Yazaki WFC-SC Series User manual

WFC- SC(H)
Chiller
&
Chiller-Heater
2
Installation
WFC-SC(H)10, 20,30 & 50
Version 11-1

WFC- SC(H) Series .Installation - 1 -
Contents
Page
1. General Information
1.1 Precautions ...................................... 2
1.2 Recei ing ..................................... 2
1.3 Unit data plate ...................................... 2
2. Handling
2.1 Rigging ..................................... 3
2.2 Access clearances ..................................... 3
3. Place of Installation
3.1 Location .................................... 3
3.2 Minimum Maintenance clearances .................................... 4
3.3 Foundation .................................... 4
3.4 Placement .................................... 5
4. Piping
4.1 General .................................... 7
4.2 Chilled-hot water piping .................................... 9
4.3 Cooling water piping .................................... 10
4.4 Heat medium circuit .................................... 11
5. Electrical Wiring
5.1 Electrical system diagram 12
5.2 Electrical connection of auxiliary equipment........................... 12
5.3 Junction box electrical wiring .................................... 13
5.3.1 Location of Junction box 13
5.3.2 Inside of Junction box wiring 14
5.4 Remote switching .................................... 15
5.4.1 Location of Control box (CB) .................................... 15
5.4.2.How to wire (remote switch) .................................... 15
5.4.3 Position of RUN-REMOTE-STOP Switch 16
5.5 Condition output signal ……………………… 17
5.5.1 How to wiring ( condition output signal ) 17
6. Water Quality
6.1 General ................................... 18
6.2 Quality limits table ................................... 18
7. Ambient temperature
7.1 General ................................... 19
8 Commissioning Request
8.1 General ……………………… 19
8.2 Start-up check list ……………………… 19

WFC- SC(H) Series .Installation - 2 -
General Information.
1.1 Precautions
The chiller-heater should be installed by trained and qualified personnel who are
familiar with absorption machinery. All precautions in these instructions, on tags and
on labels attached to the chiller-heater must be strictly obser ed to ensure safety of
personnel and continuance of the warranty alidation.
Each absorption chiller-heater has been e acuated, charged with lithium bromide and
water, and tested prior to lea ing the factory. After the equipment has been installed, a
Yazaki authorized ser ice agent will check the installation and super ise the initial
commissioning of the machine.
It is important to note that the warranty applying to the Yazaki chiller-heater will
become oid if the following restrictions are not fully obser ed.
1. Do not open any ser ice al es because such action will result in loss of acuum.
2. Always handle the equipment with care and in an upright position, do not drop or
subject the machine to side impact.
3. Do not attempt to start the system without super ision from a Yazaki authorized
ser ice agent.
1.2 Recei ing
When the absorption chiller-heater is deli ered to site, inspect it for transit damage.
Should any damage ha e occurred, do not proceed with the installation until the
Yazaki distributor has been notified and instruction to continue has been obtained.
1.3 Unit Data Plate
Check that the model number, electric oltage of the chiller-heater are consistent with
the system design and ser ices a ailable at site before proceeding with installation.
All this information is displayed on the Unit Data Plate located on the front panel of
the machine.
Aroace Hot Water Energized Chiller-Heater
Technical Specifications
Model
Type
Capacity Cooling
(kW)
Outlet temperature Cooling (°C) 7.0
Flow rate (l/sec) Chilled-hot water
E aporator pressure loss (kPa)
Inlet temperature (°C) 31
Flow rate (l/sec) Cooling water
Absorber / Condenser pressure loss (kPa)
Inlet temperature (°C) 88
Outlet temperature (°C) 83
Flow rate (l/sec)
Heat medium water
Generator pressure loss (kPa)
Power supply (VAC/ Ph/ Hz) 400 /3 / 50
Electrical Consumption
IP IPX4
Serial No
Manufacturing Date
Manufacturer YAZAKI Corporation Hamamatsu Japan
Distributor

WFC- SC(H) Series .Installation - 3 -
2. Handling
2.1 Rigging
Remo e the crate and wooden base from
the absorption chiller-heater. Lift the
machine using a wire rope and eye-bolts
(eye bolts pro ided with the chiller-heater
as illustrated in figure 1). The dry weight
and o erall dimensions are detailed in
section 1 Specifications of this manual.
Care should be taken throughout to a oid
damage to panels and piping connections –
always lift in a ertical manner.
Figure 1
2.2 Access Clearances
Properly plan to ensure an accessible
route to the place of installation before
mo ing the chiller-heater. If it is not
possible to use a crane for lifting, a
fork lift truck may be utilized. In the
e ent a crane or forklift cannot be used
and the machine must be manhandled
into position, minimum dimensions for
maneu er are shown in Figure 2
figure 2.
Access Clearance Table (mm)
Dimension WFC-SC10
WFC-SH10
WFC-SC20
WFC-SH20
WFC-SC30
WFC-SH30 WFC-SC50
A 2,365 2,490 2,565
B 1,600 1,905 2,235 2,145
C 1,600 1,905 2,235 2,420
D 1,600 1,905 2,235 2,420
3. Place of Installation
3.1 Location
The Yazaki absorption chiller-heater units ha e a weatherproof cabinet suitable for
indoor or outdoor installation. Select the location for the chiller-heater with due
consideration to the position and proximity of the cooling tower, and air handling
equipment. Particular attention must be paid to accessing the absorption machine for

WFC- SC(H) Series .Installation - 4 -
ser ice, the Yazaki chiller-heater will not perform correctly on a continuous basis
without proper maintenance. Furthermore, always a oid placing the cooling tower at a
lower le el than the chiller-heater. Such designs in ariably lead to problems with
maintaining pumping stability.
3.2 Minimum Maintenance Clearances
The minimum space and
clearance requirements
shown in figure 3 must be
pro ided around each
chiller-heater unit to
facilitate installation,
commissioning and
procedures in maintenance.
The clearances shown in the
table below apply to the CH-
K 30 through to the CH-
K100 machines. If the
system is a multi-module
configuration where chiller-
heaters will be placed side-
by-side, the clearances
recommended must still
apply. If the recommended
ser ice clearances cannot be
pro ided as indicated, the
chiller-heater should not be
installed.
Figure 3
Table of Clearances
Installation Area Maintenance Clearances
Model
WFC-SC(H)
A B
Front
C
Back
D
Left side
E
Right side
F
10
3,575 2,885 1,000 1,000 700 700
20
3,540 2,860 1,000 1,000 700 700
30
3,780 3,180 1,000 1,000 700 700
50
4,060 3,185 1,000 1,000 700 700
3.3 Foundation
Mount the absorption chiller-heater on a le el foundation constructed of non-
combustible materials, capable of supporting the operating weight of the machinery.
This particularly applies to roofs, if that is where installation is contemplated.
Be sure the roof is able to support the chiller-heater, cooling tower, pumps and
associated piping (refer Section 1 Specifications for details). It is additionally
important that, if the equipment is to be placed on the roof of a building, it should be
located in a well drained area and at least two meters from the edge. A suitable

WFC- SC(H) Series .Installation - 5 -
platform or walkway should be built such that the chiller-heater, cooling tower and
electrical apparatus can be safely and con eniently ser iced.
If the chiller-heater is to
be placed outdoors at
soil le el, a proper
concrete base, with
dimensions indicated in
figure 3 and constructed
following the example of figure 4, is necessary. All aspects of foundation and support
computations must be in accordance with local codes. Should the foundation pro e
inadequate, the chiller-heater, o er time, will tilt causing the proper distribution of
working fluids internal to the machine to be impaired; poor cooling performance will
result.
3.4 Placement
< For SC(H)10 ,20, 30 >
When the chiller-heater is finally
positioned on its foundation, be sure
that the mounting bolts are properly
located in the slots of the supporting
plates (figure 5).
A lifting bar must be used to lift the machine sufficient to insert packing shims under
the supporting plates as shown in figure 6.
F o u n d a t i o n r o c k
C o n c r e te
M o r t a r
L e v e l s u r fa c e
Figure 4
Figure 5
Slide each skim in as far as
possible making sure it locates
the mounting bolt.
Rotate each skim so that they fit
uniformly under the fixing plate
of the chiller/heater.
Hydraulic jack
with claws
Le eled by mounting bolt
Figure

WFC- SC(H) Series .Installation - 6 -
< For SC50 >
Fix the chiller with fixing plate and
anchor bolt.
The fixing plate and the anchor
bolts are deli ered as chiller
accessory（Refer fig７）
Lift the chiller with a hydraulic jack
and le el the chiller with the
le eling bolt. Base plate to be under
the le eling bolt. (Refer fig8）
< Common >
A spirit le el must be used to monitor le el as shims are inserted. Le el reference bars
are pro ided on the upper essel portion of the chiller-heater. The spirit le el must be
placed on these as indicated in figure 9.
to obtain longitudinal and trans erse
le el. Should the installation comprise
more than one chiller-heater located side-
by side, it is important that all machines
be indi idually le el and le el with
respect to each other. It is of further
importance that all machines are le eled
before any piping connections are
attempted
Figure 9
Figure 7
Insert Base plate
Le eled by adjusting bolt
Hydraulic jack
with claws
Figure 8
Adjust the chiller le el to be within 2/1000 front/back and side to side horizontal.
M20 Bolt & washer
(Standard accessory)
Washer
( rovided by the customer)
Fixing plate
(Standard accessory)
Adjusting bolt
(Standard accessory)
Base plate
(Standard accessory)
Concrete Foundation
WFC

WFC- SC(H) Series .Installation - 7 -
4. Piping
4.1 General
After le eling the chiller-heater and cooling tower, the chilled-hot water piping,
cooling water piping and heat medium piping can be installed. All pipes must be
installed and connected to the machine ensuring that complete access for ser ice is
pro ided and that all panels, including the top panel, of the chiller-heater can be easily
remo ed. Failure to obser e this ital requirement will lead to se ere compromise in
commissioning the machine and in future attempts to ser ice the machine.
Adequately support and brace the piping independently of the chiller-heater to a oid
strain on the piping connections. Do not secure electrical conduit to any part of the
machine. Pro ide thermometer wells at each inlet and outlet relati ely close to the
machine for measurement of water temperatures during commissioning and
maintenance procedures. All piping should be properly aligned and graded to a drain
al e to permit complete drainage of the system. Properly located air ents should be
pro ided so that the system can be con eniently filled with water.
It is particularly emphasized that access with large pieces of ser ice equipment to the
rear of the machine will be required during the life of the chiller-heater. Accordingly,
it is recommended that the cooling water and chilled-hot water piping to each
machine should be by means of droppers or risers from o erhead manifold pipe runs.
Insulation pro iding a proper apor barrier is recommended on all pipe work, al es
and pumps transporting the chilled water. If the chiller-heater is installed outdoors,
cladding of the insulation must be pro ided to combat weathering and the effects of
UV.
Before making final connections to the chiller-heater, the piping must be flushed with
clean water to remo e debris. Figure 8 illustrates a typical system design.

WFC- SC(H) Series .Installation - 8 -
*1.Except absorption machine (chain line) must be supplied externally by others.
*2.The strainer should install upstream of the pump to protect pumps from contamination.
*3.The 3 way al e should be installed where the heat medium pump is under separate control.
*4 and *5. Pressure drop adjust by manual al e and pressure gauge, the pressure drop will not
to change by 3 way al e opening.
*6.Use in case of repairing the components (pumps etc.) or drain the water in winter time etc.
*7.Do not exceed 588 kPa in the water & heat medium circuit!
Figure 10 Typical piping system diagram
WFC
-
SC20 ,SH20
WFC-SC30 ,SH30
WFC-SC50
WFC
-
SC10 ,SH10
Cooling Tower
Air vent
Air vent
Drain
Chilled water
Heat medium
for
Chemical
washing
Drain
Air vent
for
Chemical
washing
Drain
Water
supply
Cooling water
Cooling Tower
Air vent
Air vent
Drain
Chilled water
Heat medium
for
Chemical
washing
Drain
Air vent
for
Chemical
washing
Water
supply
Cooling water
Symbol art name Symbol art name
Thermometer Well ressure Gauge ( 0-1.5 M a )
Circulation ump 3 way valve
Flexible Joint Strainer
Manual Valve Check Valve
*1
*1
*2
*2
*3
*3
*4
*4
*5
*6
*6
*6
*5
*6
Typical piping system diagram

WFC- SC(H) Series .Installation - 9 -
4.2 Chilled-Hot Water Piping
Water supply and accommodation of expansion of the chilled water circuit is afforded
by either an open cistern or closed expansion tank with check/pressure reducing
al es as shown in figure 11.
Plan piping with a rising grade of 1/200. And where high points exist in the piping
circuit, install purge al es to expel trapped air.
Val e & Thermometer Wells
C h il l er
H e a te r
Ch il l er-
H e a te r
C h illed -h o t
w a t e r p u m p
Fan c o il Fan c o il
E xp a n s io n
ta n k
Closed System
Open System
W a ter s u p p ly C i st e r n
1 0 00 m m M inim u m
W a ter s u p p ly
C h ec k/ re du ci n g
v a lv e
Re lie f
va lve
C h illed -h o t
w a t e r p u m p
Chiller-
Heater
Chilled-hot water pump
Drain valve
Stop
valve
Balance
valve
Thermometer
wells Manual vent valve
Caution
Do not exceed
588.4kPa in the
chilled-hot
water circuit
Caution
Do not install any valves in the expansion pipeline
Figure 11
Figure 12

WFC- SC(H) Series .Installation - 10 -
A balance al e should be installed in the chilled-hot water outlet and a stop al e
should be installed in the chilled-hot water inlet. Both al es along with thermometer
wells should be placed in close proximity to the chiller-heater, refer figure 12.
After thoroughly testing for leaks, insulate the piping circuit ensuring an adequate
apor barrier is obtained. Be sure the insulation allows proper access to all
thermometer wells and hand al es. Be also sure that the chiller-heater panels are not
restricted by the insulation.
If the equipment is installed outdoors and subject to freezing ambient conditions, trace
heating of the pipes under the insulation may be considered. If glycol solutions are
contemplated, it is important that inhibitors are in solution to protect copper tubes
internal to the machine. It is further most important to understand that cooling
capacity of the chiller-heater will be degraded as concentrations of the glycol
solutions increase – it must be noted that there is limited flow rate increase allowance
for the chilled- hot water circuit.
4.3 Cooling Water Piping
Cooling water to the absorption chiller-heater is required at a temperature of 31°C or
less during cooling operation. It is also imperati e that cooling water less than 24°C
should not be supplied to the chiller-heater for prolonged periods.(longer than 30
minutes). If such contingency is likely to occur, a mixing al e facility must be
installed as illustrated in figure 13.
It is also of particular importance to obser e that the cooling flows in a parallel
fashion through the WFC-SHC20 & SCH30 machines – dissimilar to the WFC-
SCH10 which flows in parallel. Attention must be paid to the instruction label on the
machine with respect to the sizing of the transfer pipe on the cooling water inlet.
Where er possible, install the cooling tower at the same le el or higher than the
chiller-heater. If it is not possible, gi e careful consideration to the pre ention of
drain-back and loss of
cooling water due to
o erflow at the tower.
Such matters should
ha e been gi en prior
consideration by the
design engineer along
with proper facility to
pre ent damage to the
cooling tower fill
media as a result of
daily, frequent mode
change-o er of the
chiller-heater.
F
Figure 13
Chiller-
Heater
Cooling
Tower
Mixing valve
Check valve Cooling water
pump
Drain valves

WFC- SC(H) Series .Installation - 11 -
A balance al e should be installed in the cooling water inlet and a stop al e
installed in the cooling water outlet. Both al es should be placed in close proximity
to the chiller-heater along with thermometer wells for temperature measurement.
Additionally, drain (flush) al es should be installed between the balance/stop al es
and the machine to allow chemical washing of the absorber-condenser coils (see
figure 14)
If it is indicated that none of
the aforementioned matters
ha e been adequately catered
for, the authorized Yazaki
distributor should be contacted
for ad ice. Do not ignore these
contingencies; operating the
machine without proper
safeguards for both the cooling
tower and the chiller-heater
will oid the chiller-heater
warranty.
4.4 Heat Medium Piping
The heat medium pipe work will most likely be a closed system. Accordingly, since
temperature of the heat medium may operate as high as 95°C, with a standard inlet
88°C, care should be taken with the expansion de ice. All considerations with respect
to hand al es in the other water circuits also apply to the heat medium circuit.
Depending on the type of system used to source the hot water to operate the chiller-
heater, a di erting al e in the heat medium circuit may be required. Should the
decision be made to use a three way al e, the approach to control outlined in the
following electrical circuit should be adopted.
Chiller-
Heater
Cooling water
pump
Balance valve
Thermometer wells
Stop
valve
Flush
valve
Flush valve
Valves & Thermometer Wells
Caution
If the cooling water circuit
is a closed
system, Do not
exceed 588.4kPa
Figure
14
Caution
Do not exceed 588.4kPa in the heat medium circuit of the absorption
chiller-heater

WFC- SC(H) Series .Installation - 12 -
5. Electrical Wiring.
5.1. Electrical system diagram
Figure 5-1-1 illustrates a typical electrical system diagram. Refer following section
for wiring details.
5.2. Electrical connection of auxiliary equipment
All connection according to figure 5-2-1 must be supplied externally by others.
.
Note 1. All conductors must be from copper material.
Note 2. All circuits except power supply are low oltage.
Note 3. All wiring must comply with local and national electrical code and regulation.
Note 4. Cooling water switch (CTS) in sump of cooling tower use switch with maximum contact
rating of 24VAC ,1.2VA(60VA).
Note 5. The symbols shown in Figure 5-2-1 as P,CP,P3A,CM1,3,4,5,6,CM2 are connect to
terminals located in Junction box (section 5-3.).
Note 6.The 3 way al e control can be used in situations where the heat medium pump (P3) is
under separate control
LTM1 is limit switch of 3 way al e.
MC1
R
24VAC
cooling water
pump
chilled water
pump
cooling tower
fan
heat medium
pump
Note.4
Connect to Junction Box
(Note.5)
In case of using
3 way valve ( Note.6 )
CTS
( 3A )
RT1
CM1
3
3way
valve
RT1
THR1
SW1
RT2
THR2
C
SW2
RTF
THRF
SWF
RT3
THR3
3A
SW3
( RT3 )
LMT1
SWV
RTV
Do not exceed 24VAC,60VA
MC3
MCF
MC2
4
5
6
CM2
RT2 RTF RT3 R
1 2
CTF
3
1
L1
L2
L3
E
EEE E
U1
V1
W1
U2
V2
W2
UF
VF
WF
U3
V3
W3
THR1
MC1
T HR2
MC2
THRF
MCF
THR3
MC3
Note.6
Figure 5-2-1 (Typical connection )
M
Chilled Hot
Water Pump
Cooling
Water Pump
Cooling Tower Fan
Absorption Machine
Control Board
Vacuum Pump
Cooling water
Switch
Electrical source
AC400V 3ph 50Hz
Electrical source
AC230V 50Hz 1ph
Over current
breaker
Emergency Switch
Status signal
Remote operation &
C/H mode Changeover
ump & Fan interlock
Junction box
Internal
Control Box
ump control
Figure 5-1-1
*1.Exept absorption machine (chain line) must be supplied externally by others.
*2.AC 230V 50Hz 1ph. power consent is required for maintenance (vacuum pump operation).
*3.The 3 way valve control can be used in situations where the heat medium pump ( 3) is under
separate control.
*4. Emergency switch ( ower shut down switch) must be installed to Control Board.
AC400V 3ph 50Hz
*1
*3 *4
Heat Medium
Pump
*2
Heat Medium
3 way Valve
For Heat Medium Control

WFC- SC(H) Series .Installation - 13 -
5-3. Junction box electrical wiring
5.3.1 Location of Junction box
Junction box is located left bottom of the Chiller (refer to figure 5-3-1a.)
<WFC-SC (H) 10, 20, 30 >
<WFC-SC50>
Junction box is located rear bottom of the Chiller (refer to figure 5-3-1b.)
Figure 5-3-1b (SC50)
Junction box
Junction box
Figure 5-3-1a (SC (H) 10, 20 and 30)

WFC- SC(H) Series .Installation - 14 -
5.3.2. Inside of Junction box wiring
In the Junction box there is a noise filter and some connecting terminals as
figure 5-3-2.
Note1. All conductors must be from copper material.
Note2. All wiring must comply with local and national electrical code and regulation.
Terminal marking Description
L1, L2, L3, E 400VAC 3phase 50Hz primary power supply
E Ground line
Output control signal to chilling/heating water pump
C Output control signal to cooling water pump
3A Output control signal to heat medium pump (normal open)
3B Output control signal to heat medium pump (normal close) (Option)
CTF Output control signal to cooling tower fan (Option)
CM1 Output signal common circuit
1 Not Use
2 Not Use
3 Error signal from chilling/heating water pump
4 Error signal from cooling water pump
5 Error signal from cooling tower fan
6 Error signal from heat medium pump
7 Not Use
8 Not Use
CM2 Error signals common circuit
S3, S4 Requirement heat medium output signal (Option)
１２３４
５６７８COM2S３S４
Noise filter
power supply terminal
Error signal input terminal
Control signal output terminal
Extra control signal output terminal
connecting terminal
・
Connect the conductor by adjusting the
symbol (3,4,5,6,CM2) with figure 5-2-1 .
・
These are input terminal to the chiller.
・
Attention!
You must not give any voltage on to
these terminals.
・
Connect the conductor by adjusting the
symbol ( ,C , 3A,CM1) with figure 5-2-1 .
・
These are output terminal from the chiller .
・
Attention!
Do not exceed 24VAC, 60VA as shown in Figure 5-2-1.
・
Connect the 400VAC 3phase 50Hz power
supply. Connect the ground conductor to E.
・
Circuit breaker and over -current protection
must be supplied externally by others.
Figure 5-3-2
P CP
P3A P3B
CTF
CM1
L1 L2 L3

WFC- SC(H) Series .Installation - 15 -
5.4. Remote switching
If remote operation is required, make the connection according to the following
procedure.
5.4.1. Location of Control box (CB)
The CB is located behind the front panel as figure 5-4-1 (The sample figure is WFC-
SC30)
5.4.2. How to wire (remote switch)
Connect the dry contact signal according to Figure 5-4-2.
Take off the 2 screw to
open the cover
Take off the front panel
CB
Figure 5-4-1
Control panel
Attention!
You must not give any voltage on to
these terminals
Inside of CB
Figure 5-4-2 ( typical connection )
Terminal marking Description
A
Not used
B
Not used
C
Input signal for absorption machine operate
D
Input signal for absorption machine
s
top
E
Input signal common circuit
F
Not used
G
Not used
H
Not used
I
Not used

WFC- SC(H) Series .Installation - 16 -
5.4.3. Position of RUN-REMOTE-STOP Switch
Adjust the "Run-Remote-Stop switch" to the position of the Remote.
RUN-REMOTE-STOP Switch
Figure 5-4-3 (Control Panel )

WFC- SC(H) Series .Installation - 17 -
5.5. Condition output signal
If absorption machine operation signal and absorption machine alarm signal is
required, make the connection according to the following procedure.
5.5.1. How to wiring (condition output signal)
Connect the output signal according to Figure 5-5-1.
Inside of CB
Figure 5-5-1 (typical connection )
L
1
L
2
L
3 U V W
TR1 TR3 TR14 TR5 TR6 TR7 TR8 15 16 17 18 S14 S13 S12 S11 TR9 TR10 TR11 TR12 TR13 S1 S2 S5 S6 S8 S9 S10
R1
24VAC
L1
L2
R2
R1
R2
GL
RL
Terminal marking
Description
S1,S2 Not used
S5,S6 Not used
S7,S8 Not used
S9,S10 Not used
S11,S12
Output signal of absorption machine operate
S13,S14
Output signal of absorption machine alarm stop
15,16 Not used
17,18 Not used
Equipments for display the
output signals (i.e. relay, lamp
etc.) are supply by others.
Do not exceed
24VAC, 60VA

WFC- SC(H) Series .Installation - 18 -
6 Water Quality
6.1 General
Water used in the chilled-hot water circuit and cooling water circuit may cause
corrosion if not properly analyzed and treated to maintain a passi e condition. The
cooling water circuit is particularly ulnerable since in most cases, this is an open
circuit thus lending itself to scaling from precipitation of dissol ed solids, and to
growth of algae and micro-organisms in the water. All ha e a detrimental effect on
the function of rejecting heat. If left unchecked, moreo er, performance of the chiller-
heater will be affected and a significant reduction in life expectancy could result. It is
equally important to consider that extreme health hazards may attend badly
maintained cooling towers
Correct and continuous water treatment is thus essential to the correct operation of the
chiller-heater. Failure to pro ide and maintain in operation the necessary apparatus for
water treatment will immediately oid the warranty applying to the absorption
machine.
6.2 Water Quality Limits
The following table describes the maximum limits of water contaminates within the
circuits of the chiller-heater. Make-up water, exhibiting total dissol ed solids no
greater than 50ppm, with substantial “bleed-off”, would be necessary to achie e this
result in the cooling water circuit.
If such water quality in supply is not a ailable under all circumstances, chemical
treatment is required to combat scaling. Chemicals to combat algae and micro-
organisms are in any e ent necessary. It is highly recommended that water treatment
specialists be retained prior to the initial commissioning of the plant and to pro ide an
ongoing program of chemicals and periodic inspections to ensure that the cooling
water circuit remains safe and compatible throughout.
Water Quality Reference Table
ITEM CHILLED/
HOT WATER
HEAT
MEDIUM
COOLING
WATER
MAKE UP
WATER
pH (at 25 °C) 6.8-8.0 7.0-8.0 6.5 – 8.2 6.8 – 8.0
Conducti ity (µS/cm at 25°C) 400 300 800 300
Chloride ion (Cl
-
ppm) 50 30 200 50
Sulfate ion (SO
4
2
-
ppm) 50 30 200 50
Acid consumption (CaCO
3
ppm) 50 50 100 50
Total hardness (CaCO
3
ppm) 70 70 200 70
Calcium hardness (CaCO
3
ppm) 50 50 150 50
Standard
Ionic silica (SiO
2
ppm) 30 30 50 30
Total iron (Fe ppm) 1.0 1.0 1.0 0.3
Copper (Cu ppm) 1.0 1.0 0.3 0.1
Sulfide ion (S
2
-
ppm) N.D. N.D. N.D. N.D.
Ammonium ion (NH
4
+
ppm) 1.0 0.1 1.0 0.1
Residual chlorine (Cl ppm) 0.3 0.1 0.3 0.3
Free carbon dioxide (CO
2
ppm) 4.0 0.4 4.0 4.0
Reference
Ryzner stability index - - 6.0 - 7.0 -
N.D. (Not Detectable)
Caution
Operating the chiller-heater in cooling mode without cooling water treatment
equipment installed, applied with chemicals and operating correctly will void
the warranty

WFC- SC(H) Series .Installation - 19 -
7 Ambient temperature
7.1 Winter Shutdown
If only heating mode of operation is required from the chiller-heater during the winter
months, drain the cooling tower and associated water circuit including the
absorber/condenser. This is particularly important if freezing conditions are likely to
occur due to low ambient temperatures. Should ambient temperatures exist where
freezing is common at the place of installation, a measure of protection of the chilled-
hot water circuit may also be afforded by the addition of a glycol solution. Howe er,
glycol must not remain in the chilled-hot water circuit if cooling operation is required.
8. Commissioning Request.
8.1 General
After the absorption chiller-heater has been installed, piped, flushed, leak tested and
electrically wired as described in these instructions, and in full compliance with all
pertinent safety codes, the Yazaki authorized distributor must be contacted to arrange
super ision of the initial test-run and plant commissioning. It is essential that
personnel representing all trade disciplines in ol ed in the installation be on site on
the day of start-up to cater for any final adjustment and alterations necessary to allow
the chiller-heater and the system generally to function correctly.
8.2 Start-up Check List
The list abo e should be copied. The copy moreo er, should be completed and
forwarded to the Yazaki authorized distributor prior to the request for commissioning.
It is expected that any irregularities in the status of the plant will be corrected at the
time the list is checked. Complete one copy of the Check List for each Yazaki chiller-
heater.