User manual Burnham Hydronics MMII

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IV. Domestic Hot Water Performance and Piping  
®
A. Domestic hot water ratings for the Minuteman II are  
based two 5 minute draws with 10 minute recovery  
period at 100°F average temperature rise. Refer to  
Table 1 for ratings.  
Table 1: Domestic Hot Water Ratings  
BOILER  
MODEL  
WATERDRAW PRESSURE DROP  
(GPM)  
(PSI)  
MMII4-70  
MMII4-105  
MMII5-105  
MMII5-140  
2.9  
3.1  
3.1  
3.3  
14  
16  
16  
18  
Figure 7: Domestic Hot Water Piping  
B. Drain domestic water system.  
1
2
. Shut off cold water supply at main shutoff valve.  
. Open 1 or more system faucets to relieve pressure.  
Open system drain valve, leaving faucets open to  
relieve vacuum.  
NOTICE  
Domestic water temperature has the  
potential to exceed the desired temperature  
during a space heating cycle.  
3
. Disconnect exiting domestic hot water heating  
system ( if applicable).  
C. Connect hot water piping to ½" NPT outlet of heater.  
See Figure 7.  
E. Fill domestic hot water system.  
WARNING  
1
. Open all faucets to allow air to purge from heater  
and piping.  
Installanautomaticmixingvalve(tempering  
valve)atthetanklessheateroutlettoavoidrisk  
ofburnsorscaldingduetoexcessivelyhot  
wateratfixtures. Adjustandmaintainthe  
mixingvalveinaccordancewiththe  
2
3
. Open domestic hot water shutoff valve (if used).  
. Open cold water inlet shutoff valve.  
manufacturer'sinstructions.  
4. Purge air from domestic water system. Close  
faucets.  
D. Connect cold water piping to ½" NPT inlet of heater.  
See Figure 7.  
5
. Check system for leaks. Repair as necessary.  
8

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