Raypak 88AR-398A, Инструкция по установке и эксплуатации

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26
VERSA
MASTER
Fig. 22: XPak FT Cascade System Wiring
Fig. 23: FT_BUS Wire Connection
2. To enable this remote control function, set dip
switch 5 to the UP position on the PIM. Dip switch
5 Toggles between an EMS (UP) signal or a
demand signal from the VERSA (DOWN). Dip
switch 2 on the PIM toggles between a Direct
Drive (UP) input and a Target Temperature
(DOWN) setpoint.
3. For a 4-20 mA application, refer to the VERSA IC
Applications Guide.
4. Connect an Energy Management system or other
auxiliary control signal to the terminals marked 0-
10V (+ /-) on the PIM (see Fig. 20). Caution should
be used to ensure that the +0-10V connection
does not create a short to ground.
Wiring the Cascade System
Communication Bus
1. Designate the primary boiler as the master
boiler/boiler1 by leaving DIP switch 2 on the
VERSA in the ON position. All other VERSA con-
trols require DIP switch 2 to be toggled OFF,
designating them as followers. Follower VERSA’s
are ignored by their corresponding PIM’s. Use
standard 18 AWG wire to connect the master
VERSA to the PIM on the followers. A total of 3 fol-
lowers can be connected to the VERSA on the
master. For systems requiring more than 4 con-
nected boilers, an external sequencer such as the
Raypak Temp-Tracker Mod+ Hybrid can be used.
2. It is recommended that the shortest length cable
possible be used to reach between the boilers. Do
not run unprotected cables across the floor or
where they will become wet or damaged. Do not
run communication cables parallel with, or close to
or against, high voltage (120 volt or greater)
wiring. Raypak recommends that the total maxi-
mum length of each set of communication bus
cables not exceed 200 feet.
3. Route the FT_BUS wires from the front along the
right rail and out the bottom of the cabinets.
4. Connect the FT_BUS wires to the PIM by pressing
down on the slots with a small screwdriver and
then inserting the wires into the holes. See Fig.
23.