Install Instructions

10
HOT
COLD
MIX
MIN M
A
X 7 1 2
A
FE
D
B B
C
A
A
HOT
COLD
MIX
MIN M
A
X 7 1 2
A
FE
D
B B
C
A
A
MIX
E
D
A
30
50
70
90
110
130
150
170
190
210
ϒF
MIX
E
D
A
30
50
70
90
110
130
150
170
190
210
ϒF
Dimensions
NPT male & Press connections
Laylength (press)
size ½ & ¾ inch: 3
5
/8 "
size 1 inch: 4
1
/8 "
Code A B C D* E F
NPT Threaded connections
521400A
1
⁄2" 2
5
⁄8" 5
1
⁄4" 6" 3
3
⁄8" 2
5
⁄8"
521400AC
1
⁄2" 2
5
⁄8" 5
1
⁄4" 6" 3
3
⁄8" 2
5
⁄8"
521410A**
1
⁄2" 2
5
⁄8" 5
1
⁄4" 7
3
⁄8" 4¾" 2
5
⁄8"
521410AC**
1
⁄2" 2
5
⁄8" 5
1
⁄4" 7
3
⁄8" 4¾" 2
5
⁄8"
521500A
3
⁄4" 2
5
⁄8" 5
1
⁄4" 6" 3
3
⁄8" 2
5
⁄8"
521500AC
3
⁄4" 3" 6" 6" 3
3
⁄8" 2
5
⁄8"
521510A**
3
⁄4" 2
5
⁄8" 5
1
⁄4" 8" 5
3
⁄8" 2
5
⁄8"
521510AC**
3
⁄4" 3" 6" 8" 5
3
⁄8" 2
5
⁄8"
521600A 1" 2
7
⁄8" 5
3
⁄4" 6
1
⁄4" 3¾" 2
5
⁄8"
521600AC 1" 3
1
⁄16" 6
1
⁄8" 6
1
⁄4" 3¾" 2
5
⁄8"
521610A** 1" 2
7
⁄8" 5
3
⁄4" 7
5
⁄8" 5
1
⁄8" 2
5
⁄8"
521610AC** 1" 3
1
⁄16" 6
1
⁄8" 7
5
⁄8" 5
1
⁄8" 2
5
⁄8"
Press connections
521406A ½" 2
9
⁄16" 5
1
⁄8" 6" 3
3
⁄8" 2
5
⁄8"
521416A** ½" 2
9
⁄16" 5
1
⁄8" 8
1
⁄4" 5
5
⁄8" 2
5
⁄8"
521506A ¾" 2
13
⁄16" 5
5
⁄8" 8½" 5
7
⁄8" 2
5
⁄8"
521506AC ¾" 4
3
⁄16" 8
3
⁄8" 6
1
⁄4" 3
5
⁄8" 2
5
⁄8"
521516A** ¾" 2
13
⁄16" 5
5
⁄8" 8½" 5
7
⁄8" 2
5
⁄8"
521516AC** ¾" 4
3
⁄16" 8
3
⁄8" 8½" 5
7
⁄8" 2
5
⁄8"
521606A 1" 2
15
⁄16" 5
7
⁄8" 6
5
⁄16" 3
11
⁄16" 2
5
⁄8"
521616A** 1" 2
15
⁄16" 5
7
⁄8" 8
5
⁄8" 6" 2
5
⁄8"
Troubleshooting
Under normal operating conditions the Caleffi 521 thermostatic mixing valve will provide a very high level of
performance. However, in some circumstances, where the following maintenance schedule is not followed
problems may arise.
Recommended maintenance schedule:
Tests should be conducted regularly to monitor the thermostatic mixing valve performance, as deterioration
of performance could indicate that the valve and/or the system require maintenance. If, during these
tests, the temperature of the mixed water has changed significantly in comparison with the previous test,
the details given in the installation and commissioning sections should be checked and maintenance
conducted.
The following should be checked regularly to ensure that the optimum performance levels of the valve are
maintained. Check every 12 months at least, or more often if necessary.
1) Check and clean the system filters.
2) Check that any check valves positioned upstream of the Caleffi thermostatic mixing valve are operating
correctly, without problems caused by impuritites.
3) Limescale can be removed from internal components of the thermostatic mixing valve by immersion in
a suitable de-scaling fluid.
4) When the components which can be maintained have been checked, commission the valve.
*At minimum temperature position
on adjusting knob.
**Model with integral outlet
temperature gauge.