Specifications

ClimateMaster Water-Source Heating and Cooling Systems
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Tranquility Vertical Stack (TRM) Series
Rev.: 05/23/07D
TRM
46
Riser GPM Sizing
Riser GPM requirements and individual Unit GPM requirements are necessary to select the proper Riser
Piping diameters. Refer to this page to determine GPM requirement, then refer to Riser Diameter Sizing Table
to determine Riser Piping diameters.
Example is for bottom supply - bottom return system feed loop. GPM's are dependent upon unit load and
system loop water temperatures. Please refer to Performance Charts for individual Unit GPM requirements.
Unit GPM (UGPM) = Required gallon per minute from "Performance
Charts," in "Vertical Stacked Design Guide."
Total Riser GPM (TRGPM) = The sum of, all Units, GPM on each Riser.
Total GPM Per Floor (TGF) = Total GPM minus the sum of Unit GPM
from all fl oors below. TGF = TRGPM - (sum UGPM from units below).
Example: Four fl oors, Consisting of units sizes TRM09 and TRM12, as
shown in diagram. GPM's are 2.0 and 3.0 respectively.
TRGPM = 2.0 + 3.0 + 3.0 + 2.0 = 10 GPM.
Floor 4: TGF = 10 - (3.0 + 3.0 + 2.0) = 2 GPM needed at fl oor 4.
Floor 3: TGF = 10 - (3.0 + 2.0) = 5 GPM needed at fl oor 3.
Floor 2: TGF = 10 - (2.0) = 8 GPM needed at fl oor 2.
Floor 1: TGF = 10 - (no fl oors below) = 10 GPM needed at fl oor 1.
Refer to Riser Diameter Sizing page.
Floor 4
TRM09
2.0 GPM
Floor 3
TRM12
3.0 GPM
Floor 2
TRM12
3.0 GPM
Floor 1
TRM09
2.0 GPM