20
5 - FIELD SELECTABLE INPUTS
Jumpers and DIP (dual in-line package) switches on the control
board are used to customise unit operation and can be configured
in the field.
IMPORTANT: Jumpers and DIP switches should only be
clipped when power to control board has been turned off.
5.1 - Complete C control jumper settings (see Figs. 11
and 13)
Water coil freeze protection (FP1) limit setting - Select jumper 3
(JW3-FP1 low temp.) to choose FP1 limit of -12.2
°
C or -1.1
°
C.
To select -1.1
°
C as the limit, DO NOT clip the jumper. To select
-12.2
°
C as the limit, clip the jumper.
Alarm relay setting - Select jumper 1 (JW1) for connecting
alarm relay terminal (AL2) to 24 VAC (R) or to remain as a dry
contact (no connection). To connect AL2 to R, do not clip the
jumper. To set as dry contact, clip the jumper.
5.2 - Complete C control DIP switches
The Complete C control has 1 DIP switch block with five
switches (see Figs. 11 and 13).
Performance Monitor (PM) - DIP switch 1 will enable or disable
this feature. To enable the PM, set the switch to ON. To disable
the PM, set the switch to OFF.
Stage 2 - DIP switch 2 will enable or disable compressor delay.
Set DIP switch to OFF for stage 2 in which the compressor will
have a 3-second delay before energising.
Switches 3 and 4 - Not used.
Freeze protection (FP1) - DIP switch 5 is used to initiate 1 or 3
tries for the FP1 fault. If there is water freeze protection for the
water coil then DIP switch 5 can be set to lock out on the FP1
fault after 1 try. ON = 1 try. OFF = 3 tries.
5.3 - Deluxe D control jumper settings (see Figs. 12
and 14)
Water coil freeze protection (FP1) limit setting - Select jumper 3
(JW3-FP1 low temp.) to choose FP1 limit of -12.2
°
C or -1.1
°
C.
To select -1.1
°
C as the limit, DO NOT clip the jumper. To select
-12.2
°
C as the limit, clip the jumper.
Alarm relay setting - Select jumper 4 (JW4-AL2 dry) for con-
necting alarm relay terminal (AL2) to 24 VAC (R) or to remain
as a dry contact (no connection). To connect AL2 to R, do not
clip the jumper. To set as dry contact, clip the jumper.
Low pressure setting - The Deluxe D control can be configured
for low pressure setting (LP). Select jumper 1 (JW1-LP norm.
open) for choosing between low pressure input normally opened
or closed. To configure for normally closed operation, do not
clip the jumper. To configure for normally open operation, clip
the jumper.
CAUTION: To avoid equipment damage, DO NOT leave
system filled in a building without heat during the winter
unless anti-freeze is added to system water. Condenser coils
never fully drain by themselves and will freeze unless
winterised with anti-freeze.
9.
System water loop: Verify all air is bled from the system.
Air in the system impedes unit operation and causes
corrosion in the system piping.
10. Unit filters: To avoid system damage and to provide maxi-
mum performance, ensure the unit filter is clean.
11. Unit fans: Manually rotate fans to assure free rotation.
Ensure fans are properly secured to the fan shaft. Do not
oil fan motors on start-up since they are lubricated at the
factory.
12. System control centre: To ensure control of the temperature
set points for operation of the system’s heat rejector and
boiler, examine the system control and alarm panel for
proper installation and operation.
Table 4 - Air and water limits
Cooling
Heating
Min. ambient air temperature
10
°
C
10
°
C
Rated ambient air temperature
27
°
C
19
°
C
Max. ambient air temperature
38
°
C
30
°
C
Min. entering air temperature
10
°
C
10
°
C
Rated entering air temperature, db/wb
27/19
°
C
20
°
C
Max. entering air temperature, db/wb
38/28
°
C
27
°
C
Min. entering water temperature
-1
°
C
-6
°
C
Normal entering water temperature
30
°
C
21
°
C
Max. entering water temperature
43
°
C
32
°
C
Notes:
1.
Minimum air and water conditions can only be used at nominal flow rates.
2.
50KQE units may have up to two values at maximum or minimum with all other
parameters at normal conditions.
3.
Operating limits shown are for start-up, not continuous operation. It is assumed
that such a start-up is for the purpose of bringing the space to desired
occupancy temperature.
Table 5 - Water quality guidelines
Condition
Acceptable level
pH
7 to 9 range for copper. Cupronickel may be used in the 5 to 9
range.
Total hardness
Calcium and magnesium carbonate should not exceed 350 ppm.
Iron oxides
Less than 1 ppm.
Iron bacteria
No level allowable.
Corrosion*
Max. allowable
Coaxial
level
metal
Ammonia,
0.5 ppm
Cu
ammonium hydroxide
ammonium chloride,
0.5 ppm
Cu
ammonium nitrate
ammonium sulphate
0.5 ppm
Cu
chlorine/chlorides
0.5 ppm
CuNi
hydrogen sulphide**
None Allowable
-
Brackish
Use cupronickel heat exchanger when concentrations of calcium
or sodium chloride are greater than 125 ppm are present.
(Seawater is approximately 25,000 ppm.)
*
If the concentration of these corrosives exceeds the maximum allowable level,
then the potential for serious corrosion problems exists.
**
Sulphides in the water quickly oxidise when exposed to air, requiring that no
agitation occur as the sample is taken. Unless tested immediately at the site,
the sample will require stabilisation with a few drops of one molar zinc acetate
solution, allowing accurate sulphide determination up to 24 hours after
sampling. A low pH and high alkalinity cause system problems, even when
both values are within ranges shown. The term pH refers to the acidity,
basicity, or neutrality of the water supply. Below 7.0, the water is considered to
be acidic. Above 7.0, water is considered to be basic. Neutral water contains a
pH of 7.0.
Note: Hardness in mg/l is equivalent to ppm.
