Johnson Controls YVAHP0721CW Series, Service Manual

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Ɣ When installing the power lines, do not apply tension to the cables. Secure the suspended cables at
regular intervals, but not too tightly.
Ɣ Make sure that the terminals do not come into contact with the surface of the electrical box. If the terminals
are too close to the surface, it may lead to failures at the terminal connection.
Ɣ Turn OFF and disconnect the unit from the power source when handling the service connector. Do not
open the service cover or access panel to the indoor or outdoor units without turning OFF the main
power supply.
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Otherwise, water leakage or electrical breakdown may result. Disconnect the power source completely
before attempting any maintenance for electrical parts. Check to ensure that no residual voltage is present
after disconnecting the power source.
Ɣ Do not clean with, or pour water into, the controller as it could cause electric shock and/or damage the unit.
Do not use strong detergent such as a solvent. Clean with a soft cloth.
Ɣ Check that the ground wire is securely connected. Do not connect ground wiring to gas piping, water
piping, lighting conductor, or telephone ground wiring.
Ɣ If a circuit breaker or fuse is frequently activated, shut down the system and contact your service contractor.
3. Before Installation
,03257$17&RQ¿UPWKHQXPEHURIWKHIROORZLQJSDUWVNLWE\UHIHUHQFLQJWKHPRGHOQXPEHUSULQWHGRQWKH
package before opening. Do NOT intermix any foreign objects within this kit. Verify that no foreign objects are
present inside any kit components prior to installation.
Name of Parts
MW-NP282A2 MW-NP452A2 MW-NP692A2 MW-NP902A2
Qty. Qty. Qty. Qty.
Branch Pipe for
High/Low Pressure
Gas Line
1 1 1 1
Branch Pipe for
Liquid Line
1 1 1 1
Accessory
Insulation for
High/Low
Pressure
Gas Line
1 set 1 set 1 set 1 set
Insulation for
Liquid Line
1 set 1 set 1 set 1 set
Reducer for
High/Low
Pressure Gas
Line Connection
(For Connecting
Pipe
(Field-Supplied))
None 1 1 1
None None 1 1
None None 2 1
None None None 1
None None None 2
Reducer for
Liquid Line
Connection
(For Connecting
Pipe
(Field-Supplied))
2 1 1 1
None 2 None 1
Tape
2 2 2 2
NOTE : If any of these parts are missing, please contact your distributor. Do not discard any foam packaging as
it is used as insulation for the joint kits after pressure testing is complete.
60
INSTALLATION