Install Instructions

19
4. Connect Field Wiring
a. Connect the eld wiring to the pressure limit,
the LWCO and the burner or primary control.
If equipped with tankless heater, connect eld
wiring from the Aquastat Control to the Oil
Primary Control "TT" terminals. Make the
wiring connections as shown in Figure 23.
Note:
• The GeniSys 7505 Oil Primary Control has
pre-installed "T-T" jumper. To activate "T-T"
terminals, "T-T" jumper must be removed.
• DO NOT remove "T-T" jumper unless wiring
diagram indicates a direct connection from
thermostat and/or tankless heater aquastat
control to the oil burner primary control's "T-T"
terminal. Refer to Figure 23.
I. CONNECT SUPPLY AND RETURN PIPING TO
HEATING SYSTEM.
1. Clearances — Steam and hot water pipes shall
have clearances of at least ½” from all combustible
construction.
2. Water Boiler
a. For Forced Circulation HOT WATER HEATING.
See Figures 12A and 12B. Consult I=B=R,
"Residential Hydronic Heating Installation and
Design Guide".
b. Use a boiler water bypass if the boiler is to be
operated in a system which has a large volume
or excessive radiation where low boiler water
temperature may be encountered (i.e. converted
gravity circulation system, etc.).
Install a pipe tee in the boiler return piping along
with a second tee in the supply piping as shown
in Figures 12A and 12B. The bypass should
be the same size as the supply and return lines.
Locate valves in the bypass and supply outlet as
illustrated in Figures 12A and 12B for regulation
of water ow to maintain higher boiler water
temperature.
Set the by-pass and boiler supply valves to a half
throttle position to start. Operate boiler until the
system water temperature is a normal operating
range.
Adjust the valves to provide 180° to 200°F
supply water temperature. Opening the boiler
supply valves will raise the system temperature,
while opening the bypass valve will lower the
system supply temperature.
c. If this boiler is connected to heating coils located
in air handling units where they may be exposed
to refrigerated air the boiler piping must be
equipped with ow control valves to prevent
gravity circulation of boiler water during the
operation of the cooling system.
d. If this boiler is used in connection with
refrigeration systems, the boiler must be installed
so that the chilled medium is piped in parallel
with the heating boiler using appropriate valves
to prevent the chilled medium from entering
the boiler, see Figure 14. Also, consult I=B=R,
"Residential Hydronic Heating Installation and
Design Guide".
NOTICE
Before using copper for steam piping, consider the following characteristics of copper piping:
1) High coefcient of thermal expansion can induce mechanical stresses and cause expansion/contraction
noises if not accounted for in the piping system design and installation,
2) High heat transfer rate (heat loss) of un-insulated copper piping must be included in the normal piping
and pickup factors used to size the boiler,
3) Soldering or brazing pastes and uxes that end up in the system can cause poor heat transfer, surging,
an unsteady water line and wet steam if not thoroughly removed during boil out procedure and,
4) Galvanic corrosion of the adjoining metal may occur due to dissimilar metals in certain water chemistries
if dielectric unions are not used.
III: INSTALLATION INSTRUCTIONS (continued)
Figure 14: Recommended Piping for Combination
Heating & Cooling (Refrigeration) Systems