Raypak 0133-4001 WH Manuel D’Utilisation
20
The table above provides data for selecting in-line pumps for use in a Uni-Temp 80 system for a single heater
and tank according to the following:
and tank according to the following:
1. Flow rates are based on water hardness as measured in grains per gallon.
Soft: 0-4 grains per gallon.
Medium: 5-15 grains per gallon.
Hard: 16 and over grains per gallon.
Medium: 5-15 grains per gallon.
Hard: 16 and over grains per gallon.
2. Maximum Flow Rates:
133
22 GPM
181-401
45 GPM
514-1826
90 GPM
2100-4001
200 GPM
3. Pressure drop values ( P and SHL) and minimum pipe sizes are for two-pass heaters.
4. Sizing based on heater and tank being placed 5 feet apart. The equivalent length of pipe
valves and fittings in the system is as follows:
valves and fittings in the system is as follows:
1-1/2" NPT = 70 Ft (181-401)
2-1/2" NPT = 80 Ft (926-1826)
2" NPT = 75 Ft (514-824)
3" NPT = 85 Ft (2100-4001)
Additional pipe fittings will increase the system head loss.
5. Select a pump based on the water hardness, flow, and system head loss.
6. If heater is more than two stories above the tank, consult the factory.
NOTE:
GPM flow rates are limited by maximum acceptable velocity through heat exchanger tubes. Heater models 514
through 1826 may be provided with an integral rear-mounted pump. This must be specified at time of order. The
integral pump will provide sufficient flow to meet the conditions listed in the table.
GPM flow rates are limited by maximum acceptable velocity through heat exchanger tubes. Heater models 514
through 1826 may be provided with an integral rear-mounted pump. This must be specified at time of order. The
integral pump will provide sufficient flow to meet the conditions listed in the table.
PIPING - DOMESTIC HOT WATER SUPPLY HEATERS
GENERAL SPECIFICATIONS
UNI-TEMP 80 HOT WATER SUPPLY SYSTEMS
T = Temperature Rise, Degree F@GPM FLOW
GPM = Gallons per Minute Flow
P = Pressure Drop, Foot thru Heat Exchanger
GPM = Gallons per Minute Flow
P = Pressure Drop, Foot thru Heat Exchanger
MPS = Minimum Pipe Size, NPT
SHL = System Head Loss
SHL = System Head Loss