WAT E R - S O U R C E H E AT P U M P S
JRC-Series
R e v. : D e c e m b e r 8 , 2 0 2 1
I n s t a l l a t i o n , O p e r a t i o n , M a i n t e n a n c e
16
Water Quality Standard
pH - Chilled Water
0
.
7
F
°
5
8
<
to 9.0
7.0 to 9.0
7.0 to 9.0
7.0 to 9.0
pH - Heated Water
0
.
8
F
°
5
8
>
to 10.0
8.0 to 10.0
8.0 to 10.0
8.0 to 10.0
Alkalinity
(HCO3 ) ppm - CaCO
3
equiv.
50 to 500
50 to 500
50 to 500
50 to 500
Calcium
(Ca)
ppm
<100
<100
<100
<100
Magnesium
(Mg)
ppm
<100
<100
<100
<100
Total Hardness
(CaCO3) ppm - CaCO3 equiv.
30 to 150
150 to 450
150 to 450
150 to 450
Langelier Satura
�
on Index LSI
-0.5 to +0.5
-0.5 to +0.5
-0.5 to +0.5
-0.5 to +0.5
Ryznar Stability
5
.
6
I
S
R
x
e
d
n
I
to 8.0
6.5 to 8.0
6.5 to 8.0
6.5 to 8.0
Total Dissolved Solids
(TDS)
ppm - CaCO
3
equiv.
<1000
<1000
<1000
<1500
Sulfate
(SO
4
2-
) ppm
<200
<200
<200
<200
Nitrate
(NO
3
-
)
0
0
1
<
0
0
1
<
0
0
1
<
0
0
1
<
m
p
p
Chlorine (free)
(Cl)
ppm
<0.5
<0.5
<0.5
<0.5
Chloride (water < 80°F)
ppm
<20
<20
<150
<150
Chloride (water > 120°F)
ppm
<20
<20
<125
<125
Hydrogen Sul
fi
de
α
(H
2
S)
5
.
0
<
5
.
0
<
5
.
0
<
5
.
0
<
b
p
p
Carbon Dioxide
(CO
2
)
ppm
0
<50
10 to 50
10 to 50
Iron Oxide
(Fe)
ppm
<1.0
<1.0
<1.0
<0.2
Manganese
(Mn)
ppm
< 0.4
<0.4
<0.4
<0.4
Ammonia
(NH
3
)
ppm
<0.05
<0.1
<0.1
<0.1
Chloramine
(NH
2
CL) ppm
0
0
0
0
Iron
0
0
0
0
L
m
/
sl
l
e
c
a
ir
e
t
c
a
B
Slime Forming
0
0
0
0
L
m
/
sl
l
e
c
a
ir
e
t
c
a
B
Sulfate reducing
0
0
0
0
L
m
/
sl
l
e
c
a
ir
e
t
c
a
b
Suspended Solids
β
0
1
<
0
1
<
0
1
<
0
1
<
m
p
p
)
S
S
T
(
Earth Ground Resistance
χ
0
s
m
h
O
Consult NEC & local electrical codes for grounding requirements
Electrolysis Voltage
δ
0
0
3
<
V
m
Measure voltage internal water loop to HP ground
Leakage Current
δ
5
1
<
A
m
Measure current in water loop pipe
Building Primary Electrical Ground to unit, must meet local diameter and penetra
�
on length requirements
WATER QUALITY STANDARDS
For Closed-Loop and Open-Loop Systems
All Heat Exchanger
Types
COAXIAL HX Copper
Tube in Tube
COAXIAL HX
Cupronickel
Brazed Plate HX
316 SS
Symbol
Units
Desc
rip�on
El
ec
tr
ol
ys
is
Al
l H
X
ty
pe
s
Scali
ng
P
ot
en
�
al
Co
rr
os
io
n
Pr
eve
n
�
on
(Cl
-
)
Fo
uli
ng
&
Biolo
gi
cal
Do not connect heat pump to steel pipe unless dissimilar materials are separated by using Di-electric unions. Galvanic corrosion of heat
pump water pipe will occur.
Heat Exchanger Type
Closed Loop
Recirc
ula�ng
Open Loop, Tower, Ground Source Well
-
Table 2: Water Quality Standards
Clean water is essential to the performance and life span of water source heat pumps. Contaminants, chemicals, and
minerals all have the potential to cause damage to the water heat heat exchanger if not treated properly. All closed water
loop systems should undergo water quality testing and be maintained to the water quality standards listed in this table.
