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APPLICATIONS
In order to purge air in water pipes within a closed-loop system, an air vent and air
separator should be installed in to the system. Required circulation flow rates are
labeled next to each application diagram. These flow rate requirements must be
followed.
Toxic chemicals used in boiler treatments such as alcohol, glycerol and glycol groups
must not be introduced into the system if the system incorporates an open-loop
potable water system.
The 520 can be used to supply potable water and space heating and shall not be
connected to any heating system or component(s) previously used with non-potable
water where any chemicals were added to the water heating appliances.
When the system requires water for space heating at temperatures higher than
required for other uses, a means such as a mixing valve shall be installed to temper the
water for those other uses in order to reduce scald hazard potential.
Water temperature over 125 F can cause severe burns instantly or death from scalds.
Chemicals such as diluted Glycol can be used for radiant floor, Hydro/fan coil air or
Baseboard heating only. The diluted solution of glycol must contain between 25% and
55% of Glycol. Be aware that in closed-loop glycol systems, low pressure in the heat
exchanger can cause low-temperature boiling, resulting in excessive noise and damage
to the water heater. Consult with the glycol maker for specifications prior to use.
* The recirculation pump is to be controlled by:
-Dual-set aquastat (recommended w/timer)
OR
-520 Pump Control set to "Recirculation Mode"
* The recirculation pump is to provide no less
than 2 GPM and no more than 4 GPM through
each activated water heater in the system.
H o t W a t e r O u t l e t
t o F i x t u r e s
R e c i r c u l a t i o n
P u m p
WARNING-Space-Heating Applications
-Recirculation-
S
A i r
S e p a r a t o r
This is a concept drawing only.
A i r V e n t
C h e c k
V a l v e s
32
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Page
Applications
Hot
Cold
Water
Water
Gas
Inlet
Outlet
Inlet
U n i o n s
B a l l V a l v e s
G a s S u p p l y
E x p a n s i o n T a n k
C o l d w a t e r
I n l e t
Y - S t r a i n e r
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