Schreiber Chillers 15MEDAC email - Manual (Page 13)

NETWORK REQURIMENT:
Some chillers may be shipped with optional modem or TCP/IP connection. A phone line
and number is required for the modem, and a permanent network connection is
required for TCP/IP. Your network’s router will have to be configured so that the IP
address for the chiller is exposed outside of the facility’s LAN.
Piping Installation:
A single chilled water loops is required for the chiller.
CHILLER CON. DESIGN FLOW MIN. PIPE SIZE
HEAT XCHANGER 1-1/2” FPT 23 usgpm 1-1/2”
Only use copper or PVC (schedule 80) piping. All piping should be insulated to prevent
condensation and to minimize heat gain from the ambient air. A maximum of 30% by
volume of Ethylene Glycol can be added to the system. The glycol should be added
directly to the reservoir through the fill port. To get the proper percentage, the
reservoir volume should be added to the piping volume to get the total amount of fluid
in the system. Since both chilled water loops pull water out of the same reservoir, both
loop volumes should be calculated.
A pressurized water supply and hose should be provided at the site for filling the chilled
water reservoir. Automatic fill systems are not used because of unintended glycol
dilution.
Since the reservoir is vented to atmosphere, expansion tanks are not required in the
piping system
A float in the reservoir will send an alarm to check the water level in the reservoir,
without shutting the chiller down.
REMOTE CONDENSER PIPING
There are two circuits in this chiller; therefore four pipes are required to connect the
chiller and condenser.
Refrigeration Piping Guidelines (Based on 150ft equivalent length)
Hot Gas Line (comp-to-condenser) 7/8”
Liquid Line (condenser-to-receiver) 5/8”
These values are based on 150’ of total piping length, plus equivalent length of fittings.
Shorter runs may allow for smaller pipes, but over-sizing the Hot Gas line lowers the
gas velocity, which prevents proper oil movement through the system. This value MUST
NOT BE EXCEEDED, for any length of pipe.
Refer to the interconnecting diagram for more requirements on piping installation.