Lochinvar 399 - Manual (Page 37)

Installation and
Service Manual
37
Radiant Floor and Snow Melt
Heating Systems
This type of heating boiler application operates in a low
temperature range which requires a boiler bypass as described
under Low Temperature Return Water Systems. A non-metallic
rubber or plastic tubing installed in a radiant (in floor) system
must have an oxygen barrier to prevent oxygen from entering
the system through the walls of the installed tubing. Excessive
oxygen absorption into the system will result in an accelerated
rate of corrosion causing a sludge buildup. This excessive
corrosion will also damage the boiler and system components.
Sludge formed as the result of excessive oxygen in the system
can restrict water flow resulting in a premature boiler failure.
Any boiler damage due to excessive oxygenation is non-
warrantable.
ΔT ΔT ΔT ΔT
10ºF 20ºF 30ºF 40ºF
Input Output GPM FT. HD GPM FT.HD GPM FT.HD GPM FT.HD
399,999 339,999 68 7.4 34 2.4 23 1.1 17 0.6
500,000 425,000 -- -- 42 4.1 28 1.6 21 0.7
650,000 617,500 -- -- 55 5.2 37 3.0 28 1.6
750,000 712,500 -- -- 63* 7.2 42 4.1 32 2.3
990,000 841,500 -- -- 83 5.4 55 2.6 42 1.5
1,260,000 1,071,000 -- -- 107* 13 71 4.4 53 2.7
1,440,000 1,224,000 -- -- -- -- 81 6.3 61 3.8
1,800,000 1,530,000 -- -- -- -- 102* 11.8 76 6.6
2,070,000 1,759,500 -- -- - -- -- -- -- 87 9.0
*Requires Cupro-Nickel heat exchanger.
TABLE-P
System Temperature Rise Chart Based on Btu/hr Input
*
ƽ
CAUTION: The maximum flow rate for models 399,999 - 750,000 Btu/hr is 55 GPM and 90 GPM on
models 990,000 - 2,070,000 Btu/hr. Do not exceed the maximum flow rate of the heating boiler.
If higher flow rates are required through the boiler, an optional Cupro-Nickel heat exchanger is available.
When using a Cupro-Nickel heat exchanger, GPM can be increased by 30 percent. Consult the factory
for specific application requirements.