Johnson Controls York VCH 20A, Technical Information

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39
Installation
As all components are factory-fitted, at the job site it is nec-
essary to merely connect the 3-way valve intake and output
to the how water line.
Turn main power supply to the unit off. See Figs. 1, 2, 3, 4
and wiring diagram for coil connection details.
Commissioning
1. Remove the access panel to the 3-way valve, side panel
motor side.
2. The water intake and outlet connections are carried out
from the front (remove the valve actuator [ref. 2] for weld-
ing and reinstall afterwards.
Attention:
It is recommendable to install manual valves
on the intake and outlet lines, so as to be able to isolate
the unit from the general installation if necessary.
3. Hot water coil control board.
The control board, the water intake probe and the air
impulse probe are factory-installed. The wiring of the
valve actuator has also been completed as per the wiring
diagram.
When installing at the job site, connect the telephone
cable between the hot water coil accessory board (J15
or J16) and the YKlon board or the board of the second
compressor located in the outdoor unit (VCH).
Also connect the 24 VAC power supply hose supplied.
Attention: It is recommendable to install the impulse
probe (B16) in the impulse duct at one meter from the
indoor unit (VIR), for improved display and readout.
Once the water intake and outlet connections are com-
pleted, turn the power supply to the machine on.
Make sure the green LED (V1) on the coil control board
(A6) is flashing (accessory board configured).
Should this not be the case, carry out a search and con-
figuration of accessories by pressing the test button on
the Yklon board (A1) for over three seconds, until the red
LED goes on. Once this search and configuration proc-
ess begins, the red LED goes on and stays on until this
operation is completed. Once it goes off, make sure the
green LED (V1) on the coil board is flashing to indicate
the accessory has been configured.
4. Check valve actuator operation.
A potentiometer, P1, on the coil control board allows
modulating the 3-way valve manually to check its opera-
tion.
The actuator will go back to its operating position after 30
seconds.
5. Jumper S2 (ENTALP) selection
By defect, factory-set to open, selects the priority of the
compressors in heat pump models. If closed, selects
operating priority of the hot water coil over the compres-
sors. Adequate for installations with very economical hot
water.
6. Water pump operation relay output.
The control board has a relay (K1) that, through connector
J14, gives output to a volt-free contact for the operation
of an installation water pump.
VIR Unit Hot water coil control board
Fig.1
Fig.2
Led Status Indication
V1 Off Board is not connected
V1 On Board is not in service
V1 Flashing Normal operation
V2 On Favourable condition
V2
Flashing Antifreeze protection
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