11
Remove the circulator and install a pipe tee between
the circulator and boiler return along with a second tee
in the supply piping as shown in Figure 7. The bypass
should be the same size as the supply and return lines
with valves located in the bypass and supply outlet as
illustrated in Figure 7 in order to regulate water flow
to maintain higher boiler water temperatures.
Set the by-pass and boiler supply valves to a half throttle
position to start. Operate boiler until the system water
temperature is at a normal operating range.
Adjust the valves to provide 180° to 200°F supply
water temperature. Opening the boiler supply valve
will raise the system temperature, while opening the
by-pass valve will lower the system supply temperature.
6. 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 8. Also consult
I=B=R ,"Residential Hydronic Heating Installation
and Design Guide".
7. 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
flow control valves to prevent gravity circulation of
boiler water during the operation of the cooling system.
IMPORTANT
8. A hot water boiler installed above radiation level must
be provided with a low water cutoff device as part of
the installation.
If a low water cut-off is required, it must be mounted
in the system piping above the boiler. The minimum
Figure 8: Recommended Piping for Combination
Heating & Cooling (Refrigeration) System
III: INSTALLATION INSTRUCTIONS (continued)
safe water level of a hot water boiler is just above the
highest water containing cavity of the boiler; that is, a
hot water boiler must be full of water to operate safely.
Refer to Appendix "A" at the rear of this manual.
9. If it is required to perform a long term pressure test of
the hydronic system, the boiler should first 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 first be removed from
the boiler.
WARNING
Assure that there is not air left inside boiler
when checking for leaks. DO NOT test for leaks
with pressurized air.
A loss of pressure during such a test, with no visible
water leakage, is an indication that the boiler contained
trapped air.
H.
CONNECT TANKLESS HEATER PIPING AS
SHOWN IN
Figure 9. See Table 2 for Tankless Heater
Ratings.
THE FOLLOWING GUIDELINES SHOULD BE FOLLOWED
WHEN PIPING THE TANKLESS HEATER:
1. FLOW REGULATION - If low through the heater is
greater than its rating, the supply of adequate hot water
may not be able to keep up with the demand. For this
reason a flow regulator matching the heater rating
should be installed in the cold water line to the heater.
The flow regulator should preferably be located below
the inlet to the heater and a minimum of 3' away from
the inlet so that the regulator is not subjected to excess
temperatures that may occur during "off" periods when
it is possible for heat to be conducted back through the
Figure 7: Recommended Bypass Piping
for V1 RO/FO
