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15

Water system 
balancing

A complete knowledge of the 
hydronic system, including its 
components and controls, is 
essential to proper water system 
balancing and should only be 
completed by a qualified expert. The 
system must be complete, and all 
components must be in operating 
condition before beginning the water 
system balancing procedures.

Each hydronic system has different 
operating conditions depending on 
the devices and controls installed for 
the particular application. The actual 
balancing technique may vary from 
one system to another.

After the proper system operation 
is established, the appropriate 
operating conditions such as 
water temperatures, flow rates and 
pressure drops should be recorded 
for future reference.

Before and during water system 
balancing, conditions may exist due 
to incorrect system pressures which 
may result in noticeable water noise 
or undesired valve operation. After 
the entire system is balanced, these 
conditions will not exist on properly 
designed systems. If any of these 
conditions persist, recheck the 
system for air that may not have been 
properly vented during start-up.

Water treatment

Proper water treatment is 
a specialized industry and 
therefore it is recommended 
to consult an expert in this 
field to analyze the water for 
compliance with the water 
quality parameters listed below 
and to specify the appropriate 
water treatment program. The 
expert may recommend rust 
inhibitors, scaling preventative, 
antimicrobial growth agents or 
algae preventatives. Anti-freeze 
solutions, glycols, may also be 
used to lower the freezing point.

Water content

Required concentration

Sulphate

< 200 ppm

pH

7.0 – 8.5

Chlorides

< 200 ppm

Nitrate

< 100 ppm

Iron

< 4.5 mg/L

Ammonia

< 2.0 mg/L

Manganese

< 0.1 mg/L

Dissolved solids

< 1000 mg/L

Calcium carbonate hardness

300 – 500 ppm

Calcium carbonate alkalinity

300 – 500 ppm

Particulate quantity

< 10 ppm

Particulate size

800 micron max

All Zehnder Rittling water coils 
are constructed of copper tubes 
and brass headers. It is the end 
user’s responsibility to ensure 
that any of the water delivery 
components are compatible with 
the treated water.

Failure to provide proper water 
quality will void the fan coil unit’s 
warranty.

Water system balancing and treatment

Summary of Contents for FL

Page 1: ...i Cooling Fresh Air Clean Air Heating Rittling Cabinet Convectors Installation Operation and Maintenance ...

Page 2: ...Handling and installation 12 Hot water connections 13 Exposed unit touch up 14 Heating system 14 Water system balancing 15 Water treatment 15 Maintenance 16 Equipment start up checklist 16 Replacement parts 17 IMPORTANT Submittal documentation specific to each project supersedes the general guidelines contained within this manual ...

Page 3: ...Models Floor models Wall models FL Floor flat top SF Floor sloped top WL Wall flat top RL Wall semi recessed PL Wall fully recessed SL Wall sloped top 1 Models ...

Page 4: ...8880 9648 10416 36 12720 13080 14112 14688 11760 12144 13776 14136 40 14376 14784 15936 16584 13200 13656 14856 16008 48 17664 18096 19560 20376 16320 16776 17760 19656 52 19248 19752 21336 22224 17712 18192 19752 21336 60 22512 23112 24960 26040 20736 21288 23112 24960 64 24216 24888 26832 28008 22392 22992 24960 26928 Table 2 Steam ratings in BTU H 215 F at 65 F E A T Depth in Length in Front ou...

Page 5: ...tandard element Inlet opening L H 1 3 8 Floor flat top Standard dimensions Nominal heights H 18 20 26 32 Nominal lengths L 24 28 36 40 48 52 60 64 Nominal depths D 4 6 8 Any combination of length height and depth is available Contact factory on heights less than 20 for access door location 3 Dimensions and data ...

Page 6: ...rille Standard element Inlet opening L 1 8 H 1 3 8 Floor sloped top Standard dimensions Nominal heights H 18 20 26 32 Nominal lengths L 24 28 36 40 48 52 60 64 Nominal depths D 4 6 8 Any combination of length height and depth is available Contact factory on heights less than 20 for access door location 4 ...

Page 7: ...in L Wall flat top Standard dimensions Nominal heights H 18 20 26 32 Nominal lengths L 24 28 36 40 48 52 60 64 Nominal depths D 4 6 8 Any combination of length height and depth is available Contact factory on heights less than 20 for access door location 5 Dimensions and data Dimensions and data ...

Page 8: ... Standard element Inlet opening L 3 L H 3 1 3 8 Wall semi recessed Standard dimensions Nominal heights H 14 18 20 24 26 32 Nominal lengths L 20 24 28 32 36 40 44 48 52 56 60 64 Nominal depths D 4 6 8 Any combination of length height and depth is available Contact factory on heights less than 20 for access door location 6 ...

Page 9: ...ts Outlet grille L 1 8 H 1 3 8 Wall sloped top Standard dimensions Nominal heights H 18 20 26 32 Nominal lengths L 24 28 36 40 48 52 60 64 Nominal depths D 4 6 8 Any combination of length height and depth is available Contact factory on heights less than 20 for access door location 7 Dimensions and data ...

Page 10: ...ement Inlet opening L 3 L H 3 1 3 8 Wall fully recessed Standard dimensions Nominal heights H 18 20 26 32 Nominal lengths L 24 28 36 40 48 52 60 64 Nominal depths D 4 6 8 Recessed depths R 3 3 4 5 3 4 7 5 8 Any combination of length height and depth is available Contact factory on heights less than 20 for access door location 8 ...

Page 11: ...red during unloading must be reported to the shipping company within 15 days of receipt of the shipment All units are shipped F O B factory Therefore Zehnder Rittling is not responsible for damage during transit It is the responsibility of the installing contractor to inspect and verify that the units shipped were in fact the correct model number voltage etc Any discrepancies should be reported to...

Page 12: ...icable codes Only trained and qualified service personnel using good judgment and safe practices should install repair and or service air conditioning equipment Untrained personnel can perform basic maintenance functions such as cleaning coils All other operations should be performed by trained service personnel When working on air conditioning equipment observe precautions in the literature tags ...

Page 13: ...diately reported to the carrier and a claim should be filed In the event a claim for shipping damage is filed the unit cardboard container and all packing must be kept for physical inspection by the freight carrier Once the equipment is properly positioned on the job site cover the units with either a shipping carton vinyl film or an equivalent protective covering Cap open ends of piping that is s...

Page 14: ...o provide proper pitch down from the supply end if the convector is being used in a two pipe steam system Upon installation make sure that all sweated connections have been flushed with system water to avoid corrosion from left over flux material Once the coil is connected into the heating system a standard pressure leak test should be conducted as specified by the engineer After completion of the...

Page 15: ...inting caulking etc All water coils must be protected from freezing after initial filling with water Even if the system is drained unit coils may still hold enough water to cause damage when exposed to temperatures below freezing In the event that leaking or defective components are discovered the Zehnder Rittling Sales Representative must be notified before any repairs are attempted All leaks sho...

Page 16: ...emical process between two components such as epoxies and urethanes should be avoided All standard colors including primer can be painted over If the installing contractor chooses not to paint over the primer color the factory cannot match primer color on future orders potentially causing color match issues in the field Factory touch up spray paint may require a number of light coats to isolate th...

Page 17: ...se conditions persist recheck the system for air that may not have been properly vented during start up Water treatment Proper water treatment is a specialized industry and therefore it is recommended to consult an expert in this field to analyze the water for compliance with the water quality parameters listed below and to specify the appropriate water treatment program The expert may recommend r...

Page 18: ...ughly Failure to maintain a clean coil surface will result in reduced performance Inspect for leaks Replace front cover If a damper is included ensure that the damper is able to move freely Equipment start up checklist Heating connections Connect field piping to unit Pressure test all piping for leaks Install drain lines and traps as required Insulate all piping as required Unit start up General v...

Page 19: ...id the manufacturer s warranty When ordering parts the following information should be supplied to ensure proper part identification Complete unit model number Complete part description including any identifying numbers on the part On warranty replacements it is often necessary to return the faulty component to receive credit Contact the local Sales Representative who will get authorization from t...

Page 20: ...r Rittling 100 Rittling Boulevard Buffalo NY USA 14220 T 716 827 6510 F 716 827 6523 sales zehnder rittling com www zehnder rittling com Zehnder Rittling November 2013 English subject to change without notice ...

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