Watts T55-85MHP40 - Manual (Page 14)

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Outputs 170 MDC series
Determining Output for Dual Head Dual
Control Models
• The dial ring for adjustable pumps is marked
L-10; L=5%, 1-10 indicates 10% increments of
maximum output.
• The turndown ratio is 20:1.
• On the MDC models, the outer pump head
operates on a percentage of the inner head
(closest to the motor).
• Setting #10 on both pump heads will deliver the
pump’s maximum output and is the only time each
pump head will output the same amount.
Example Using 170MDCHP34
• Decide on the desired output for the inner head.
• Note the setting on the dial ring that represents the
desired output.
For example setting #8 = 80% of max output
In the 170MDCHP34 model, setting
#8 = 13.6 GPD
• Repeat the above steps to calculate the output of the
outer head.
Using setting #6 in this example,
#6 = 60% of the inner head output
13.6 GPD x 60% = 8.5 GPD
In this example using pump model 170MDCHP34, the
output for the inner head would be 13.6 GPD and
8.5 GPD for the outer head.