MANUAL RESET HI-LIMIT
(1)
: Locate in supply piping
downstream of connection of the last module.
LOW WATER CUTOFF
(1)
: (Electronic type or float type)
Locate in supply header. Follow manufacturer’s installa-
tion instructions. If heating plant is to be installed above
level of radiation, a low water cut-off must be installed to
protect plant from dry fire.
CAUTION: To prevent accidental dry fire, do not
install isolation valves between low water cutoff and
the module.
CAUTION: Do not install any low water cut-off in a
location where water will not freely drain away from
the float or probe (i.e., in a pipe tree or loop) should
a low water condition develop in the module.
For electronic probes, vertical installation (where all
water can freely drain away from probe) is preferred over
horizontal. Do not install in small diameter pipe nipples or
bushings, as insufficient clearance to probe may result in
corrosion and/or erroneous readings.
SYSTEM PUMP
(1)
Locate in the heating plant supply pip-
ing, downstream of the modules. Follow manufacturer's
installation instructions.
CAUTION: HEATING PLANTS MUST NOT BE USED
WITHOUT FORCED SYSTEM CIRCULATION, AS
OVERHEATING/FAILURE OF CAST IRON SECTIONS
MAY RESULT.
MOTORIZED VALVE: Commonly used on combination
space/volume water heating systems to ensure a priority
for domestic hot water over space heating. Use a 2"
globe valve with motor for MC2 heat exchanger and a 2-
2/2" butterfly valve with motor and linkage for MC-3 & 4
heat exchangers. See Figure 3.5 for location and follow
manufacturer’s instructions.
FLOW CHECK VALVE (Optional): Important to control
direction of flow and prevent gravity circulation. Locate
where it cannot cause isolation of any particular loop or
zone from the main system. Follow manufacturer’s instal-
lation instructions.
MAKE-UP WATER METER (Optional): Will help deter-
mine total system water volume for purposes of water
treatment, and aid in the identification of a system leak.
Follow manufacturer’s installation instructions.
STRAINER (Optional): For retrofit or steam conversion
systems, basket-type strainer will trap loose system
scale. Locate in return water line. Follow manufacturer’s
installation instructions.
BACKFLOW PREVENTER (Optional): Used as a
means of isolation (space heating system from main
water supply) to safeguard against potential hazard of fill
valve connection allowing migration of water treatment
chemicals into potable water supply. Follow manufactur-
er’s installation instructions.
OTHER COMPONENTS: Install all other waterside com-
ponents such as shut-off valves, mixing valves, ther-
mometers and supply water temperature sensors; install
sensors or probes in a location that will sense supply
water temperature from all modules. Follow manufactur-
er's installation instructions.
8
STEP 4: HYDRONIC COMPONENTS (CONTINUED)
(1) For heating plants providing volume water heating only (instantaneous recovery or with storage tank), see Figures 3.6 and
3.7 on page 10 for installation guidelines
STEP 5: HYDROTESTING THE SYSTEM
It is recommended that hydrotesting of the entire heating
system be performed before installing jackets and con-
trols or wiring the system.
fill the entire system with
water. The assembled boiler shall be subjected to a
hydrostatic test pressure not less than 1-1/2 times the
maximum allowable working pressure. The required
test shall not exceed the test pressure by more than PSI.
All fittings and components should then be inspected for
visible signs of leakage. If no pressure drop is detected
for a two-hour period while the system is under pressure,
the heating system may be considered water tight.
Summary of Contents for MultiTemp MR Series
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