NOT use soft solder. The outdoor units
have reusable service valves on both the liquid and vapor connections.
The total system refrigerant charge is retained within the outdoor unit
during shipping and installation. The reusable service valves are pro-
vided to evacuate and charge per this instruction.

Serious service problems can be avoided by taking adequate precau-
tions to assure an internally clean and dry system.

PRECAUTIONS DURING BRAZING SERVICE VALVE

Wrap a wet rag around the service valve as shown in Figure 4 to pre-
vent heat damage. Also, protect all painted surfaces, insulation, and
plastic base during brazing. After brazing cool joint with wet rag.

Valve can be opened by removing the plunger cap and fully inserting a
hex wrench into the stem and backing out counter-clockwise until valve
stem just touches the chamfered retaining wall.

Connect the refrigerant lines using the following procedure:

1.

Remove the cap and Schrader core from both the liquid and vapor
service valve service ports at the outdoor unit. Connect low pres-
sure nitrogen to the liquid line service port.

2.

Braze the liquid line to the liquid valve at the outdoor unit. Be sure
to wrap the valve body with a wet rag. Allow the nitrogen to con-
tinue flowing. Refer to the Tabular Data Sheet for proper liquid line
sizing.

3.

Carefully remove the rubber plugs from the evaporator liquid and
vapor connections at the indoor coil.

4.

Braze the liquid line to the evaporator liquid connection. Nitrogen
should be flowing through the evaporator coil.

5.

Slide the grommet away from the vapor connection at the indoor
coil. Braze the vapor line to the evaporator vapor connection. After
the connection has cooled, slide the grommet back into original
position. Refer to the Tabular Data Sheet for proper vapor line siz-
ing.

6.

Protect the vapor valve with a wet rag and braze the vapor line
connection to the outdoor unit. The nitrogen flow should be exiting
the system from the vapor service port connection. After this con-
nection has cooled, remove the nitrogen source from the liquid fit-
ting service port.

7.

Replace the Schrader core in the liquid and vapor valves.

8.

Go to “SECTION IV” for TXV installation.

9.

Leak test all refrigerant piping connections including the service
port flare caps to be sure they are leak tight. DO NOT OVER-
TIGHTEN (between 40 and 60 inch - lbs. maximum).

10. Evacuate the vapor line, evaporator and the liquid line, to 500

microns or less.

NOTE: 

Line set and indoor coil can be pressurized to 250 psig with dry

nitrogen and leak tested with a bubble type leak detector. Than
release the nitrogen charge.

NOTE: 

Do not use the system refrigerant in the outdoor unit to purge or

leak test.

11.

Replace cap on service ports. Do not remove the flare caps from
the service ports except when necessary for servicing the system.

12. Release the refrigerant charge into the system. Open both the liq-

uid and vapor valves by removing the plunger cap and with an
allen wrench back out counter-clockwise until valve stem just
touches the chamfered retaining wall. See Page 4 "PRECAU-
TIONS DURING BRAZING SERVICE VALVE".

13. Replace plunger cap finger tight, then tighten an additional 1/12

turn (1/2 hex flat). Cap must be replaced to prevent leaks.

 FIGURE 3: 

Underground Installation

 Dry nitrogen should always be supplied through the tubing while it
is being brazed, because the temperature required is high enough
to cause oxidation of the copper unless an inert atmosphere is pro-
vided. The flow of dry nitrogen should continue until the joint has
cooled. Always use a pressure regulator and safety valve to insure
that only low pressure dry nitrogen is introduced into the tubing.
Only a small flow is necessary to displace air and prevent oxidation.

This is not a backseating valve. The service access port has a
valve core. Opening or closing valve does not close service access
port.
 If the valve stem is backed out past the chamfered retaining wall,
the O-ring can be damaged causing leakage or system pressure
could force the valve stem out of the valve body possibly causing
personal injury.

TO INDOOR COIL

TO O UTDOOR UNIT

LIQUID LINE

CAP

PVC

CONDUIT

INSULATED

VAPOR LINE

 FIGURE 4: 

Heat Protection

The evaporator is pressurized.

 Do not connect manifold gauges unless trouble is suspected.
Approximately 3/4 ounce of refrigerant will be lost each time a stan-
dard manifold gauge is connected.

Summary of Contents for YZE03811 SERIES

Page 1: ...ty dam age Improper installation may create a condition where the operation of the product could cause personal injury or property damage Improper installation adjustment alteration service or mainte nance can cause injury or property damage Refer to this manual for assistance or for additional information consult a qualified con tractor installer or service agency This product must be installed i...

Page 2: ...ground area 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 an 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 performe...

Page 3: ...ll a line will result in loss of capacity and other problems caused by insufficient refrigerant flow Slope horizontal vapor lines at least 1 every 20 feet toward the out door unit to facilitate proper oil return PRECAUTIONS DURING LINE INSTALLATION 1 Install the lines with as few bends as possible Care must be taken not to damage the couplings or kink the tubing Use clean hard drawn copper tubing ...

Page 4: ...rvice port connection After this con nection has cooled remove the nitrogen source from the liquid fit ting service port 7 Replace the Schrader core in the liquid and vapor valves 8 Go to SECTION IV for TXV installation 9 Leak test all refrigerant piping connections including the service port flare caps to be sure they are leak tight DO NOT OVER TIGHTEN between 40 and 60 inch lbs maximum 10 Evacua...

Page 5: ...ertical run the bulb should be located at least 16 inches from any bend and on the tub ing sides opposite the plane of the bend The bulb should be positioned with the bulb tail at the top so that the bulb acts as a reservoir c Bulb should be insulated using thermal insulation provided to protect it from the effect of the surrounding ambient tempera ture SECTION V ELECTRICAL CONNECTIONS GENERAL INF...

Page 6: ...educed air flow lowering evaporator temperature and increasing latent capacity The humidistat in this control opens the humidistat contacts on humidity rise To install refer to instructions packaged with the acces sory and Figures 7 12 Prior to the installation of the dehumidification control the jumper across the HUMIDISTAT terminals on the indoor variable speed air handler or furnace CFM selecti...

Page 7: ...tage Aux Heat W2 Second Stage Aux Heat DHM Dehumidistat HM Humidistat O Reversing Valve Energized in Cool Change FFuel jumper on the heat pump control to ON Part Numbers SAP Legacy 126768 031 09137 18395 031 01996 340512 031 09178 1 1 Part Numbers SAP Legacy 265904 031 09169 2 C 24 Volt Common R 24 Volt Hot Y1 Single Stage Compressor TWO STAGE VARIABLE SPEED FURNACE CONTROL G Fan TWO STAGE VARIABL...

Page 8: ... to YES if humidistat is to be used PV 8 9 ID MODELS F L 8 9 V YORKGUARD VI CONTROL G L 8 9 V YZE OD MODELS YZH H 5 H 8 C 24 Volt Common R 24 Volt Hot Y1 First Stage Compressor O Reversing Valve Energized in Cool L Malfunction Light Y2 Second Stage Compressor G Fan DN22H00124 DP22U70124 THERMOSTAT E W1 First Stage Aux Heat W2 Second Stage Aux Heat C 24 Volt Common Y First Stage Compressor O B Reve...

Page 9: ...9481 031 09157 2 COM 24 Volt Common R 24 Volt Hot W1 First Stage Aux Heat W2 Second Stage Aux Heat Y1 Single Stage Compressor Y Y2 Second or Full Stage Compressor O Reversing Valve Energized in Cool X L Malfunction Light HUM Dehumidification Open on Humidity Rise VARIABLE SPEED AIR HANDLER CONTROL G Fan Move the MODE jumper to HP Move the HUM STAT jumper to YES if humidistat is to be used VARIABLE...

Page 10: ...ype must be set to 12 3 Heat 2 Heat Pump Thermostat Installer Setup 0190 Changeover Valve must be set to 0 O B terminal Energized in Cooling Thermostat Installer Setup 0200 Backup Heat Source must be set to 0 Heat Pump Backup Heat Source is Electric AUX Auxiliary Heat 1 24VAC Humidifier Optional Part Numbers SAP Legacy 159481 031 09157 2 COM 24 Volt Common R 24 Volt Hot W1 First Stage Aux Heat W2 ...

Page 11: ...e Aux Heat DHM Dehumidistat HM Humidistat O Reversing Valve Energized in Cool C 24 Volt Common R 24 Volt Hot Y1 Single Stage Compressor VARIABLE SPEED MODULATING FURNACE CONTROL G Fan VARIABLE SPEED MODULATING FURNACE Y Y2 Second or Full Stage Compressor HUM Dehumidification Open on Humidity Rise W Modulating Heat Change FFuel jumper on the heat pump control to ON 1 Part Numbers SAP Legacy 171334 ...

Page 12: ...1 01996 340512 031 09178 1 PC 8 9 ID MODELS FC 8 9 C FL 8 9 C YZE OD MODELS YZH H 5 H 8 C 24 Volt Common R 24 Volt Hot Y1 First Stage Compressor O Reversing Valve Energized in Cool L Malfunction Light Y2 Second Stage Compressor G Fan DN22H00124 DP22U70124 THERMOSTAT E W1 First Stage Aux Heat W2 Second Stage Aux Heat C 24 Volt Common Y First Stage Compressor O B Reversing Valve L Malfunction Light ...

Page 13: ...is required during heating operation the unit must be evacuated and charge weighed in per the marking on the rating plate For the cooling operation the recommended subcooling is typically around 10 F This may vary greatly based on each unique system 1 Set the system running in the cooling mode by setting the thermo stat at least 6 F below the room temperature 2 Operate the system for a minimum of ...

Page 14: ...r to prevent the migration of refrigerant to the compressor during the OFF cycle The heater is energized only when the unit is not running If the main switch is disconnected for long peri ods of shut down do not attempt to start the unit until 8 hours after the switch has been connected This will allow sufficient time for all liquid refrigerant to be driven out of the compressor The installer shou...

Page 15: ...361819 YIM A 0208 Unitary Products Group 15 SECTION X WIRING DIAGRAM FIGURE 14 Wiring Diagram ...

Page 16: ...ct to change without notice Printed in U S A 361819 YIM A 0208 Copyright by Unitary Products Group 2008 All rights reserved Supersedes 128596 YIM A 0505 Unitary 5005 Norman Product York OK Group Drive 73069 ...

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