Specifications
11
Step 2 — Mount Motormaster® V Controls and
Accessories
NOTE: Two Motormaster V controllers, 2 fuse blocks, 2 relays
and 2 pressure transducers must be added per unit (1 per refrig-
erant circuit) with the following exceptions:
• 38AH 124, 134 units and 30GTN,GTR,GUN,GUR
230-420 modular units will require 2 kits per unit
(4 controllers, 4 fuse blocks, 4 relays, and 4 pressure
transducers). Two of each item will be installed in each
of the 2 control boxes.
• 38AH044-084 single circuit and 09DK054-094 100%
circuiting units will require 2 controllers, 2 fuse blocks,
2 relays, and 2 pressure transducers. The pressure trans-
ducers from each control will be attached at the same
point on the liquid line.
• 38AH024-034, 38AKS028-044 and 09DK020-044 units
will only require one controller, fuse block, one relay
and transducer.
MOTORMASTER V CONTROLLERS, RELAYS, FUSE
BLOCKS AND FUSES — Refer to Fig. 11-16 for the proper
mounting locations. Use the 8 x
3
/
4
-in. screws provided with
kit to mount controls and fuse blocks to control box. Use 10 x
1
/
2
-in. screws to mount relays. See Table 5 for proper fuse sizes
for each kit. The 09DK020-044 units require a field-supplied,
20 x 20 x 8 NEMA 3R enclosure.
PRESSURE TRANSDUCER — Install pessure transducer(s)
in the proper location on the liquid line. See Fig. 17-22.
30GTN,GTR,GUN,GUR Units
— Mount one pressure trans-
ducer to the Schrader service valve port near each liquid line
valve as shown in Fig. 17. Identify which circuit is A and B and
retain this information for use in later steps.
38AH024-104 and 09DK020-094 and 38AKS028-044 Units
(Except Single Circuit or 100% Circuit) — See Fig. 18-20.
Install a field-supplied Schrader port and valve into the liquid
line near the liquid line valve on each circuit. Mount pressure
transducer on this valve. For 09DK020-044 dual circuit units,
install the pressure transducer on the lead circuit. If unit has
already been piped and charged, mount pressure transducer
to each circuit’s liquid line valve port using tees provided.
Identify which circuit is A and B and retain this information for
use in later steps.
NOTE: Ensure that the liquid line valve is not backseated or
the pressure transducer will not read correctly.
38AH044-084 Single Circuit, 38AH124A/B and 09DK054-
094 100% Circuiting Units — Install 2 field-supplied Schrader
ports with valves on the common liquid line near the liquid line
valve. Mount transducers to these valve ports. If unit has al-
ready been piped and charged, mount pressure transducers to
liquid-line valve port using tees provided. (See Fig. 22.)
NOTE: Ensure that the valve is not backseated or the pressure
transducer will not read correctly.
38AH124A/B and 134A/B units
— Install 2 Schrader ports
with valves on the common liquid line near the liquid line
valve for unit module A. Repeat process for unit module B. If
unit has already been piped and charged, mount pressure trans-
ducers to liquid line valve ports using tees provided.
NOTE: Ensure that the valve is not backseated or the pressure
transducer will not read correctly.
Step 3 — Make Electrical Connections
The required electrical connections for the Motormaster V
control are for incoming power, outgoing power, and control
signals. All required wires are provided in each kit. Detailed
instructions for each model are shown below:
09DK054-094 (see Fig. 23), 30GTN,GUR,GUN,GUR040-110,
230B, 245B, (refer to Fig. 24), 38AH044-104 (Except Single
Circuit) (refer to Fig. 24) (P/N 30GT-911---080,081,082)
1. Mark and then disconnect shielded power cables (FM-1
and FM-2) from fan motor contactors FC-A1 and FC-B1
(FC1 and FC2 for 09DK). Retain all fasteners for later use.
Disconnect power cable ground wires at the control box.
2. Cut ring terminals from black power wires only. Strip
back
1
/
4
inch. Do not cut off ring terminal on ground wire.
3. Attach newly stripped wires 1, 2, 3 from FM-1 to MM-A
terminals T1, T2, T3 respectively. Re-attach ground wire to
control box back wall using ground screw near Motormas-
ter V controller. Be careful not to attach wires to B– or B+.
4. Attach newly stripped wires 1, 2, 3 from FM-2 to MM-B
terminals T1, T2, T3 respectively. Re-attach ground wire
to control box wall using ground screw punch near
Motormaster V controller.
5. Install 40-in. BLK, YEL, BLU wires from fan circuit
breaker (FCB-1) (or TB1 for 09DK units only) to fuse
block MMF-A. Install 38-in. BLK, YEL, BLU wires
from MMF-A to input power terminals L1, L2, L3
respectively on MM-A.
6. Install 40-in. BLK, YEL, BLU wires from fan circuit
breaker FCB-2 (or FC-B1 [FC2] if FCB-2 is not used) to
fuse block MMF-B. Install 38-in. BLK, YEL, BLU wires
from MMF-B to input power terminals L1, L2, L3
respectively on MM-B.
7. Attach sensor cables to pressure transducers and route
cable to control box. Ensure that the cable is separated
from sharp edges. Route cable through knockouts in
bottom of control box. Seal cable to control box using
supplied varnish cloth and metal conduit connector. Wrap
varnish cloth around wires to separate wires from metal
connector. Trim lengths of cable as desired but ensure that
shield drain wire is used.
8. Attach RED, GRN, BLK wires from sensor cables to
Motormaster controls terminal block 6, 5 and 2 respec-
tively according to Fig. 1, 23 and 24. Attach shield drain
wire to control box near Motormaster control using the
original ground screw. Ensure that the pressure transducer
from refrigerant circuit A is attached to MM-A.
9. Attach VIO and the RED wires from FR-1 fan relay
terminals 5 and 9 to Motormaster control. The RED wire
connects at terminals 2, the VIO wire to the terminal listed
in Table 8. Repeat for circuit B using VIO and RED wires.
10. Attach GRA and the RED wires to FR-1 terminals 13 and
14. Attach the other ends to FC-1 terminals C1 and C2.
Repeat for circuit B using VIO and RED wires.
To avoid electric shock and personal injury open and tag all
electrical disconnects before installing or servicing unit.
Hazard of electric shock! Wait three minutes after discon-
necting incoming power before servicing drive. Capacitors
retain charge after power is removed.
To avoid damage to the small terminals on the Motor-
master V control, use care when tightening the compres-
sion terminals and use the proper size screwdriver.
DO NOT connect incoming AC power to Motormaster V
output terminals T1, T2, and T3! Severe damage to the con-
trol will result.