Carrier 90MA/MF/MU manual Introduction

1. INTRODUCTION

The 90M series single-package cooling units (See Figure 1) are designed to provide air conditioning aboard marine vessels and in industrial applications. The 90MA units are fitted with sea water cooled condensers while the 90MF units are fitted with fresh water cooled condensers. Both units are factory charged, wired and piped. The 90MU units are similar except they are configured for use with a remote mounted condenser.

An accessory discharge plenum may be installed to provide free-blow into the conditioned space. Also, an accessory electric, hot water or steam coil heater may be installed to provide comfort heating.

(90MA/MF

ONLY)

Figure 1 Base Unit Interior Details (Typical)

2.MODEL CHART

This manual covers 90M design series two units as shown in the following model chart.

1	2	3	4	5	6	7	8	9	10	11
9	0	M	A	3	1	2	---	6	2	1

3.1Inspect Unit

Check unit against shipping order. Inspect carefully for concealed shipping damage. If shipment is damaged or

incomplete, file claim with transportation company and advise Carrier Transicold immediately.

3.2Protect Unit from Damage

To maintain warranty, protect unit against adverse weather, theft, or vandalism on job site.

3.3Provide Unit Support

Refer to Figure 2 and Table 1 through Table 2 for unit size and weight. If desired, construct a frame of I-beams or angle iron that adequately supports unit. See Figure 12.

3.4Install Accessory Heating Coil (if applicable)

Electric heaters are installed at the top of the unit. Water or steam coil must be installed through the back of the unit as described in the Installation Instructions shipped with the accessory coil.

3.5Rig and Place Unit

NOTE

Install accessories before placing unit.

a. Provide space around unit for service, filter access, and overhead clearance as indicated in Figure 2.

b. Move and store unit in upright position.

c.Use slings with spacer under base skid to prevent pan- el damage when using hoist.

d.Units as shipped are adequately dampened against vibration. If additional dampening is desired, place sponge rubber or rubber mat, between deck and base of unit or install vibration isolators.

e.Unit should be level. Unit leveling tolerance is 1/8 inch per linear foot in any direction.

3.6Install Accessory Plenum (If Supplied)

Use plenum as template to mark hole locations in top panel. Drill 5/32-in. (0.4 cm) holes in top panel at marked locations and attach plenum with screws supplied.

PRODUCT

CODE

		MODEL
MA	-	90/10 Copper Nickel
		Condenser
MF	- Copper Condenser
MU	-	Condenserless

2- R-22

3- R-134a

4- R-407C

NOMINAL COOLING

CAPACITY (R--22)

VOLTAGE

5 - 208/230-3-60

6- 460-3-60

9- 400-3-50

DESIGN

SERIES

PACKAGING

3.7Install Ventilation--Air Ductwork (If required)

Connect ventilation ducts to flanges on outside-air supply opening (See Figure 2) using a flexible connection. Attach ductwork to ship structure and insulate with fiberglass and vapor barrier to reduce sound transmission and prevent vapor condensation.

Weatherproof external ductwork, joints, and openings in accordance with applicable codes. Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.

3.8Install Return Air Ductwork (If required)

3.INSTALLATION

To install the unit, do the following:

The unit back panel is to be field cut for alternate return-air (or outdoor-air inlet) opening as indicated in Figure 2. To install ductwork:

a. Cut out the alternate return-air opening as required.

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