Manual

6
WARNING
Safety relief valve discharge piping must be piped
near oor to eliminate potential of severe burns.
Do not pipe in any area where freezing could
occur. Do not install any shut-off valves.
D. Connect system supply and return piping to boiler.
Refer to Figure 3. Also consult I=B=R Installation and
Piping Guides. Maintain minimum ½ inch clearance
from hot water piping to combustible materials.
E. Space heating and domestic water heating with the
New Yorker Link SL™ indirect water heater. Install
the New Yorker Link SL™ indirect water heater as a
separate heating zone. Refer to the New Yorker Link
SL™ Indirect Water Heater Installation, Operating and
Service Instructions for additional information.
Figure 4: Recommended Piping for Combination
Heating & Cooling (Refrigeration) Systems
A. Size gas piping. Design system to provide adequate gas
supply to boiler. Consider these factors:
1. Allowable pressure drop from point of delivery to
boiler. Maximum allowable system pressure is ½
psig. Actual point of delivery pressure may be less;
contact gas supplier for additional information.
Minimum gas valve inlet pressure is listed on rating
label.
2. Maximum gas demand. Table 2 lists boiler input
rate. Also consider existing and expected future gas
utilization equipment (i.e. water heater, cooking
equipment).
IV. Gas Piping
Table 2: Rated Input
F. If boiler is used in connection with refrigeration
systems, boiler must be installed with chilled medium
piped in parallel with the heating boiler using
appropriate valves to prevent chilled medium from
entering boiler. See Figure 4. Also consult I=B=R
Installation and Piping Guides.
G. If boiler is connected to heating coils located in
air handling units where they may be exposed to
refrigerated air, boiler piping must be equipped with
ow control valves to prevent gravity circulation of
boiler water during operation of cooling system.
H. Use a boiler bypass if the boiler is to be operated
in a system which has a large volume or excessive
radiation where low boiler water temperatures may be
encountered (i.e. converted gravity circulation system,
etc.).
Remove circulator and install pipe tee between
circulator and boiler return along with second tee in
supply piping as shown in Figure 3. Bypass should be
same size as the supply and return lines with valves
located in bypass and supply outlet as illustrated in
Figure 3 in order to regulate water ow to maintain
higher boiler water temperatures.
Set by-pass and boiler supply valves to half throttle
position to start. Operate boiler until system water
temperature reaches normal operating range.
Adjust valves to provide 180° to 200°F supply water
temperature. Opening the boiler supply valve will raise
system temperature, while opening by-pass valve will
lower system supply temperature.
I. If it is required to perform a long term pressure
test of the hydronic system, the boiler should rst be
isolated to avoid a pressure loss due to the escape of air
trapped in the boiler.
To perform a long term pressure test including the
boiler, ALL trapped air must rst be removed from the
boiler.
A loss of pressure during such a test, with no visible
water leakage, is an indication that the boiler contained
trapped air.
Boiler
Model
Number
Input Rate
[cubic feet per hour]
Gas
Connection
Size
Natural Gas LP/Propane
20 37.5 15.0 ½
30 62.0 24.8 ½
40 96.0 38.4 ½
50 130.0 52.0 ½
60 164.0 65.6 ½
70 198.0 79.2 ¾
80 232.0 92.8 ¾
90 266.0 106.4 ¾
100 299.0 119.6 ¾