York EX Series, Installation, Operation & Maintenance Instructions Manual

Page: 125 / 176

JOHNSON CONTROLS
125
SECTION 6 – OPERATION
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
6
2. Press the Simultaneous ON button on the Setting
screen. See Figure 42 on page 114 .
3. Press the RHW only operation OFF button on the
Setting screen.
4. Set each Cooling or Heating changeover valve
and manual valve to the desired operation mode
(“Simultaneous cooling and residential hot water
supply” mode or “Simultaneous heating and resi-
dential hot water supply” mode). See Table 25 on
page 112 .
Changeover to Residential Hot Water Sole
Supply Mode (Option)
In this mode, residential hot water is supplied through
the auxiliary heat exchanger (option), No chilled/hot
water is supplied through the evaporator.
1. Choose how to treat the cooling water in the ab-
sorber and condenser tubes during the residential
hot water supply operation period. See Storage
Method of the Cooling Water During Heating Op-
eration Period on page 157
for more informa-
tion and instructions.
2. Choose how to treat the chilled/hot water in the
evaporator tubes during the residential hot water
supply operation period. See Storage Method of
the Cooling Water During Heating Operation Pe-
riod on page 157
for more information and in-
structions.
3. Verify the following two manual valves are open:
a. on the weak solution line from the low-tem-
perature heat exchanger to the solution flow
control float valve in the high-temperature
generator.
b. on the strong solution line from the high-
temperature heat exchanger to the solution
spray pump.
4. Press and hold the Forced Dilution
ON
button on
the Setting screen for 10 seconds. See Figure 42
on page 114 .
5. The solution pump and refrigerant pump then start
independently.
The chilled/hot water pump should be op-
erating during forced dilution to prevent
freezing of the chilled/hot water.
6. Open the refrigerant manual blow valve. For the
location of the refrigerant manual blow valve, see
Figure 51 on page 131 , Figure 52 on page 132 ,
or Figure 53 on page 133 . The refrigerant in the
evaporator is diverted into the absorber.
7. Observe the liquid level at the lower part of the
evaporator through the level gauge (G102).
8. Immediately after the refrigerant liquid level ap-
pears in the level gauge (G102), close the refriger-
ant manual blow valve (turn it to the right until it
stops).
9. Press the Refrigerant Pump Stop button on the
Setting screen. See Figure 42 on page 114 .
10. The refrigerant pump stops. Run the solution
pump independently for 10 minutes.
11. Press the Forced Dilution OFF button on the Set-
ting screen. See
Figure 42 on page 114
. The so-
lution pump stops.
12. Press the Refrigerant Pump
Auto
button on the
Setting screen. See Figure 42 on page 114 .
13. Keep this condition for 30 minutes. The solution
liquid level in the high-temperature generator
gradually rises.
14. After the solution liquid level in the high-temper-
ature generator shows full, close the two manual
valves:
a. on the weak solution line from the low-tem-
perature heat exchanger to the solution flow
control float valve in the high-temperature
generator
b. on the strong solution line from the high-
temperature heat exchanger to the solution
spray pump.
15. Set each Cooling or Heating changeover valve
and manual valve to Residential hot water supply
mode. See Table 25 on page 112 .
16. Press and hold the Operation Mode Heating but-
ton for 15 seconds. The button is located on the
Setting screen. See Figure 42 on page 114 .
17. Press the RHW only operation ON button on the
Setting screen.