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AMR Integrated Water Heaters (Supplement to GF-146)
CHAPTER 5: INSTALLATION – PIPING
CAUTION!
Undersized expansion tanks will cause system water to be lost
through the pressure relief valve and cause additional makeup
water to be added to the system. Eventual boiler failure can result
due to this excessive makeup water addition, compromising the
functionality of the unit.
Refer to the expansion tank manufacturer instructions for additional installation details. Connect
the expansion tank to an air separator only if the air separator is located on the suction side
(inlet) of the system circulator. Always locate and install the system fill connection at the same
location as the expansion tank connection to the system
4.5 Recirculator Heating Pump Sizing and Installation
This water heater must be fitted with a circulator pump for domestic potable hot water.
4.5.1 Recirculator Pump Sizing
The water resistance to size the recirculator pump to supply flow through the heating system at
the AMR Integral unit’s connections is shown in graph form in Figure 4-2.
It is up to the installer to ensure the minimum system flow is not less than 4 GPM at any time.
If the flow is lower, the unit automatically stops the burner.
Figure 4-2: AMR Integrated Series Water Side Head Pressure Loss Graph
4.5.2 Recirculation Pump Selection
Table 4-1 shows a selection of recirculation pumps available from AERCO specified for each
model and for use with normal and hard water supplies.
Table 4-1: Recommended AMR Integrated Recirculation Pumps
HEATER MODEL
NORMAL WATER
(UP TO 16 GRAIN/GAL)
HARD WATER
(OVER 16 GRAIN/GAL)
AERCO P/N
AERCO P/N
199R
69261
69263
250R
69261
69263
399R
69262
69265
500R
69262
69265
Ft. H
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OMM-0106_0A
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
21
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GF-146-IR
Ph.: 800-526-0288
PRI - 07/22/15